Backlight Module Light Guide Plate Uniformity
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Solution Overview
Problem
Conventional backlight modules in keyboards face issues of uneven brightness and color unevenness due to the placement of light sources and mixing of different colored lights, leading to suboptimal visual effects.
Innovation Solution
A backlight module design featuring a light guide plate with a single-key light guide area, a light-blocking structure, and a light-shielding sheet, which includes microstructure portions to adjust light distribution and incorporate a light-absorbing layer to address brightness and color uniformity, while also serving as a heat dissipation channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple light sources are placed under each keyswitch to achieve individual light emission control, then individual keyswitch light control is improved, but light distribution uniformity deteriorates
Solution Approach 1:
A light guide plate is introduced as an intermediary component between the light sources and the keyswitches. The light guide plate receives light from multiple light sources and redistributes it through its structure (including microstructure portions and light guide structures) to achieve uniform light emission across each keyswitch area, thereby maintaining individual keyswitch control while solving the uniformity problem.
2Adaptability or versatility
If mixed light sources with multiple chip packages are used to emit white light, then color variety is improved, but color uniformity deteriorates
Solution Approach 1:
The light guide plate acts as a mediator that receives light from multiple chip packages emitting different colors and redistributes the mixed light uniformly across the keyswitch area. This intermediary structure ensures that the combined light from multiple chips achieves both color variety and color uniformity.
Solution Approach 2:
The light guide plate incorporates microstructure portions and light guide structures with different area ratios in different regions. These local structural variations are designed to compensate for the non-uniform light emission characteristics of individual chips, thereby achieving overall color uniformity across the keyswitch while maintaining the color variety provided by multiple chip packages.
3Use of energy by moving object
If light sources are placed close to keyswitches for efficient light emission, then light emission efficiency is improved, but heat dissipation deteriorates
Solution Approach 1:
The light guide plate serves as a thermal intermediary between the light sources and the keyswitches. It provides a thermal conduction path that allows heat from the light sources to be dissipated through the plate structure, preventing heat accumulation at the keyswitch locations while maintaining efficient light emission.
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 solution effectively addresses uneven brightness and color issues by optimizing light distribution and absorption, enhancing the uniformity of light emission across keyswitches and improving color consistency, while also providing heat dissipation to prevent performance degradation.
Implementation Method 1
The backlight module mainly uses a light guide plate to propagate the light emitted by light sources, so that all areas of the keyboard can emit light
Implementation Method 2
The light-reflecting plate is disposed above the circuit board
Implementation Method 3
the light-absorbing layer is disposed at a side of the light-shielding sheet facing the light guide plate
Data Source
AI summary
A backlight module includes a circuit board, a light-emitting unit, a light-reflecting plate, a light guide plate, and a light-shielding sheet. The light-emitting unit is disposed on the circuit board. The light-reflecting plate is disposed above the circuit board. The light guide plate is disposed above the light-reflecting plate and includes a single-key light guide area. The single-key light guide area includes an accommodating hole and a light-blocking structure. The accommodating hole runs through the single-key light guide area and accommodates the light-emitting unit. The light-blocking structure and the light-emitting unit are arranged in a direction. The light-shielding sheet is disposed above the light guide plate.