Double-Sided LCD Light Guide with Inclined Portion
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Solution Overview
Problem
Double-sided displaying type LCD devices face challenges with lower brightness due to inefficient light usage and interference fringes, as light from a single source and light guiding plate is split between two panels, leading to non-uniform illumination and light leakage.
Innovation Solution
Incorporating an inclined portion on the light guiding plate that thickens near the light source, with strategically positioned displaying panels and a frame structure that includes a light reflective portion to manage interference fringes and enhance light usage, allowing for adjustment of fringe positions and improved brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single light source and light guiding plate are used for double-sided display, then device complexity is reduced, but brightness is insufficient
Solution Approach 1:
The light guiding plate is segmented into multiple light guiding regions (first light guiding region and second light guiding region) with different optical characteristics. The first region has a first refractive index and the second region has a second refractive index, allowing differential light control for each display panel to improve brightness while maintaining a single integrated structure
Solution Approach 2:
Different portions of the light guiding plate are assigned different optical properties (refractive indices) to optimize light guidance for each specific display panel. This local differentiation ensures that each panel receives adequate light intensity while using a unified light guiding plate structure
2Illumination intensity
If light guiding plate has inclined portion to guide light, then light distribution is improved, but interference fringes are formed
Solution Approach 1:
The inclined portion in the light guiding plate, which initially causes light leakage and interference fringes, is strategically utilized to position interference fringes in non-display regions. By carefully designing the inclination angle and position, the harmful interference is redirected to areas that do not affect image quality, converting a defect into a controllable feature
Solution Approach 2:
The problem of interference fringes affecting display quality is resolved by shifting the interference pattern to a different spatial dimension - specifically, to regions outside the display area. The inclined portion creates interference fringes that extend into non-display regions, effectively separating the harmful optical effects from the useful display function
3Adaptability or versatility
If displaying panels are arranged on both sides of light guiding plate, then multifunctional display is achieved, but light is not uniformly guided
Solution Approach 1:
The light guiding plate is divided into distinct light guiding regions with different optical parameters. The first light guiding region is optimized for guiding light to the first display panel, while the second light guiding region is optimized for the second display panel, ensuring uniform light distribution to each panel despite the double-sided configuration
Solution Approach 2:
Each light guiding region possesses locally optimized optical properties (different refractive indices) tailored to the specific requirements of the adjacent display panel. This local optimization ensures that light is uniformly guided to each panel while maintaining the ability to display on both sides
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
This configuration minimizes the impact of interference fringes on displaying panels, achieving higher brightness and more uniform illumination across both panels by effectively directing light and positioning fringes away from the image areas.
Implementation Method 1
a light guiding plate (32) having an inclined portion (32b) which becomes thicker as it becomes nearer the light source (31)
Implementation Method 2
a frame (6) having a frame protrusion (6a) which covers the inclined portion (32b) of the light guiding plate (32)
Implementation Method 3
light is apt to leak from the inclined portion and thus interference fringes are easily formed
Data Source
AI summary
An electro-optical device includes a light source, a light guiding plate, a first displaying panel, and a second displaying panel, in which the light guiding plate has an inclined portion which becomes gradually thicker as it becomes nearer the light source, the second displaying panel is arranged on a first side of the light guiding plate, on which the inclined portion is disposed, and the first displaying panel is arranged on a second side of the light guiding plate, on which the inclined portion is not disposed, and an end portion of a displaying region of the second displaying panel is arranged nearer the light source than an end portion of a displaying region of the first displaying panel.