Liquid Crystal Display Pixel Electrode Structure for Crosstalk Suppression
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Solution Overview
Problem
Liquid crystal display devices with parallax barrier systems suffer from crosstalk issues, particularly 'front crosstalk' and 'reverse viewing crosstalk,' which degrade image quality by allowing leakage of images from one viewing angle range into another, especially when displaying black images, and existing solutions either reduce contrast ratio or do not adequately address reverse viewing crosstalk.
Innovation Solution
The implementation of a liquid crystal display device with a combination structure of first and second pixel electrodes, where the transmittance in the pixel end area is higher than in the pixel main area, allowing selective enhancement of light intensity in the end area to suppress crosstalk while maintaining a high contrast ratio in the main display area, by adjusting the voltages applied to the liquid crystal layer between the electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a parallax barrier system is used to display multiple images in different directions, then viewing angle coverage is improved, but crosstalk between images occurs
Solution Approach 1:
The pixel electrode is divided into different regions (first region and second region) with different transmittance characteristics. The first region has higher transmittance to suppress crosstalk, while the second region maintains normal transmittance for display quality. This local differentiation allows simultaneous improvement of crosstalk suppression and viewing angle coverage.
2Object-generated harmful factors
If transmittance in pixel end area is increased to suppress crosstalk, then crosstalk is reduced, but contrast ratio in main display area decreases
Solution Approach 1:
The pixel electrode structure implements different transmittance levels in different regions: the pixel end area (first region) has increased transmittance to suppress crosstalk, while the pixel main area (second region) maintains lower transmittance to preserve contrast ratio. This spatial differentiation of optical properties resolves the contradiction between crosstalk suppression and contrast ratio maintenance.
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 approach effectively suppresses crosstalk between display images without lowering the contrast ratio, improving image quality by selectively increasing light intensity in the end areas to reduce visibility of crosstalk occurrences.
Implementation Method 1
Each of the plurality of pixels is configured to include a liquid crystal layer whose state is changed by voltages applied by first and second pixel electrodes
Implementation Method 2
The parallax barrier is arranged so as to shield light traveling in a specified direction from each pixel of the liquid crystal panel. Consequently, the light from the liquid crystal panel is separated in a plurality of directions
Data Source
AI summary
Only a first pixel electrode exists just under a first light shielding part of a black matrix, a gate insulating film and an interlayer insulating film exist on the upper layer of the first pixel electrode, and this area is an end area. Just under an opening of the black matrix, a second pixel electrode exists on the uppermost layer of a TFT substrate. The second pixel electrode is formed on the gate insulating film and the interlayer insulating film except a contact part. An area where the second pixel electrode exists on the uppermost layer of the TFT substrate is a main area. By a combination structure of the first pixel electrode and the second pixel electrode, the transmittance of the liquid crystal layer in the end area is made relatively higher than the transmittance in the main area.