Light Guide Plate with Dual Refractive Indices for LCD Brightness
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Solution Overview
Problem
Conventional liquid crystal display (LCD) apparatuses require additional optical members like brightness enhancing films and prism sheets to improve brightness uniformity, leading to increased volume and manufacturing costs due to the complexity of the assembly.
Innovation Solution
A light guide plate with a first optical member having different refractive indices for different light portions and a second optical member with a uniform refractive index for both light portions, which separates and converts the light to enhance brightness and uniformity without the need for additional optical sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If additional optical sheets (brightness enhancing film, prism sheet) are disposed on the light guide plate to improve brightness uniformity, then brightness uniformity is improved, but the volume of the LCD apparatus increases
Solution Approach 1:
The patent combines multiple optical functions (light path separation, refraction control, brightness enhancement) into a single integrated light guide plate structure with internal optical members, eliminating the need for separate optical sheets and thereby reducing the overall volume of the LCD apparatus while maintaining brightness uniformity
Solution Approach 2:
The light guide plate is designed to perform multiple functions simultaneously: it guides light, separates light paths using a first light path-changing portion, controls refraction using a second light path-changing portion, and enhances brightness uniformity, replacing what would traditionally require multiple separate optical components
2Illumination intensity
If additional optical sheets (brightness enhancing film, prism sheet) are disposed on the light guide plate to improve brightness uniformity, then brightness uniformity is improved, but the assembly time for the LCD apparatus is lengthened
Solution Approach 1:
By integrating multiple optical functions into a single light guide plate component, the number of parts that need to be assembled is reduced, thereby decreasing the assembly time for the LCD apparatus while still achieving the desired brightness uniformity through internal optical structures
3Illumination intensity
If additional optical sheets (brightness enhancing film, prism sheet) are disposed on the light guide plate to improve brightness uniformity, then brightness uniformity is improved, but the manufacturing cost of the LCD apparatus increases
Solution Approach 1:
The patent integrates multiple optical functions into a single light guide plate component, reducing the total number of parts and assembly steps, which simplifies the manufacturing process and reduces manufacturing costs while maintaining the ability to control brightness uniformity through internal optical structures
Solution Approach 2:
The light guide plate performs multiple optical functions (light guiding, path separation, refraction control, brightness enhancement) in one component, reducing the need for multiple specialized optical sheets and thereby simplifying the overall manufacturing process and reducing costs
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 brightness and brightness uniformity of the displayed image while reducing the number of components and manufacturing complexity, resulting in a more compact and cost-effective LCD apparatus.
Implementation Method 1
The first optical member has a first refractive index against a first light portion of a light and a second refractive index against a second light portion of the light
Implementation Method 2
The light converting member converts the second light portion of the light from the light guide plate into the first light portion
Data Source
AI summary
A light guide plate includes a first optical member having a first light path-changing portion to separate a first light portion and a second light portion from a light, and a second optical member having a second light path-changing portion corresponding to the first light path-changing portion. The first optical member has a first refractive index against the first light portion of the light and a second refractive index against the second light portion of the light, and the second optical member has the first refractive index against the first and second light portions. Thus, brightness and brightness uniformity of an image displayed on a display apparatus may be improved, and a number of parts of the display apparatus may be reduced.