Display Device Sub-Pixel Area Ratio Control for Pseudo Contour Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices using the area gray scale method struggle to achieve high definition and multiple gray scales due to limitations in increasing the number of sub-pixels, while the time gray scale method often results in display failures like pseudo contours, which current methods have not adequately addressed.
Innovation Solution
A method for driving a display device with a pixel divided into multiple sub-pixels, where the area ratio and lighting period of sub-frames are controlled to express gray scales, allowing for fewer sub-frames and reduced pseudo contours, using various transistors and substrates, and incorporating a combination of area and time gray scale methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the area gray scale method is used to control the number or area of lighting sub-pixels, then gray scale display is achieved, but it is difficult to realize high definition and multiple gray scales because the number of sub-pixels cannot be increased
Solution Approach 1:
The pixel is divided into multiple sub-pixels with different area ratios (e.g., 1:2:4:8), and one frame is divided into multiple sub-frames with different lighting period ratios. By selectively lighting specific sub-pixels in specific sub-frames, multiple gray scales can be achieved without increasing the total number of sub-pixels, thus maintaining high definition while enabling multiple gray scales.
Solution Approach 2:
The invention introduces a temporal dimension by dividing one frame into multiple sub-frames with different lighting periods. This allows gray scale control not only through spatial arrangement of sub-pixels but also through temporal control of lighting duration, thereby achieving multiple gray scales without increasing the number of sub-pixels.
2Manufacturing precision
If the time gray scale method is used to control the length of light-emitting period or frequency of light emission, then multiple gray scales are expressed, but display failure such as pseudo contour may occur
Solution Approach 1:
Different sub-pixels are assigned different area ratios (e.g., 1:2:4:8), creating local quality differences within the pixel. This allows precise control of gray scale levels by selectively activating specific sub-pixels, reducing the occurrence of pseudo contours compared to uniform sub-pixel arrangements.
Solution Approach 2:
The invention dynamically controls the lighting periods of different sub-frames with varying ratios (e.g., 1:2:4:8). By adaptively adjusting which sub-pixels light up in which sub-frames based on the desired gray scale level, the system achieves smooth gray scale transitions and minimizes pseudo contour effects.
3Manufacturing precision
If sub-frames with different lighting periods are used to express gray scales, then multiple gray scales are achieved, but the number of sub-frames increases which may increase device complexity
Solution Approach 1:
The invention combines area gray scale control (through sub-pixels with different area ratios) and time gray scale control (through sub-frames with different lighting period ratios) into a unified driving method. This integration allows multiple gray scales to be achieved using a manageable number of sub-frames and sub-pixels, avoiding excessive device complexity while maintaining high gray scale precision.
Data Source
AI summary
It is an object of the present invention to reduce a cause of pseudo contour when display is performed with a time gray scale method. According to the present invention, one pixel is divided into m sub-pixels so that an area ratio of each sub-pixel becomes 20:21:22: . . . :2m-3:2m-2:2m-1 (m is an integer number of m≧2), and one frame is divided into n sub-frames so that a ratio of a lighting period in each sub-frame becomes 20:2m:22m: . . . :2(n-3)m:2(n-2)m:2(n-1)m (n is an integer number of n≧2). Then, a gray scale is expressed by controlling a manner of lighting in each of the m sub-pixels in each of the n sub-frames.