Dirty Screen Effect Test and Per-Model Notes

Dirty Screen Effect Test - VA Panel DSE Check

Dirty screen effect is easiest to judge on a plain mid-grey field from your normal desk position. Dirty screen effect (DSE) is a gray-uniformity artifact on LCD panels where mid-grey content shows visible patches, smears, or streaks of slightly different brightness across the panel surface. It is most noticeable on large, uniform areas such as web pages on a light background, and RTINGS isolates it with a full-screen 50% grey image.¹

Running the mid-grey test for DSE

Dirty screen effect is most visible on a solid mid-grey pattern viewed from your normal seating position under normal room lighting. RTINGS treats gray uniformity as important for large, uniform content like web pages and documents, and its monitor method uses a full-screen 50% grey image to test it.¹ Use your regular working brightness, typical ambient light, and usual monitor distance for a realistic baseline.

Separating DSE from scrolling artefacts

Open the mid-grey pattern and enter full-screen mode before evaluating. View the panel straight-on and scan for patches, smears, or worm-like streaks that differ noticeably from the surrounding grey. After the static test, scroll a plain-grey or white webpage in a browser: DSE patches stay fixed to their panel position as content scrolls beneath them, which separates DSE from cable artefacts and driver problems.

If the visual anomaly disappears or shifts position when you scroll, it is almost certainly a driver, cable, or software rendering artefact rather than a panel-level DSE issue. A true DSE patch is physically fixed to the panel surface and will remain in the same relative position regardless of what content is displayed or how the window moves across the screen.

How to judge DSE from your seat

How to judge DSE from your seat

Sit at your normal desk distance and adopt your typical working posture before making any definitive judgements about whether DSE on your specific panel is severe enough to act on, because perspective dramatically influences perceived severity. A patch that only becomes visible when you lean close to the screen and deliberately scrutinise the panel surface may never affect your daily productivity or gaming experience, while a patch that stands out clearly on documents, spreadsheets, or web pages from your usual seating position can be genuinely distracting during everyday work. The controlled mid-grey test pattern gives you a repeatable baseline for comparison, but your actual real-world workload and the content you view most frequently should be the ultimate judge of acceptability.

If the result falls into a borderline grey area where you are uncertain whether to keep the unit, compare your specific observations with community reports from owners of the same model and panel size to establish a reasonable severity benchmark. A large VA panel can show mild DSE that is visible on test patterns yet remains entirely unobtrusive during normal varied-content use, but severe patching that clearly shows up during ordinary desktop tasks like document editing is worth thorough documentation with photos before the return window closes. Keep your written notes focused specifically on what you can see from your normal seat at your working distance, not on how the panel looks when you force the issue with close-up scrutiny.

DSE versus other mid-grey artefacts

On a mid-grey pattern, several different issues can look similar until you examine their behaviour. DSE produces center-focused blotchy spots; RTINGS separates DSE from broader standard deviation because it looks for high-frequency uniformity variation rather than smooth edge-to-edge dimming.² Backlight uniformity gradients, by contrast, produce smooth brightness transitions, typically brighter in the centre and darker toward the edges, rather than the irregular worm-like patches of DSE.

Distinguishing DSE from cable artefacts

Display driver artefacts and cable issues produce patterns that change with signal conditions: horizontal banding that shifts when you move a window, or noise that appears and disappears when you adjust the cable. None of these are DSE. Static irregular patches that stay fixed to the panel surface as content scrolls beneath them confirm DSE. Moving or variable patterns point to a cable, driver, or signal source problem instead.

