In-Cell Touch Cathode Layout for Uniform Light-Emitting Displays
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Solution Overview
Problem
In-cell screens exhibit poor display uniformity due to the integration of touch control functions.
Innovation Solution
A light-emitting assembly with a cathode module that includes first and second cathode units forming touch electrodes, connected by a first electrical connection unit that switches between connected and disconnected states to improve display uniformity and enable touch detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If touch control function is integrated into display (in-cell technology), then bezel width is reduced and device thickness is decreased, but display uniformity deteriorates
Solution Approach 1:
The cathode is divided into multiple independent cathode units, each corresponding to different touch electrode regions. This segmentation allows independent electrical connection control for display and touch detection functions, resolving the conflict between integrated design and display uniformity by enabling selective activation of different cathode regions based on operational mode.
Solution Approach 2:
The electrical connection between cathode units is made dynamic through switching mechanisms that can change connection states between display period and touch period. This dynamic reconfiguration allows the system to optimize electrical pathways for different operational modes, maintaining display uniformity while enabling touch detection functionality.
2Device complexity
If touch electrode and display electrode share same structure, then device complexity is reduced, but electrical connection control becomes difficult
Solution Approach 1:
The cathode structure serves dual functions as both display electrode and touch electrode through different electrical connection configurations. By making the same physical structure multi-functional with different connection states, the patent reduces overall device complexity while maintaining operational control through switching mechanisms that activate different functional modes.
Data Source
AI summary
A light-emitting assembly and a touch display screen are provided. The light-emitting assembly includes a first light-emitting device, a second light-emitting device, a first anode block, a second anode block, a first cathode block, and a second cathode block. Two adjacent first cathode blocks are electrically connected to each other. One first cathode block is electrically connected to one first light-emitting device. Two adjacent second cathode blocks are electrically connected to each other. One second cathode block is electrically connected to one second light-emitting device. Multiple first cathode blocks form a first touch electrode, and multiple second cathode blocks form a second touch electrode. A first electrical connection unit is electrically connected between the first touch electrode and the second touch electrode.