LCD with Built-in Touch Panel on Upper Substrate
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Solution Overview
Problem
The integration of a touch screen panel with liquid crystal displays (LCDs) increases the thickness of the device and can lead to reduced durability, touch sensitivity, and manufacturing yield due to the conventional placement of the touch screen panel on the front face of the LCD.
Innovation Solution
The LCD incorporates the upper substrate as the substrate for the touch screen panel, with sensing patterns, color filters, and a common electrode formed on the bottom surface, and a ground electrode between the sensing patterns and the liquid crystal layer to reduce thickness and enhance durability and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the touch screen panel is provided on the front face of the LCD, then the touch input function is achieved, but the thickness of the device increases
Solution Approach 1:
The patent merges the touch screen panel with the LCD by forming the sensing patterns, color filters, and common electrode on the upper substrate of the LCD itself, rather than placing a separate touch panel on the front face. This integration eliminates the need for additional thickness while maintaining both display and touch input functions.
Solution Approach 2:
The upper substrate of the LCD serves dual functions: as the display substrate for the liquid crystal panel and as the substrate for the touch screen panel. By making the upper substrate multi-functional, the patent eliminates the need for separate components, thereby reducing overall device thickness while achieving both display and touch input capabilities.
2Adaptability or versatility
If the touch screen panel is provided on the front face of the LCD, then the touch input function is achieved, but the durability is reduced
Solution Approach 1:
The patent combines the touch screen panel with the LCD structure by forming all touch-related components (sensing patterns, color filters, common electrode) on the upper substrate of the LCD. This integration eliminates separate interfaces and bonding layers between distinct panels, reducing potential failure points and improving overall durability.
3Adaptability or versatility
If the touch screen panel is provided on the front face of the LCD, then the touch input function is achieved, but the touch sensitivity is reduced
Solution Approach 1:
The patent integrates the sensing patterns directly on the upper substrate of the LCD, eliminating intermediate layers and structures that would be present in a separate front-face touch panel. This direct integration reduces the number of interfaces and potential signal loss points, thereby improving touch sensitivity and detection precision.
4Adaptability or versatility
If the touch screen panel is provided on the front face of the LCD, then the touch input function is achieved, but the manufacturing yield is reduced
Solution Approach 1:
The patent combines the manufacturing processes for the LCD and touch screen panel into a single integrated process. By forming the sensing patterns, color filters, and common electrode on the upper substrate in the same manufacturing line, the patent eliminates the need for separate fabrication and assembly steps, thereby improving manufacturing yield and reducing production complexity.
Data Source
AI summary
There is provided a liquid crystal display (LCD) with a built-in touch screen panel in which the touch screen panel is built-in the LCD. The LCD with the built-in touch screen panel includes a lower substrate on whose upper surface a pixel electrode is formed, an upper substrate on whose bottom surface facing the lower substrate sensing patterns, color filters, and a common electrode are sequentially formed, and a liquid crystal layer interposed between the lower substrate and the upper substrate.