Backlight Module Shutter Control for Wide Color Gamut
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Solution Overview
Problem
Existing liquid crystal display devices have a low color gamut, which limits their competitive advantage compared to OLED and LED displays.
Innovation Solution
A backlight module is designed with a light guide plate, a backlight plate featuring transparent holes and shutter units, and a light strip with red, green, and blue light sources, where the shutter units, made of liquid crystals, control the passage of light through the transparent holes to enhance color representation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a traditional LED white backlight with open cell is used, then the device structure is simple and manufacturing is easy, but the color gamut is limited to about NTSC 85%
Solution Approach 1:
The backlight is segmented into multiple independent light sources with different wavelengths (red, green, blue LEDs or lasers) instead of using a single white LED. Each wavelength component is independently controlled and directed through specific transparent holes in the backlight plate, allowing precise color gamut optimization while maintaining manufacturing feasibility through modular assembly
Solution Approach 2:
Different regions of the backlight plate are assigned different functions: white light emitting regions for general illumination and colored light emitting regions (red, green, blue) for expanding color gamut. The shutter layers are selectively positioned over specific wavelength regions to control which colors reach the display panel at different times, enabling NTSC 100% color gamut while keeping the overall structure manufacturable
2Illumination intensity
If multiple shutter layers and transparent hole units are added to control RGB light emission, then the color gamut is improved to NTSC 100%, but the device structure becomes more complex
Solution Approach 1:
The shutter layers are designed as dynamic components that can switch between open and closed states to control light passage. By dynamically adjusting which shutter layers are open at different times, the system can display different colors (red, green, blue, or combinations) through the same physical structure, achieving NTSC 100% color gamut without requiring separate static structures for each color channel
Solution Approach 2:
Multiple wavelength control functions are merged into a single backlight module structure. The white light source and colored light sources share the same light guide plate and display panel interface, with shutter layers integrated into the backlight plate structure. This consolidation achieves high color gamut while avoiding the need for completely separate red, green, and blue backlight modules
3Illumination intensity
If a straight down backlight with multiple light sources is used, then full color coverage is achieved, but the number of light sources increases and costs increase
Solution Approach 1:
Instead of arranging multiple light sources in a single dimension (straight down from the back), the invention uses a light guide plate to distribute light across a two-dimensional surface. The shutter layers selectively block or transmit light at different positions and angles, enabling full color gamut coverage with fewer physical light sources by utilizing spatial and angular light distribution
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 improves the color gamut of liquid crystal display devices by accurately controlling RGB light-emitting points, surpassing the limitations of fluorescent pink conversion and enhancing color representation.
Implementation Method 1
a light guide plate having a light-emitting surface
Implementation Method 2
light guide plate...light sources arranged at intervals
Implementation Method 3
the shutter units, made of liquid crystals, control the passage of light through the transparent holes
Implementation Method 4
shutter layer arranged on the backlight plate, the shutter layer provided with a plurality of shutter units
Implementation Method 5
the light sources adopt light-emitting diodes
Implementation Method 6
a red light source emitting red light, a green light source emitting green light, and a blue light source emitting blue light
Implementation Method 7
the backlight plate provided with a plurality of transparent hole units arranged in an array
Data Source
AI summary
The present application discloses a backlight module and a display device. The backlight module includes a light guide plate, and the light-emitting surface includes a plurality of light-emitting units arranged in rows. A backlight plate is arranged on the light guide plate, and a plurality of transparent hole units are arranged on the backlight plate. A shutter layer is arranged on the backlight plate, and a number of shutter units are arranged on the shutter layer. The shutter units are arranged corresponding to the transparent hole units. The shutter units are used to control whether light passing through the transparent hole units passes through the shutter layer.