Touch Display Compensation Electrodes for Luminance Stability
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Solution Overview
Problem
Noise in the sense signal affects the luminance of display devices with integrated touch sensors, leading to unwanted luminance changes.
Innovation Solution
Incorporating compensation electrodes that apply a compensation signal inverted in phase with the sense signal, arranged in a mesh pattern with sense electrodes, to neutralize noise and stabilize voltage at the pixel level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sense electrodes are integrated with the display panel to enable touch sensing, then touch input capability is improved, but noise in the sense signal causes unwanted luminance changes
Solution Approach 1:
A compensation electrode is introduced as an intermediary element between the sense electrode and the pixel electrode. This compensation electrode receives a compensation signal that is inverted in phase with the sense signal, and it neutralizes the noise-induced voltage changes at the pixel electrode, thereby preventing luminance changes while preserving touch sensing functionality.
Solution Approach 2:
The compensation signal is applied in advance to the compensation electrode with an inverted phase relative to the sense signal. This preliminary anti-action counteracts the noise before it can cause luminance changes in the display, effectively canceling out the harmful voltage fluctuations at the pixel electrode.
2Stability of the object's composition
If compensation electrodes are added to neutralize noise, then luminance stability is improved, but device structure becomes more complex
Solution Approach 1:
The compensation electrode is merged with the existing electrode structure of the display panel, sharing the same substrate and integration process. This combining approach adds the noise compensation functionality without requiring a completely separate system, thereby limiting the increase in device complexity.
3Reliability
If compensation signal is applied with inverted phase, then noise removal is improved, but signal interference risk increases
Solution Approach 1:
The compensation signal with inverted phase is applied locally at the compensation electrode and its immediate vicinity, rather than globally across the entire display. This localized application ensures that the phase-inverted signal only affects the noise cancellation at the pixel electrode without causing widespread signal interference across the display panel.
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 removes noise from the sense electrode operation, preventing luminance changes in the display device and ensuring stable pixel luminance.
Implementation Method 1
a compensation signal is applied to the compensation electrode, and the compensation signal and the first sense signal are inverted in phase
Data Source
AI summary
A display device according to an example embodiment includes a display portion displaying an image, and a sense portion that is disposed over one side of the display portion, and senses an external input, wherein the sense portion includes: at least one of first sense electrodes receiving a first sense signal that is changed in response to the external input, at least one of second sense electrodes that are disposed at a distance from the first sense electrodes, wherein the first sense electrodes are disposed between the second sense electrodes, and at least one of compensation electrode that are disposed spaced apart from and between the first sense electrodes, and to which a compensation signal is applied, wherein the compensation signal and the first sense signal are inverted in phase.