Liquid Crystal Display Device Dual Panel Mask Sharing
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Solution Overview
Problem
The manufacturing of liquid crystal display devices requiring two liquid crystal display panels with different electrode and wiring shapes necessitates twice as many masks, increasing complexity and cost.
Innovation Solution
A liquid crystal display device comprising two panels with at least one of the video signal lines, scanning lines, semiconductor layers, and pixel electrodes patterned in an identical shape, allowing the use of a single mask for both panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two liquid crystal display panels with different electrode and wiring shapes are used to achieve high contrast ratio, then the contrast ratio is improved, but the number of masks required doubles, increasing manufacturing complexity and cost
Solution Approach 1:
The patent applies asymmetry by intentionally creating different patterns in the second liquid crystal display panel compared to the first panel. Specifically, the second panel has line electrodes and wirings that are rotated 90 degrees or have different shapes, allowing the panels to serve different optical functions while sharing the same mask set for manufacturing efficiency
Solution Approach 2:
The patent implements universality by designing a single mask that can pattern multiple different electrode and wiring configurations across two different liquid crystal display panels. The mask is configured with opening regions that correspond to both the first panel's electrode shapes and the second panel's rotated/different electrode shapes, allowing one mask to serve multiple patterning functions
2Reliability
If two liquid crystal display panels with different wiring shapes are used to achieve high contrast ratio, then the contrast ratio is improved, but the manufacturing cost increases due to requiring twice as many masks
Solution Approach 1:
The patent merges the patterning functions for two different liquid crystal display panels into a single mask. The mask combines opening regions for the first panel's electrodes and wirings with opening regions for the second panel's rotated/different electrodes and wirings, allowing simultaneous or sequential patterning of both panels using one mask, thereby reducing manufacturing cost
3Reliability
If two liquid crystal display panels with different electrode shapes are used to achieve high contrast ratio, then the contrast ratio is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent segments the mask into multiple opening regions, each corresponding to different electrode and wiring patterns for the two liquid crystal display panels. The mask includes first opening regions for the first panel's patterns and second opening regions for the second panel's rotated/different patterns, allowing the complex patterning to be achieved through a single segmented mask structure
Data Source
AI summary
A liquid crystal display device comprising: a first liquid crystal display panel; and a second liquid crystal display panel opposed to the first liquid crystal display panel, wherein each of the first liquid crystal display panel and the second liquid crystal display panel includes a video signal line, a scanning line, a transistor provided in each pixel, and a pixel electrode provided in each pixel, and at least one of the video signal line, the scanning line, a semiconductor layer of the transistor, and the pixel electrode is patterned in an identical shape in the first liquid crystal display panel and the second liquid crystal display panel.