Dual-Layer LCD Panel Brightness Control for Power Reduction
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Solution Overview
Problem
Conventional liquid crystal display apparatuses with a double panel structure increase total power consumption due to higher emission brightness of the backlight unit, which is not efficiently managed for images with high frequency components, limiting contrast ratio improvement.
Innovation Solution
An image display apparatus with a light emitter, a first panel, and a second panel, where the emission brightness of the light emitter and the transmittance of both panels are controlled based on input image data to reduce power consumption while maintaining display brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the emission brightness of the backlight unit is increased to compensate for light loss through two liquid crystal panels, then the display brightness is maintained, but the total power consumption is increased
Solution Approach 1:
The patent implements dynamic control of both the backlight emission brightness and the transmittance of the two liquid crystal panels based on the displayed image characteristics. The controller adjusts these parameters in real-time to optimize the balance between display brightness and power consumption, rather than using fixed high brightness settings
Solution Approach 2:
The system changes multiple parameters simultaneously - the emission brightness of the backlight unit and the transmittance of both liquid crystal panels - to achieve the desired display performance while reducing power consumption. This multi-parameter optimization allows for more efficient light utilization
2Illumination intensity
If the local dimming control is used to improve contrast ratio, then the bright and dark parts are enhanced, but the minimal region size is larger than the liquid crystal element size, limiting effectiveness for high frequency components
Solution Approach 1:
The patent divides the control into two independent layers: the backlight unit and the two liquid crystal panels. Each layer can be controlled independently with different spatial resolutions, allowing the liquid crystal panels to provide fine-grained control for high frequency components while the backlight provides broader dimming zones
Solution Approach 2:
The patent adds an additional control dimension by introducing a second liquid crystal panel between the backlight and the color liquid crystal panel. This creates a multi-layer optical path that enables more precise local control of light transmission, effectively resolving the spatial resolution limitation of conventional single-panel local dimming
3Illumination intensity
If the double panel structure is used to improve contrast ratio, then the light transmission is better controlled, but the power consumption is increased due to higher backlight emission brightness
Solution Approach 1:
The controller receives image data and uses this information to feedback-adjust the emission brightness of the backlight unit and the transmittance of both liquid crystal panels. This closed-loop control ensures that power is consumed only when and where needed to achieve the desired contrast ratio
Solution Approach 2:
Instead of maintaining high backlight brightness across the entire display area, the system applies partial action by controlling the backlight and panel transmittance locally based on image requirements. This reduces overall power consumption while maintaining contrast ratio where needed
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
The solution effectively reduces the total power consumption of the image display apparatus while maintaining display brightness, improving the contrast ratio by dynamically controlling emission brightness and transmittance of the panels.
Implementation Method 1
a light emitter; a first panel configured to transmit light emitted from the light emitter; and a second panel configured to transmit light transmitted through the first panel
Data Source
AI summary
An image display apparatus according to the present invention, includes a light emitter, a first panel configured to transmit light emitted from the light emitter, a second panel configured to transmit light transmitted through the first panel, and a controller configured to control emission brightness of the light emitter and at least one of transmittance of the first panel and transmittance of the second panel, based on input image data.