Display Device with Integrated Touch Electrode Voltage Balancing
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Solution Overview
Problem
Integrating touch technology with electro-optic display devices results in signal coupling and material interference, affecting pixel data and display quality.
Innovation Solution
Utilizing one electrode as a touch electrode and maintaining equal average voltage values between this electrode and another electrode during touch sensing periods to prevent fluctuations in DC potentials, thereby stabilizing the display medium layer and preventing interference with pixel voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch electrodes are configured on electro-optic display panels, then touch sensing function is achieved, but the display device becomes thicker
Solution Approach 1:
The patent merges the touch electrode function with existing display electrodes (common electrode or pixel electrode), integrating touch sensing capability into the display structure without adding separate touch electrode layers, thereby achieving touch functionality while maintaining thin display device profile
2Length of stationary object
If touch panel and electro-optic display panel are integrated, then device thickness is reduced, but signal coupling and material interference affect pixel data and display quality
Solution Approach 1:
The patent applies equipotentiality by setting the average voltage of the common electrode equal to the average voltage of the pixel electrode during touch sensing period. This voltage balancing approach prevents potential differences from causing signal coupling or material interference, thereby maintaining display quality while enabling integrated touch functionality
3Device complexity
If touch sensing is performed using display electrodes, then device structure is simplified, but DC potential fluctuations may cause display medium layer to adjust display state
Solution Approach 1:
The patent maintains stability by ensuring the average voltage of the common electrode equals the average voltage of the pixel electrode during touch sensing. This equipotential condition prevents DC potential fluctuations that would otherwise cause the display medium layer to adjust its display state, thereby maintaining display stability while using display electrodes for touch sensing
Data Source
AI summary
A display device and a driving method thereof are provided. The display device includes a first electrode, a second electrode, a display medium layer, and an electrode driver. The first electrode serves as a touch electrode. The display medium layer is configured between the first electrode and the second electrode. The electrode driver is coupled to the first electrode and drives the first electrode. During a touch sensing period, the electrode driver provides a touch driving signal to the first electrode, and the first electrode performs touch sensing based on the touch driving signal. During the touch sensing period, a first average voltage value of the first electrode is equal to a second average voltage value of the second electrode.