Anisotropic Scattering Member for Display Illuminance
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Solution Overview
Problem
Existing display devices, particularly reflective and transflective LCDs, suffer from image blur due to the scattering of light by anisotropic scattering films, which affects the viewing angle characteristics and contrast ratio, leading to reduced image clarity and visibility, especially in bright environments.
Innovation Solution
A display device configuration featuring a color filter with filters aligned in a manner that minimizes transmittance changes in the main viewing angle direction, combined with an anisotropic scattering member whose scattering axis direction coincides with the main viewing angle, reducing light scattering and image blur, and incorporating a reflective member and a liquid-crystal layer for improved display performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a scattering member is arranged on the output surface to increase light reflectance and improve viewing angle characteristics, then the illuminance and viewing angle performance are improved, but the reflected light spreads out causing image blur
Solution Approach 1:
The patent applies different properties to different regions of the display device. The scattering member is configured with specific local characteristics: the scattering central axis extends in the azimuth direction coincident with the maximum contrast ratio azimuth, creating directional scattering properties. This local quality approach allows the scattering member to enhance illuminance in the viewing direction while minimizing lateral light spread that causes blur.
Solution Approach 2:
The patent changes the orientation parameter of the scattering member's central axis to align with the azimuth direction of maximum contrast ratio. By adjusting this angular parameter, the scattering characteristics are optimized to improve viewing angle performance while controlling the degree of light spread. The inclination angle and azimuth orientation are specifically tuned to balance illuminance enhancement with image sharpness.
2Adaptability or versatility
If the scattering central axis extends in an azimuth coincident with maximum contrast ratio azimuth to improve viewing angle characteristics, then viewing angle dependence is improved, but light still spreads in the surface causing blur
Solution Approach 1:
The scattering member exhibits anisotropic scattering properties with different scattering characteristics in different directions. The scattering central axis is specifically oriented in the azimuth direction of maximum contrast ratio, creating directional quality that enhances viewing angle performance. The scattering intensity varies locally depending on the angle from the central axis, with reduced scattering in directions that would cause image blur.
Solution Approach 2:
The scattering member has asymmetric scattering characteristics relative to the display surface normal. The scattering central axis is inclined at a specific angle and oriented in a specific azimuth, creating an asymmetric scattering pattern that favors the viewing direction while suppressing lateral spread. This asymmetric configuration allows the same component to simultaneously improve viewing angle characteristics and maintain image sharpness.
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 image blur and directional dependence of light, enhancing the visibility and quality of the displayed image by minimizing transmittance changes in the main viewing angle direction, thus improving the display's performance in both bright and dark environments.
Implementation Method 1
Light passing through the anisotropic scattering film along the scattering central axis is converted into scattered light
Implementation Method 2
The color filter is formed such that a change in transmittance of the filters per pixel in the main viewing angle direction is smaller than a change in transmittance of the filters per pixel in a direction orthogonal to the main viewing angle direction
Implementation Method 3
a reflective member; a first substrate provided with the reflective member
Data Source
AI summary
A display device includes a display surface with pixels including four sub-pixels of four colors, and being arrayed in a matrix of a first viewing angle direction and a second viewing angle direction orthogonal thereto. The first viewing angle direction in a direction parallel to the display surface of a main viewing angle direction that intersects with the display surface. A reflective member, first substrate, a second substrate facing the first substrate, a color filter with filters of four colors corresponding to the four sub-pixels, and a scattering member is provided on the second substrate. For the color filter, a change in transmittance of the filters per pixel in the main viewing angle direction is smaller than a change in transmittance of the filters per pixel in a direction orthogonal to the first viewing angle direction in the second viewing angle direction parallel to the display surface.