Backlight Segment Control for Multi-Display Boundary Uniformity
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Solution Overview
Problem
In multi-display devices comprising multiple liquid crystal display devices, conventional local dimming techniques lead to unnatural image appearance due to differences in brightness between adjacent areas, particularly around the panel border bezels, causing conspicuous boundaries and increased power consumption.
Innovation Solution
A liquid crystal display device with a backlight divided into segments, where light intensities are determined based on both the image data and peripheral display image data from adjacent devices, ensuring minimal differences in light intensity between adjacent segments, thereby reducing the visibility of 'floating black levels' and optimizing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If local dimming is applied by adjusting light intensity of each segment based on local image luminance, then contrast ratio is improved, but unnatural image appearance occurs at boundaries between adjacent display areas
Solution Approach 1:
The patent merges the local dimming control of adjacent liquid crystal display devices by having each device consider not only its own image data but also the image data displayed on adjacent devices. This combination of data from multiple devices allows coordinated adjustment of backlight segment intensities across device boundaries, eliminating the unnatural brightness differences that previously occurred at panel borders.
2Stability of the object's composition
If light intensity of segments near panel borders is increased to match adjacent display areas, then image uniformity is improved, but power consumption increases
Solution Approach 1:
The patent applies local quality by selectively adjusting the light intensity of only those backlight segments that are necessary to eliminate boundary visibility. Rather than uniformly increasing light intensity across all segments near panel borders, the system precisely identifies and adjusts only the specific segments whose intensities need modification based on the combined image data analysis, thereby maintaining image uniformity while minimizing power consumption.
3Device complexity
If conventional local dimming is used without considering peripheral display data, then device complexity is reduced, but conspicuous boundaries appear between adjacent displays
Solution Approach 1:
The patent introduces an intermediary mechanism where image data from adjacent display devices is transmitted and received as peripheral display data. This intermediary data exchange enables each display device to make informed local dimming decisions that account for neighboring displays, thereby eliminating conspicuous boundaries without requiring complex centralized control systems.
Data Source
AI summary
The liquid crystal display device 30, included in the multi-display device 1, includes (i) a receiving section 21 for receiving display image data indicative of a display image to be displayed on a display panel 11 of the liquid crystal display device 30 and (ii) a light intensity determining section 22 for determining light intensity for each of segments of a backlight device 12 of the liquid crystal display device 30. When the receiving section 21 receives peripheral display image data, which is indicative of a peripheral image contiguous to the display image, the light intensity determining section 22 determines the light intensities of the respective segments based on the display image data and the peripheral display image data.