Stacked Light-Guiding Plates for Thin Backlight Partial Driving
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Solution Overview
Problem
Existing display apparatuses using edge light method backlights face challenges in reducing thickness while maintaining effective partial driving and image quality.
Innovation Solution
The use of a backlight unit with multiple light-guiding plates and a bent light source substrate configuration allows for finer segmentation of light emission areas and efficient heat dissipation, reducing thickness and enhancing image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If direct backlight is used for partial driving, then effective segmentation of light emission region is achieved, but thickness increases
Solution Approach 1:
The backlight is divided into multiple independent light emission regions by using multiple light-guiding plates, each capable of independent control. This allows partial driving functionality while maintaining a thin profile, as each plate can be selectively activated without requiring a thick direct backlight structure.
Solution Approach 2:
The patent transitions from a planar direct backlight approach to a stacked multi-layer configuration with light-guiding plates arranged in the thickness direction. This dimensional change enables partial driving control while reducing the overall backlight thickness by utilizing the vertical space for light guidance rather than requiring horizontal expansion.
2Adaptability or versatility
If multiple light-guiding plates are used for partial driving, then effective light emission segmentation is achieved, but device complexity increases
Solution Approach 1:
Each light-guiding plate serves multiple functions: it guides light, enables partial driving control, and can be independently adjusted for different emission regions. This multi-functionality reduces the need for additional separate components, thereby managing complexity while achieving effective partial driving.
Solution Approach 2:
Multiple light-guiding plates are stacked in a nested configuration where each plate is positioned between light sources and the display panel. This nested arrangement allows multiple functional layers to be integrated within a compact vertical space, reducing overall device complexity by eliminating the need for separate control mechanisms for each region.
3Length of stationary object
If light sources are positioned close to light-guiding plates, then thickness is reduced, but heat dissipation becomes difficult
Solution Approach 1:
Heat dissipation structures such as heat sinks or thermal conductive materials are introduced as intermediary elements between the light sources and the light-guiding plates. These intermediaries conduct heat away from the closely positioned light sources without increasing the overall backlight thickness, thus maintaining both thin profile and effective heat dissipation.
Solution Approach 2:
The patent replaces purely mechanical heat dissipation solutions (which would increase thickness) with thermally conductive material layers or integrated heat dissipation structures that utilize thermal conduction principles. This allows efficient heat management in a thin configuration by substituting mechanical spacing requirements with material-based thermal management.
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 enables a thinner display apparatus with improved image contrast and quality through precise light emission control and efficient heat management.
Implementation Method 1
a light-guiding plate which guides light in a light-guiding manner
Implementation Method 2
a wavelength conversion member that converts a wavelength of light from the light-emitting element to a displayable wavelength
Data Source
Figure 1~2
Figure 3A~3B
Figure 4A~4B
AI summary
An illuminating unit includes: a light-guiding section including a plurality of light-guiding plates, in which the light-guiding plates are stacked in a thickness direction and each have a light entrance section and a light output surface; a plurality of light sources that output light toward the light entrance sections of the respective light-guiding plates of the light-guiding section; and a substrate that supports the plurality of light sources and on which a circuit section is disposed, in which the circuit section drives each of the light sources. A first portion, on which the circuit section is disposed, of the substrate is disposed in opposition to a back surface of the light-guiding section.