Light Guide Plate Indentation for LED Alignment
Solution Overview
Problem
Existing backlight modules face challenges in precisely aligning the light emitting center line of the LED lamp with the light incident center line of the light guide plate, leading to hot spots and uneven brightness due to misalignment.
Innovation Solution
A light guide plate with an indentation on its side portion, designed to accommodate the LED lamp, ensuring the light emitting center line of the LED lamp coincides with the light incident center line of the plate, either as a reverse taper or matching the shape of the LED lamp, facilitating precise alignment and reducing hot spots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the LED lamp strip and light guide plate are assembled separately, then the assembly process is simple, but the light emitting center line cannot precisely coincide with the light incident center line
Solution Approach 1:
The light guide plate is pre-formed with an indentation structure before assembly. This preliminary structural preparation ensures that when the LED lamp strip is installed, the light emitting center line automatically coincides with the light incident center line, eliminating alignment errors without complicating the assembly process.
Solution Approach 2:
The indentation structure acts as an intermediary element between the LED lamp strip and the light guide plate. It serves as a positioning feature that mediates the alignment between the two components, ensuring precise coincidence of center lines while maintaining simple separate assembly.
2Ease of manufacture
If the light emitting surface and light incident surface are not precisely aligned, then assembly is easier, but hot spots appear on the light emitting surface
Solution Approach 1:
The light guide plate is pre-formed with an indentation structure before assembly. This preliminary structural preparation ensures that when the LED lamp strip is installed, the light emitting center line automatically coincides with the light incident center line, eliminating alignment errors without complicating the assembly process.
Solution Approach 2:
The indentation structure acts as an intermediary element between the LED lamp strip and the light guide plate. It serves as a positioning feature that mediates the alignment between the two components, ensuring precise coincidence of center lines while maintaining simple separate assembly.
3Manufacturing precision
If an indentation structure is added to the light guide plate, then alignment precision is improved, but the device complexity increases
Solution Approach 1:
The light guide plate is segmented into functional regions: the indentation structure and the main body. This segmentation allows the positioning function to be isolated in a specific region without affecting the overall simplicity of the device. The indentation is a localized feature that provides alignment precision while keeping the rest of the structure simple.
Solution Approach 2:
The light guide plate is pre-formed with an indentation structure before assembly. This preliminary structural preparation ensures that when the LED lamp strip is installed, the light emitting center line automatically coincides with the light incident center line, eliminating alignment errors without complicating the assembly process.
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 ensures even light distribution, reduces optical loss, and enhances the brightness and stability of the liquid crystal panel by aligning the light emitting and incident center lines, thereby alleviating hot spots and improving the overall display performance.
Implementation Method 1
the light will emit from the light emitting surface 122 of the top portion of the light guide plate 12 after refracted or reflected in the light guide plate 12
Implementation Method 2
the light will emit from the light emitting surface 122 of the top portion of the light guide plate 12 after refracted or reflected in the light guide plate 12
Data Source
AI summary
A light guide plate, a backlight module and a display device employing the same. The light guide plate is configured to guide light emitted from an LED lamp on an LED lamp strip, and a light incident surface of a side portion of the light guide plate is provided with an indentation; when the LED lamp is locked in the indentation, a light emitting center line of the LED lamp coincides a light incident center line of the light guide plate. The backlight module includes a light guide plate, and the display device includes the above backlight module.