Photo Spacer Light Blocking Layer LCD Aperture Ratio
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Solution Overview
Problem
Conventional liquid crystal displays (LCDs) face issues with light leakage and mechanical strength due to ball spacers, which also lead to color shift and reduced aperture ratio, prompting the need for an alternative spacer solution that prevents light leakage without compromising mechanical strength or causing color shift.
Innovation Solution
The implementation of a photo spacer supported by an opaque light blocking layer in specific sub-pixel regions of the LCD, where the size of the sub-pixel with the light blocking layer is larger than without it, balances aperture ratios and prevents color shift, using materials like metal or alloys for the blocking layer and photoresist for the spacer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ball spacers are used to separate substrates, then mechanical strength is improved, but light leakage and color shift occur
Solution Approach 1:
The patent removes ball spacers from the display device structure and replaces them with photo spacers formed from photoresist material. This extraction eliminates the light leakage problem caused by ball spacers while maintaining substrate separation functionality through the photo spacer structure.
Solution Approach 2:
The patent introduces photo spacers as an intermediary element between the substrates. These photo spacers are formed by photolithography processes and serve as mediators that maintain the required gap between substrates without causing light leakage, replacing the dysfunctional ball spacer intermediary.
2Object-generated harmful factors
If photo spacers are used to prevent light leakage, then light leakage is eliminated, but mechanical strength is reduced
Solution Approach 1:
The patent employs composite material structures where photoresist-based photo spacers are combined with transparent electrode patterns and color filter layers. This composite approach allows the photo spacers to provide both optical isolation (preventing light leakage) and structural support (maintaining mechanical strength) when properly integrated into the display device architecture.
3Area of stationary object
If transparent sub-pixel regions are increased to improve aperture ratio, then aperture ratio is improved, but color shift occurs
Solution Approach 1:
The patent applies local quality control by forming light blocking layers in specific local regions where color shift problems occur. Rather than uniformly treating all sub-pixel regions, the light blocking layers are strategically positioned in transparent sub-pixel regions to locally correct color balance issues while preserving overall aperture ratio.
4Object-generated harmful factors
If light blocking layers are added to prevent color shift, then color shift is prevented, but aperture ratio is reduced
Solution Approach 1:
The patent utilizes parameter changes by controlling the optical properties and physical dimensions of light blocking layers through photolithography process parameters. By adjusting the thickness, material composition, and geometric dimensions of these layers, the patent optimizes the balance between color shift prevention and aperture 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 configuration effectively eliminates light leakage, maintains mechanical strength, and enhances the average aperture ratio while preventing color shift, resulting in improved display performance and simplified fabrication.
Implementation Method 1
An opaque light blocking layer is disposed in at least one of the RGB transparent sub-pixel regions of the first substrate. A photo spacer corresponds to the opaque light blocking layer, supporting the opposite first and second substrates.
Data Source
AI summary
A system for displaying images is disclosed. A display device comprises a first substrate comprising a plurality of pixels, each comprising RGB transparent sub-pixel regions. A second substrate comprises RGB regions opposite the first substrate, wherein the transparent sub-pixel regions respectively correspond to the three major color regions. A light blocking layer is disposed in one of the transparent sub-pixel regions of the first substrate. A photo spacer corresponding to the light blocking layer is formed, supporting the opposite first and second substrates.