Multiple Primary Colors LCD with Cyan LED Backlight
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Solution Overview
Problem
Current liquid crystal displays, including Field Sequential Color displays, fail to fully cover the range of natural colors due to limitations in color gamut, with NTSC color gamut reaching only up to 92%, which is insufficient for representing all objects' colors.
Innovation Solution
A multiple primary colors liquid crystal display using an LED backlight source with red, green, blue, and cyan LEDs, and a liquid crystal panel with corresponding filters, displaying images through two color frames to achieve a broader color gamut by combining red, green, blue, and cyan lights, with specific wavelength ranges and transmission spectrums to produce a wider range of colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional LED backlight with red, green, blue LEDs and corresponding color filters is used, then the display can show basic colors, but the color gamut is limited to 92% NTSC range which cannot cover all natural colors
Solution Approach 1:
The backlight is segmented into multiple independent LED light bars (red, green, blue, and cyan) instead of using a single white LED with phosphor conversion. Each LED type can be independently controlled to emit specific wavelengths of light, allowing precise control over the color spectrum and enabling expansion of color gamut beyond the traditional 92% NTSC range.
Solution Approach 2:
Multiple types of LEDs are nested within the same backlight module structure, with red, green, blue, and cyan LED light bars arranged in specific patterns. This nested arrangement allows the system to combine multiple primary colors (red, green, blue, and cyan) to achieve a broader color gamut while maintaining a compact display structure.
2Adaptability or versatility
If Field Sequential Color display method is used to expand color gamut, then time-divisional color synthesis is achieved, but the color gamut still cannot cover all objects' colors of nature
Solution Approach 1:
The display time is segmented into multiple sub-frames, with each sub-frame displaying a different color frame (first color frame with red, green, blue LEDs and second color frame with red, cyan LEDs). This temporal segmentation allows the human eye to integrate multiple colors and perceive a broader color gamut, achieving 136% NTSC color gamut coverage.
Solution Approach 2:
The display system uses periodic action by sequentially displaying different color frames in a repeating cycle. The first color frame is displayed for a certain duration, followed by the second color frame, creating a periodic color synthesis that leverages human persistence of vision to achieve expanded color gamut without significant time loss.
3Adaptability or versatility
If cyan LEDs are added to the backlight source and the color filters are modified to transmit cyan light, then the color gamut is expanded to 136% NTSC range, but the device complexity increases
Solution Approach 1:
The backlight is segmented into multiple independent LED light bars (red, green, blue, and cyan) instead of using a single white LED with phosphor conversion. Each LED type can be independently controlled to emit specific wavelengths of light, allowing precise control over the color spectrum and enabling expansion of color gamut beyond the traditional 92% NTSC range.
Solution Approach 2:
Multiple types of LEDs are nested within the same backlight module structure, with red, green, blue, and cyan LED light bars arranged in specific patterns. This nested arrangement allows the system to combine multiple primary colors (red, green, blue, and cyan) to achieve a broader color gamut while maintaining a compact display structure.
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 significantly expands the color gamut to 136% of the NTSC range, enabling the display of all objects' colors and improving display quality and competitive strength by utilizing five primary colors or 128% with four primary colors, while also increasing light transmission rates.
Implementation Method 1
The working principle is that the light of backlight module is reflected to generate images by applying driving voltages to the two glass substrate for controlling the rotations of the liquid crystal molecules
Implementation Method 2
a wavelength range of the cyan light emitted by the cyan LEDs is 490-520 nm
Implementation Method 3
transmission spectrums of the green and the blue filters comprises a wavelength range of cyan light emitted by the cyan LEDs
Data Source
AI summary
The present invention provides a multiple primary colors liquid crystal display and a driving method thereof. The multiple primary colors liquid crystal display comprises a LED backlight source (1) and a liquid crystal display panel (3); the LED backlight source (1) comprises a plurality of red, green, blue and cyan LEDs (11, 12, 13, 14); the liquid crystal display panel (3) comprises a CF substrate (33), and the CF substrate (33) comprises a plurality of red, green and blue filters (331, 333, 335). The red, green and blue LEDs (11, 12, 13) are activated as showing the first color frame, and lights transmitting through the red, green and blue filters (331, 333, 335) respectively are red light R, green light G and blue light B; the red and cyan LEDs (11, 14) are activated as showing the second color frame, and lights transmitting through the red, green and blue filters (331, 333, 335) respectively are the red light R, a first cyan light C1 and a second cyan light C2, capable of basically and completely achieving all objects' colors of nature.