Backlight Control Device Using Differential Transmission
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Solution Overview
Problem
Conventional backlight data transmission interfaces for large-size and high-resolution displays require numerous wires, leading to increased costs, space requirements, complexity, and electromagnetic interference, limiting transmission speed.
Innovation Solution
A backlight control device utilizing a timing control circuitry and local-dimming control circuitry with a differential configuration to transmit control information and brightness data as differential voltage levels, reducing the need for multiple wires through a sequence transmission approach.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional transmission interfaces (SPI, I2C, etc.) are used to control multiple backlight sources, then point-to-point signal transmission is achieved, but the quantity of wires increases significantly
Solution Approach 1:
The patent merges multiple independent transmission interfaces into a single differential transmission interface. Instead of using separate SPI or I2C interfaces for each backlight source, the invention combines all control signals into one differential pair, dramatically reducing wire quantity while maintaining reliable communication through packet-based data transmission.
Solution Approach 2:
The patent introduces a timing control circuit as an intermediary that converts parallel backlight control data into serial packet format suitable for differential transmission. This intermediary component enables efficient signal transmission over a single differential interface while maintaining the functional requirements for controlling multiple backlight sources.
2Adaptability or versatility
If a large amount of wires is used to control multiple backlight sources, then each backlight source can be controlled independently, but the cost for wiring increases
Solution Approach 1:
The patent uses digital packet copying and transmission to replace physical wire multiplication. Instead of creating separate physical connections for each backlight source, the control data is copied into packet format and transmitted sequentially over a single differential interface, maintaining control flexibility while eliminating the need for extensive wiring infrastructure.
3Adaptability or versatility
If numerous wires are used for backlight control, then comprehensive control coverage is achieved, but the space occupied by wiring increases
Solution Approach 1:
The patent transitions from a spatial distribution of multiple wires to a temporal distribution of serial data packets. By moving control information through time (sequential packet transmission) rather than space (parallel wire connections), the invention maintains comprehensive control coverage while minimizing the physical space required for wiring infrastructure.
4Adaptability or versatility
If a large amount of wires is used to control backlight sources, then all backlight sources can be addressed, but the complexity of the system increases
Solution Approach 1:
The patent changes the parameter of data transmission from parallel multi-wire format to serial packet format. By transforming the transmission mode and using packet-based communication with timing control, the system can address multiple backlight sources through a single interface, reducing system complexity while maintaining full addressability of all backlight elements.
5Reliability
If many wires are used for backlight control, then complete signal distribution is achieved, but electromagnetic noise interference increases
Solution Approach 1:
The patent extracts the essential control information from multiple parallel signal lines and consolidates it into a single differential transmission channel. By removing redundant wire connections and keeping only the necessary differential pair, the invention maintains complete signal distribution capability while eliminating the electromagnetic interference generated by numerous parallel wires.
6Reliability
If conventional transmission interfaces are used with many wires, then robust signal transmission is achieved, but the transmission speed cannot be excessively high due to electromagnetic interference
Solution Approach 1:
The patent replaces the mechanical/electrical parallel transmission system with an optical-level differential signaling system. By using differential voltage levels and packet-based communication, the invention achieves both robust noise immunity and high transmission speed, overcoming the fundamental limitation of conventional interfaces where increased wire count forced reduced transmission speed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient control of multiple backlight sources with reduced wiring, lower production costs, and minimized electromagnetic interference, while maintaining high transmission speeds.
Implementation Method 1
The first differential circuit is configured to transmit the transmission packet according to a differential voltage level
Data Source
AI summary
A backlight control device adapted to control a plurality of backlight sources is provided. The backlight control device includes a timing control circuitry and a local-dimming control circuitry. The timing control circuitry is configured to generate a transmission packet according to a first customized content specification, where the transmission packet includes control information and brightness information. The timing control circuitry includes a differential circuit, where the differential circuit is configured to transmit the transmission packet according to a differential voltage level. The local-dimming control circuitry includes a receiving circuit electrically coupled to the differential circuit. The receiving circuit is configured to receive the transmission packet. The local-dimming control circuitry is configured to transmit a light source control signal according to the control information and the brightness information.