Multi-region Backlight Control via Dual LCD Synchronization
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Solution Overview
Problem
Current multi-region backlight technologies for televisions are limited in achieving smaller regional brightness changes and higher contrast, particularly with the advancement of higher resolution displays like 4K and 8K.
Innovation Solution
A multi-region backlight control system that includes a main controller with a signal decoder, displayer, encoder, image collector, signal processor, and control outputer, which synchronously outputs display and control signals to a color liquid crystal display screen and a non-color liquid crystal display screen, respectively, to adjust light transmittance and achieve precise brightness control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multi-region matrix controller is used to control LED array for regional backlight brightness control, then regional backlight control is achieved, but the complexity of the controller increases and the number of controllable regions is limited
Solution Approach 1:
The patent divides the backlight control into multiple independent LED string units, each controlled by a simple PWM signal. The main controller segments the image signal into multiple regions and generates corresponding PWM duty cycles for each LED string, avoiding the need for a complex matrix controller while achieving precise regional control.
Solution Approach 2:
The patent transitions from a two-dimensional matrix control approach to a one-dimensional PWM duty cycle control approach. By controlling the brightness of each LED string through PWM modulation rather than through a matrix of control lines, the system reduces controller complexity while maintaining regional control capability.
2Manufacturing precision
If the number of backlight LED lights is increased to support higher resolution displays, then display resolution is improved, but the controller complexity and heat dissipation increase
Solution Approach 1:
The patent segments the high-resolution display's backlight into multiple LED strings grouped by regions. Instead of controlling each individual LED, the system controls each string as a unit, significantly reducing the controller's burden while maintaining the ability to achieve pixel-level brightness control through PWM modulation.
Solution Approach 2:
The patent uses the image signal data itself to generate the PWM control signals for each LED string. By copying and processing the luminance information from the image signal, the system derives the appropriate duty cycles without requiring a complex dedicated control structure, thereby supporting high resolution displays with simpler controllers.
3Illumination intensity
If multi-region backlight control is implemented to reduce screen light leakage, then dynamic contrast is improved, but the system cannot achieve pixel-level control and smaller area brightness changes
Solution Approach 1:
The patent implements dynamic PWM modulation for each LED string based on the luminance values of corresponding image regions. By continuously adjusting the PWM duty cycles in real-time according to the displayed image content, the system achieves precise pixel-level brightness control and small-area dimming capabilities, significantly improving dynamic contrast and reducing light leakage.
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 solution enables pixel-level control of backlight brightness, reduces light leakage, and significantly improves dynamic contrast, enhancing user comfort and visual experience.
Implementation Method 1
driving the non-color liquid crystal display screen to adjust light transmittance of each pixel of the non-color liquid crystal display screen, and cooperating with the constant backlight source
Implementation Method 2
simultaneously control the rotation angle of the liquid crystal molecules of the color liquid crystal display screen and the non-color liquid crystal display screen, so that lights of different brightness are transmitted through different pixels
Data Source
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AI summary
Disclosed are a multi-region backlight control system, a multi-region backlight control method, a television and a readable storage medium. The multi-region backlight control system includes a color liquid crystal display screen, a non-color liquid crystal display screen, a first driver, a second driver, a constant backlight source, and a main controller; the color liquid crystal display screen and the non-color liquid crystal display screen are sequentially fixed on the constant backlight source, and the non-color liquid crystal display screen is disposed between the color liquid crystal display screen and the constant backlight source; the main controller is respectively connected with the first driver, the second driver and the constant backlight source, the first driver is electrically connected with the color liquid crystal display screen, and the second driver is electrically connected with the non-color liquid crystal display screen. This application ensures the synchronization of control of the non-color liquid crystal display screen and the color liquid crystal display screen. At the same time, different regional brightnesses and darknesses in the display signal are output by the main controller to the color liquid crystal display screen, so as to synchronously control the switching angle of the liquid crystal molecules in the corresponding region of the non-color liquid crystal display screen to achieve dimming in different regions and improve screen contrast.