Semiconductor Touch Drive Circuit Noise Isolation
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Solution Overview
Problem
In semiconductor devices with integrated display and touch panel controllers, the existing technologies face challenges in preventing exogenous noise from mixing into the common voltage when connected to on-cell type panels, leading to potential image quality deterioration.
Innovation Solution
The semiconductor device incorporates a touch detection signal drive circuit that outputs a signal level based on the common voltage for in-cell type panels and a voltage level other than the common voltage for on-cell type panels, using internal and external power supplies to manage noise and voltage levels effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the touch detection signal drive circuit outputs a signal level based on the common voltage to the touch panel, then the circuit complexity is reduced and power consumption is lowered, but exogenous noise mixes into the common voltage causing image quality deterioration in on-cell type panels
Solution Approach 1:
The touch detection signal drive circuit dynamically switches between two operating modes: using common voltage for in-cell type panels and using a separate voltage level for on-cell type panels. This dynamic adaptation allows the circuit to optimize performance for each panel type, avoiding noise contamination while maintaining simplicity where applicable.
Solution Approach 2:
The circuit changes the voltage level parameter based on the panel type detection. When an on-cell type panel is detected, the circuit switches from using common voltage to using a different voltage level for touch detection signals, thereby preventing noise from mixing into the common voltage and degrading image quality.
2Object-affected harmful factors
If a separate voltage level other than common voltage is used for touch detection in on-cell type panels, then noise contamination is prevented, but the device complexity and power consumption increase
Solution Approach 1:
The touch detection signal drive circuit is designed with multi-functionality to handle both in-cell and on-cell type panels. By integrating the capability to use either common voltage or a separate voltage level within the same circuit, the design avoids the need for completely separate circuits for different panel types, thereby limiting the increase in device complexity.
3Adaptability or versatility
If the semiconductor device is designed to support both in-cell and on-cell type panels, then the adaptability is improved, but the device complexity increases due to multiple voltage routing configurations
Solution Approach 1:
The voltage routing configuration is made dynamic rather than static. The circuit can switch between different voltage routing modes (common voltage for in-cell, separate voltage for on-cell) based on the detected panel type. This dynamic approach allows the device to support multiple panel types without requiring permanently configured complex routing for all possibilities.
Data Source
AI summary
A display signal drive circuit is configured to output a display signal having a signal level based on a common voltage to a display panel. A touch detection signal drive circuit is configured to output a touch detection signal having a signal level based on the common voltage to a touch panel in case that a composite panel is an in-cell type, and is configured to output a touch detection signal having a signal level based on a voltage level other than the common voltage to the touch panel in case that the composite panel is an on-cell type.