Reflective Panel Light Guide with Dual-Surface Brightness Control
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Solution Overview
Problem
Existing reflective displays suffer from white fog phenomena and reduced display frame definition due to uneven light distribution, affecting display quality.
Innovation Solution
The electronic device incorporates a reflective panel with a light guide plate having distinct surfaces for light emission, where the first surface achieves a higher maximum brightness than the second surface, mitigating white fog and enhancing frame clarity by optimizing light distribution through the use of dots on the light guide plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light guide plate with side light source is used in reflective display, then the display can be used in dark room or weak light environment, but white fog phenomenon occurs and display frame definition is reduced
Solution Approach 1:
The patent applies local quality by creating different surface characteristics on the light guide plate. The first surface (facing reflective panel) and second surface (facing user) are designed with different optical properties through dot structures with varying densities, sizes, or refractive indices. This allows each surface to optimize light extraction for its specific function: the first surface directs light toward the reflective panel while the second surface controls light emission to users, reducing white fog while maintaining brightness.
Solution Approach 2:
The light guide plate is segmented into distinct functional surfaces with different optical characteristics. By dividing the light guide plate into a first surface region and a second surface region with different dot patterns or optical structures, the patent enables independent optimization of light distribution for each surface, thereby achieving both high brightness and reduced white fog phenomenon.
2Illumination intensity
If light is emitted uniformly from light guide plate, then sufficient illumination is provided, but display frame definition and quality are affected
Solution Approach 1:
The patent implements local quality by varying the optical properties at different locations and surfaces of the light guide plate. The first surface has optimized light extraction characteristics for directing light to the reflective panel, while the second surface has different characteristics for user viewing. This localized optimization ensures that each region contributes appropriately to the overall display quality without causing frame definition issues.
Solution Approach 2:
The patent changes optical parameters such as dot density, dot size, dot shape, or refractive index across different surfaces of the light guide plate. By adjusting these parameters locally, the patent achieves non-uniform light distribution that prioritizes frame definition in certain regions while maintaining sufficient overall brightness, thereby resolving the contradiction between uniform illumination and display quality.
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 reduces white fog and improves display frame clarity by ensuring higher brightness on the primary light-emitting surface, while minimizing brightness on the secondary surface to enhance overall display quality.
Implementation Method 1
a light guide plate arranged on the reflective panel... when light emitted from the light source passes through the light guide plate
Implementation Method 2
light emitted from the light source passes through the light guide plate, a first light shape diagram is obtained by performing measurement on the first surface
Data Source
AI summary
An electronic device includes a reflective panel, a light guide plate and a light source. The light guide plate is disposed on the reflective panel, and the light guide plate has a first surface adjacent to the reflective panel, a second surface and a side surface connected between the first surface and the second surface. The light source is adjacent to the side surface of the light guide plate. When light emitted from the light source passes through the light guide plate, a first light shape diagram is obtained by performing measurement on the first surface, a second light shape diagram is obtained by performing measurement on the second surface, the first light shape diagram has a first maximum brightness, the second light shape diagram has a second maximum brightness, and the first maximum brightness is greater than the second maximum brightness.