LCD Backlight Control via Area Segmentation
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Solution Overview
Problem
Liquid crystal display devices have fixed backlight brightness, leading to lower display quality and increased power consumption due to inefficient light control, resulting in a low contrast ratio compared to CRTs.
Innovation Solution
A liquid crystal display device with a screen divided into multiple areas, each equipped with a separate backlight source and a controller that adjusts brightness based on intermediate brightness values derived from video data, allowing for dynamic backlight control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the backlight unit uses a fixed brightness setting, then the device structure is simple, but the display quality is low and power consumption is high
Solution Approach 1:
The backlight unit is divided into multiple independently controllable backlight sources corresponding to different screen areas. Each backlight source can be adjusted separately based on the brightness requirements of its corresponding area, allowing the system to reduce power consumption by dimming or turning off backlight sources in areas that do not require high brightness, while maintaining simple control structures within each segment.
Solution Approach 2:
The backlight brightness is made dynamically adjustable rather than fixed. The controller modifies the brightness of individual backlight sources in real-time based on video data analysis, enabling the system to adapt power consumption to actual display needs while improving overall display quality through optimized brightness distribution.
2Illumination intensity
If the backlight brightness is fixed at maximum, then the display covers all content requirements, but the contrast ratio is low and display quality is reduced
Solution Approach 1:
Different areas of the screen receive different backlight brightness levels according to the actual content requirements of each area. The controller analyzes video data to determine which areas need high brightness and which can use lower brightness, applying local quality optimization to enhance overall display quality and contrast ratio while avoiding the need for uniform maximum brightness across the entire screen.
3Manufacturing precision
If the backlight brightness is actively controlled for each area, then the display quality increases, but the device complexity increases
Solution Approach 1:
The controller serves multiple functions: it processes video data to extract brightness information, divides the screen into multiple areas, analyzes brightness requirements for each area, and controls multiple backlight sources. This multi-functionality reduces the need for separate dedicated components for each control task, thereby managing device complexity while achieving high display quality through active backlight control.
4Illumination intensity
If the backlight unit operates continuously at high power, then the brightness is sufficient, but the heating value increases and power consumption increases
Solution Approach 1:
The backlight sources are controlled to operate periodically rather than continuously, with brightness levels adjusted based on the actual display content. The controller can dim or turn off specific backlight sources when their corresponding screen areas do not require high brightness, reducing overall power consumption and heat generation while maintaining sufficient brightness where needed through on-demand activation.
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 enhances display quality by actively controlling brightness, reduces power consumption, and minimizes heating and brightness deviations between areas, thereby improving the overall performance of the liquid crystal display device.
Implementation Method 1
The liquid crystal display panel 11 of the transmission type liquid crystal display device, as shown in FIG. 1, controls the transmissivity of the light incident from the backlight unit 12 in accordance with video data to display an image.
Implementation Method 2
The lamp of the backlight unit 12 generates a discharge within a discharge tube between an anode and a cathode in accordance with a tube current from an inverter 14 to generate a white light.
Implementation Method 3
The inverter 14 converts a DC power from a power source 13 into an AC power and boosts the AC power to generate the tube current.
Data Source
AI summary
A liquid crystal display device and a controlling method thereof are provided. The liquid crystal display device includes a liquid crystal display panel screen divided into a plurality of areas; a plurality of backlight sources to selectively irradiate light respectively to the divided areas of the screen; and a controller to obtain at least one intermediate brightness value associated with data for at least one of the divided areas and to control a brightness of at least one of the backlight sources corresponding to the at least one divided area according to the at least one intermediate brightness value.