VA panel characteristics and DSE severity

VA panels are particularly susceptible to DSE because liquid crystal cell alignment uniformity varies measurably between individual LCD panels, and larger screens are inherently more difficult to manufacture to consistent uniformity standards. RTINGS also notes that mechanical pressure from components or rough handling during manufacturing and shipping can create additional visible defects, so unit-to-unit variation is a significant practical concern when you evaluate a new monitor.²

Flat VA panels in the popular 27 to 32-inch range can show moderate DSE at typical viewing distances, but the majority of units stay within a tolerance band that does not noticeably affect everyday desktop use during normal productivity tasks. TFTCentral describes a 32-inch AMVA panel with 178/178 viewing angles, showing that VA panels in this size class are used for desktop work even though uniformity still needs to be checked on your own unit.³

How panel size shapes DSE severity

DSE is a term used to describe an LCD panel with inconsistent luminance performance across its surface area, appearing as random splotches, uniform lines, wide bars, and sometimes corner vignetting, and it stays fixed to the screen while the picture moves through it.⁴ That fixed position is also why the effect reads as a dirty screen rather than as a content problem. DSE has no manufacturer pass or fail line to compare against, so treat the grey field as a relative benchmark: run the test after the display has been on for roughly half an hour and with the screen surface cleaned, so dust and unburned-in backlight do not contaminate the result.⁵ Panel size also directly affects DSE severity in practice, because a 32-inch panel has substantially more surface area for microscopic alignment variation to accumulate across than a 24-inch panel. When evaluating your unit, run the mid-grey pattern in this DSE and bleed separation alongside the dead pixel and backlight bleed checks so you can rule out DSE and every other uniformity issue in the same session, then compare it against community reports for the same model and size. Cross-model and cross-technology comparisons set false expectations, because DSE on a large VA panel can look very different from DSE on a smaller flat panel even though both are panel-uniformity issues.

When to use this

Run this test on a solid mid-grey pattern after initial setup. DSE is most visible at 50% grey. Use it to evaluate the panel before your return window closes, and to compare the severity against your tolerance before filing a warranty claim.

Examples

Centre of the panel appears lighter or differently toned than the edges on a solid grey test

Scrolling content in a browser confirms the patch is static to the panel, not content-related

Streak or worm-shaped region visible along the right edge on a grey pattern

Pattern confirmed as static to the panel, visible at all content positions

Dell S2722DGM Monitor Test

A good Dell S2722DGM should show deep blacks, but the VA panel still needs checks for colour shift and dirty screen effect. The Dell S2722DGM is a 27" 1440p 165 Hz VA panel.¹ VA offers higher native contrast than IPS but can exhibit black smearing and colour shift at off-centre viewing angles.² Use this tool to check for dead pixels, backlight uniformity, and the degree of off-angle colour shift.

Specifications¹

VA colour shift and the off-axis viewing check

VA panels shift colour noticeably when viewed from off-axis positions, and the S2722DGM is no exception.² At normal desktop seating directly in front of the monitor, colour accuracy is competitive with IPS panels at the same price tier. Move 30 degrees off to the side, and a grey test pattern shows a visible blue or yellow tint depending on the direction. This is a physical property of the VA cell orientation and cannot be calibrated away through OSD settings.

Checking colour shift from your desk

To assess how much this shift affects your specific setup, sit at your normal seating position and run the solid grey uniformity pattern first. Then move deliberately 30 degrees to the side and observe the tint shift. For a desk where the monitor is always viewed straight-on, this characteristic rarely intrudes during normal use. For a setup where you view the monitor from an angle frequently, evaluate the shift at your actual working angle before accepting the unit.

If the tint shift is barely noticeable at your normal seating distance but becomes apparent only when you lean in or view from an extreme angle, the panel is behaving within normal VA tolerances for this price tier. A shift that remains clearly visible at your regular working position without deliberate off-axis viewing is more concerning and worth documenting for a potential return before the retailer's window closes.

How to separate panel behaviour from setup issues

Setup variables and genuine panel characteristics can produce remarkably similar visual artefacts during testing, and confusing the two is one of the most common reasons for unnecessary monitor returns that could have been avoided with a more systematic diagnostic approach. The S2722DGM makes this overlap especially tricky because its 165 Hz mode is only reachable over DisplayPort, so a mistaken HDMI connection silently limits the panel to 144 Hz and changes how motion and overdrive artefacts appear. ### How to separate panel behaviour from setup issues

Before deciding whether a result is serious enough to act on, systematically remove the setup variables that commonly distort monitor tests and create false impressions of panel quality. Confirm the monitor is connected by DisplayPort rather than HDMI, the Windows refresh rate matches the model specification, and any HDR or colour-management layer is disabled unless you are intentionally testing HDR behaviour. A wrong input path or mismatched refresh rate can make motion handling, uniformity, and brightness distribution look significantly worse than the panel itself would produce under correct conditions.

