Local Dimming Backlight Layout With Reduced PCB Signal Wiring
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Solution Overview
Problem
Existing display apparatuses face challenges with excessive signal wiring and multiple layers on printed circuit boards, which complicate the design and hinder efficient operation.
Innovation Solution
The display apparatus minimizes signal wiring and reduces the number of layers by optimizing the arrangement of driving devices and signal lines on a single substrate, using a substrate with non-intersecting timing, data, and power lines, and incorporating jumper connectors to separate driving lines from power and data lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple driving devices and light sources are used to achieve high contrast ratio, then the contrast ratio is improved, but the signal wiring and layering on the printed circuit board become excessive and complex
Solution Approach 1:
The patent merges the driving device and light source onto a single substrate, eliminating the need for separate wiring between them. The driving device includes output pins that directly connect to light sources via wire bonds, and serial communication is achieved through daisy-chaining driving devices together, reducing overall signal wiring complexity
Solution Approach 2:
The patent transitions from a two-dimensional PCB wiring approach to a three-dimensional integration where driving devices and light sources coexist on the same substrate plane. This spatial reorganization allows direct connections and serial daisy-chaining, eliminating the need for multiple PCB layers and complex routing
2Adaptability or versatility
If multiple driving devices are used to control multiple dimming blocks, then local dimming control is improved, but the number of signal lines and wiring required increases
Solution Approach 1:
The patent segments the backlight system into multiple independent dimming blocks, each controlled by a dedicated driving device. This segmentation enables precise local dimming control while managing complexity through modular architecture where each segment operates semi-independently
Solution Approach 2:
Each driving device is designed with universal functionality to control one or more light sources within a dimming block. The driving devices can be daisy-chained in series, allowing a single communication protocol to control multiple devices, thereby reducing the total number of signal lines required
Data Source
AI summary
A display apparatus includes a liquid crystal panel; and a light source apparatus. The light source apparatus includes a substrate comprising a first side directed to the liquid crystal panel; at least one dimming block disposed on the first side of the substrate and each comprising at least one light source; at least one driving device disposed on the first side of the substrate and each configured to drive the at least one dimming block; and at least one signal line disposed on the substrate. The at least one signal line includes: a timing line configured to transmit a timing signal to the at least one driving device, a data line configured to transmit a data signal to the at least one driving device, or a power line configured to transmit a power signal to the at least one driving device.