Touch Panel Integrated LCD Substrate Merging
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Solution Overview
Problem
Conventional touch panel-integrated liquid crystal display devices require multiple substrates and complex connections, leading to increased thickness, size, and labor-intensive mounting processes due to separate formation and adhesion of touch and liquid crystal panels, which hinders circuit integration and simplification.
Innovation Solution
A touch panel-integrated liquid crystal display device where the touch panel is formed on the outer surface of a substrate, with electrodes and routing lines directly integrated on the same substrate, using chip-on-film and flexible printed cables to connect to the printed circuit board, eliminating the need for additional substrates and simplifying the connection process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the touch panel and liquid crystal panel are formed separately and adhered together, then the touch panel can be integrated with the liquid crystal display, but the total number of substrates increases and the device thickness increases
Solution Approach 1:
The patent merges the touch panel and liquid crystal panel into a single integrated structure where the touch panel is formed directly on the outer surface of the liquid crystal panel's second substrate. This eliminates the need for separate substrate formation and adhesion processes, reducing the total number of substrates from multiple separate components to a unified integrated panel structure.
Solution Approach 2:
The second substrate of the liquid crystal panel serves dual functions: as the rear substrate of the liquid crystal display and as the base substrate for forming the touch panel. This multi-functionality eliminates the need for a separate substrate for the touch panel, thereby reducing device complexity while maintaining touch functionality.
2Adaptability or versatility
If the touch panel and liquid crystal panel are formed separately and adhered together, then the touch panel can be integrated with the liquid crystal display, but the device size increases
Solution Approach 1:
By combining the touch panel and liquid crystal panel into a single integrated structure, the patent eliminates the cumulative volume occupied by separate substrates and adhesive layers. The touch panel electrodes and routing lines are formed directly on the second substrate, removing the need for additional substrate volume and reducing overall device size.
3Adaptability or versatility
If the touch panel and liquid crystal panel are formed separately, then the touch panel can be integrated with the liquid crystal display, but the mounting process becomes labor-intensive
Solution Approach 1:
The touch panel electrodes and routing lines are formed directly on the second substrate during the liquid crystal panel fabrication process. This preliminary integration eliminates subsequent separate mounting operations, as the touch panel components are already in place before the liquid crystal panel assembly is completed.
Solution Approach 2:
The patent combines the manufacturing processes of the touch panel and liquid crystal panel into a single integrated fabrication sequence. By forming touch panel electrodes and routing lines on the second substrate during liquid crystal panel assembly, the process eliminates separate mounting steps and reduces labor intensity.
4Ease of manufacture
If separate substrates are used for touch and liquid crystal panels, then the panels can be independently formed, but the connection between driving portions becomes complex
Solution Approach 1:
The second substrate serves as a universal platform that accommodates both liquid crystal panel components and touch panel driving circuits. By forming touch panel electrodes and routing lines directly on the second substrate, the patent creates a unified electrical connection architecture that simplifies the connection between driving portions while maintaining independent panel formation capabilities.
Data Source
AI summary
A liquid crystal display device includes a liquid crystal panel comprising a first substrate and a second substrate, a seal pattern arranged in the edge provided between the first and second substrates, and a liquid crystal layer, a plurality of first electrodes and second electrodes crossing each other and arranged in the seal pattern on an outer surface of the second substrate, a pad electrode for the touch panel partially overlapping the seal pattern on the outer surface of the second substrate, a pad electrode for the liquid crystal panel arranged at the outside of the seal pattern on the first substrate, a chip-on-film (COF) connected to the pad electrode for the liquid crystal panel, a printed circuit board for driving the liquid crystal panel, connected to the chip-on-film, a routing line to connect the pad electrode for the touch panel to the first electrodes and the second electrodes on the outer surface of the second substrate, and a flexible printed cable connected to pad electrodes for the touch panel, to receive driving signals of the first and second electrodes, the flexible printed cable connected to the printed circuit board.