The best way to avoid image burn-in is to limit the amount of static content on the display. Likewise, the rate of diffusion of the image sticking (recovery time) also depends on these factors. The rate of image sticking depends on the image pattern, duration of fixed image, the temperature, and production variations. Transmissive devices, such as LCDs are less susceptible, and in most cases LCD image retention can be reversed. Phosphor based display devices, such as CRTs and color plasma displays are most susceptible, and image retention on phosphor based devices is often irreversible. The fixed pattern causes a parasitic capacitance build up within the LCD component, which prevents the liquid crystal molecules from returning to their normal relaxed state.Īll LCDs/CRTs and color plasma displays are susceptible to image retention, at varying degrees. LCD image retention occurs when a fixed pattern is displayed over a prolonged period of time. Image persistence, image burn-in, and image sticking are terms used to describe LCD image retention. Image Sticking What is Image Sticking? What Causes Image Sticking? The video graphic card is at fault if the faulty pixel moves or goes away. To check for this, simply change the resolution of the system or hook the monitor to another system. A faulty memory cell in the video graphics card can exhibit a phenomenon that looks like a faulty pixel or sub pixel on the LCD screen. The system's video card can also be responsible for apparent faulty pixels or sub pixels. If any of the criteria above are exceeded, this validates a warranty claim. Use this table, based on the ISO9241-30x:2008 specification, as a guide for assessing pixel defects. Type 3 - Maximum allowable faulty sub-pixels The monitor examples below show the allowable number of fault pixels and sub-pixels. There are 5 type 3 sub-pixel faults (most common type) allowed per million pixels. Elo LCD touchmonitors meet and, in most cases exceed, the ISO9241-30x:2008 Class 2 requirements for pixel defects noted in this table:Ī Class 2 display allows 2 type 1 and 2 type 2 faults per million pixels. 9241-30x:2008 covers key issues related to the quality of an LCD monitor including pixel defects.Įlo maintains high quality standards in its flat-panel touch monitors and has selected criteria based on the International Organization for Standardization (ISO) 9241-30x:2008 specification, which defines standard measurements of pixel defects. ISO9241-30x:2008 is the International Standard for the image quality of flat panel LCD monitors. While they can fail in the field, this is also extremely rare. Faulty sub-pixels typically happen during the manufacturing process. While faulty sub-pixels are common, a faulty pixel (three adjacent sub-pixels) is an extremely rare occurrence. Given the large number of sub-pixels per monitor the odds of finding a faulty sub-pixel are high. Since each pixel has three sub pixels that equates to approximately 3.9 million sub-pixels. A typical LCD monitor has 1280 x 1024 pixels. Each cell has a single red, blue and green sub-pixel. LCD monitors are made up of a fixed array of cells. In most cases, these individual spots go unnoticed. The result is a small point of either red, green or blue light or a small black point resembling a period on the screen.
LCD monitors are subject to a phenomenon where a dot on the screen is permanently stuck on or off.