Touch Drive Line Routing for Reduced Bezel Width
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Solution Overview
Problem
The existing display devices with integrated touch screens face challenges in reducing bezel width due to the routing of touch drive lines in non-display areas, which also lead to issues like light leakage and block dim phenomena caused by coupling capacitance and positioning of touch sensing lines.
Innovation Solution
The solution involves rearranging the touch drive lines on the lower substrate in the same direction as data lines and forming touch sensing lines on the upper substrate in the same direction as gate lines, allowing for a decrease in bezel width while maintaining picture quality and preventing block dim phenomena.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the touch drive line is routed in the non-display area vertically, then the touch sensing function is achieved, but the bezel width increases
Solution Approach 1:
The patent changes the routing direction of the touch drive line from vertical (in non-display area) to horizontal (within display area), utilizing the horizontal dimension to connect touch blocks. This dimensional change allows the drive line to be positioned within the display area rather than extending into the bezel, thereby reducing bezel width while maintaining touch sensing functionality.
Solution Approach 2:
The patent merges the touch drive line routing with the data line routing by positioning both in the same horizontal direction within the display area. This merging allows the touch drive line to share the horizontal space with data lines, eliminating the need for separate vertical routing in the non-display area and thus reducing bezel width.
2Measurement precision
If the touch sensing line is positioned among the touch drive lines, then the touch position sensing is enabled, but the block dim phenomenon occurs
Solution Approach 1:
The patent segments the display area into distinct driving regions and sensing regions by positioning touch sensing lines in the non-display area rather than among the touch drive lines. This segmentation prevents the coupling capacitance between adjacent lines that causes block dim, while still enabling touch position sensing through the separated sensing lines.
Solution Approach 2:
The patent extracts the touch sensing line positioning from the display area and places it in the non-display area. By taking out the sensing lines from among the drive lines, the harmful coupling capacitance effect is eliminated, preventing block dim phenomenon while maintaining the ability to sense touch positions through the extracted sensing lines.
3Length of stationary object
If the touch drive line and data line are routed in the same direction, then the bezel width is reduced, but the coupling capacitance increases
Solution Approach 1:
The patent applies local quality by positioning touch sensing lines in the non-display area where they do not interfere with data lines in the display area. This localized placement of sensing lines eliminates coupling capacitance issues in the display region while still allowing the touch drive lines and data lines to be routed in the same horizontal direction within the display area, thus reducing bezel width.
Data Source
AI summary
Disclosed is a display device integrated with a touch screen which realizes good design by decreasing a bezel width, and its driving method, wherein the device comprises a plurality of gate and data lines crossing each other on a lower substrate of a display panel; a common electrode formed in each of touch blocks, wherein the plurality of touch blocks are formed by grouping all pixels into units; a plurality of touch drive lines on the lower substrate of the display panel, wherein the touch drive line is provided in the same direction as that of the data line; and a plurality of touch sensing lines on an upper substrate of the display panel, wherein the touch sensing line is formed in the same direction as that of the gate line.