Integrated Display Driver IC Touch Sensing
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Solution Overview
Problem
Existing display devices with integrated touch screens require separate touch ICs and circuit blocks for high-voltage driving, leading to increased size and manufacturing costs due to the need for a separate touch IC and additional circuitry for touch sensing.
Innovation Solution
Incorporating a display driver IC that can switch common voltage and generate gate high voltage, eliminating the need for a separate touch IC by using the display driver IC's gate high voltage for touch sensing, thereby integrating touch and display functions within a single IC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate touch IC and high-voltage circuit block are used for touch sensing, then touch sensitivity is improved, but device size and manufacturing complexity increase
Solution Approach 1:
The patent merges the touch IC and display driver IC into a single integrated circuit. The display driver IC internally includes both the display driving circuit and the touch sensing circuit, eliminating the need for separate ICs. This integration maintains touch sensing functionality while reducing device complexity and the number of components.
Solution Approach 2:
The display driver IC is designed to perform multiple functions: it drives the display panel and simultaneously performs touch sensing operations. The IC includes both display driving circuits and touch sensing circuits that can operate independently or in coordination, allowing a single IC to replace what would traditionally require separate specialized ICs.
2Adaptability or versatility
If a separate touch IC is manufactured for touch functions, then touch functionality is achieved, but manufacturing cost and device size increase
Solution Approach 1:
The patent combines the touch sensing functionality with the display driving functionality in a single integrated circuit. By merging these previously separate functions into one IC, the patent reduces the total number of components that need to be manufactured and assembled, thereby reducing manufacturing cost and simplifying the production process.
Solution Approach 2:
The integrated display driver IC is designed with multi-functionality, serving both as a display driver and a touch sensor controller. This universal design eliminates the need for separate specialized ICs, reducing the bill of materials and associated manufacturing complexities.
3Ease of operation
If separate FPCs are used for touch IC and display driver IC, then connection flexibility is maintained, but device complexity and assembly difficulty increase
Solution Approach 1:
The patent merges the touch IC and display driver IC into a single integrated circuit, which eliminates the need for multiple FPC connections. Instead of requiring separate FPCs to connect different ICs, the integrated design reduces the connection infrastructure and simplifies the assembly process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces manufacturing costs and size by eliminating the need for a separate touch IC and high-voltage circuit block, enhancing touch sensitivity without increasing the device's complexity or size.
Implementation Method 1
a display driver integrated circuit (IC) (i) converting a first driving pulse into a second driving pulse with a gate high voltage Vgh
Implementation Method 2
a mutual capacitance to be generated between the touch driving area and the touch sensing area. Therefore, the related art display device measures the change of a mutual capacitance that occurs in touch
Data Source
AI summary
Disclosed is a display device with an integrated touch screen, including a touch screen comprising a plurality of driving electrodes and sensing electrodes built in a panel; a display driver integrated circuit (IC) (i) converting a first driving pulse into a second driving pulse with a gate high voltage Vgh, wherein the second driving pulse is applied to the driving electrodes when the panel operates in a touch driving mode, (ii) receiving a plurality of sensing signals from the sensing electrodes when the panel operates in a touch driving mode, and (iii) applying a common voltage to the driving electrodes and the sensing electrodes when the panel operates in a display driving mode; and a touch IC generating the first driving pulse, wherein the first driving pulse is applied to the display driver IC, and receiving the sensing signals from the display driver IC to detect a touch.