After correcting those variables, repeat the specific pattern that first caught your attention and compare the before-and-after results carefully. If the patch, smear, or colour shift remains visible from your normal seating position after the setup is corrected, the issue is more likely to matter in everyday use and worth documenting thoroughly for a return. If the anomaly disappears entirely after correcting the setup, keep the corrected settings as your new baseline and discard the earlier result as a configuration artefact rather than a genuine panel defect that would affect your daily experience.

High native contrast verification and DSE check

The 3000:1 native contrast ratio is one of the S2722DGM's primary advantages over IPS alternatives in the same price range.³ To verify this, open the full black test pattern in a darkened room after turning off all ambient lighting. The VA black level should appear noticeably deeper than a nearby IPS monitor at the same room brightness, with far less corner glow; that depth confirms the 3000:1 contrast ratio is genuine and not a backlight or manufacturing compromise.

Dirty screen effect on flat VA

After verifying black level, switch to the mid-grey uniformity pattern to check for dirty screen effect.⁴ The S2722DGM is a flat VA panel, so evaluate DSE as a general uniformity issue rather than a curvature-driven band. View the grey pattern straight-on and scan for patches or streaks that differ from the surrounding grey level. Minor variation near the centre is expected on VA. Pronounced patching visible without deliberate scrutiny warrants evaluation against your tolerance before the retailer return window closes.

Dead pixel sweep and contrast ratio confirmation on the S2722DGM

With the VA colour shift and DSE both assessed, run the dead pixel sweep across all six solid colour patterns in this contrast and pixel verification tool before your return window closes. Spend 30 seconds on each. The S2722DGM's 3000:1 native contrast makes stuck bright pixels highly visible on the black test.³ Any constant-colour dot on the black field that does not appear at the same position on the red, green, and blue patterns is a stuck pixel rather than content artefact.⁵ Dead pixels appear as dark dots against the white and colour patterns. Document any defect before the return window closes so you can compare it against the warranty policy that applies to your purchase.

After the pixel sweep, confirm the panel's contrast advantage by comparing the full black test pattern against the full white test pattern. The transition from a black field to a white field on the S2722DGM should look striking: a 3000:1 native contrast VA produces a noticeably deeper black than an IPS panel in the same room under the same conditions. If the black field appears grey or shows significant corner glow, confirm the OSD brightness is not set above 80% and that local dimming is not actively misconfigured. Verify 165 Hz is active in Windows Advanced Display Settings after completing the quality check. Dell lists 165 Hz over DisplayPort and 144 Hz over HDMI for this model, so use DisplayPort when checking the full refresh rate.

Final refresh rate and input verification on the S2722DGM

Verify 165 Hz is active in Windows Advanced Display Settings after completing the quality check. Dell lists 165 Hz over DisplayPort and 144 Hz over HDMI for this model, so use DisplayPort when you need the full refresh rate for competitive play. If the refresh rate readout shows 144 Hz or 60 Hz on a DisplayPort connection, open the Dell OSD and confirm the input source is set to DisplayPort rather than HDMI, because the panel accepts either cable but only DisplayPort unlocks the maximum 165 Hz mode that gives the S2722DGM its competitive motion clarity advantage.

Samsung Odyssey G3 27" Monitor Test

Judge the Samsung Odyssey G3 27" from your normal seating distance, because mild VA DSE can look worse when you inspect it up close. The Samsung Odyssey G3 27" is a flat VA gaming monitor in the LS27AG320 family, with a 1920×1080 panel and a maximum 165 Hz refresh rate. VA technology gives this model a stronger native contrast baseline than many IPS panels, so the black test is especially useful for judging uniformity and stuck bright pixels. Use the mid-grey uniformity pattern to check for panel variation, then run the full pixel sweep before deciding whether the unit is within your tolerance.

