LCD Barrier Structure for Viewing Angle and Brightness Control
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Solution Overview
Problem
Conventional LCD devices with wide viewing angle modes suffer from reduced brightness due to aperture ratio decrease caused by barriers, and the manufacturing process is costly and complex.
Innovation Solution
The LCD device incorporates barriers on a substrate that contact and overlap black matrixes, allowing for selective switching between narrow and wide viewing angle modes by controlling light paths, with the barriers formed in a bar shape to match the black matrixes' width and designed to be partially or entirely in contact with them, facilitating the fabrication process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If barriers are added to control viewing angle, then viewing angle control is improved, but aperture ratio decreases and brightness is reduced
Solution Approach 1:
The patent combines the barrier structure with the black matrix by making the barrier extend from the color filter substrate to contact the black matrix. This integration allows the barrier to perform viewing angle control while the black matrix continues to define pixel boundaries, reducing the need for additional light-blocking structures that would further reduce aperture ratio.
Solution Approach 2:
The barrier is designed with a vertical dimension extending from the substrate surface toward the black matrix, creating a three-dimensional structure. This vertical extension allows the barrier to control light paths at different angles without occupying excessive horizontal space, thereby preserving more aperture area for light transmission.
2Adaptability or versatility
If barriers are added to control viewing angle, then viewing angle control is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The barrier is formed as an integrated structure with the black matrix rather than as a separate component. The barrier extends from the color filter substrate and contacts the black matrix, allowing both structures to be fabricated in the same manufacturing process steps, thereby reducing the number of separate fabrication processes and lowering manufacturing complexity.
3Area of stationary object
If barriers are made to contact black matrixes, then aperture ratio is enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The barrier is designed to contact the black matrix at a predetermined position, and the manufacturing process is configured to form the barrier and black matrix in sequence with predetermined dimensional relationships. This preliminary design of the contact geometry allows standard manufacturing tolerances to achieve the desired precision, reducing the need for ultra-precise manufacturing processes.
Data Source
AI summary
A liquid crystal display (LCD) device comprises a substrate, and red, green, blue (RGB) color filters. The RGB color filters are spaced from one another with a predetermined gap therebetween on the substrate, and define RGB sub-pixels. The LCD device further comprises black matrixes disposed at each space between the RGB color filters, and barriers disposed at each interface among the RGB sub-pixels such that the barriers control a path of light that passes through a corresponding sub-pixel.