# 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.

Characteristics:

* The tilt Is NOT pixelated or rough. It has very smooth look.
* Often seen on all four edges. I can't think of any examples on only a three or less edges
* Can be very faint.
* You may notice it only when 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.

## Appearance

<div align="left"><figure><img src="/files/RMIHTl3vU3Xkkqfithhm" alt="" width="375"><figcaption></figcaption></figure></div>

The tint is greatly exaggerated in these diagrams. In reality in can be very subtle.

<div align="left"><figure><img src="/files/RrF1OAAsncctN5BAYJxK" alt="" width="375"><figcaption></figcaption></figure></div>

Keep in mind the topic being discussed here is when the tint as at the edges, not when the tint is evenly distributed over the entire display.

<div align="left"><figure><img src="/files/iY4mkP6Ohl5chVOY1l2D" alt="" width="375"><figcaption></figcaption></figure></div>

## Examples

<figure><img src="/files/EyB5GYJZBQv0Yd5M8fD9" alt=""><figcaption><p>Notice that the purple tint is visible even on a pure white background - it slightly darkens the white region</p></figcaption></figure>

## When it appears

This effect can be visible the first time you use your pen display, or it can 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 due to an issue with laminated displays (see: [Lamination](/drawtab/guides/pen-displays/lamination.md)).&#x20;

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.&#x20;

## How often it occurs

Overall it is uncommon.

Of 30+ pen displays I own, It is present in NONE of the display devices I have that are laminated.

## Manufacturer pages

* Huion: <https://support.huion.com/en/support/solutions/articles/44002336996-how-to-adjust-color-difference-on-the-edge-of-your-tablet-by-importing-the-new-color-gamut-file-windo>

## Links

* <https://www.reddit.com/r/huion/comments/10i3ftd/purple_edges_on_my_kanvas_24_plus/>
* <https://www.reddit.com/r/huion/comments/vo3o5m/bought_a_kamvas_pro_16_25k_local_retailer_says_it/>
* <https://www.reddit.com/r/4kTV/comments/zt6kf2/sony_purple_edges/>


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