Display Panel Brightness Uniformity via Frame Subdivision
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Solution Overview
Problem
Liquid crystal display (LCD) panels suffer from brightness non-uniformity in regions with low brightness, which can mislead users, especially in critical applications like medical and military fields.
Innovation Solution
An apparatus and method that convert initial image data into N frames of image data, where sub-pixels with initial grayscale values smaller than a threshold receive a first and second grayscale value in different frames, and those equal to or greater than the threshold retain their initial value, optimizing brightness uniformity by adjusting gamma-corrected brightness values and frame refreshing frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional display methods are used, then device complexity remains low, but brightness uniformity deteriorates in low-brightness regions
Solution Approach 1:
The image data is divided into multiple sub-frames, with different grayscale values assigned to different sub-frames. This segmentation allows precise control of brightness in low-brightness regions by varying the combination of sub-frames displayed, thereby improving brightness uniformity without requiring hardware modifications.
Solution Approach 2:
The processor pre-calculates and prepares multiple sets of image data with different grayscale assignments before display. This preliminary processing enables the display system to achieve enhanced brightness uniformity through software-based frame manipulation rather than requiring real-time hardware adjustments.
2Measurement precision
If grayscale values are adjusted to improve brightness uniformity, then image display accuracy improves, but processing time increases
Solution Approach 1:
The patent applies grayscale adjustment selectively only to low-brightness regions (first portion of image data) while maintaining original grayscale values in other regions. This partial action approach improves image display accuracy where needed without unnecessarily increasing processing time for the entire image.
3Manufacturing precision
If multiple frames with different grayscale values are displayed, then brightness uniformity improves, but frame refreshing frequency requirements increase
Solution Approach 1:
Multiple sub-frames with different grayscale values are merged into a single perceived image through rapid sequential display. The human visual system integrates these sub-frames, achieving enhanced brightness uniformity without requiring the display system to physically maintain multiple simultaneous frames at high refresh rates.
Data Source
AI summary
A method for displaying image using a display panel and an apparatus for enhancing brightness uniformity of displayed image, the method includes receiving a frame of image data, which is divided into a first portion and a second portion based on that each sub-pixel in the first portion has an initial grayscale value smaller than that of each sub-pixel in the second portion; converting the frame of image data into N frames of image data; wherein each sub-pixel in the first portion is provided with a first grayscale value in K of the N frames and a second grayscale value in N-K of the N frames, and each sub-pixel in the second portion is retained with its initial grayscale value, wherein N is no smaller than 2 and K varies from 1 to N-1. The method includes displaying each of the N frames of images respectively based on the N frames of image data according to a frame refreshing frequency.