Uneven PI Substrate for Camera Under Panel Light Transmission
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Solution Overview
Problem
The existing OLED display devices with camera under panel (CUP) technology face significant light loss due to total reflection at the interface between the polyimide (PI) substrate and air, resulting in reduced light output and compromised camera clarity.
Innovation Solution
A display panel with a polyimide substrate featuring an uneven structure, comprising a first and second PI film layer with different refractive indices and protrusion structures, is designed to refract incident light rays, altering their direction and increasing the critical angle of total reflection, thereby enhancing light transmission and reception by the camera.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the thickness of the PI film layer above the camera is reduced to increase light transmittance, then light transmittance in this area is increased and light received by the camera is increased, but total reflection at the interface between the PI substrate and air occurs, resulting in that the light cannot pass through the display panel and the light received by the camera is greatly reduced
Solution Approach 1:
The patent introduces an uneven structure (intermediary element) at the interface between the PI substrate and air to mediate the optical transition. This uneven structure acts as an intermediate zone that gradually transitions the refractive index from the dense PI medium to the sparse air medium, preventing abrupt total reflection and enabling light to pass through to the camera.
2Productivity
If the PI film layer thickness is greatly reduced to allow light to pass through the PI substrate to the camera, then light transmittance is increased, but total reflection at the interface between the PI substrate and air occurs, resulting in that the light cannot pass through the display panel
Solution Approach 1:
The patent transitions from a one-dimensional flat interface to a three-dimensional uneven structure at the PI substrate-air interface. This dimensional change creates multiple refraction paths and angles, allowing light to escape total reflection by changing its incident angle at different locations of the uneven structure, thereby improving both light output rate and transmission reliability.
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
The uneven structure within or on the PI substrate increases light output from the display panel, improving camera clarity by reducing total reflection and allowing more light to be received, thus enhancing imaging performance.
Implementation Method 1
refractive indexes of different film layers are different, so light radiated to this area from outside is refracted and reflected between the film layers
Implementation Method 2
a process of light entering from a dense medium into a sparse medium will cause total reflection at an interface between the PI substrate and the air
Data Source
AI summary
The present invention provides a display panel and a display device. The display panel includes a transparent substrate and a polyimide (PI) substrate. The PI substrate is placed at one side of the transparent substrate. An uneven structure is provided inside the PI substrate or arranged on one side of the PI substrate facing the transparent substrate.