Display Panel Optical Assembly for Ambient Light Rejection
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Solution Overview
Problem
OLED displays with top emission suffer from reduced light output efficiency due to strong ambient light reflection, which is currently mitigated by using a quarter-wave plate and polarizer, but this solution halves the light intensity.
Innovation Solution
A display panel with light absorbing and reflecting assemblies, comprising a support member, a reflecting member, and a first light-absorbing member, is used to reflect emitted light and absorb external ambient light, thereby increasing light output efficiency while minimizing ambient light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light emitting layer with a larger aperture ratio is adopted to ensure light output efficiency, then light output efficiency is improved, but ambient light reflection increases affecting display effect
Solution Approach 1:
The light absorbing and reflecting assembly is divided into multiple functional parts: a reflecting member (first part) that reflects emitted light back through the opening, and a light absorbing member (second part) that absorbs ambient light. This segmentation allows each part to perform its specific function optimally without interfering with the other, resolving the contradiction between maintaining high light output and reducing ambient light reflection.
Solution Approach 2:
The light absorbing and reflecting assembly is positioned specifically at the light emitting unit location, and the light absorbing member is configured to selectively absorb ambient light while the reflecting member selectively reflects emitted light. This local quality approach ensures that the assembly only affects light in its immediate vicinity, allowing high aperture ratios without increasing overall reflection.
2Object-affected harmful factors
If a quarter-wave plate and polarizer are attached to the panel to reduce ambient light reflection, then ambient light reflection is reduced, but light output efficiency decreases by half
Solution Approach 1:
The invention extracts only the necessary light control functions from the conventional quarter-wave plate and polarizer system. Instead of using a polarizer that absorbs half the light, the reflecting member redirects emitted light back through the opening, and the light absorbing member selectively absorbs ambient light. This extraction approach achieves ambient light rejection without the 50% light loss penalty.
Solution Approach 2:
The light absorbing member converts the harmful ambient light reflection into a beneficial effect by selectively absorbing ambient light while allowing emitted light to pass through. The reflecting member converts potentially lost emitted light into a beneficial effect by redirecting it back through the opening, thereby improving overall light output efficiency.
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 solution effectively enhances light output efficiency and reduces the adverse impact of ambient light on the display effect, outperforming traditional methods by maintaining light intensity while preventing ambient light reflection.
Implementation Method 1
the light absorbing and reflecting assembly is configured to reflect at least part of light emitted by the light emitting unit to radiate through the opening
Implementation Method 2
the light absorbing and reflecting assembly is further configured to absorb external ambient light
Data Source
AI summary
A display panel and a display device are provided in the disclosure. The display panel includes a carrier substrate, multiple emitting units disposed on the carrier substrate, and multiple light absorbing and reflecting assemblies. The multiple light absorbing and reflecting assemblies are disposed in correspondence with the multiple light emitting units and each of the multiple light absorbing and reflecting assemblies defines an opening, and where the light absorbing and reflecting assembly is configured to reflect at least part of light emitted by the light emitting unit to radiate through the opening, and to absorb external ambient light.