Segmented Side-Reflection Backlight Module for Thermal Shrinkage
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Solution Overview
Problem
Conventional backlight modules for vehicle-mounted display screens face challenges in maintaining brightness and display quality due to thermal shrinkage inconsistencies between reflect sheets and light-guide plates, leading to light loss and separation issues at high temperatures.
Innovation Solution
A backlight module design featuring a light-guide plate with a side-reflection unit comprising discontinuous first reflection parts and connecting parts, which reduces stress and shrinkage differences, ensuring stable connection and minimizing light loss by preventing separation between the side-reflection subunit and the light-guide plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional side-reflection unit with continuous reflect sheet is used, then light reflection is maintained, but thermal shrinkage inconsistency causes separation from the light-guide plate at high temperatures
Solution Approach 1:
The side-reflection unit is divided into multiple discrete first reflection parts (first reflective strips) spaced apart from each other, rather than using a continuous reflect sheet. This segmentation allows each strip to independently accommodate thermal shrinkage without causing separation from the light-guide plate, while still maintaining effective light reflection across the entire side surface.
2Reliability
If the side-reflection unit is made discontinuous to reduce stress, then separation is prevented, but light reflection consistency may be compromised
Solution Approach 1:
Each first reflection part is designed with specific dimensions and spacing to optimize local light reflection while accommodating thermal effects. The reflection parts are positioned and sized to ensure that their collective reflective effect maintains uniformity across the entire side surface, compensating for the discontinuous structure.
3Illumination intensity
If brightness requirements are increased for vehicle-mounted displays, then display quality improves, but thermal shrinkage effects become more severe
Solution Approach 1:
The segmented structure of multiple discrete reflection parts allows the system to handle higher temperatures generated by increased brightness requirements. Each segment independently manages thermal stress, preventing the cumulative shrinkage effects that would compromise connection stability in high-brightness vehicle-mounted display applications.
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 design enhances display quality by maintaining light reflection consistency and reducing the risk of separation between the side-reflection subunit and the light-guide plate, even at high temperatures, thus ensuring the required brightness for vehicle-mounted display screens.
Implementation Method 1
a first side-reflection subunit and a plurality of connecting parts, wherein the first side-reflection subunit includes at least a plurality of first reflection parts
Data Source
AI summary
The application provides a backlight module, a display screen, a rearview mirror and a vehicle, and relates to the field of display technology, and the backlight module may greatly reduce a risk of separation between a reflection unit and a light-guide plate. The backlight module includes: a light-guide plate, including: a light-outlet surface and a backlight surface set opposite to each other, and a side surface, wherein the side includes a first sub-side surface and a second sub-side surface connected to each other: a light-emitting unit, arranged at the first sub-side surface of the light-guide plate; and a reflection unit, including: a main reflection unit and a side-reflection unit, wherein the side-reflection unit is arranged at the second sub-side surface of the light-guide plate, the side-reflection unit includes at least a first side-reflection subunit and a plurality of connecting parts, the first side-reflection subunit includes at least a plurality of first reflection parts, each of the first reflection parts is connected with at least one of the connecting parts, a first gap presents between the main reflection unit and a part of the first reflection part where the first reflection part is not connected with the connecting part, and a second gap presents between two adjacent first reflection parts.