Multiple View LCD Pixel Region Transmittance Control
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Solution Overview
Problem
Multiple view liquid crystal displays using a parallax barrier suffer from crosstalk issues, particularly in the vicinity of the boundary between visual field ranges, where images intended for different directions overlap, leading to reduced image quality due to the low black luminance in normally black mode, which compromises the high contrast ratio of horizontal electric field modes.
Innovation Solution
A multiple view liquid crystal display with a liquid crystal panel in a normally black mode and a parallax barrier on its front surface, where each pixel is divided into regions with different voltage-transmittance characteristics, with higher transmittance at the pixel ends and lower transmittance at the central parts, to reduce crosstalk without decreasing the contrast ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a parallax barrier is used to separate images in different directions, then multiple images can be displayed simultaneously, but crosstalk occurs where visual field ranges overlap
Solution Approach 1:
The invention applies different voltage-transmittance characteristics to different regions within each pixel. Specifically, the pixel is divided into a first region and a second region, where the first region has higher transmittance and the second region has lower transmittance during low luminance display. This local differentiation allows light from specific pixel regions to be selectively transmitted in different directions, thereby reducing crosstalk between adjacent visual fields while maintaining the multiple image display capability
Solution Approach 2:
Each pixel is segmented into multiple regions with distinct optical characteristics. The pixel is divided into a first region (with higher transmittance) and a second region (with lower transmittance), allowing independent control of light transmission from different parts of the pixel. This segmentation enables precise control over which pixel regions contribute to which visual field, reducing overlap and crosstalk between adjacent images
2Illumination intensity
If the black luminance is reduced to maintain high contrast ratio in normally black mode, then contrast ratio is improved, but crosstalk becomes more visible
Solution Approach 1:
The invention creates different transmittance characteristics in different pixel regions specifically for low luminance display. The first region maintains higher transmittance while the second region has lower transmittance, allowing the overall pixel black luminance to remain low (preserving contrast ratio) while specific regions still transmit enough light to prevent crosstalk visibility in those directions
3Object-affected harmful factors
If the gap between parallax barrier and black matrix is reduced to minimize reverse viewing, then reverse viewing crosstalk is reduced, but manufacturing precision requirements increase
Solution Approach 1:
Instead of relying solely on reducing the gap between the parallax barrier and black matrix, the invention introduces local quality variations within each pixel through different voltage-transmittance characteristics in different regions. This approach addresses reverse viewing crosstalk through optical property differentiation rather than dimensional precision, thereby reducing manufacturing complexity and tolerance requirements
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 reduces crosstalk rates while maintaining the high contrast ratio, enhancing the display quality by ensuring that only light from the pixel ends contributes to crosstalk, thereby improving image separation and visibility.
Implementation Method 1
Each pixel of the liquid crystal panel includes a first region and a second region which have different voltage-transmittance characteristics from each other
Implementation Method 2
a light shielding layer which is provided on a front side (a visual recognition side) and is referred to as a parallax barrier. The parallax barrier is disposed to shield light emitted from each pixel of the liquid crystal panel in a specific direction
Data Source
AI summary
Each pixel of a multiple view liquid crystal display in a normally black mode includes a counter electrode provided with a slit for generating a fringe electric field. An alignment film subjected to liquid crystal alignment processing in a predetermined direction is disposed on a surface of a TFT substrate provided with the counter electrode. An angle formed by an extending direction of a slit at an end of a pixel region (a first region) and a direction of the liquid crystal alignment processing is greater than an angle formed by the extending direction of the slit in a central part of the pixel region (a second region) and the direction of the liquid crystal alignment processing. The first region has a higher transmittance than that in the second region when low luminance display is carried out.