Touch Display Panel Demux Circuit Layout for Narrow Frame
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Solution Overview
Problem
Conventional touch display panels with self-capacitance touch structures face challenges in achieving a narrow frame design due to the increased lateral size caused by the demux circuit, which is necessary to manage the higher number of touch wirings.
Innovation Solution
The touch display panel incorporates a demux circuit with first control units arranged in multiple rows, where adjacent units overlap partially, and signal transmission lines, allowing touch wirings to share channel wirings, thereby reducing the lateral size of the demux circuit and enabling narrower frame designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a demux circuit is used to manage the higher number of touch wirings in self-capacitance touch structure, then the touch function performance is improved, but the lateral size of the display panel increases
Solution Approach 1:
The patent transitions from a conventional single-row arrangement of control units to a multi-row arrangement where control units are distributed across multiple rows in the second direction (row direction). This dimensional change allows the circuit to utilize the row direction for signal transmission, effectively reducing the lateral size in the column direction while maintaining the necessary connectivity for managing multiple touch wirings.
Solution Approach 2:
The demux circuit is segmented into multiple rows, with each row containing multiple control units. This segmentation allows the circuit to process multiple touch wirings simultaneously across different rows, improving the management efficiency of the increased number of touch wirings while distributing the spatial requirements across both row and column directions, thereby reducing the overall lateral footprint.
2Measurement precision
If the number of touch wirings is increased to achieve self-capacitance touch, then the touch sensitivity and performance are improved, but the demux circuit lateral size increases
Solution Approach 1:
The patent introduces a second direction (row direction) for arranging control units and transmitting signals. By utilizing this additional dimension, the circuit can accommodate more control units without proportionally increasing the lateral size in the column direction. This allows for increased touch wiring capacity and improved touch sensitivity while keeping the demux circuit footprint compact.
Solution Approach 2:
Multiple control units arranged in different rows can share common channel wirings in the column direction. This merging approach allows the circuit to manage a larger number of touch wirings through shared resources, improving touch sensitivity and wiring capacity while reducing the overall lateral size by eliminating redundant separate pathways.
Data Source
AI summary
The present application provides a touch display panel and a display device. In the touch display panel, the first channel wirings are arranged in in a first direction, each of the first channel wirings is electrically connected to at least one of the first control units, each of the first control units is electrically connected to a corresponding one of the touch wirings. The first control units are arranged in at least two rows in a second direction. In the first direction, adjacent two of the first control units in adjacent ones of some of the rows at least partially overlap each other.