LCD Backlight Module with Multi-Peak Spectrum for High Color Saturation
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Solution Overview
Problem
Conventional liquid crystal displays (LCDs) in portable devices face challenges in achieving high color saturation due to the limitations of existing backlight modules and control circuitry, which result in poor color rendering and low luminance as NTSC ratio increases.
Innovation Solution
A liquid crystal display design featuring a backlight module with a white point source emitting a spectrum of light with at least three peaks, combined with a color filter substrate that includes blue, green, and red filters, optimized by specific formulas to enhance luminance and transmittance, thereby improving color saturation and NTSC ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If white LED with YAG phosphor is used as backlighting, then the backlight module is compact and simple in construct, but the color rendering property is poor and NTSC ratio is limited
Solution Approach 1:
The backlight module is segmented into multiple independent LED chips (blue, green, red) instead of using a single YAG phosphor conversion system. Each LED chip can be independently controlled and optimized, allowing precise control over the spectral output to achieve high color rendering while maintaining manufacturing simplicity through modular assembly
Solution Approach 2:
The backlight module uses a composite structure combining multiple types of LED chips (blue, green, red) with different emission characteristics. This composite approach allows the system to leverage the advantages of each LED type to achieve superior color rendering that cannot be obtained with a single LED or phosphor conversion system
2Manufacturing precision
If NTSC ratio is increased to improve color saturation, then color rendering is enhanced, but luminance decreases drastically
Solution Approach 1:
The backlight module employs dynamic control of multiple LED chips with different colors and wavelengths. By adjusting the intensity and spectral distribution of each LED chip independently, the system can optimize the balance between color saturation and luminance output, preventing the drastic luminance decrease that occurs with fixed single-color backlighting systems
Solution Approach 2:
The system changes the spectral parameters by combining multiple LED chips with different emission wavelengths (blue, green, red). This multi-parameter approach allows independent optimization of color saturation through wavelength selection while maintaining luminance through combined light output, overcoming the trade-off present in single-wavelength systems
3Manufacturing precision
If red, green and blue LED chips are used simultaneously to increase NTSC ratio, then color saturation is improved, but the backlight module becomes bulky and high-cost
Solution Approach 1:
Multiple LED chips of different colors (blue, green, red) are merged into a single integrated backlight module structure. By combining these chips in a compact arrangement and sharing common control circuitry and mounting structures, the system achieves high NTSC ratio without the excessive volume that would result from separate modular implementations
4Manufacturing precision
If red, green and blue LED chips are used to increase NTSC ratio, then color saturation is improved, but the control circuitry becomes complex
Solution Approach 1:
The control circuitry is designed with multi-functionality to manage multiple LED chips of different colors. A unified control architecture handles the blue, green, and red LED chips through shared control logic and standardized interfaces, reducing the overall complexity compared to separate control systems for each LED type while maintaining the ability to optimize color saturation
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 achieves high color saturation and NTSC ratios exceeding 72%, with improved transmittance and luminance, surpassing conventional LCD performance.
Implementation Method 1
The backlight module comprises at least one white point source, which emits a spectrum of light having at least three peaks
Implementation Method 2
the color filter substrate comprises a blue filter, a green filter and a red filter
Data Source
AI summary
A liquid crystal display comprising a backlight module and a liquid crystal display panel is provided. The backlight module comprises a white point source that emits a spectrum of light comprising three peaks. The liquid crystal display panel comprises a liquid crystal layer disposed between a color filter substrate, which comprises a blue filter, a green filter and a red filter, and an opposite substrate. The color filter substrate and the backlight module satisfy the following formulas:∑555605BL(λ)×CFRed(λ)×Δλ≤6.0;(1)∑580630BL(λ)×CFGreen(λ)×Δλ≤3.5;(2)∑505580BL(λ)×CFBlue(λ)×Δλ≤3.5.(3)Herein, the backlight module has the maximum luminance in one wavelength, with the maximum luminance being set at 1.0. BL (λ) represents the normalized luminance spectrum at each wavelength. CFBlue(λ), CFGreen(λ) and CFRed(λ) represent the transmittance of light at each wavelength passing through the blue filter, the green filter, and the red filter respectively. Δλ is the wavelength interval.