Backlight Power Wire Sharing for High-Contrast LCD Dimming
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Solution Overview
Problem
The increasing number of driving devices and light sources in display apparatuses leads to an increase in the number of wires required, which can complicate the substrate design and potentially affect the efficiency and performance of the display.
Innovation Solution
A display apparatus is designed with a substrate that includes a matrix of dimming blocks, where power wires are shared between adjacent rows of dimming blocks, and driving devices control the current to these blocks, minimizing the number of wires needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of driving devices and light sources is increased to implement display apparatuses having high contrast ratios, then the contrast ratio is improved, but the number of wires needed by the substrate increases
Solution Approach 1:
The patent combines multiple functions into shared power wires. Specifically, power wires are designed to supply power to multiple dimming blocks simultaneously, with some power wires supplying power to light sources in both odd and even numbered rows. This merging approach reduces the total number of power wires needed while maintaining the ability to independently control contrast ratios across different display regions.
2Reliability
If the number of driving devices and light sources is increased to implement display apparatuses having high contrast ratios, then the contrast ratio is improved, but the substrate design becomes more complicated
Solution Approach 1:
The patent implements multi-functional power wires that can serve multiple dimming blocks and light source rows simultaneously. The power wire configuration allows a single power wire to supply power to light sources in different rows (both odd and even numbered rows), making the power distribution system more universal and reducing overall substrate design complexity despite the increased number of light sources and driving devices.
Data Source
AI summary
In some embodiments, a display apparatus includes a liquid crystal panel, and a light apparatus including a substrate including a plurality of dimming blocks that are arranged in a matrix, a power wire configured to supply power to the plurality of dimming blocks, and a plurality of driving devices configured to control a driving current supplied to the plurality of dimming blocks. Each dimming block of the plurality of dimming blocks includes a plurality of light sources. A second dimming block of the plurality of dimming blocks is arranged in an (n+1)th row adjacent to the nth row. The power wire is arranged between the nth row corresponding to the first dimming block and the (n+1)th row. The power wire is coupled to a first light source of the first dimming block and to a second light source of the second dimming block.