Dual-Panel LCD Grayscale Extension via Light Superposition
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Solution Overview
Problem
Current liquid crystal display devices are limited by a maximum grayscale of 256 bits, which is insufficient for special or high-end applications, leading to loss of display details and high costs associated with 10-bit display solutions.
Innovation Solution
A dual-box liquid crystal display structure where a first liquid crystal panel adjusts light for a second panel, using different pixel voltages to achieve multiple brightness levels, allowing the second panel to display increased grayscale through superimposed inputs, thereby enhancing color reproduction without the need for separate color filters or additional polarizers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a maximum grayscale of 256 bits is used in conventional liquid crystal display devices, then the driver IC cost is controlled, but the number of display colors is insufficient for special applications or high-end products
Solution Approach 1:
The patent divides the display system into two separate liquid crystal panels: a first panel with 256-grayscale capability that serves as a light source, and a second panel that receives and combines light from multiple brightness levels of the first panel to achieve extended grayscale. This segmentation allows each panel to use cost-effective 256-grayscale driver ICs while the combined system achieves higher color depth.
Solution Approach 2:
The patent implements a nested structure where the first liquid crystal panel is positioned within or adjacent to the second panel, with the first panel's light output being directly utilized by the second panel. The first panel acts as a light source embedded in the display structure, and its multiple brightness levels are superimposed by the second panel to generate extended grayscale without requiring expensive 10-bit driver ICs.
2Loss of information
If 10 bits display is used to increase the number of display colors, then the display detail loss is reduced, but the driver IC cost becomes relatively high
Solution Approach 1:
The patent segments the grayscale generation function across two panels, where the first panel provides multiple discrete brightness levels (256 grayscales) and the second panel combines these levels through light superposition. This approach achieves fine grayscale resolution and reduced display detail loss equivalent to 10-bit display, while each panel can be driven by cost-effective 256-grayscale driver ICs.
Solution Approach 2:
The patent merges the light output from multiple brightness levels of the first panel with the display content of the second panel. By superimposing light from different grayscale levels of the first panel onto the second panel's pixel units, the system achieves extended color depth and reduced information loss without requiring expensive high-bit driver ICs.
3Quantity of substance
If a dual-box liquid crystal display structure with multiple brightness levels is used, then the grayscale levels are increased, but the device complexity increases
Solution Approach 1:
The patent employs a nested dual-panel structure where the first liquid crystal panel is integrated within the overall display assembly and its light output is directly channeled to the second panel. This nested configuration increases grayscale capability through the superposition of multiple brightness levels while maintaining a relatively compact and integrated form factor, avoiding excessive complexity in the overall device structure.
4Quantity of substance
If the first liquid crystal panel uses multiple pixel voltages to provide different brightness levels, then the color reproduction is improved, but the power consumption increases
Solution Approach 1:
The patent implements periodic switching between different pixel voltage levels in the first liquid crystal panel to generate multiple brightness levels. By alternately applying different voltages and using persistence of vision or frame buffering techniques, the system achieves enhanced color reproduction through superimposed grayscale levels while managing power consumption through intermittent rather than continuous high-voltage application.
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 configuration significantly increases the number of grayscale levels displayed by each sub-pixel unit, improving color reproduction by up to 8 times that of conventional displays, while reducing production costs and power consumption.
Implementation Method 1
the first liquid crystal panel is used for adjusting an amount of light of an incident light emitted from the first liquid crystal panel to the second liquid crystal panel
Implementation Method 2
the first liquid crystal panel comprises a first pixel voltage and a second pixel voltage, at the first pixel voltage, the first liquid crystal panel is provided with first brightness, and at the second pixel voltage, the first liquid crystal panel is provided with second brightness
Implementation Method 3
under a superimposed input of the first brightness and the second brightness, the pixel units of the second liquid crystal panel realizes a second numerical grayscale display
Data Source
AI summary
The present invention provides a liquid crystal display device and a control method thereof. The liquid crystal display device includes a first liquid crystal panel and a second liquid crystal panel disposed thereon. The control method of the liquid crystal display device includes following steps of: disposing an applied pixel voltage level of a first liquid crystal panel, selecting a pixel voltage level of the first liquid crystal panel, and displaying grayscale.