Backlight Module Light-Shielding Region Prevents Leakage
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Solution Overview
Problem
Traditional touchpad devices suffer from poor luminous efficiency and light leakage issues due to inadequate glue application methods, leading to a dull appearance and poor user experience.
Innovation Solution
A backlight module comprising a glass substrate, a light-outputting sheet with light-outputting and light-shielding regions, a light guide plate with a light mixing region, and reflective sheets, where the light-shielding regions are strategically positioned to prevent light leakage and enhance light uniformity by guiding light emitted by a light-emitting element through the light guide plate and glass substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If glue is applied all over the non-light-emitting area to avoid accidental touch, then touch safety is improved, but luminous efficiency deteriorates due to wasted light in the non-light-emitting area
Solution Approach 1:
The light-outputting sheet is divided into different regions with different optical properties: a light-outputting region that allows light transmission and a light-shielding region that blocks light. This local differentiation enables the non-light-emitting area to prevent accidental touch while the light-emitting area maintains high luminous efficiency without waste light
2Loss of energy
If glue is applied around the light-emitting area in a quadrilateral shape to improve luminous efficiency, then luminous efficiency is improved, but accidental touch problem worsens
Solution Approach 1:
The light-outputting sheet creates a light-shielding region that extends to the edges of the light guide plate, providing comprehensive touch protection while maintaining optimal luminous efficiency. This resolves the contradiction by achieving both goals simultaneously rather than trading one for the other
3Ease of operation
If the entire surface needs to emit light, then user experience is improved, but light leakage problem worsens resulting in a bright border around the backlight module
Solution Approach 1:
The light-outputting sheet strategically positions light-shielding regions at the periphery and light-outputting regions in the central area, enabling uniform light emission across the display surface while preventing light leakage from the sides. This eliminates the bright border effect while maintaining excellent user experience
Solution Approach 2:
The light-shielding region, which blocks light that would otherwise cause leakage, is positioned to define the light-outputting region. By converting the potential harmful effect of light leakage into a beneficial uniform light distribution pattern, the light-shielding region enhances both appearance quality and user experience
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
Effectively prevents light leakage and improves light uniformity by directing light away from the side surfaces of the light guide plate, resulting in a more efficient and visually appealing backlight module for touchpad devices.
Implementation Method 1
The light guide plate is disposed under the light-outputting sheet and has a light guide region and a light mixing region. The light guide region is disposed corresponding to the light-outputting region. The light mixing region is configured to receive light emitted by a light-emitting element and guide the light to the light guide region. The guided light leaves the light guide region and then sequentially propagates through the light-outputting region and the glass substrate.
Implementation Method 2
The reflective sheet is disposed under the light guide plate.
Implementation Method 3
The light-outputting sheet is disposed under the glass substrate and has a light-outputting region and a light-shielding region. The light-shielding region is disposed corresponding to at least a part of an outer periphery of the glass substrate.
Data Source
AI summary
A backlight module includes a glass substrate, a light-outputting sheet, a light guide plate, and a reflective sheet. The light-outputting sheet is disposed under the glass substrate and has a light-outputting region and a light-shielding region. The light-outputting region is disposed corresponding to the glass substrate. The light-shielding region is disposed corresponding to an outer periphery of the glass substrate. The light guide plate is disposed under the light-outputting sheet and has a light guide region and a light mixing region. The light guide region is disposed corresponding to the light-outputting region. The light mixing region is configured to receive light of a light-emitting element and guide the light to the light guide region. The light leaves the light guide region and then sequentially propagates through the light-outputting region and the glass substrate. The reflective sheet is disposed under the light guide plate.