Curved LCD Thin Film Transistor Substrate Misalignment
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Solution Overview
Problem
In liquid crystal display devices, especially when curved, misalignment between upper and lower substrates leads to texture in the displayed image due to stress on the substrates, causing viewing differences for viewers at different angles.
Innovation Solution
A thin film transistor array panel design where the stem of the pixel electrode and the divided reference voltage line are formed horizontally, with protrusions in the pixel electrode stems to prevent dark portions and improve alignment, reducing texture in curved displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display device is bent to form a curved shape, then viewing difference is compensated, but misalignment between substrates occurs causing texture in the displayed image
Solution Approach 1:
The pixel electrode is divided into multiple segments (first pixel electrode segment, second pixel electrode segment, third pixel electrode segment) arranged in different orientations. This segmentation allows each segment to independently accommodate stress in different directions, preventing overall electrode misalignment while maintaining curved display functionality.
Solution Approach 2:
Different portions of the pixel electrode are designed with different local qualities - the first segment extends in a first direction, the second segment in a second direction, and the third segment in a third direction. This local variation in electrode orientation distributes stress differently across the electrode structure, preventing uniform misalignment that would cause texture.
2Ease of manufacture
If the pixel electrode stem is formed without protrusion, then manufacturing is simpler, but dark portions are generated in the stem area
Solution Approach 1:
A protrusion is formed in advance in the pixel electrode stem portion before final assembly. This preliminary structural modification ensures that the stem area has sufficient surface area to prevent dark portions from forming, addressing the brightness uniformity issue before the display is assembled and tested.
Data Source
AI summary
A thin film transistor array panel includes a first subpixel electrode and a second subpixel electrode electrically connected with a drain electrode through a first contact hole and a second contact hole, respectively. The first subpixel electrode and the second subpixel electrode include a plurality of vertical stems, a plurality of horizontal stems, and a plurality of branch electrodes. The first subpixel electrode is formed above a gate line and the second subpixel electrode is formed below a gate line. The thin film transistor array panel further includes a first protrusion formed in the plurality of vertical stems of the first subpixel electrode and the plurality of vertical stems of the second subpixel electrode.