LED Driver Circuit Dynamic Energy Saving Without SRAM
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Solution Overview
Problem
Existing LED constant-current driver chips without SRAM inside cannot achieve dynamic energy saving as they lack the necessary SRAM to store frame data and receive frame synchronization signals.
Innovation Solution
An LED driver circuit is designed with a control unit that detects when all data channels are 0 within a predetermined time period, based on an external input signal, and controls all data channels to be in a closed state, thereby achieving dynamic energy saving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If SRAM is added to enable dynamic energy saving detection, then energy saving capability is improved, but device complexity and cost increase
Solution Approach 1:
The LED driver circuit uses its existing data output signals to detect black screen states, eliminating the need for external SRAM. The circuit serves itself by using its own operational data for energy management decisions.
Solution Approach 2:
The data output terminals serve dual purposes: driving LED displays and providing detection signals for black screen detection. This multi-functionality eliminates the need for dedicated SRAM components.
2Device complexity
If black screen detection is implemented without SRAM, then device complexity is reduced, but the ability to detect and respond to black screen states is lost
Solution Approach 1:
The circuit continuously monitors its own data output signals and uses this feedback to detect when all channels are in black screen state (all zeros), enabling real-time energy saving decisions.
Solution Approach 2:
The data output signals act as intermediaries that carry both display information and detection information, allowing the circuit to detect black screen states without additional storage components.
3Loss of energy
If frame synchronization signals are used for energy saving, then energy saving control is improved, but adaptability to systems without frame sync signals deteriorates
Solution Approach 1:
The detection mechanism dynamically adapts to different system configurations by monitoring actual data signals rather than relying on fixed frame synchronization protocols, enabling compatibility with various display systems.
Solution Approach 2:
The detection method changes from synchronous protocol-based detection to data-content-based detection, allowing the circuit to operate in systems with or without frame synchronization signals.
Data Source
AI summary
The present application relates to light-emitting diode (LED) driver circuits, display devices, and display systems. An example LED driver circuit includes: a driver including a plurality of data channels; a controller electrically connected to the driver. The controller is configured to, in response to detecting that data in all the data channels is 0 in a predetermined time period, control all the data channels to be in a closed state. The predetermined time period is determined based on a duration of an external input signal input to the LED driver circuit.