Backlight Module Sidewall Recess for LED Mura Reduction
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Solution Overview
Problem
Conventional backlight modules for liquid crystal displays face issues with insufficient mixed light distance between the light incident side of the light guide plate and the display region, leading to LED mura and compromised display performance.
Innovation Solution
A backlight module design featuring a recess in the sidewall of the chassis to house the printed circuit board, allowing the light source and light guide plate to be closer to the sidewall, thereby increasing the mixed light distance and preventing LED mura.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the printed circuit board is disposed in a conventional position, then the structure is simple, but the mixed light distance is insufficient causing LED mura
Solution Approach 1:
The printed circuit board is relocated from the bottom plate to the sidewall of the chassis, utilizing the vertical dimension and side space. This dimensional change allows the light source to be positioned closer to the light guide plate's incident side, extending the mixed light distance and preventing LED mura without increasing the display area or overall device size.
Solution Approach 2:
The printed circuit board is nested within the sidewall structure of the chassis through the recess design. This nesting approach integrates the PCB into the existing chassis geometry, allowing the light source to be positioned optimally for light mixing while maintaining a compact overall structure and not increasing the external dimensions of the device.
2Reliability
If the mixed light distance is extended by moving components, then LED mura is prevented, but the device volume increases
Solution Approach 1:
Instead of extending the mixed light distance by increasing the horizontal distance between components, the solution utilizes the vertical dimension by positioning the printed circuit board on the sidewall. This allows the light source to be closer to the light guide plate incident side, achieving sufficient light mixing within the existing device volume without enlargement.
Solution Approach 2:
The recess in the sidewall creates a localized structure that optimally positions the printed circuit board and light source. This local structural modification enables the light source to be positioned at the optimal distance from the light guide plate for effective light mixing, achieving display uniformity without increasing the overall device volume.
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 design effectively lengthens the mixed light distance, enhancing display performance by preventing LED mura and maintaining product competitiveness without enlarging the display or reducing its area.
Implementation Method 1
a light incident side of a light guide plate is opposite to a light emitting side of the light source
Data Source
AI summary
A backlight module includes a chassis, a printed circuit board, a light source, and a light guide plate. The chassis includes a bottom plate and a sidewall. The sidewall is disposed on at least one side of the bottom plate. The sidewall has a recess therein. At least one part of the printed circuit board is located in the recess. The light source is electrically connected to the printed circuit board. The light incident side of the light guide plate is opposite to the light emitting side of the light source.