Display Backplane Light-Guiding Structure for Mini LED Uniformity
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Solution Overview
Problem
Mini LED backlights exhibit uneven brightness due to divergent light emission from LED lamps, resulting in darker areas between adjacent lamps, which affects the uniformity of the display.
Innovation Solution
A display backplane design featuring a light-emitting area with multiple sub-areas, each containing at least two light-emitting elements, a retaining wall structure, and a first light-guiding portion with a reflecting surface, which directs light towards a forward direction to enhance output intensity and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If mini LED lamps are used for backlight, then color vividness and brightness are improved, but light emission becomes divergent causing uneven brightness between adjacent lamps
Solution Approach 1:
A light guiding portion is introduced as an intermediary component between adjacent light-emitting elements. This light guiding portion redirects the divergent light from each LED lamp into the adjacent sub-area, mediating the light distribution to achieve uniform brightness across the entire backlight panel.
Solution Approach 2:
The light guiding portion is strategically positioned in specific locations between adjacent light-emitting elements to locally redirect light. This creates different light distribution characteristics in different regions, with each light guiding portion addressing the specific need of its adjacent sub-areas to achieve overall uniformity.
2Illumination intensity
If multiple LED lamps are arranged in the backlight, then light output intensity is improved, but darker areas appear between adjacent lamps
Solution Approach 1:
The light guiding portion acts as a mediator that captures light energy from each LED lamp and redirects it to adjacent sub-areas. This improves light distribution efficiency by ensuring that light energy is utilized more evenly across the entire backlight panel, reducing waste in the form of dark areas.
Solution Approach 2:
The divergent light emission pattern, which initially causes dark areas between lamps, is converted into a benefit by using the light guiding portion to redirect this divergent light into the adjacent sub-areas, transforming the harmful effect into useful illumination.
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 improves light output intensity and brightness uniformity between light-emitting elements, reducing the halo effect and enhancing the overall display performance by directing light emissions effectively.
Implementation Method 1
a first light-reflecting surface is provided on a side of the retaining wall structure close to the light-emitting elements
Implementation Method 2
a second light-reflecting surface is provided on a side of the first light-guiding portion close to the light-emitting elements
Data Source
AI summary
The present application discloses a display backplane and a display device. The display backplane includes a plurality of light-emitting sub-areas; each of the light-emitting sub-areas is provided with at least two light-emitting portions; a first light-guiding portion is arranged in each of the light-emitting sub-areas and is located between the at least two light-emitting portions, and a side of the first light-guiding portion close to the light-emitting elements has a second light-reflecting surface, and an orthographic projection of a portion of a side of the first light-guiding portion away from the substrate on the substrate falls within an orthographic projection of a portion of a side of the first light-guiding portion close to the substrate on the substrate.