Variable Reflectivity Unit for OLED Ambient Light Management
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Solution Overview
Problem
Ambient light interference disrupts image clarity in OLED display panels, as existing solutions like polarizers either block display light or fail to effectively manage high ambient light conditions.
Innovation Solution
A light-emitting structure with a transparent first electrode and a variable reflectivity unit comprising a piezoelectric structure and a liquid reflective material, where the thickness of the liquid material is adjustable to control reflectivity based on ambient light intensity, allowing for adaptive absorption or reflection of ambient light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polarizer is disposed on the second electrode to block ambient light reflection, then ambient light interference is reduced, but display light transmission is blocked and light-emitting efficiency decreases
Solution Approach 1:
The patent applies a variable reflectivity unit with adjustable reflectivity instead of a static polarizer. The reflectivity of the first electrode can be dynamically adjusted based on ambient light conditions, allowing it to reflect ambient light when needed while transmitting display light when required, thus resolving the contradiction between blocking harmful ambient light and preserving useful display light
Solution Approach 2:
The patent changes the reflectivity parameter of the first electrode from fixed to variable. By controlling the reflectivity parameter of the first electrode through the variable reflectivity unit, the system can adapt to different ambient light conditions, blocking ambient light reflection when ambient light is strong while allowing display light transmission when ambient light is weak, thereby resolving the contradiction between reducing ambient light interference and maintaining light-emitting efficiency
2Object-affected harmful factors
If a total reflection layer (metal material) is used as the first electrode to reflect ambient light, then ambient light reflection is strong, but display light transmission is blocked
Solution Approach 1:
The patent replaces the static total reflection layer with a variable reflectivity unit that can dynamically adjust its reflectivity. This allows the first electrode to switch between reflecting ambient light and transmitting display light based on ambient light conditions, resolving the contradiction between strong ambient light reflection and display light transmission
Solution Approach 2:
The patent changes the reflectivity parameter of the first electrode from fixed (total reflection) to variable. By controlling the reflectivity parameter through the variable reflectivity unit, the system can adjust the first electrode's reflectivity to be high when ambient light is strong and low when ambient light is weak, thereby resolving the contradiction between ambient light reflection and display light transmission
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
Improves user viewing experience by minimizing ambient light interference while enhancing light extraction efficiency, maintaining image clarity under varying light conditions.
Implementation Method 1
the variable reflectivity unit comprises a piezoelectric structure and a layer of liquid reflective material, the layer of liquid reflective material is disposed between the piezoelectric structure and the first electrode, wherein a thickness of the layer of liquid reflective material is adjustable by deformation of the piezoelectric structure
Data Source
AI summary
The present disclosure provides a light-emitting structure, a display panel, a display device, and a control method for a display panel, so as to solve the problem that the user's eyes cannot clearly see the image displayed by the display panel due to ambient light. The light-emitting structure includes a light-emitting unit and a variable reflectivity unit. The light-emitting unit includes a first electrode, a second electrode and a light-emitting layer in between. The first electrode is a transparent electrode. The variable reflectivity unit includes a piezoelectric structure and a layer of liquid reflective material between the first electrode and the piezoelectric structure. A thickness of the layer of the liquid reflective material filled between the piezoelectric structure and the first electrode is changed by deformation of the piezoelectric structure. The light-emitting structure is used to emit light for displaying the image.