Defective Pixel Compensation in Display Devices
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Solution Overview
Problem
Display devices often have pixels with different characteristics due to process deviations, leading to defective pixels that affect image quality.
Innovation Solution
An inspection system that captures images of a display device, detects defective pixels, and generates a compensation signal to adjust the luminance of adjacent pixels, thereby compensating for the defective pixel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pixels are formed using the same manufacturing process, then production efficiency is improved, but process deviations cause pixels to have different characteristics leading to defective pixels
Solution Approach 1:
The patent applies preliminary action by detecting defective pixels before the display device is shipped to customers. The inspection system captures images of the display device under test patterns, identifies defective pixels through image analysis, and generates compensation maps in advance. This allows defective pixels to be compensated before reaching the user, resolving the contradiction between mass production efficiency and pixel quality consistency.
2Device complexity
If defective pixels are left uncompensated, then device complexity is reduced, but image quality deteriorates with noticeable defective pixels
Solution Approach 1:
The patent applies local quality by generating compensation maps that apply different compensation values to different regions of the display device. Instead of uniform compensation, the system identifies specific defective pixel locations and creates localized compensation patterns. Adjacent pixels to defective pixels receive different compensation adjustments compared to normal pixels, allowing precise correction of image quality issues while maintaining overall system simplicity.
3Manufacturing precision
If compensation is applied to all pixels, then image quality is improved, but processing time and computational resources increase
Solution Approach 1:
The patent applies partial action by generating compensation maps that only adjust pixels necessary for compensation rather than processing all pixels uniformly. The system identifies defective pixels and their adjacent pixels, then applies compensation only to these specific regions. This selective approach reduces computational overhead and processing time while maintaining image quality, as compensation is applied only where needed rather than across the entire display.
Data Source
AI summary
An inspection system for inspecting a display device including pixels includes a camera for capturing the display device and providing a sensing image signal and an inspection device for receiving the sensing image signal and outputting a compensation signal for compensating for luminance of a defective pixel. The inspection device includes an image detector outputting a sensing input signal corresponding to the sensing image signal, a defect coordinate detector detecting the defective pixel based on the sensing input signal and outputting defect coordinates indicating a position of the defective pixel, an image analyzer analyzing consistency of the defect coordinates based on the sensing image signal and the sensing input signal and outputting final coordinates, and a defect compensation calculator outputting a compensation signal for adjusting luminance of compensation pixels adjacent to the defective pixel from among the pixels based on the final coordinates.