Local Dimming Backlight Layout for Higher Display Contrast
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Solution Overview
Problem
Existing display apparatuses face inefficiencies due to fixed numbers of dimming blocks and driving devices, leading to deactivated circuits and suboptimal control of light sources, which affects image contrast ratios.
Innovation Solution
A display apparatus with a substrate featuring distinct layouts of dimming blocks and driving devices, including first and second driving devices with different pin configurations and arrangements, allowing for flexible control of light sources in rows and columns, and a dimming driver to manage these devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the number of dimming blocks and driving devices is fixed, then the device structure is simplified, but some driving circuits must be deactivated leading to suboptimal control
Solution Approach 1:
The patent makes the dimming block layout dynamic by providing two different layout configurations (first layout and second layout) that can be switched based on control signals. This allows the display apparatus to adaptively optimize the arrangement of dimming blocks and driving devices, preventing circuit deactivation while maintaining manageable device complexity through standardized layout patterns.
2Reliability
If distinct layouts of dimming blocks and driving devices are implemented, then light source control is optimized, but device complexity increases
Solution Approach 1:
The patent segments the display panel into multiple regions with different layout configurations. By dividing the display area into zones that can use either the first layout or second layout of dimming blocks and driving devices, the system achieves optimized light source control in each segment while managing overall complexity through modular, repeatable patterns.
Solution Approach 2:
Different regions of the display panel are assigned different layout qualities - some regions use the first layout configuration while others use the second layout configuration. This local differentiation allows each region to be optimized for its specific requirements, improving overall light source control without requiring the entire device to adopt a single complex configuration.
3Illumination intensity
If variable dimming block layouts are used, then image contrast ratio is enhanced, but manufacturing complexity increases
Solution Approach 1:
The patent employs asymmetric layout configurations where the arrangement of dimming blocks and driving devices differs between the first layout and second layout. This asymmetric design enables enhanced image contrast ratio by optimizing light distribution patterns, while the asymmetry is implemented through standardized, repeatable patterns that can be manufactured using conventional processes.
Solution Approach 2:
The patent changes the arrangement parameters of dimming blocks and driving devices between different layouts, specifically altering the spatial relationships and connectivity patterns. These parameter changes are achieved through controlled variations in the layout configuration that can be implemented during manufacturing using standard fabrication techniques, balancing performance enhancement with manufacturing feasibility.
Data Source
AI summary
A display apparatus includes a liquid crystal panel; a plurality of light sources configured to emit light; a substrate including a plurality of dimming blocks arranged in rows and columns, each dimming block of the plurality of dimming blocks including at least one light source of the plurality of light sources; a first driving device configured to control a driving current applied to light sources in first dimming blocks of the plurality of dimming blocks; and a second driving device configured to control a driving current applied to light sources in second dimming blocks of the plurality of dimming blocks, wherein the first dimming blocks, the second dimming blocks, the first driving device, and the second driving device are arranged on a first side of the substrate, and a layout of the first dimming blocks is different from a layout of the second dimming blocks.