Touch Driver Circuit Signal Distortion Reduction
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Solution Overview
Problem
In-cell touch display devices experience signal distortion due to line resistance, which degrades touch sensing performance and increases manufacturing costs due to the need for multiple pads and lines on the printed circuit board.
Innovation Solution
A touch driver circuit with an active gamma voltage generation block, a switching block, and a common voltage modulation block that generates and outputs reference gamma voltages and touch driving voltages through a shared path, reducing the number of pads and lines required, and embedding the common voltage modulation block in the source-readout integrated circuit to minimize signal distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the common voltage modulation signal is supplied to the SRIC via a PCB, then the touch driving function can be implemented, but signal distortion occurs due to line resistance
Solution Approach 1:
The patent merges the common voltage modulation block into the SRIC, combining previously separate functions (TPIC generating modulation signal and SRIC receiving it) into a single integrated circuit. This eliminates the PCB transmission path and associated line resistance, thereby resolving the signal distortion issue while maintaining touch driving functionality.
Solution Approach 2:
The patent extracts the common voltage modulation function from the TPIC and relocates it directly into the SRIC. This extraction removes the harmful PCB transmission path from the signal chain, eliminating the source of signal distortion caused by line resistance.
2Adaptability or versatility
If multiple pads and lines are used on the PCB for touch driving signals, then complete touch functionality is achieved, but manufacturing costs increase
Solution Approach 1:
The patent merges multiple touch driving functions into a single SRIC chip, eliminating the need for separate PCB traces and pads for common voltage modulation signals. This integration reduces the number of required PCB connections, simplifying manufacturing and reducing costs while maintaining complete touch functionality.
Solution Approach 2:
The SRIC is designed with multi-functionality, serving both as a source driver and as a common voltage modulation generator. This universal design eliminates the need for separate dedicated hardware components and PCB routing for touch driving functions, thereby reducing manufacturing complexity and cost.
Data Source
AI summary
The present disclosure relates to a touch driver circuit capable of reducing the distortion of a common voltage modulation signal caused by line resistance. The touch driver circuit may include a touch power integrated circuit configured to generate a reference gamma voltage set to output the reference gamma voltage set through a gamma transmission path during a display period, and generate a touch driving voltage to output the touch driving voltage through the gamma transmission path during a touch period, and a source-readout integrated circuit configured to drive a source driving circuit block using the reference gamma voltage set during the display period, and generate a common voltage modulation signal using the touch driving voltage to drive a readout circuit block using the generated common voltage modulation signal during the touch period.