Partial Panel Display Touch Sensing Frequency
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Solution Overview
Problem
Conventional touch-screen integrated display devices have a touch sensing frequency of 60 Hz, which is insufficient for fast user interactions, as they perform touch sensing and pixel driving simultaneously within a limited time frame, limiting response speed.
Innovation Solution
The display device is divided into two or more panel portions, allowing for separate pixel display and touch sensing modes within a single frame period, increasing touch sensing frequency by driving different subsets of gate lines during distinct periods and using a 2H 4 phase signal scheme with reduced clock signals and end signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If touch sensing and pixel driving are performed simultaneously within one frame period, then the device structure remains simple, but the touch sensing frequency is limited to 60 Hz which is insufficient for fast user interactions
Solution Approach 1:
The display panel is divided into a first panel portion and a second panel portion, each with separate gate lines. The gate driver sequentially drives the first subset of gate lines during display mode, then the second subset during touch sensing mode, enabling independent control of display and touch functions to achieve higher touch sensing frequency
2Productivity
If the panel is divided into multiple portions with separate gate lines, then touch sensing frequency increases to 120 Hz, but the number of signal lines and bezel size may increase
Solution Approach 1:
The common electrode serves dual functions: it supplies common voltage to pixels during display mode and operates as a touch electrode during touch sensing mode. This multi-functionality eliminates the need for separate touch electrode signal lines, maintaining the same number of signal lines while achieving 120 Hz touch sensing frequency
3Loss of time
If separate display and touch modes are implemented within one frame period, then response speed improves, but the time available for each operation is reduced
Solution Approach 1:
The gate driver alternates between display mode and touch sensing mode in a periodic sequence within each frame period. The first panel portion displays during the first half of the frame, then the second panel portion displays during the second half, creating alternating periodic cycles that achieve faster overall response while maintaining adequate display duration
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 approach doubles the touch sensing frequency to 120 Hz, improving response speed while maintaining the same number of signal lines, thus preventing an increase in bezel size, and utilizing oxide TFTs with higher charge mobility for efficient operation.
Implementation Method 1
utilizing oxide TFTs with higher charge mobility for efficient operation
Data Source
AI summary
Disclosed are a display device comprising panel portions and a driving method thereof, which are capable of dividing the display panel into two or more panel portions and adding a touch mode between the display modes of each panel portion, thereby improving the frequency of the touch sensing or the touch report rate. The display device comprising panel portions and the driving method thereof can reduce the pulse width of the signals from 4H 8phase to 2H 4phase by using an oxide TFT and maintain or reduce the number of the signal lines applied to the gate driver of the partial display panel, thereby having the advantages in terms of the bezel.