Brightness Adjustment Pixel for LCD Ambient Light Compensation
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Solution Overview
Problem
TFT-LCD panels experience a significant decrease in brightness and contrast ratio in outdoor or strong ambient light environments, requiring increased back light brightness, which in turn increases power consumption.
Innovation Solution
Incorporating a brightness adjustment pixel with a thin film transistor, an amplitude control unit, and a switch control unit, connected to a source driving chip, to dynamically adjust display brightness based on ambient light conditions, allowing the liquid crystal display panel to maintain optimal brightness without increasing back light brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If back light brightness is increased to maintain display brightness in outdoor or strong ambient light environments, then display brightness and contrast ratio are improved, but power consumption increases
Solution Approach 1:
The patent segments the pixel array into display pixels and brightness adjustment pixels (white pixels). The brightness adjustment pixels are specifically designated for brightness compensation and can be controlled independently through dedicated data lines, allowing selective brightness enhancement without increasing overall backlight power consumption.
Solution Approach 2:
The patent applies local quality by creating specific brightness adjustment regions (white pixels) with different functional properties from regular display pixels. These white pixels have optimized optical characteristics and are strategically positioned to provide localized brightness enhancement in specific display zones, improving overall visibility without uniform backlight increase.
2Adaptability or versatility
If more control units and external lines are added to implement brightness adjustment, then brightness control capability is improved, but device complexity increases
Solution Approach 1:
The brightness adjustment pixels share the same basic pixel structure and driving mechanisms as display pixels, allowing the display system to perform both normal image display and brightness compensation functions using the same hardware infrastructure. The white pixels can serve as both display elements and brightness adjustment elements.
Solution Approach 2:
The patent implements dynamic brightness adjustment by enabling real-time control of brightness adjustment pixels through dedicated data lines and control units. The brightness level of white pixels can be dynamically modified based on ambient light conditions, display content, and user preferences, providing adaptive brightness 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 solution enhances the brightness and contrast ratio of TFT-LCD panels in challenging light conditions while reducing power consumption by adjusting the display's brightness in response to ambient light, eliminating the need for higher back light brightness.
Implementation Method 1
An electronic field variation is generated with the signals on the TFTs to control the tilted direction of the liquid crystal molecules and to change the transmission rate of the polarized light for achieving display
Data Source
AI summary
The present invention provides an liquid crystal display panel and an liquid crystal display device. The liquid crystal display panel comprises a second substrate. The second substrate comprises a plurality of pixel units. The pixel unit comprises a brightness adjustment pixel which is employed for changing the display brightness of itself to adjust the brightness of the liquid crystal display panel. The contrast ratio and the brightness of the liquid crystal display panel can be raised at outdoor or in a strong ambient light environment and the power consumption can be decreased.