Matrix-Wired Display Panel for Touch Sensing Without Flicker
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Solution Overview
Problem
Existing display devices face challenges in efficiently driving and integrating touch sensing without separate touch sensor structures, leading to unwanted emissions and flicker phenomena during voltage changes, especially in low-grayscale images, and require multiple drivers.
Innovation Solution
A display device with a matrix-form wiring structure using column and row lines for both display and touch sensing, where row lines act as common electrodes, minimizing voltage differences and eliminating the need for separate touch sensor structures, thereby reducing unwanted emissions and flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate touch sensor structures are added to display devices, then touch sensing capability is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The row lines are designed to serve dual functions: acting as common electrodes for displaying images and as touch sensor electrodes for detecting touch input. This multi-functionality eliminates the need for separate touch sensor structures, reducing device complexity while maintaining both display and touch sensing capabilities
Solution Approach 2:
The display electrode structure and touch sensor electrode structure are merged into a single row line structure. By combining these two functions into one component, the patent reduces the number of parts and simplifies the overall device structure without compromising functionality
2Device complexity
If row lines are used as both common electrodes and touch sensors, then device complexity is reduced, but unwanted emissions and flicker phenomena occur during voltage changes
Solution Approach 1:
Before switching between display driving and touch driving modes, the system performs preliminary voltage adjustment on the row lines. During the transition period, intermediate voltage levels are applied to prevent sudden voltage changes that would cause unwanted emissions and flicker in the light emitting devices
Solution Approach 2:
The patent implements periodic voltage adjustment cycles when switching between display and touch modes. By using controlled periodic voltage transitions rather than instantaneous switches, the system minimizes harmful emissions and flicker phenomena while maintaining the dual-function architecture
3Productivity
If multiple drivers are used to control column and row lines, then light emitting devices are driven efficiently, but the number of driving components connected to the display panel increases
Solution Approach 1:
Multiple driver functions are merged into integrated driver circuits that can control both column lines and row lines. This consolidation reduces the total number of separate driver components connected to the display panel while maintaining efficient control of all light emitting devices
Data Source
AI summary
A display device may include a substrate including a display area, a plurality of pixels in the display area and including a plurality of light emitting devices, a plurality of column lines electrically connected to a first electrode of each of the light emitting devices, a plurality of row lines electrically connected to a second electrode of each of the light emitting devices, and a plurality of drivers on the substrate and in the display area, and configured to drive the light emitting devices, the plurality of column lines and the plurality of row lines. During a touch sensing period, a voltage difference between at least one touch driving row line and at least one column line may be less than a threshold voltage of at least one light emitting device connected between the at least one touch driving row line and the at least one column line.