Backlight Driving Device Time-Division Multiplexing Space Reduction
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Solution Overview
Problem
Conventional local dimming techniques for liquid crystal display (LCD) backlight modules require a large number of connectors and drivers, resulting in significant mechanical space requirements.
Innovation Solution
A backlight driving device with a light source array connected via shared scanning and driving lines, utilizing time-division driving signals to efficiently control backlight units, reducing the need for individual connectors and drivers by using a driving circuit and scanning circuit to output signals that drive rows of backlight units in time-division.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional local dimming technique uses multiple connectors and drivers for each light-emitting region, then brightness control of each region is achieved, but mechanical space requirement increases significantly
Solution Approach 1:
Multiple driving lines are merged into a single shared driving line that serves multiple light-emitting regions. The driving circuit sequentially activates different regions through time-division multiplexing, where the driving line is enabled for one region at a time based on scanning signals. This consolidation reduces the number of physical connectors and drivers needed, directly addressing the space constraint while preserving individual region control capability.
Solution Approach 2:
The driving circuit employs periodic scanning signals to sequentially activate different light-emitting regions. Each region receives driving signals in alternating time intervals, creating a time-division multiplexed operation. This periodic activation allows a single driving line to serve multiple regions over time, eliminating the need for dedicated drivers for each region and reducing mechanical space requirements.
2Ease of operation
If conventional local dimming technique uses multiple drivers for each light-emitting region, then individual region brightness adjustment is achieved, but device complexity increases
Solution Approach 1:
A single driving circuit is designed to perform multiple functions by sequentially controlling different light-emitting regions through time-division multiplexing. The same driving line and driver components are reused across multiple regions at different time intervals, making the driver universal rather than dedicated to each region. This multi-functionality approach reduces the total number of drivers and connectors while maintaining the ability to independently adjust brightness for each region.
Solution Approach 2:
Multiple driving functions are merged into a single driving circuit that handles all light-emitting regions through sequential activation. The driving circuit combines the roles of what would traditionally require multiple separate drivers, using a single shared driving line that is dynamically enabled for different regions based on scanning signals. This merging reduces component count and simplifies the overall device architecture.
Data Source
AI summary
A backlight driving device including a light source array, a driving circuit and a scanning circuit is provided. The light source array includes backlight units electrically connected to scanning lines and driving lines. The driving circuit outputs driving signals to the backlight units through the driving lines, and the driving signals respectively includes driving pulses in different time intervals. The scanning circuit outputs scanning signals to the backlight units through the scanning lines, and the scanning signals respectively includes a start pulse in at least one of the time intervals. The start pulses of the scanning signals respectively correspond to the driving pulses in the same time interval, and drive the backlight units of the each row of the light source array in time-division.