In-Cell Display Burn-In Prevention via Potential Stabilization
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Solution Overview
Problem
In-cell type display devices with touch detection functions face the issue of burn-in on the display screen when shifting from sleep mode to normal operation mode, which is not adequately addressed in existing capacitive touch panel technologies.
Innovation Solution
A display device with a touch detection function that includes a normal operation mode for image display and touch detection, and a sleep mode for touch detection without image display, utilizing a matrix of pixel electrodes, a drive electrode, a touch detection electrode, and a control device to apply voltages and signals for image display and touch detection, and a touch-detection controller to manage the transition between modes, preventing burn-in.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display device shifts from sleep mode to normal operation mode in an in-cell type configuration, then touch detection function is restored, but burn-in occurs on the display screen
Solution Approach 1:
The patent applies preliminary action by controlling the pixel electrodes to a predetermined potential (ground potential) before transitioning from sleep mode to normal operation mode. This preparatory step ensures that the liquid crystal molecules are in a neutral state before imaging resumes, preventing burn-in while maintaining touch detection functionality. The control device executes this potential stabilization as a preliminary measure before full display operation begins.
2Use of energy by moving object
If the display device operates in sleep mode to reduce power consumption, then energy savings are achieved, but the ability to perform image display is lost
Solution Approach 1:
The patent implements dynamics by enabling the display device to dynamically switch between sleep mode and normal operation mode based on operational needs. The control device manages this dynamic transition by controlling the pixel electrodes to predetermined potential during mode switching, allowing the system to adapt its functionality and power consumption levels appropriately while maintaining the capability to perform image display when required.
3Object-affected harmful factors
If the pixel electrodes are controlled to predetermined potential during sleep mode, then burn-in is prevented, but additional control complexity is introduced
Solution Approach 1:
The patent applies universality by designing the control device to perform multiple functions: it controls both the drive electrodes for touch detection and the pixel electrodes for display operation. By integrating these control functions into a single device, the patent reduces overall system complexity while still achieving burn-in prevention through predetermined potential control during mode transitions.
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
The solution effectively prevents burn-in on the display screen by stabilizing pixel electrode potentials during sleep mode and efficiently switching to normal operation mode when a touch is detected, reducing power consumption and improving response characteristics.
Implementation Method 1
a touch detection electrode that is arranged opposite to the drive electrode and forms a capacitance with the drive electrode
Data Source
AI summary
A display device with a touch detection function includes a control device that performs, in normal operation mode, image display control to exhibit an image display function of a display function layer based on an image signal and performs touch detection control; a touch detecting unit that detects, in the normal operation mode, a position of an object in proximity to or in contact with the touch detection electrode based on a detection signal transmitted from the touch detection electrode; and a touch-detection controller that detects, in sleep mode, the proximity of the object to or the contact thereof with the touch detection electrode. When the touch-detection controller detects the proximity of the object to or the contact thereof with the touch detection electrode in the sleep mode, the control device controls a pixel electrode to a predetermined potential, and thereafter supplies a touch drive signal to a drive electrode.