CCFL Backlight Brightness and Contrast Control
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Solution Overview
Problem
Conventional LCD image display devices face challenges in achieving high brightness and long lifespan due to the inverse relationship between brightness and lifespan of CCFL light sources, leading to increased power consumption and reliability issues when adjusting image brightness.
Innovation Solution
An image display device and method that adjust brightness and contrast based on image data, using a brightness determining unit to output backlight and contrast selection signals, and a backlight control unit to adjust the backlight driving voltage, thereby optimizing power consumption and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high current is applied to CCFL to increase brightness, then brightness is improved, but lifespan is reduced
Solution Approach 1:
The patent applies dynamics by making the backlight current adjustable based on image brightness requirements. The system dynamically changes the CCFL driving current from high (for high brightness) to low (for long lifespan) depending on the displayed image content, resolving the contradiction between brightness and lifespan through adaptive control
Solution Approach 2:
The patent changes the operating parameter (current) of the CCFL backlight based on the brightness requirements of different images. By adjusting the current parameter dynamically according to image characteristics, the system achieves both high brightness when needed and long lifespan during normal operation
2Duration of action of stationary object
If low current is applied to CCFL to increase lifespan, then lifespan is improved, but brightness is reduced
Solution Approach 1:
The system dynamically adjusts the backlight current based on image requirements, using low current for normal brightness images to extend lifespan, and switching to high current only when high brightness is specifically required, thus resolving the contradiction between lifespan and brightness
Solution Approach 2:
The patent changes the CCFL current parameter adaptively based on image brightness needs, maintaining low current for normal operation to maximize lifespan while allowing high current when high brightness is required, achieving both goals through parameter adjustment
3Manufacturing precision
If brightness is adjusted for each image, then image quality is improved, but power consumption is increased
Solution Approach 1:
The patent changes the backlight brightness parameter according to image brightness requirements, adjusting the CCFL current to match the displayed image characteristics. This prevents unnecessary power consumption while maintaining optimal image quality, resolving the contradiction between image quality and power consumption
Data Source
AI summary
Provided is an image display device capable of adjusting brightness. The image display device includes a brightness determining unit that determines the brightness of image data, applied from outside, so as to output a backlight selection signal and a contrast selection signal; a backlight control unit that is connected to the brightness determining unit and outputs a backlight driving voltage for supplying backlight with brightness corresponding to the backlight selection signal; a contrast control unit that is connected to the brightness determining unit and outputs an image output signal for outputting an image of which the contrast is adjusted to correspond to the contrast selection signal; and an image display unit that is connected to the backlight control unit and the contrast control unit and receives the backlight driving voltage and the image output signal so as to display an image in which the brightness of the backlight and the contrast of the image data are respectively adjusted.