Specifications¹

Diagnosing DSE severity on the Odyssey G3 27"

The Samsung Odyssey G3 27" uses a flat VA panel at 1080p resolution, which means dirty screen effect is the primary uniformity concern to evaluate before drawing conclusions about how the panel will look during everyday scrolling content. Open the mid-grey uniformity pattern and view the screen straight-on from your normal seating distance under the room lighting you normally use rather than in a darkened room that exaggerates minor brightness variations. ### Checking DSE from your normal seat

EIZO's monitor test methodology includes a dedicated Uniformity pattern specifically designed to check how evenly a display reproduces image information across the full screen surface, and comparing your result against the published expectations for that monitor category provides an objective severity benchmark.² Patches that remain fixed to the panel while scrolling content moves beneath them are consistent with DSE or panel-local uniformity variation. Moving or variable patterns that follow the content usually point to a different underlying issue, such as GPU scaling, signal interference, or refresh-rate behaviour.

How to judge DSE at normal viewing distance

How to judge DSE at normal viewing distance

Judging DSE by how it behaves on real content

DSE is a use-case result, not just a test-pattern result. Sit at the distance you normally use the monitor and view the mid-grey pattern before leaning in. A faint patch that only appears during close inspection may be tolerable for gaming, while a patch visible on documents or web pages is more likely to bother you every day. The relevant threshold is what you can see without forcing the issue.

If the patch stays fixed while scrolling content, it is panel-local. If it moves with content or changes when you adjust the cable, it is not DSE. Keep notes on the pattern, room lighting, and whether the patch is visible on grey only or also on ordinary desktop content. Those details make the result easier to act on before the return window closes.

Off-axis colour shift and contrast verification

After the uniformity check, use the viewing-angle pattern to confirm whether colour or brightness changes at your actual seating position. VA panels can look different from the side than IPS panels, so the important question is whether the shift matters for your desk setup. Move your head side to side while watching the pattern, and note the angle at which the image starts to wash out or shift hue, because that off-axis threshold determines whether the panel suits a multi-monitor or shared-desk arrangement.

Checking black level and contrast ratio

Next, run the full black test in a dark room to evaluate the VA contrast behaviour. The Odyssey G3 is specified with a 3000:1 typical contrast ratio, so stuck bright pixels should stand out clearly against the black field during the check.¹ Finish with the dead pixel sweep across all six solid colour patterns, because a constant-colour dot on the black field that does not appear at the same position on the green and blue patterns is more consistent with a stuck pixel than with content artefacts.

Dead pixel sweep and refresh rate confirmation on the Odyssey G3 27"

With uniformity and viewing angle checked, run the dead pixel sweep across all six solid colour patterns. Samsung support material references ISO 9241-307 for TFT monitor pixel defect thresholds and provides class-based tolerance tables, with cluster defects treated separately.³ Spend enough time on each colour to distinguish a fixed panel defect from temporary image content.

Confirming 165 Hz and FreeSync activation

After the pixel sweep, confirm the refresh rate is running at 165 Hz. Open Windows Display Settings and navigate to Advanced Display Settings, then choose the supported refresh rate from the dropdown.⁴ FreeSync Premium is listed for the LS27AG320 family, so enable adaptive sync in Radeon Software or the monitor OSD if your GPU and cable support it. The Premium tier is not simply the base FreeSync badge: AMD requires low framerate compensation and at least 120 Hz at FHD resolution before a display can carry the label.⁵ With the panel characteristics documented, including uniformity checked against this DSE versus cable artefact map as a fixed reference to scroll a document over (the fastest way to tell DSE from a cable artefact), viewing angle, black level quality, pixel health, and refresh rate, you have a complete baseline for the Odyssey G3.

AOC C27G2Z Monitor Test

AOC built the C27G2Z around a tradeoff: 240 Hz on a curved VA panel can be fast, but overdrive and DSE need careful checking. The AOC C27G2Z is a 27" 1080p 240 Hz VA curved monitor.¹ VA at 240 Hz is less common than IPS or TN at this refresh rate; AOC achieved it via aggressive panel overdrive. Check for overshoot (inverse ghosting) using the response time patterns alongside the standard dead pixel and uniformity tests.

