Backlight Module Lens Grid for Uniform Luminance
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Solution Overview
Problem
Direct-type backlight modules in LCD devices face challenges with uneven luminance due to the discrete placement of LEDs, leading to increased manufacturing costs as more LEDs are required to achieve uniformity.
Innovation Solution
The implementation of a backlight module design where LEDs are arranged in a grid pattern on a substrate, each accompanied by a lens that directs light to create uniform luminance across rectangular areas, reducing the need for additional LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If more LEDs are added to improve luminance uniformity, then luminance uniformity is improved, but manufacturing cost increases
Solution Approach 1:
A diffuser plate is introduced as an intermediary component between the LED array and the display panel. The diffuser plate scatters and redistributes the light from discrete LEDs across the display area, achieving uniform luminance without requiring additional LEDs. This mediator component resolves the contradiction by providing a cost-effective solution that improves illumination uniformity.
Solution Approach 2:
The patent changes the optical parameters of the system by introducing a diffuser plate with specific optical properties (scattering coefficient, thickness, material composition). This parameter change allows the light distribution pattern to be modified, transforming the discrete LED illumination into a uniform luminance distribution across the display area.
2Illumination intensity
If more LEDs are added to improve luminance uniformity, then luminance uniformity is improved, but device complexity increases
Solution Approach 1:
The diffuser plate serves as a mediator that simplifies the overall device structure by replacing the need for numerous LEDs with a single scattering component. This reduces device complexity while maintaining the desired luminance uniformity.
Solution Approach 2:
The diffuser plate performs multiple functions simultaneously: it scatters light to achieve uniform luminance, protects the LED array, and can serve as a structural support element. This multi-functionality reduces the need for additional components, thereby simplifying device complexity.
3Illumination intensity
If a diffuser is used to achieve uniform luminance, then luminance uniformity is improved, but light loss increases
Solution Approach 1:
The patent optimizes the diffuser plate parameters (material selection, thickness, scattering coefficient) to minimize light absorption and reflection losses while maximizing light scattering efficiency. By carefully controlling these parameters, the diffuser plate achieves uniform luminance distribution with minimal energy loss.
Solution Approach 2:
The diffuser plate is designed as a cost-effective, single-use component that can be easily replaced if needed. This approach accepts some light loss as a trade-off for achieving uniform luminance through a simple, economical solution rather than attempting to recover or reuse the diffuser.
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 solution achieves improved luminance uniformity without increasing the number of LEDs, thereby reducing manufacturing costs and potentially eliminating the need for a diffuser in the display device.
Implementation Method 1
each LED light source comprises an LED and a corresponding lens disposed above the LED, the corresponding lens directing light rays emitted from the LED onto
Data Source
AI summary
A display device includes a display panel, a first light source, and second light source. The first and second light sources are respectively aligned with a first spot and second spot in a direction perpendicular to a substrate. The first light source irradiates the first spot and a third spot with luminance of a first value, respectively. The first light source irradiates a midpoint between the first and second spots with a luminance value that is half of the first value.