Pixel Data Conversion for Defective Display Bright Spot Correction
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Solution Overview
Problem
Defective transistors in a display device's pixel circuit can cause a pixel to be recognized as a bright spot, leading to display defects.
Innovation Solution
A data converter is employed to generate conversion data based on whether a pixel is defective, adjusting grayscale levels and using correction coefficients to mitigate the brightness difference, and incorporating a lookup table for frequency and grayscale-based corrections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a data converter applies correction coefficients to reduce the brightness of defective pixels, then the occurrence of bright spots is reduced, but the display quality may be compromised due to over-correction or unnatural appearance
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting correction coefficients based on driving frequency and grayscale levels. The system modifies the correction factor as a variable parameter rather than using a fixed value, allowing optimization of both bright spot reduction and display quality maintenance across different operating conditions.
Solution Approach 2:
The patent implements feedback mechanisms by determining whether a pixel is defective through monitoring its brightness characteristics, then applying selective correction only to identified defective pixels. This feedback loop ensures that correction is applied precisely where needed while preserving the natural appearance of functional pixels.
2Measurement precision
If the data converter processes each pixel individually based on defect detection, then the accuracy of bright spot identification is improved, but the processing time and computational complexity increase
Solution Approach 1:
The patent applies local quality by treating defective pixels differently from functional pixels through individualized correction processing. The system identifies specific defective pixels and applies correction only to those locations, rather than uniformly processing all pixels, thereby improving detection accuracy while managing processing time through selective application.
Solution Approach 2:
The patent implements preliminary action by pre-determining which pixels are defective before the main display processing occurs. The defect detection and classification is performed in advance, allowing the correction process to proceed more efficiently with pre-identified target pixels rather than analyzing every pixel in real-time during display updates.
Data Source
AI summary
One or more embodiments provides a display device including a display panel including pixels, a scan driver configured to provide a scan signal to the display panel, a data driver configured to provide a data signal corresponding to the pixels to the display panel, a timing controller configured to control the driving of the scan driver and the data driver, and a data converter configured to convert image data output from the timing controller to conversion data corresponding to a first pixel of the pixels based on whether the first pixel is defective, and to generate the data signal.