Specifications¹

Overdrive behaviour and MPRT mode on the C27G2Z

Achieving a full 240 Hz refresh rate on a VA panel is a significant engineering challenge that requires aggressive overdrive, and the AOC C27G2Z addresses this challenge by applying high pixel voltage transitions that push the liquid crystal cells to switch faster than they would at lower refresh rates.² In standard 240 Hz operation without MPRT mode enabled, some degree of VA smearing may still remain visible on fast dark-to-dark transitions, which is a fundamental tradeoff inherent to pushing VA technology to refresh rates well beyond the 144 Hz or 165 Hz that are more commonly associated with this panel type.³ Understanding this tradeoff helps you evaluate whether your specific unit's motion performance is within normal expectations.

Comparing MPRT and standard 240 Hz

To assess overshoot rather than smearing, run the response time patterns while carefully observing the leading edge of moving objects against dark backgrounds. A bright, pale artefact appearing ahead of the moving element indicates overshoot from aggressive overdrive, which is the inverse of the dark trailing smear you see when overdrive is insufficient. In MPRT mode, the backlight strobes in precise sync with the refresh rate to reduce motion persistence perceived by the eye. This strobing eliminates most visible smearing but disables Adaptive-Sync on the C27G2Z, making the two modes mutually exclusive and forcing a choice between tear-free variable refresh and minimum motion blur. ³

Test both modes systematically using the response time patterns to find which setting suits your personal balance between residual smearing and strobe flicker. At 240 Hz the tradeoff between these two artefacts is substantially more pronounced than at lower refresh rates because the overdrive voltage required to complete pixel transitions within each 4.17 ms frame window is significantly higher.

What to do with a borderline DSE result

Deciding whether a borderline DSE result is genuinely severe enough to justify a return requires evaluating it thoughtfully against your specific daily usage patterns and tolerance levels rather than applying an abstract universal standard that ignores how you actually use the monitor. The C27G2Z adds an extra wrinkle because its 1500R curved VA panel makes horizontal DSE bands more visible on mid-grey content than on a flat panel with the same underlying uniformity tolerance. ### What to do with a borderline DSE result

Borderline DSE is significantly easier to judge when you evaluate it against the specific use case that matters most to you rather than against an abstract perfection standard. A faint horizontal band that appears only on a full-screen grey test pattern may be entirely tolerable for fast-paced competitive gaming where the eye tracks moving targets, while that same band can become genuinely distracting during long spreadsheet sessions or extended reading where static neutral backgrounds dominate the screen for hours. Sit at your normal desk distance and view the grey pattern from your typical seating position before judging the panel from an unrealistic close range that exaggerates minor variations.

If the result genuinely changes your buying decision, document it thoroughly before the return window closes with photos and written notes. Record whether the patch is visible on grey only, whether it also appears on web pages and documents, and whether it shows during normal desktop use at your typical brightness. A documented distinction between test-pattern-only visibility and everyday-use visibility gives you a stronger factual basis for keeping the unit or requesting an exchange within the retailer return period.

On the C27G2Z specifically, minor horizontal banding on the mid-grey pattern is a common manufacturing characteristic of the curved VA panel and is not grounds for a warranty claim on its own unless it visibly intrudes on ordinary content from your seat. Any banding you can only detect by pressing your face against the glass at close range falls within normal tolerance for a 1500R VA panel.

Curved VA DSE and pixel check workflow

The 1500R curve can make DSE easier to notice across the full panel surface because your viewing angle changes progressively from the centre to the edges, effectively creating a different effective angle for each horizontal band of the display. Run the mid-grey uniformity pattern and view it straight-on at your normal seating distance to establish a baseline that reflects your actual usage position.⁴

Spotting banding patterns unique to curved VA

On curved VA panels specifically, DSE most commonly appears as a band of slightly brighter or differently tinted grey running horizontally across the centre or lower third of the panel, following the curvature geometry rather than appearing as random patches. Minor horizontal variation on a curved VA is a common manufacturing characteristic and not grounds for a warranty claim on its own. After completing the uniformity check, run the dead pixel sweep in sequence across all six solid colour patterns to verify pixel health independently of the uniformity assessment.

