LCD Light-Shielding Layout to Prevent Reflection and Pixel Charging
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Solution Overview
Problem
Existing liquid crystal display devices suffer from image quality issues due to external light reflection and charging, which cause the light-shielding layers to become bright even in a black display state.
Innovation Solution
A display device with a display section comprising a matrix of pixels, scan lines, signal lines, and color filters, where the frame portion and wiring circuit of the effective pixel portion are covered with separated light-shielding layers, and color filters of different colors are stacked at the separation location to reduce light transmittance and prevent external light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If light-shielding layers are connected to each other to cover the frame portion and wiring portion, then external light reflection is prevented, but charges enter pixels and the pixels become bright even in black display state
Solution Approach 1:
The light-shielding layer is divided into a first light-shielding layer covering the frame portion and a second light-shielding layer covering the wiring portion, with a gap between them. This segmentation prevents charge accumulation while maintaining light shielding effectiveness in both regions.
2Object-generated harmful factors
If the light-shielding layer of the frame portion and the light-shielding layer of the wiring portion are separated at the outermost peripheral portion, then pixel charging is suppressed, but the image display quality is insufficient
Solution Approach 1:
Color filters are selectively applied at the gap location between the first and second light-shielding layers. This local modification improves image display quality by compensating for the visual impact of the separation while maintaining the charging suppression benefit.
3Object-generated harmful factors
If crossed Nicols of polarizers are used to suppress charging, then pixel charging is reduced, but external light reflection is not enough to be prevented
Solution Approach 1:
The light-shielding structure is segmented into separate layers for the frame and wiring portions, creating a gap that prevents charge accumulation. This structural segmentation simultaneously addresses both charging suppression and light reflection prevention more effectively than polarizer combinations alone.
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
The solution effectively prevents charging and external light reflection, resulting in a higher quality image display by ensuring that the light-shielding portions do not become bright and that external light reflections are minimized.
Implementation Method 1
the frame portion and the wiring circuit of the effective pixel portion are covered with light-shielding layers
Implementation Method 2
a plurality of color filters having different colors are stacked at the separation location
Data Source
AI summary
A display device includes a display section in which a plurality of pixels are arrayed in a matrix, a plurality of scan lines which select pixels, a plurality of signal lines which supply image signals to the selected pixels, and color filters that are arranged so as to correspond to color displays of the pixels. In the device, the display section includes an effective pixel portion and a frame portion that surrounds the effective pixel portion, and the frame portion and a wiring circuit of the effective pixel portion are covered with light-shielding layers, the light-shielding layers being separated from each other at a certain separation location in the display section, and a plurality of color filters having different colors are arranged by being stacked at the separation location.