Touch Substrate Integration for Thin Display Signal Transmission
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Solution Overview
Problem
Existing embedded capacitive touch display panels face challenges in transmitting touch signals between integrated circuit (IC) chips and touch electrodes located on different substrates, particularly in achieving a thin and light design while ensuring reliability and cost-effectiveness.
Innovation Solution
The solution involves a display panel design with a light-emitting substrate and a touch substrate, where touch units, first touch lines, and first connection structures are arranged on the touch substrate facing the light-emitting substrate, and second connection structures on the light-emitting substrate facilitate touch signal transmission by electrical contact between the first and second connection structures, utilizing the same layer as the light-emitting substrate to enhance conductivity without additional manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch electrodes are disposed on a substrate opposite to the light-emitting substrate, then touch function can be achieved, but transmission of touch signals between IC chip and touch electrodes becomes complex
Solution Approach 1:
The patent combines the touch electrode layer with the light-emitting substrate by disposing touch electrodes on the same substrate as the light-emitting elements, rather than on a separate opposite substrate. This integration allows the IC chip to control both display and touch functions through the same substrate connections, simplifying signal transmission architecture.
Solution Approach 2:
The light-emitting substrate serves dual functions as both the display substrate and the touch electrode substrate. The same substrate that carries light-emitting elements also carries touch electrodes, enabling one substrate to perform multiple functions and reducing the need for separate signal transmission paths.
2Ease of manufacture
If one IC chip controls both display and touch functions, then cost is reduced, but reliable transmission of touch signals becomes challenging
Solution Approach 1:
The patent merges the touch electrode connections with the display substrate structure, allowing the IC chip to access both touch and display functions through the same substrate interface. This integration maintains signal transmission reliability by using the same proven substrate connection methods for both functions.
3Reliability
If additional manufacturing processes are added to enhance conductivity, then conductivity improves, but manufacturing complexity increases
Solution Approach 1:
The patent uses the same conductive material layer for both the light-emitting electrode and the touch electrode connections on the light-emitting substrate. This homogeneous approach ensures adequate conductivity for both functions without requiring additional specialized conductive layers or complex multi-step deposition processes.
Data Source
AI summary
Provided is a display panel including: a light-emitting substrate; and a touch substrate. The touch substrate includes: touch units, first touch lines, and first connection structures, all of which are arranged at a side of the touch substrate facing the light-emitting substrate. Each first touch line has one end electrically connected to one touch unit and another end electrically connected to one first connection structure. The light-emitting substrate includes: second connection structures disposed in a non-display area, corresponding to the first connection structures and arranged at a side of the light-emitting substrate facing the touch substrate; and a light-emitting layer disposed in a display area and including a first electrode, a second electrode, and an organic light-emitting layer. Each second connection structure includes a first secondary electrode in electrical contact with one first connection structure. The first secondary electrode and the first electrode are arranged in a same layer.