Liquid Crystal Display Sub-Pixel Segmentation for View Angle and Response Speed
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Solution Overview
Problem
Liquid crystal display apparatuses using the VA mode suffer from significant luminance fluctuations when viewed from different angles, and existing multi-pixel structures do not adequately improve view angle characteristics or response speed.
Innovation Solution
A liquid crystal display apparatus with a matrix of pixels, each comprising a first sub-pixel and a sub-pixel group with multiple second sub-pixels, where a lower gray level voltage is applied to the first sub-pixel and higher gray level voltages with different values are applied to the second sub-pixels, utilizing space-divisional-driving to independently drive each sub-pixel, with the area of the first sub-pixel being smaller than the sub-pixel group.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multi-pixel structure with two sub-pixels is used, then view angle characteristic is improved to some extent, but response speed is not sufficiently improved
Solution Approach 1:
The pixel is divided into three sub-pixels (first sub-pixel 20A, second sub-pixel 20B1, third sub-pixel 20B2) with different areas and drive voltages. The first sub-pixel has a smaller area and receives higher drive voltage for faster response, while the second and third sub-pixels have larger areas and receive lower drive voltages. This segmentation allows different sub-pixels to be optimized for different functions, resolving the contradiction between response speed and view angle characteristic.
Solution Approach 2:
Different sub-pixels are assigned different drive voltages and areas according to their specific functions. The first sub-pixel (20A) with smaller area receives higher drive voltage to achieve fast response speed, while the second (20B1) and third (20B2) sub-pixels with larger areas receive lower drive voltages to maintain good view angle characteristics. This local differentiation of quality parameters resolves the contradiction.
2Device complexity
If the same drive voltage is applied to multiple sub-pixels driven by one TFT element, then device complexity is reduced, but view angle characteristic improvement is insufficient
Solution Approach 1:
The patent applies different drive voltages to different sub-pixels (higher voltage to first sub-pixel 20A, lower voltage to second 20B1 and third 20B2 sub-pixels) to achieve different luminance levels and improve view angle characteristics. This local differentiation of drive voltage quality compensates for the limited structural complexity increase, resolving the contradiction between device complexity and view angle characteristic improvement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively disperses luminance fluctuations when viewed obliquely, improves view angle characteristics, and enhances response speed by applying higher drive voltages to the first sub-pixel at lower gray levels.
Implementation Method 1
each of the pixels includes a first sub-pixel 20A and a sub-pixel group 20B having a plurality of second sub-pixels 20B1 and 20B2, in which a lower gray level voltage is applied to the first sub-pixel 20A, and higher gray level voltages with different values are applied to the second sub-pixels 20B1 and 20B2, respectively
Data Source
AI summary
The present invention provides a liquid crystal display apparatus realizing an improved view angle characteristic of luminance and higher response speed. A sub-pixel group is provided with a plurality of sub-pixels. At the time of display driving on liquid crystal elements of each pixel, space-divisional-driving which allows each of the first and the second sub-pixels to be driven separately is performed. By the space-divisional-driving, fluctuations in the gamma characteristic in the case of seeing a display screen from an oblique direction are effectively dispersed, and the view angle characteristic of luminance improves. Area of the first sub-pixel is set to be smaller than whole area of the sub-pixel group. As a result, the drive voltage to be applied to the first sub-pixel at the time of lower gray level becomes high, and response speed improves.