LCD Backlight Color Control for Brightness and Power
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Solution Overview
Problem
Liquid crystal display (LCD) technologies face challenges in balancing brightness, color gamut, contrast, and power consumption due to the mismatch between backlight spectral energy and displayed image spectral energy, leading to inefficient light usage and increased power consumption.
Innovation Solution
A system for coordinated color control of LCD backlights and filters, which adjusts backlight color and intensity in conjunction with filter transmittance to optimize display pixel colors, using a processor to determine optimal drive levels for each segment of the image based on its color characteristics, thereby reducing power consumption and improving luminous efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If filters with narrower wavelength bandwidth are used, then color saturation is improved, but brightness and luminous efficacy deteriorate
Solution Approach 1:
The patent changes the spectral parameters of the backlight source by using multiple LED types with different spectral characteristics (narrow-band LEDs at specific wavelengths like 450nm, 530nm, 630nm combined with broader-band LEDs) to optimize the match between backlight spectrum and filter transmission bands, thereby improving both color saturation and brightness simultaneously
2Illumination intensity
If filter wavelength bandwidth is increased, then brightness is improved, but color gamut deteriorates
Solution Approach 1:
The patent optimizes the spectral bandwidth parameters of the backlight by selecting LED types with specific wavelength bandwidths that match the filter transmission characteristics, ensuring sufficient brightness while maintaining narrow spectral bands for high color gamut
3Illumination intensity
If backlight intensity is increased, then display brightness is improved, but power consumption increases and contrast deteriorates
Solution Approach 1:
The patent changes the spectral distribution parameters of the backlight to match the image spectral requirements, reducing wasted light energy and enabling lower overall backlight intensity while maintaining required display brightness, thereby reducing power consumption
Solution Approach 2:
The system uses sensors to detect the spectral characteristics of the displayed image and provides feedback to the controller, which adjusts the backlight spectral composition and intensity in real-time to match the image requirements, optimizing power consumption
4Ease of manufacture
If traditional fluorescent backlight with fixed phosphors is used, then manufacturing is simplified, but spectral energy matching with displayed image deteriorates
Solution Approach 1:
The patent replaces the static fluorescent backlight with a dynamic multi-LED backlight system where the spectral composition can be adjusted by selectively activating different LED types based on the spectral requirements of the displayed image content
Solution Approach 2:
The system dynamically changes the spectral parameters of the backlight by varying the intensity ratios of different LED types to match the spectral energy distribution of the displayed image, significantly reducing energy loss
5Manufacturing precision
If LED backlight with narrow bandwidth is used, then crosstalk among color components is reduced, but spectral energy matching with displayed image deteriorates
Solution Approach 1:
The patent uses a composite backlight system combining multiple narrow-band LED types (blue 450nm, green 530nm, red 630nm) with broader-band LEDs to create a multi-spectral light source that maintains color separation while providing sufficient spectral coverage for efficient energy matching
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 enhances display brightness, reduces power consumption, and increases color gamut by optimizing backlight power usage and filter transmittance, resulting in improved image quality and energy efficiency.
Implementation Method 1
a liquid crystal panel with a matrix of pixels, each pixel having three or more color filters
Implementation Method 2
Light-emitting diode (LED) backlight technology
Data Source
AI summary
The system for coordinated color control of LCD backlight and filters comprises a display pixel, a light source driver, a filter driver, and a processor. The light source driver sets a backlight color and a backlight intensity level for the display pixel. The filter driver sets an array of filter levels for three or more filters for the display pixel. The processor is configured to determine the backlight color and the backlight intensity level and the array of filter levels to target a desired color and intensity for the display pixel. The array of filter levels is determined based at least in part on the backlight color and the backlight intensity level.