Backlight Driving Circuit Time-Division Control
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Solution Overview
Problem
The complexity and increased production cost of backlight driving circuits in Mini-LED displays due to the requirement of a constant current source for each light-emitting unit.
Innovation Solution
A backlight driving circuit design that includes a light-emitting module with two units connected to different power supply signals, a light-emitting control module to control them in a time-division manner, and a shared constant current source, allowing the units to share the same current source, simplifying the circuit structure and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a constant current source is included in the backlight driving circuit for each light-emitting unit, then the LED driving chip can drive the light-emitting units, but the circuit design becomes complicated and production cost increases
Solution Approach 1:
The patent merges the constant current source function into a shared resource that serves multiple light-emitting units simultaneously. Instead of having separate constant current sources for each LED unit, a single constant current source is designed to supply current to multiple units through time-division multiplexing, thereby reducing circuit complexity while maintaining reliable constant current control.
Solution Approach 2:
The constant current source is designed with universal functionality to serve multiple light-emitting units. The same constant current source circuit is reused across different time periods to drive different LED units, making the circuit element multi-functional and reducing the overall number of components needed in the driving circuit.
2Reliability
If a constant current source is included in the backlight driving circuit for each light-emitting unit, then the LED driving chip can drive the light-emitting units, but production cost increases
Solution Approach 1:
By combining multiple light-emitting unit drives into a single constant current source, the patent reduces the total number of circuit components that need to be manufactured and assembled. This merging approach directly lowers production costs while maintaining the necessary constant current control for reliable LED operation.
Solution Approach 2:
The universal constant current source design allows a single circuit module to serve multiple functions across different time periods. This multi-functionality reduces the bill of materials and assembly complexity, thereby reducing production costs while ensuring reliable constant current delivery to each LED unit when activated.
3Illumination intensity
If multiple light-emitting units are controlled simultaneously, then the brightness can be maintained, but the circuit structure becomes complex requiring individual constant current sources
Solution Approach 1:
The patent employs periodic action by controlling multiple light-emitting units in alternating time periods rather than simultaneously. The first light-emitting unit is driven during a first time period, and the second light-emitting unit is driven during a second time period. This time-division approach maintains overall brightness while using a single shared constant current source, avoiding the need for complex simultaneous multi-source circuitry.
Solution Approach 2:
The system dynamically switches between different light-emitting units based on time periods. The constant current source is dynamically allocated to different LED units as needed, rather than being statically assigned to each unit. This dynamic time-division multiplexing maintains illumination requirements while simplifying the circuit structure through resource sharing.
Data Source
AI summary
The present application provides a backlight driving circuit and a display device. The backlight driving circuit includes a light-emitting module, a light-emitting control module, and a constant current source. Wherein the light-emitting module includes a first light-emitting unit for receiving a first power supply signal and a second light-emitting unit for receiving a second power supply signal. A first connection terminal of the light-emitting control module is electrically connected to the first light-emitting unit, and a second connection terminal is electrically connected to the second light-emitting unit to control the first light-emitting unit and the second light-emitting unit to emit light in a time-division manner.