P-Type Transistor Touch Screen Programmable Voltage Control
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Solution Overview
Problem
Existing touch screens face challenges in reducing power consumption and IC size due to high manufacturing voltages and complex control signal management, particularly with the use of multiple voltage sources and signal lines for sensor switches.
Innovation Solution
A touch screen configuration utilizing P-type transistors and tri-state buffers to control sensor switches and MUXs, where the touch drive IC supplies programmable voltages directly, reducing the number of signal lines and enabling efficient low-voltage switching, thereby decreasing power consumption and IC size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple voltage sources and signal lines are used for sensor switches, then the touch screen can perform sensing and driving operations, but power consumption increases and IC size increases
Solution Approach 1:
The patent applies parameter changes by using a single voltage source that can be programmed to output different voltage levels (first voltage for sensing, second voltage for driving) instead of multiple fixed voltage sources. The touch drive IC changes the voltage parameter dynamically based on operation mode, reducing power consumption while maintaining reliable touch detection performance.
Solution Approach 2:
The patent implements universality by designing a single voltage source that performs multiple functions - it serves as both the sensing voltage source and the driving voltage source by changing its output voltage level. This multi-functional voltage source replaces multiple dedicated voltage sources, reducing overall power consumption while maintaining all necessary operations.
2Reliability
If multiple voltage sources and signal lines are used for sensor switches, then the touch screen can perform sensing and driving operations, but the number of signal lines increases and IC size increases
Solution Approach 1:
The patent merges multiple signal lines into a single voltage signal line by combining the functions of multiple voltage sources into one programmable voltage source. This consolidation reduces the number of signal lines connecting the touch drive IC to the sensor switches, simplifying the overall device structure while maintaining reliable touch detection performance.
Solution Approach 2:
The single voltage source is designed to be universal, performing both sensing and driving functions that previously required separate dedicated sources. This multi-functionality eliminates the need for multiple separate signal lines, reducing IC size and signal line complexity while preserving all necessary operational capabilities.
3Ease of manufacture
If high manufacturing voltages are used, then the transistor can be manufactured with standard processes, but power consumption increases
Solution Approach 1:
The patent applies parameter changes by using a programmable voltage source that outputs low voltage levels (0V to +Vcc) during operation, compared to high manufacturing voltages used during fabrication. This separation of manufacturing voltage (high) from operating voltage (low) allows standard manufacturing processes while achieving low power consumption during actual device operation.
Data Source
AI summary
An object of the present invention is to efficiently reduce the number of signal lines of a control port and an input port of a sensor switch required for controlling a touch by supplying a programmable voltage from a touch drive IC TDI, not a separate external voltage source, as a voltage applied to a touch sensor. The present invention provides a touch screen which is capable of implementing low power consumption, low-resistance signal wiring, touch IC price reduction, and the like by forming a switching transistor of the sensor switch only with a P-type transistor manufactured in a Low Temperature Poly Silicon (LTPS) process, and driving the switching transistor without using a negative voltage (−V).