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Color tint on edges of display

Overview

Some pen displays exhibit a color tint (purple/lilac or yellow/orange) at the edges of the display.

Appearance

  • The tint is NOT pixelated or rough. It has a very smooth look.

  • It is often seen on all four edges. I can't think of any examples on only three or fewer edges.

  • Can be very faint.

  • You may notice it only when colors on the screen are bright.

  • May appear when you first use your tablet, or develop much later. Out of 30+ pen displays, I have one display (Huion Kamvas 22 Plus) that developed a slight purple edge tint 3+ years after I bought it.

NOTE: The tint is greatly exaggerated in these diagrams.

In practice, the effect is usually VERY subtle - as you can see below.

Examples

Notice that the purple tint is visible even on a pure white background - it slightly darkens the white region

When it appears

This effect can be visible the first time you use your pen display, or it can show up after you've been using the pen display for a long time.

Compared to backlight bleed

Unlike backlight bleed, the tint is often visible even on a very bright or pure white background.

Causes

Based on what I have read, the cause is due to an issue with laminated displays (see: Lamination).

My leading theory as to the specific cause is an issue with the polarizer layer in the display. When there is a polarizer failure it can appear in very different ways visually - sometimes very harsh effects and sometimes much more subtle (as in this case).

The polarizer might

  • delaminate (separate from the rest of the display)

  • be oriented incorrectly

  • be damaged by heat

  • be damaged by pressure

Laminated displays have a layer of optically clear adhesive (OCA) between the glass and the display. This might also contribute to or be the source of the problem.

How often it occurs

Overall it is uncommon.

Of the 30+ pen displays I own, it is present in none of the laminated display devices I have.

Manufacturer pages

Links

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