Integrated Diffusing Unit and Collimating Light Guide Plate
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Solution Overview
Problem
Display apparatuses with liquid crystal panels face limitations in viewing angle, resolution, and outdoor visibility due to narrow viewing angles, gray scale inversion, and color shifts, particularly when using prism sheets and diffusing plates with air layers that reduce transmittance and increase reflectance.
Innovation Solution
A diffusing unit is integrated with a polarizing plate without an air layer, using a diffusing layer formed by beads mixed with a binder, and a light guide plate with prismatic structures to collimate light, enhancing viewing angle and reducing phase differences and reflectance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a diffusing plate with air layer is used to increase viewing angle, then viewing angle is improved, but transmittance is reduced due to reflection at the air layer interface
Solution Approach 1:
The patent merges the diffusing plate and polarizing plate into a single integrated component, eliminating the air layer interface between them. This integration removes the reflective boundary that caused light loss, allowing light to pass through without energy loss while maintaining the diffusing function for wide viewing angle.
Solution Approach 2:
The patent extracts and removes the air layer from the optical path between the diffusing plate and polarizing plate. By eliminating this intermediate air layer, the patent eliminates the reflective interface that caused transmittance reduction, while preserving the diffusing plate's ability to widen viewing angle.
2Shape
If a prism sheet is used to collimate light from the light guide plate, then light collimation is improved, but resolution is sacrificed
Solution Approach 1:
The patent integrates the collimation function directly into the light guide plate structure itself, eliminating the need for a separate prism sheet. This integration maintains light collimation while preserving resolution by avoiding the optical interference and light loss that occurred with separate prism sheets.
Solution Approach 2:
The light guide plate is designed to perform multiple functions simultaneously: it guides light, collimates light, and works with the integrated diffusing unit to provide wide viewing angle. This multi-functionality eliminates the need for separate optical components that were causing resolution loss.
3Object-affected harmful factors
If external light is reflected by the diffusing plate and air layer, then outdoor visibility is reduced, but the structure remains simple
Solution Approach 1:
By merging the diffusing plate and polarizing plate into a single integrated component, the patent eliminates the air layer interface that caused external light reflection. This reduces harmful reflections improving outdoor visibility while maintaining structural simplicity through integration.
Solution Approach 2:
The patent extracts and removes the air layer that was causing external light reflection. By eliminating this intermediate layer, external light no longer reflects off the interface, improving outdoor visibility without adding structural complexity.
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 transmittance, resolution, and outdoor visibility by eliminating air-layer reflections, reducing gray scale inversion, and maintaining high contrast ratios and color gamut under ambient light conditions.
Implementation Method 1
a diffusing layer integrally provided on a surface of the polarizing plate
Implementation Method 2
a light guide plate which collimates and provides light to a liquid crystal panel
Data Source
AI summary
A diffusing unit includes: a polarizing plate; and a diffusing layer integrally provided on a surface of the polarizing plate without an air layer therebetween. By using a display apparatus employing a collimating light guide plate and the diffusing unit, the optical performances such as resolution and viewing angle can be improved. Also, because gray scale inversion and color shifts can be reduced or eliminated using collimated light, image quality of the display apparatus can be improved.