Non-Planar Electrode Structure for Low-Reflectivity Display Openings
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Solution Overview
Problem
In color filter on thin film encapsulation (CFOT) display panels, light-transmitting holes in the black matrix layer can expose highly reflective cathodes, leading to increased reflectivity and deterioration of display effects due to reflected light.
Innovation Solution
A display panel design featuring a non-planar surface on the first electrode layer that overlaps with light-transmitting holes, redirecting ambient light to be absorbed by the black matrix layer, thereby reducing reflected light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If light-transmitting holes are set in the black matrix layer to cooperate with optical fingerprint or ambient light sensor, then the display panel can achieve fingerprint detection or ambient light sensing function, but the highly reflective cathode is exposed and damaged, causing increased reflectivity and deterioration of display effect
Solution Approach 1:
The patent introduces an intermediate structure (the first component with non-planar surface) between the light-transmitting hole and the cathode. This intermediate structure serves as a mediator that allows light to pass through for fingerprint detection while preventing direct exposure and reflection from the cathode, thus resolving the contradiction between functionality and reflectivity control
Solution Approach 2:
The patent changes the surface geometry of the first component from planar to non-planar, creating a three-dimensional structure that redirects light paths. This dimensional change allows light to pass through the opening while reflecting it in different directions, preventing direct reflection back to the viewer and reducing the harmful reflectivity effect
2Adaptability or versatility
If light-transmitting holes are set in the black matrix layer, then optical fingerprint or ambient light sensor function is enabled, but the display uniformity deteriorates due to reflected light from the exposed cathode
Solution Approach 1:
The first component with non-planar surface acts as an intermediary that enables ambient light sensing through the opening while simultaneously preventing direct reflection from the cathode, thus maintaining display uniformity. The intermediary structure allows the sensing function to operate without compromising the visual uniformity of the display
Solution Approach 2:
By introducing a non-planar surface geometry, the patent creates additional light paths in three-dimensional space. This allows ambient light to pass through for sensing purposes while redirecting reflected light away from the direct viewing angle, thereby preserving display uniformity despite the presence of the opening
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 design improves display uniformity by reducing the impact of reflected light on the display panel's overall performance, enhancing user experience by minimizing light emission from the holes.
Implementation Method 1
the first electrode layer includes first components. One first component overlaps a corresponding first opening; and a surface of the first component is a non-planar surface
Data Source
AI summary
A display panel and a display device are provided. The display panel includes: a substrate; a planarization layer on a side of the substrate; a pixel definition layer on a side of the planarization layer away from the substrate; a first electrode layer on a side of the pixel definition layer away from the planarization layer; and a black matrix layer on a side of the first electrode layer away from the pixel definition layer. The black matrix layer is provided with first openings. The first electrode layer is provided with first components. One first component overlaps one corresponding first opening; and a surface of one first component is a non-planar surface.