Display Panel Transmission Area Transmittance Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In display devices, it is challenging to improve the transmittance of the active area where a light-receiving device, such as a camera, is located, as the presence of pixels and wires in this area obstructs sufficient light incidence.
Innovation Solution
The display panel design includes a first insulating film that does not overlap with the transmission area, and a touch sensor layer with reduced wiring size, allowing for improved transmittance by strategically positioning the wiring and light-emitting devices to minimize obstruction in the transmission area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the light-receiving device is disposed in the active area, then the bezel size can be reduced, but the transmittance of the transmission area deteriorates due to obstruction by pixels and wires
Solution Approach 1:
The active area is divided into two distinct regions: a pixel area containing pixels and wiring for display functions, and a transmission area free of opaque structures for light reception. This segmentation allows the light-receiving device to be positioned in the active area while maintaining high transmittance in the transmission area, thus reducing bezel size without compromising light incidence.
Solution Approach 2:
Different regions of the active area are assigned different functional qualities: the pixel area has display functionality with pixels and wires, while the transmission area has optical transparency for light reception. This local differentiation enables the coexistence of display and light-receiving functions in the active area, resolving the contradiction between reduced bezel size and maintained transmittance.
2Reliability
If the first insulating film is positioned to overlap the transmission area, then the encapsulation and planarization functions are maintained, but the transmittance of the transmission area deteriorates
Solution Approach 1:
The first insulating film is extracted from the transmission area and repositioned to overlap only with the pixel area. This extraction maintains the encapsulation and planarization functions in the pixel area while eliminating the transmittance obstruction in the transmission area, thus resolving the contradiction between reliability and transmittance.
Solution Approach 2:
The positioning of the first insulating film is changed from a full-area coverage to a selective area coverage, transitioning from a two-dimensional uniform layer to a spatially differentiated structure that avoids the transmission area, thereby maintaining both encapsulation function and optical transmittance.
3Ease of operation
If the wiring area size is increased to accommodate touch sensor wiring, then the touch sensor functionality is ensured, but the transmittance of the transmission area deteriorates
Solution Approach 1:
The wiring is segmented into display wiring located in the pixel area and touch sensor wiring located in the transmission area. The touch sensor wiring in the transmission area uses transparent conductive materials, allowing touch functionality to be maintained while minimizing obstruction to light transmission, thus resolving the contradiction between ease of operation and transmittance.
4Manufacturing precision
If pixels and wires are densely arranged in the active area, then the display resolution is improved, but the space for light reception is reduced
Solution Approach 1:
The active area is segmented into a pixel area with high-density pixel and wiring arrangement for display resolution, and a transmission area with low-density or no opaque structures for light reception. This segmentation allows high display resolution to be achieved in the pixel area while preserving sufficient space for light reception in the transmission area.
Data Source
AI summary
A display panel includes an active area having a pixel area, a wiring area and a transmission area; a transistor layer located on the substrate and including a first display wiring and a second display wiring; a planarization layer located on the transistor layer; a light-emitting device layer located on the planarization layer and including a plurality of light-emitting devices; a first encapsulation layer located on the light-emitting device layer and including a first insulating film; and a touch sensor layer located on the first encapsulation layer and including a third display wiring and a fourth display wiring, wherein the first insulating film does not overlap with the transmission area, wherein the third display wiring is in contact with the first display wiring through a first contact hole, and wherein the fourth display wiring is in contact with the second display wiring through a second contact hole.