At 1080p on a 27-inch screen, individual pixels are physically large enough to inspect at normal viewing distance without leaning in, which is an advantage for pixel defect detection. Dead and stuck pixels are easier to spot at normal seating distance than on higher-density 1440p or 4K panels of the same size. If you find any pixel defects during the sweep, photograph them before the return window closes and check the count against AOC's published warranty terms before contacting support with your evidence.

Dead pixel sweep and refresh rate confirmation on the C27G2Z

After thoroughly assessing overdrive behaviour and DSE severity, run the dead pixel sweep across all six solid colour patterns as the final panel-quality checkpoint. At 1080p on 27 inches, individual pixels are physically large enough to inspect at your normal viewing distance without any need to lean in or scan deliberately, which makes this size and resolution particularly practical for quick defect checks. Spend a full 30 seconds on each pattern, scanning the entire surface systematically. Dead pixels appear as fixed dark dots on any colour pattern regardless of what content is displayed, while stuck pixels appear as constant-colour dots on the black pattern that do not change when the test colour changes. The C27G2Z's 3000:1 native contrast makes stuck bright pixels especially prominent on the black test, far more so than on IPS panels where backlight glow partially masks bright defects against the dark background.⁵

Confirming 240 Hz and Adaptive-Sync

With panel quality fully characterised, verify the monitor is actually running at 240 Hz before finalising your assessment. Open Windows Display Settings and navigate to Advanced Display to confirm the active refresh rate. DisplayPort is the preferred connection for the full 240 Hz range and the 280 Hz overclock, while HDMI also supports 240 Hz on this model according to AOC's specifications.² If the refresh rate shows only 60 Hz or 144 Hz, check the cable, GPU output, monitor OSD input selection, and Windows refresh-rate setting in that order. Confirm FreeSync is enabled in both the OSD and your GPU control panel, because DisplayPort Adaptive-Sync lets a compatible display match its refresh rate to the GPU output frame by frame, producing smoother variable-refresh operation that eliminates tearing without adding input lag.⁶

Confirming the full 240 Hz is active ensures the overdrive and motion performance results from your earlier tests represent actual operating conditions rather than a reduced refresh rate that would invalidate your motion-clarity observations. With panel quality characterised and 240 Hz confirmed, your C27G2Z baseline is complete. Repeat the key tests after any OSD adjustment or cable change, switching between MPRT and standard 240 Hz side by side in this MPRT versus 240 Hz comparison where the overshoot-versus-smearing tradeoff shows up directly on screen, so your later observations remain comparable to the initial baseline you established at the start of the evaluation.

Samsung Odyssey G7 Monitor Test

Use the Samsung Odyssey G7 when you want to know whether VA contrast, black smearing, or edge bleed is affecting your setup. The Samsung Odyssey G7 is a 240 Hz 1440p VA panel in either 27" or 32" size with a 1000R curvature. VA panels have excellent native contrast, but they can show black smearing with fast-moving content and narrow viewing-angle contrast shifts.¹ Use this tool to assess these characteristics.

Specifications²

Assessing black crushing on the Odyssey G7

Black crushing is the defining test for VA panels, and the Odyssey G7's high native contrast makes near-black tonal separation important to check.² Black crushing occurs when shadow detail near absolute black merges into pure black, compressing the tonal range between the darkest grey and pure black. Gaming scenes with dark environments are the most affected in everyday use.

How to check for black crushing

Open the gradient pattern and look at the near-black end of the tonal range. On a properly performing G7, the darkest grey steps should each be individually distinguishable from the pure black step. If those steps merge into a single undifferentiated region, black crushing is significant enough to affect shadow detail in dark gaming content. Compare the near-black end against the near-white end of the same gradient. VA panels typically reproduce near-white tones clearly, making that asymmetry a useful diagnostic for how severe the shadow-end compression actually is on your specific unit.³

When to retest the G7

The Samsung Odyssey G7 is a 240 Hz VA panel whose visual characteristics shift meaningfully depending on its current operating state, which means that a single test at one fixed configuration may not reveal the complete picture of how the panel will perform during your actual mixed usage. ### When to retest the G7

Retest the G7 after you have chosen the refresh rate and response-time mode you actually plan to use, because a panel can look meaningfully different at 60 Hz, 120 Hz, and 240 Hz when the overdrive path and VRR state change with the signal. If you only test once at a single configuration, you may capture a setup artefact specific to that mode rather than the true characteristics of the monitor itself, which is why multi-state testing is essential before filing any return claim.

