Backlight Wavelength Control for Crosstalk Compensation
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Solution Overview
Problem
Existing image display devices, particularly those using liquid crystal displays with backlight LEDs, face challenges in reducing power consumption while maintaining image quality due to issues like crosstalk between red, green, and blue light sources, which are not optimized for wavelength regions matching the color filters, leading to inefficient energy use and image quality degradation.
Innovation Solution
The solution involves a memory-based system that stores and adjusts the light-emission wavelength distribution characteristics of LEDs and sub-pixel transmittances, allowing for independent control of red, green, and blue LEDs to minimize power consumption and correct for crosstalk by using crosstalk coefficients to adjust transmittances, ensuring optimal display output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the backlight uses LEDs with fixed wavelength regions, then the device structure is simple, but crosstalk occurs between red, green, and blue light sources and image quality deteriorates
Solution Approach 1:
The patent applies dynamics by making the backlight wavelength regions adjustable rather than fixed. The control unit dynamically changes the wavelength regions of the red, green, and blue LEDs based on the display content and crosstalk compensation requirements, allowing the system to adapt to different imaging conditions and eliminate crosstalk while maintaining simple hardware structure.
Solution Approach 2:
The patent changes the wavelength region parameters of the LED backlight dynamically. By adjusting the wavelength regions of individual color LEDs according to the displayed image characteristics and crosstalk compensation coefficients, the system optimizes color accuracy and eliminates crosstalk without requiring complex hardware modifications.
2Reliability
If the backlight quantity is increased to improve image quality, then the display output is enhanced, but power consumption increases
Solution Approach 1:
The patent dynamically adjusts the backlight quantity and wavelength distribution based on the actual display content and crosstalk compensation needs. The control unit varies the intensity and spectral characteristics of individual color LEDs in real-time, optimizing power consumption while maintaining image quality through adaptive control rather than constant high-power operation.
Solution Approach 2:
The system changes the operational parameters of the backlight including intensity and wavelength region dynamically. By adjusting these parameters according to the displayed image characteristics and crosstalk compensation requirements, the system achieves optimal image quality with minimized power consumption.
3Reliability
If crosstalk compensation is implemented by adjusting wavelength regions, then image quality is improved, but the control complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-calculating and storing crosstalk compensation coefficients in a lookup table before actual display operation. The control unit retrieves these pre-computed coefficients based on the displayed content type, avoiding real-time complex calculations and reducing control system complexity while achieving effective crosstalk compensation.
Solution Approach 2:
The system uses a lookup table that stores pre-computed crosstalk compensation data. Instead of performing complex real-time calculations, the control unit copies and applies pre-determined compensation coefficients from the table, simplifying the control logic while maintaining accurate crosstalk compensation.
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 effectively reduces power consumption while maintaining satisfactory image quality by optimizing the control of backlight quantities and transmittances, stabilizing primary colors and preventing crosstalk, thus enhancing the overall display performance.
Implementation Method 1
a backlight (17) including light-emitting diodes (LEDs)
Implementation Method 2
whose light waves exhibit peaks at wavelengths representing respective primary colors of red, green, and blue
Implementation Method 3
a liquid crystal panel which controls the transmittance of a liquid crystal at each pixel location
Implementation Method 4
each of pixels in the liquid crystal panel includes sub-pixels at which three color filters of red, green, and blue are disposed
Data Source
AI summary
The present invention provides an image display device that forms an image with a display output that is a combination of quantities of backlight of at least three colors and sub-pixel transmittances of at least three colors, comprising:a memory means in which the light-emission wavelength distribution characteristics of the quantities of backlight and the transmission wavelength distribution characteristics of the sub-pixel transmittances are stored, wherein:the light-emission wavelength distribution characteristics and transmission wavelength distribution characteristics are read out from the memory means, and the sub-pixel transmittances based on the quantities of backlight are obtained.