display / touch / bonding solutions
A faint outline of the previous screen is one of the few display symptoms that users describe accurately and diagnose incorrectly. On an in-plane panel the pattern is almost always retained charge or a slow relaxation rather than the permanent material change that the word burn-in implies, and the two have different owners, different fixes and different consequences for the warranty conversation.
Not in the OLED sense; it retains images.
An in-plane liquid crystal panel can hold a faint version of a previous image for minutes or hours, but the liquid crystal is not consumed the way an organic emitter is, so the effect normally relaxes and is not permanent material damage.
What users call burn-in on an LCD is usually one of three things: residual charge that takes time to dissipate, a slow relaxation of the liquid crystal after a long static image at high contrast, or a genuine defect such as a stuck pixel region or a driver fault that happens to follow the shape of the interface. Distinguishing them is a matter of observation rather than opinion, because the three behave differently over time, at different temperatures and under different drive conditions. The comparison that people usually have in mind when they ask the question is between an emissive panel and a liquid crystal one, and that comparison belongs on its own page rather than being repeated here.
Static image, known duration, then a grey field.
Display a defined high-contrast pattern for a stated period, switch to a uniform mid-grey field and photograph the result at a fixed exposure, then repeat after a defined interval to see whether the outline fades.
Three details make the record usable. The grey level matters because retention is most visible at mid grey rather than at black or white. The exposure and white balance must be fixed, since an automatic camera will hide the very difference being documented. The interval matters because a pattern that disappears in five minutes describes a different phenomenon from one that is still visible after a day. Recording the panel temperature with each observation closes the last gap, because a cold panel relaxes more slowly and a test run in a cold room can look like a fault that does not exist at normal operating temperature.
Four causes explain almost every case.
Residual DC charge in the pixel is the most common and the most benign; a long static image is second; a drive or timing problem that leaves a small DC offset is third; and a genuine panel fault such as a damaged region is last but the most serious.
| Cause | Signature | What resolves it |
|---|---|---|
| Residual charge | Faint outline, fades in minutes | Time, a pattern change, power cycle |
| Static image history | Outline follows the interface, fades over hours | Content change, lower contrast, screen saver |
| Drive or timing offset | Recurs at the same place, returns quickly | Firmware or timing correction |
| Panel fault | Sharp region, does not fade, may spread | Panel replacement |
The table is also the triage order. If the outline fades with time, the investigation belongs with content and firmware; if it recurs in the same place within minutes of the pattern being removed, the drive and the timing settings deserve the attention before the panel is blamed. The measurement conventions that keep the photographs comparable come from bodies such as the International Commission on Illumination, with instrument traceability following NIST practice.
Content and drive changes hold; panel swaps usually do not.
Changing the content, lowering the contrast of static elements, adding a slow pixel-shift or a screensaver, and correcting the drive or timing settings address the causes that actually produce retention; replacing the panel usually returns the same symptom on the next unit.
The fixes that fail are the ones aimed at the symptom. A software overlay that hides the outline leaves the underlying charge behaviour unchanged. Raising the refresh rate without correcting the polarity or the DC offset can make the pattern return faster. And a board-level swap performed without recording the original conditions cannot be evaluated, because nobody knows what changed. The practical rule is to change one variable at a time, record the observation with the same method, and keep the units that improve as evidence for the next build rather than as a repair, an approach that matches the field-failure practice described elsewhere in the CDTech news section.
Use the fade time and the location.
An outline that fades within the observation window and follows the shape of the interface is not a panel fault; one that stays sharp, recurs immediately or appears in a region no content occupied is.
Two further discriminators are worth applying. If two units from the same batch behave identically with the same content, the cause is systematic and belongs in the design or firmware review. If one unit from a batch misbehaves while its neighbours are clean, the cause is more likely local, and the panel, the bonding or the drive connection become the candidates. Recording which of those two patterns applies before contacting the supplier turns a complaint into a diagnosis, which is the difference between a returned unit that is replaced and one that is investigated.
Conditions, images, timing and serial numbers.
A supplier can act on a retained-image report only if it carries the pattern used, the duration, the panel temperature, the drive and firmware version, the fade observations and the unit serial numbers.
Photographs at a fixed exposure on a mid-grey field are the core of that pack, with a short video showing whether the outline fades in real time. Where the product runs at a temperature extreme, an observation from each corner makes the case much stronger, because a panel that is within specification at 25 degrees may still need an adjusted drive at minus 20. The unit identification matters more than it appears: it allows the supplier to check whether the panels came from one production lot, which changes the investigation entirely. Where the display sits inside regulated equipment, the failure record also has to satisfy the documentation expectations that surround IEC 62368-1.
Design the interface so no image sits still.
Retention is prevented by removing the conditions that cause it: static high-contrast elements held for hours, a drive scheme with a small DC offset, and a firmware build that never refreshes the panel's charge state.
Three measures cover most products. Keep permanently displayed elements below the contrast level that accelerates charge accumulation, and let the rest of the interface move. Confirm the polarity inversion scheme and the timing against the panel's specification rather than inheriting them from a previous design. And where the product shows one screen for days at a time, add a slow shift or a periodic inversion so no pixel is driven the same way indefinitely. None of the three costs hardware, and together they remove the mechanism rather than the symptom. Handling and assembly practice during build follows the static control programme published by the EOS/ESD Association, with workmanship expectations from IPC.
Decide now what a replacement panel means.
Because a genuine panel fault is the least likely cause, the lifecycle question for a retained-image product is not about panel supply but about whether a replacement panel can be dropped into an existing build without retuning.
That depends on how tightly the drive and timing were matched to the panel. Where the firmware carries a parameter set tuned for one panel, a replacement from a different production lot may need the same values checked, and a second-source panel from a different supplier will need a full re-tune. Both are manageable if the parameter set is versioned and documented alongside the specification; both become urgent if the tuning lives only in a build image. An end-of-life notice, a last-time-buy quantity and a documented form-fit-function alternative belong on the same sheet, because they describe the same lifecycle risk: a long-life product that stops being buildable when the display changes. Panel product-life and capacity movements across the industry are tracked by research houses such as TrendForce.
Is IPS burn-in permanent?
Usually not. What appears on an in-plane panel is normally retained charge or slow relaxation that fades over minutes to hours, rather than the permanent material change that affects an organic emitter. A sharp region that never fades is the exception and points to a real fault.
How do I tell image retention from a real fault?
Watch the fade and the shape. Retention follows the interface, softens with time and improves when the content changes. A fault stays sharp, can appear where no content was displayed and may recur immediately after the pattern is removed.
How do I fix IPS image retention?
Reduce the contrast of static elements, let the interface move, and check the polarity and timing settings against the panel specification. Where the product shows one screen for long periods, add a slow shift or periodic inversion so no pixel is driven the same way continuously.
Does image retention affect panel life?
A benign retention event does not shorten the life of the panel, because nothing has been consumed. A repeated DC offset is a different matter, since it keeps the cell under a condition it was not designed for, so correcting the drive is worth doing even when the symptom is only cosmetic.
Send the pattern used, the duration, the temperature and the fade photographs to CDTech; the reply will say whether the behaviour is expected for the panel or whether the drive and timing settings need attention.
Contact sales@cdtech-lcd.com or use the contact page to request a specification review.
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