Start with the fixed refresh rate you use most often, then repeat the key patterns with VRR enabled and compare the results side by side. If a smudge, smear, or glow patch is only visible during one state, note that state precisely in your return notes so support can reproduce the conditions. If the same issue appears in both fixed-refresh and VRR testing, the evidence is much stronger for a warranty or return discussion because the problem is independent of the refresh mode.

VA smearing and 240 Hz verification on the G7

At 240 Hz, the Odyssey G7 requires aggressive pixel overdrive to keep response times competitive, so the interplay between smearing and overshoot becomes the central motion-quality question at this refresh rate. Start with the middle response-time preset, then test Faster or Extreme settings for overshoot, keeping in mind that each step up in aggressiveness trades reduced smearing against increased inverse ghosting. Inverse ghosting appears as a bright halo ahead of fast objects on dark backgrounds, which is visually distinct from the dark trailing smear of underdrive.⁴

To assess smearing accurately, use the response time test pattern while tracking a moving element across the screen with your eyes under controlled room lighting. True VA smearing appears as a dark shadow trailing behind fast objects on dark backgrounds, most visible during high-contrast transitions. At 240 Hz, frame intervals are short enough (4.17 ms per frame) that smearing is less pronounced than on the same VA panel at 60 Hz, but it remains more visible than on comparable IPS panels pushed to the same refresh rate.⁵

Confirming pixel and backlight checks

After assessing motion characteristics thoroughly, run the dead pixel and backlight tests at your usual refresh rate to complete the panel evaluation. Holding 240 Hz is not necessary for static pattern testing because pixel defects and backlight anomalies remain visible at any stable refresh rate once the signal is consistent. The full black pattern in a dark room shows the VA's deep black level directly, making it easier to distinguish between the panel's native glow characteristics and actual backlight bleed at the edges. Confirm the contrast advantage over IPS is present and genuine before moving on to the mid-grey uniformity check.

Uniformity check and dead pixel sweep on the Odyssey G7

After the motion tests, run the backlight uniformity check to confirm VA panel consistency. Open the mid-grey pattern from straight-on at your normal seating distance under standard room lighting. VA panels can show dirty screen effect, meaning patches or streaks of slightly different brightness on neutral mid-grey content that are static relative to the panel position. The Odyssey G7 is a 1000R curved panel, so check uniformity straight-on before judging edge-to-edge variation, and resist the urge to twist your viewing angle mid-test because that changes the apparent brightness of any patch you find.

Mild DSE is expected and common on curved VA at 27 and 32 inches, and most units show faint banding near the side bezels that only appears on mid-grey at close range. Pronounced patches visible without deliberate scrutiny at your normal viewing position are grounds for a return, so compare what you see against your seating distance rather than pressing your face to the glass during a quick check.⁶

Running the dead pixel sweep on the G7

After the uniformity check, run the dead pixel sweep across all six solid colour patterns in order: red, green, blue, white, black, and grey. Spend 30 seconds on each pattern and scan methodically from corner to corner so you do not miss a defect sitting near the bezel edge where pixels are easy to overlook on a curved panel. A constant-colour dot on the black field that does not appear at the same position on the green and blue patterns is a stuck pixel rather than a dead one.

Stuck pixels sometimes respond to a gentle pressure cycle or a rapid colour-flashing exercise before a warranty claim becomes the only remaining option, so try those steps before filing your return if the dot is not a bright always-on defect. The high-contrast VA panel makes bright defects visually prominent, but pixel-defect thresholds vary by region and purchase policy, so document each defect with photos taken in this dead pixel photo documentation tool before your return window closes, noting whether it appeared on every colour pattern or only a subset, since the VA panel lottery makes every unit slightly different and someone else's G7 photos tell you nothing about yours.