Display Device Pixel Compensation via Electrical Sensing
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Solution Overview
Problem
Existing display devices face challenges in precisely performing optical compensation due to limitations in the optical system, such as the Moire phenomenon, which makes it difficult to compensate for differences in electrical characteristics at a sub-pixel level.
Innovation Solution
A method and device for generating compensation data that involves displaying a test image, photographing it to create a first camera image, applying test input signals to pixels and sensing test outputs, generating weights based on these outputs, and creating a second camera image by applying these weights to the first image, ultimately generating compensation data for precise optical compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If optical compensation is performed using an optical system to photograph test images, then manufacturing process stains can be compensated, but precise sub-pixel level compensation is difficult due to Moire phenomenon and optical system limitations
Solution Approach 1:
The patent replaces the optical system with an electrical measurement system. Instead of using a camera to photograph test images and perform optical compensation, the invention directly measures electrical characteristics (threshold voltage, mobility) of each pixel through electrical testing. This substitution eliminates the Moire phenomenon and optical limitations, enabling precise sub-pixel level compensation.
Solution Approach 2:
The patent introduces a sensing unit as an intermediary to measure electrical characteristics. The sensing unit applies test signals to pixels and measures test outputs (threshold voltage, mobility), serving as a mediator between the pixel and the compensation system. This intermediary approach enables direct electrical measurement without optical interference.
2Manufacturing precision
If electrical characteristic differences between pixel circuits are compensated, then manufacturing variations are addressed, but stains or discoloration still occur during manufacturing
Solution Approach 1:
The patent implements a feedback mechanism where measured electrical characteristics (threshold voltage, mobility) are used to generate compensation data. The sensing unit measures actual pixel characteristics, and this information feeds back to generate individualized compensation values for each pixel, enabling dynamic adjustment to eliminate stains and discoloration.
Solution Approach 2:
The patent applies local quality compensation by measuring and compensating each pixel's individual electrical characteristics rather than using uniform compensation. Each pixel receives customized compensation based on its specific threshold voltage and mobility measurements, addressing local variations that cause stains and discoloration.
Data Source
AI summary
A method of generating compensating data for a pixel circuit differences in a display device includes displaying a test image of pixels of the display device; generating a first camera image by photographing the test image; applying a test input signal to each of the pixels and sensing corresponding test outputs, wherein the test input signal is at least one of a test current and a test voltage; generating weights for the pixels based on the test outputs; generating a second camera image by applying the weights to the first camera image; and generating compensation data for the pixels based on the second camera image.