Integrated Touch Screen Bezel Width Reduction via Segmented Electrodes
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Solution Overview
Problem
In LCD devices with integrated touch screens, the formation of driving and receiving electrodes in non-display areas increases the bezel width, making it difficult to achieve a borderless or narrow bezel design, and complicates the manufacturing process.
Innovation Solution
The solution involves forming a plurality of driving electrode lines in only one non-display area and forming driving dummy lines at pixels covered by corresponding driving electrodes, without connection to the driving IC, to improve light transmittance and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If driving and receiving electrodes are formed in non-display areas to enable touch screen functionality, then touch screen capability is achieved, but bezel width increases
Solution Approach 1:
The touch screen electrodes are segmented into display area electrodes and non-display area electrodes. The non-display area electrodes are further divided into driving electrode lines extending from display electrodes and additional driving electrodes positioned in non-display areas. This segmentation allows the touch functionality to be achieved while confining non-display electrodes to specific regions, thereby controlling bezel width increase.
Solution Approach 2:
Different regions of the panel are assigned different functions: the display area contains both display and touch electrodes, while non-display areas contain only necessary driving electrodes for touch functionality. This local differentiation ensures that touch capability is maintained where needed while minimizing the impact on display quality and bezel width in other regions.
2Reliability
If multiple lines are formed in non-display areas to connect electrodes, then electrode connectivity is achieved, but manufacturing complexity increases
Solution Approach 1:
The driving electrode lines extending from display area electrodes are merged with additional driving electrodes positioned in non-display areas. These merged structures are collectively connected to the same terminal electrode, reducing the number of separate connection lines needed and simplifying the manufacturing process while maintaining reliable electrode connectivity.
3Reliability
If driving electrode lines extend from display area to non-display area, then electrode connection is achieved, but light transmittance uniformity deteriorates
Solution Approach 1:
The problematic driving electrode lines that would traverse the display area and disrupt light transmittance uniformity are extracted and repositioned to extend only within non-display areas. This extraction eliminates their interference with display quality while maintaining their essential function of connecting touch electrodes to terminals.
Data Source
AI summary
Disclosed is a display device with integrated touch screen. The display device includes a plurality of receiving electrodes formed in a block type and in parallel with a plurality of data lines, a driving electrode group configured to include a plurality of driving electrodes that are respectively disposed between the plurality of receiving electrodes, a plurality of receiving electrode lines respectively connected to the plurality of receiving electrodes, a plurality of driving electrode lines configured to extend from the respective driving electrodes to the first non-display area, a driving IC configured to apply a common voltage or a driving pulse to the plurality of receiving electrode lines and the plurality of driving electrode lines, and a plurality of driving dummy lines formed at a plurality of pixels, covered by a corresponding driving electrode, in a direction parallel to the plurality of driving electrode lines.