Liquid Crystal Panel Transmittance Control for Black Floating
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Solution Overview
Problem
In liquid crystal display devices, the phenomenon of 'black floating' occurs where black images appear brighter than intended due to high transmittance of adjacent pixels, causing display quality deterioration.
Innovation Solution
An image processing device that classifies display areas into overlapping and non-overlapping regions on a second liquid crystal panel, sets maximum luminance values for each area, and adjusts transmittance of first pixels based on a transmittance coefficient indicating the influence of adjacent pixels on the overlapping area, ensuring balanced light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the transmittance of each pixel in the light control panel is independently determined, then the light control panel can effectively reduce light leakage and improve contrast, but the transmittance of adjacent pixels becomes too high causing black floating phenomenon
Solution Approach 1:
The patent applies local quality by differentiating transmittance control between overlapping and non-overlapping pixels. Overlapping pixels (those sharing boundaries with adjacent pixels) have their transmittance adjusted based on the luminance values of neighboring pixels, while non-overlapping pixels use standard transmittance determination. This localized differentiation prevents black floating in overlapping regions while maintaining effective light control elsewhere.
Solution Approach 2:
The patent implements feedback by using the luminance values of adjacent pixels to adjust the transmittance of overlapping pixels. The transmittance setting unit references the luminance image generation unit's output to determine appropriate transmittance levels, creating a feedback loop that prevents excessive light transmission and eliminates black floating while preserving contrast enhancement.
2Object-affected harmful factors
If the transmittance of overlapping pixels is reduced to suppress black floating, then black floating is suppressed, but the overall light transmission efficiency decreases
Solution Approach 1:
The patent minimizes energy loss by applying transmittance adjustment only to overlapping pixels rather than all pixels. Non-overlapping pixels maintain their standard transmittance settings, ensuring that light transmission efficiency is preserved in regions where it is not compromised by black floating, thus reducing overall energy loss while still suppressing the harmful effect.
Solution Approach 2:
The patent uses partial action by selectively adjusting transmittance only for overlapping pixels that cause black floating, rather than uniformly reducing transmittance across the entire light control panel. This partial adjustment suppresses black floating where necessary while maintaining optimal light transmission in non-overlapping regions, avoiding excessive energy loss.
3Manufacturing precision
If a light control panel with pixel boundary shaping is added to reduce luminance distribution visibility, then luminance distribution becomes less visible and spots are reduced, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the display area into overlapping and non-overlapping regions based on pixel boundary relationships. This segmentation allows for differentiated transmittance control strategies, managing the complexity of dual-panel structures through systematic region classification and targeted processing approaches.
Solution Approach 2:
The patent uses parameter changes by dynamically adjusting the transmittance parameter of overlapping pixels based on adjacent pixel luminance values. This parameter adjustment approach manages the complexity of the dual-panel system by modifying optical properties rather than changing structural design, maintaining luminance uniformity while avoiding excessive device complexity.
Data Source
AI summary
Image processing device comprises a maximum luminance setting unit that associates a maximum luminance value included in a corresponding area of a luminance image with each of a plurality of areas obtained by classifying a display area of a second liquid crystal panel into multiple areas to include an overlapping area overlapping a plurality of first pixels of a first liquid crystal panel for one pixel, an order setting unit that sets the order of the plurality of areas in descending order of maximum luminance values, and a transmittance setting unit that sets the transmittance of the pixel of interest based on the maximum luminance value are provided. The transmittance setting unit sets the transmittance of the pixel of interest based on a transmittance coefficient indicating a proportion at which each of the plurality of first pixels overlapping the overlapping area influences the overlapping area with transmitted light.