RGBW LCD Panel with Multi-Color LED Backlight
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional LCD devices with LED backlight units have low light efficiency due to the use of RGB color filters, which limits the color realization ratio and brightness, especially when compared to RGBW-type LCD devices that utilize fluorescent lamps.
Innovation Solution
The implementation of an LCD device with an LED backlight unit comprising at least five colors, including red, green, blue, white, cyan, yellow, and magenta LEDs, which converts input data of three colors into four colors and arranges them across multiple sub-frames to optimize light emission and color representation, enhancing the color realization ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If RGB color filters are used in conventional LCD devices with LED backlight units, then the device structure is simple and manufacturing is easier, but the light efficiency and color realization ratio are low
Solution Approach 1:
The invention segments the color generation process by dividing the pixel structure into multiple sub-pixels with different color filters (RGBW type with red, green, blue, and white sub-pixels). This segmentation allows the white sub-pixel to transmit more light without requiring a color filter, thereby improving light efficiency while maintaining manufacturing feasibility through standardized pixel array fabrication processes.
Solution Approach 2:
The invention applies local quality by creating different optical properties in different regions of the pixel array. Specifically, white sub-pixels are designed without color filters to maximize light transmission, while RGB sub-pixels retain color filters for color accuracy. This localized optimization improves overall light efficiency without compromising color representation.
2Illumination intensity
If RGBW-type LCD device is used with fluorescent lamp backlight, then brightness is improved by mixing white light with red, green and blue light, but the device complexity increases and LED backlight compatibility is lost
Solution Approach 1:
The invention makes the LCD panel structure universal by designing it to work with LED backlight units while maintaining the RGBW pixel architecture. The panel can achieve high brightness through its structural design (white sub-pixels without color filters) rather than relying on specific backlight types, making it compatible with energy-efficient LED backlights while preserving brightness advantages.
Solution Approach 2:
The invention changes the optical parameters of the pixel structure by removing color filters from white sub-pixels and adjusting the arrangement of RGBW sub-pixels. This parameter change enables the display to achieve high brightness through structural optimization rather than through complex backlight mixing mechanisms, simplifying the overall device while maintaining performance.
3Measurement precision
If color filters are arranged in respective sub-pixels of red, green and blue colors, then color accuracy is maintained, but only one third of the applied light is transmitted reducing light efficiency
Solution Approach 1:
The invention segments the pixel array into four types of sub-pixels (red, green, blue, and white) rather than using only three color-filtered sub-pixels. The white sub-pixels are specifically designed without color filters to transmit maximum light, while RGB sub-pixels maintain color filters for accurate color representation. This segmentation resolves the contradiction by dedicating specific regions to different functions.
Solution Approach 2:
The invention applies local quality by creating different optical characteristics in different sub-pixel regions. White sub-pixels have no color filter for maximum light transmission, while RGB sub-pixels have color filters for accurate color rendering. This localized differentiation allows the display to achieve both high light efficiency and color accuracy simultaneously.
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 approach significantly improves the color realization ratio and brightness of the LCD device by effectively utilizing the LED backlight unit to mix and emit white, cyan, yellow, and magenta lights, thereby enhancing the display's color accuracy and efficiency.
Implementation Method 1
A backlight unit includes LEDs of at least five colors to emit the light to the LCD panel
Implementation Method 2
an LCD panel that includes red, green, blue and white sub-pixels... An electric field is formed in accordance with a data signal, to thereby display the desired image by controlling the transmittance of light passing through the liquid crystal layer
Data Source
AI summary
An apparatus and method for driving an LCD device is provided. The apparatus includes an LCD panel that is comprised of red, green, blue and white sub-pixels. A data converter converts input data of three colors into input data of four colors. A data driver converts the input data of four colors into a video signal, and supplies the video signal to each sub-pixel. A gate driver supplies a scan pulse to each sub-pixel. A timing controller arranges the input data of four colors supplied from the data converter and then supplies the arranged data to the data driver. A backlight unit is comprised of LEDs of at least five colors to emit the light to the LCD panel. A backlight controller controls the backlight unit in accordance with the input data of three colors and the sub-frame control signal.