Thin Film Transistor Array Panel Contact Hole Density Optimization
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Solution Overview
Problem
In liquid crystal displays (LCDs), the light-blocking member does not effectively cover contact holes between opaque and transparent electrodes, leading to light reflection and deteriorated display quality.
Innovation Solution
A thin film transistor array panel design where the area density of contact holes in the peripheral area is equal to or less than three times that in the display area, with a light-blocking member covering these holes to reduce external light reflection, thereby improving transmittance and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the light-blocking member does not cover contact holes, then the manufacturing process is simpler, but light reflection occurs and display quality deteriorates
Solution Approach 1:
The patent divides the contact holes into two categories: first contact holes in the peripheral area and second contact holes in the display area. This segmentation allows different area density requirements to be applied to different regions, enabling the light-blocking member to cover contact holes in the display area while maintaining manufacturing simplicity in the peripheral area.
Solution Approach 2:
The patent applies different area density constraints to different spatial locations: the area density of first contact holes in the peripheral area is controlled to be equal to or less than three times that of second contact holes in the display area. This local quality approach ensures light reflection is minimized where it matters (display area) while allowing manufacturing flexibility elsewhere.
2Reliability
If contact hole area density in peripheral area is high, then electrical connection is improved, but light reflection increases and display quality deteriorates
Solution Approach 1:
The patent establishes a specific parameter relationship: the area density of first contact holes is controlled to be equal to or less than three times that of second contact holes. This parameter change optimizes the balance between electrical connection reliability and light reflection prevention, ensuring adequate electrical connection while minimizing display quality degradation.
3Object-affected harmful factors
If the light-blocking member covers all contact holes, then light reflection is reduced, but device complexity increases
Solution Approach 1:
The light-blocking member is designed to differentially cover contact holes based on their location: it covers second contact holes in the display area to prevent light reflection, while its coverage of first contact holes in the peripheral area is optimized to maintain electrical connection without excessive complexity. This segmented approach reduces overall device complexity compared to universal coverage.
Solution Approach 2:
The light-blocking member applies different coverage strategies to different regions: full coverage of contact holes in the display area where light reflection is critical, and optimized coverage in the peripheral area where electrical connection is the priority. This local quality differentiation reduces unnecessary structural complexity.
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 design reduces light reflection and enhances the display quality of LCDs by optimizing the contact hole area density and positioning of the light-blocking member, improving transmittance and simplifying the manufacturing process.
Implementation Method 1
Light is then reflected by the contact hole, thereby deteriorating the display quality of the LCD
Data Source
AI summary
A thin film transistor array panel includes; a substrate including a display area and a peripheral area, a display area signal line disposed in the display area, a display area thin film transistor connected to the display area signal line, a plurality of peripheral area signal lines disposed in the peripheral area, a light-blocking member disposed on the display area signal line, the display area thin film transistor, and the plurality of peripheral area signal lines, a transparent connection electrically connecting the plurality of peripheral area signal lines to each other through a plurality of first contact holes, and a pixel electrode connected to the display area thin film transistor through a second contact hole, wherein an area density of the first contact hole in the peripheral area is less than or equal to about three times an area density of the second contact hole in the display area.