Touch Substrate With Overlapping Touch And Light Emitting Units
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Solution Overview
Problem
Existing OLED display structures face a decrease in aperture ratio and resolution due to the separate fabrication of touch function devices, which limits their performance when integrated with touch screens.
Innovation Solution
A touch substrate is designed with touch units and light emitting units where their projections overlap on the substrate, allowing touch units to be prepared first, followed by light emitting units, enhancing the aperture ratio and resolution without affecting display functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If touch function devices are fabricated separately from OLED display structures, then manufacturing process simplicity is maintained, but aperture ratio and resolution decrease
Solution Approach 1:
The patent combines the touch function device fabrication with the OLED display structure fabrication into a single integrated process. The touch sensor electrodes, insulation layers, and OLED components are formed simultaneously on the same substrate through coordinated patterning and deposition steps, eliminating the need for separate fabrication processes while achieving high aperture ratios and resolutions.
Solution Approach 2:
The patent utilizes vertical layering to resolve the contradiction by stacking touch sensor components and OLED components in different vertical layers on the same substrate. This three-dimensional integration allows both touch functionality and high-resolution display to coexist without interfering with each other's lateral space requirements, thereby maintaining high aperture ratios.
2Measurement precision
If touch units and light emitting units are fabricated separately, then device functionality is ensured, but resolution and touch precision are limited
Solution Approach 1:
The patent segments the device into distinct functional layers: touch sensor electrodes in lower layers and OLED light-emitting structures in upper layers. Each layer is independently patterned and optimized for its specific function, allowing high-precision touch detection in the sensor layers while maintaining ease of manufacture through standardized OLED fabrication processes for the display layers.
Solution Approach 2:
The patent introduces insulation layers and intermediate structural elements that mediate between the touch sensor units and light emitting units. These intermediary layers provide electrical isolation, mechanical support, and process compatibility, enabling both high touch precision and simplified fabrication by allowing independent optimization of each functional component.
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
This approach improves the aperture ratio and resolution of OLED displays by allowing the touch units and light emitting units to overlap, facilitating better touch precision and display uniformity while reducing manufacturing complexity and cost.
Implementation Method 1
a photosensitive device including a second electrode, a photosensitive layer and a first electrode disposed successively on the substrate
Data Source
AI summary
A touch substrate and a display device. The touch substrate includes a substrate; and a touch unit and a light emitting unit disposed on the substrate successively. An orthographic projection of the touch unit and that of the light emitting unit on the substrate at least partially overlap.