Display Panel Lens Structure for Front-View Light Extraction
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Solution Overview
Problem
Conventional display panels experience low light extraction efficiency at front-view angles due to the inherent light pattern characteristics of LED chips, leading to increased power consumption to maintain brightness.
Innovation Solution
Incorporating a lens structure on the display panel that overlaps the light-emitting unit to converge light emitted by the LED chips, improving light extraction efficiency and reducing the need for high driving currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If LED chips with inherent Lambert distribution light pattern are used, then the light emission is uniform in all directions, but the light extraction efficiency at front-view angle is low
Solution Approach 1:
A lens structure is introduced as an intermediary component between the LED chip and the front-view direction. This lens structure modifies the light path and concentrates the Lambert-distributed light into a more directional beam toward the front-view angle, thereby improving both brightness and extraction efficiency without changing the LED chip itself.
Solution Approach 2:
The patent changes the optical parameters of the system by introducing a lens structure with specific refractive index and curvature. This transforms the light distribution pattern from Lambertian (cosine distribution) to a more concentrated angular distribution, improving light extraction efficiency at the front-view angle while maintaining overall brightness.
2Illumination intensity
If large driving current is applied to meet front-view brightness requirement, then the brightness requirement is satisfied, but power consumption increases
Solution Approach 1:
The lens structure acts as an optical intermediary that improves the efficiency of light emission in the front-view direction. By concentrating the light distribution, it reduces the total energy required from the LED chip to achieve the same front-view brightness, thereby lowering power consumption while maintaining brightness requirements.
3Loss of energy
If lens structure is added to improve light extraction efficiency, then light extraction efficiency and display effect are improved, but device complexity increases
Solution Approach 1:
The lens structure is designed to serve multiple functions: it concentrates light toward the front-view angle, protects the LED chip, and may incorporate color conversion or filtering properties. This multi-functionality justifies the added structural element by providing multiple benefits from a single component addition.
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
Enhances light extraction efficiency and display quality while reducing power consumption by directing light emission perpendicular to the driving substrate, thus minimizing the need for increased driving currents at front-view angles.
Implementation Method 1
a lens structure, disposed on one side of the light-emitting unit away from the driving substrate; where the lens structure at least partially overlaps the light-emitting unit in a direction perpendicular to a plane where the driving substrate is located
Data Source
AI summary
A display panel and a display device are provided. The display panel includes: a driving substrate; a light-emitting unit electrically connected to one side of the driving substrate; a lens structure disposed on a side of the light-emitting unit away from the driving substrate; in a direction perpendicular to a plane where the driving substrate is located, the lens structure at least partially overlaps the light-emitting unit. Through the embodiments of the application, the light extraction efficiency of the display panel is improved, the display effect of the display panel is improved, and the power consumption of the display panel is reduced.