LCD Panel Subpixel Compensation for Privacy and Visual Comfort
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Solution Overview
Problem
Conventional LCD panels with privacy protecting designs using polarizer alignment suffer from user discomfort due to giddy feelings when viewing images at normal angles under narrow viewing angle display mode, as brightness differences between eyes cause visual discrepancies.
Innovation Solution
The LCD panel is divided into regions with sub-pixels having first and second display areas and compensation display areas, where the compensation display areas have greater cell gaps and are enabled to compensate brightness at angles adjacent to normal viewing angles, reducing brightness differences between eyes and maintaining privacy protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the LCD panel uses privacy protecting design with polarizer alignment and narrow viewing angle mode, then privacy protection is improved, but user comfort deteriorates due to giddy feelings from brightness differences between eyes
Solution Approach 1:
The patent divides the LCD panel into multiple regions (first region and second region) with different alignment characteristics. Each region has sub-pixels with display areas and compensation display areas that provide different brightness characteristics at side viewing angles. This local differentiation allows the panel to maintain privacy protection through asymmetric brightness distribution while compensating for the giddy effect by ensuring both eyes receive appropriate brightness levels at normal viewing angles.
Solution Approach 2:
The patent changes the alignment parameters of liquid crystal molecules in different regions of the panel. Specifically, the first and second display areas have different main alignment vectors, and compensation display areas have different cell gaps and alignment characteristics. By adjusting these parameters, the patent achieves different brightness distributions at various viewing angles, resolving the contradiction between privacy protection and user comfort.
2Reliability
If the LCD panel divides regions with different alignment directions to achieve privacy protection, then privacy protection is improved, but device complexity increases due to multiple display areas and compensation areas
Solution Approach 1:
The patent segments each sub-pixel into multiple display areas (first display area, second display area, and compensation display area), with each area having different alignment characteristics. This segmentation allows independent control of brightness distribution in different regions, achieving privacy protection through asymmetric brightness patterns while managing complexity through systematic division of functional areas.
Solution Approach 2:
The patent designs the sub-pixels to serve multiple functions: the first and second display areas provide primary image display with different alignment directions for privacy protection, while the compensation display areas compensate for brightness imbalances at side viewing angles. This multi-functionality allows a single panel structure to achieve both privacy protection and viewing comfort without requiring separate systems.
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 mitigates the giddy feeling in users by ensuring consistent brightness perception at normal viewing angles while maintaining effective privacy protection by ensuring uneven brightness is only visible at side viewing angles.
Implementation Method 1
the LCD panel is divided into two regions such as the first region and the second region. The changes of brightness with variant polar viewing angles and variant azimuth viewing angles have different tendencies in the first region and the second region of the LCD panel
Implementation Method 2
the LCD panel is disposed between two polarizers, while the directions of the light transmission axis of the two polarizers respectively are configured parallel to the line direction and the row direction in the pixel array of the LCD panel
Data Source
AI summary
A liquid crystal display panel divided into a first and a second regions respectively having a plurality of sub-pixels arranged in array is provided. Each sub-pixel has a first display area providing a first main alignment vector, a second display area providing a second main alignment vector, and a compensation display area. A direction of the first main alignment vector is opposite to that of the second main alignment vector. When the liquid crystal display panel states in the narrow viewing angle display mode, driving voltages of the first display areas in the first region are substantially greater than driving voltages of the second display areas in the first region, driving voltages of the first display areas in the second region are smaller than driving voltages of the second display areas in the second region, and all the compensation display areas in the first and the second regions are enabled.