Reflective Display Lighting with Gradient Scattering Layer
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Solution Overview
Problem
Displays with reflective image sections face reduced visibility and non-uniform luminance under low illuminance conditions due to angle-dependent light scattering characteristics, especially when illuminated by lighting devices without light guide plates, leading to reduced image contrast and visibility issues.
Innovation Solution
A lighting device that irradiates light diagonally onto a reflective image display section with angle-dependent light scattering characteristics, adjusting the intensity distribution to ensure uniform luminance when viewing an image of equal gray levels from a given position, using a combination of light sources and light adjustment sections like LEDs and neutral density filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a lighting device without a light guide plate is used to illuminate a reflective image display section, then visibility under low illuminance conditions is improved, but non-uniform luminance occurs due to angle-dependent light scattering characteristics
Solution Approach 1:
The patent applies local quality by making different regions of the light scattering layer have different scattering characteristics. Specifically, the light scattering layer has a gradient structure where the scattering power varies across different regions, with stronger scattering near the edges and weaker scattering toward the center, compensating for the non-uniform light distribution from the book light to achieve uniform luminance across the display region
Solution Approach 2:
The patent changes the physical parameter of the light scattering layer by controlling the concentration and distribution of scattering particles (such as TiO2 particles) within the resin layer. By adjusting the particle concentration gradient across the layer thickness and width, the scattering characteristics are modified to compensate for angle-dependent effects and achieve uniform luminance
2Object-affected harmful factors
If a light guide plate is used to cover the front side of the image display section, then light leakage toward the viewer is reduced, but the light guide plate affects image visibility and contrast
Solution Approach 1:
The patent extracts and eliminates the light guide plate from the display structure, replacing it with a book light configuration that illuminates the reflective display section from the side. This removal eliminates the light guide plate's negative effects on image contrast and visibility while the book light combined with the gradient light scattering layer provides the necessary illumination without compromising image quality
3Illumination intensity
If light is irradiated from a lighting device to an image display section with angle-dependent light scattering characteristics, then visibility is improved, but non-uniform intensity of scattered light results in non-uniform luminance
Solution Approach 1:
The patent applies local quality by creating a non-uniform light scattering layer with spatially varying scattering properties. The scattering particle concentration is higher near the edges and lower toward the center, creating local differences in scattering strength that compensate for the non-uniform light distribution from the book light, thereby achieving uniform luminance across the display region
Solution Approach 2:
The patent applies preliminary anti-action by pre-compensating for the expected non-uniform luminance in the reverse direction. The gradient structure of the light scattering layer is designed in advance to counteract the non-uniform light distribution from the book light, so that when light passes through the layer, the scattering effects automatically correct the luminance uniformity before the image is displayed
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 achieves improved uniformity in image luminance across different viewing angles, enhancing visibility and contrast by compensating for the angle-dependent light scattering characteristics, resulting in a more consistent and effective display experience.
Implementation Method 1
a light scattering layer having a gradient in which a scattering power varies across regions in a light receiving surface viewed from a light source side
Data Source
AI summary
Disclosed herein is a display including: a reflective image display section having pixels arranged in the display region; and a lighting device adapted to irradiate light to the image display section from diagonally in front, in which the light scattering characteristics in the display region are angle-dependent, and in which the lighting device irradiates light whose intensity distribution is adjusted so that when the display region displaying an image having an equal gray level is viewed from a given viewing position, the image luminance is uniform.