Backlight Pixel Driving Circuit With PWM-Synced Analog Power Gating
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Solution Overview
Problem
Existing mini-LED backlight units face challenges in reducing current consumption of the analog circuit block, particularly in PWM and PAM driving methods, where further efficiency improvements are needed.
Innovation Solution
A backlight pixel driving circuit that controls the on-off of the analog circuit block using a channel enable signal synchronized with a pulse width modulation (PWM) or scan signal, dynamically managing the operation of the analog circuit to reduce current consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the analog circuit block operates continuously to ensure stable backlight pixel driving, then the reliability is improved, but the current consumption increases
Solution Approach 1:
The patent applies periodic action by controlling the analog circuit block to operate only during specific periods when PWM signals are active. The channel enable signal is generated synchronously with the PWM signal, turning the analog circuit block on during PWM periods and off during non-PWM periods. This periodic operation reduces current consumption while maintaining reliable backlight pixel driving when needed.
Solution Approach 2:
The patent implements dynamics by dynamically controlling the on-off state of the analog circuit block based on the PWM signal timing. Instead of continuous operation, the circuit block's operational state changes dynamically according to the PWM signal presence, allowing the system to adapt between reliability and power consumption requirements.
2Use of energy by moving object
If the analog circuit block is turned off to reduce current consumption, then the energy efficiency is improved, but the response time and reliability may deteriorate
Solution Approach 1:
The patent applies preliminary action by generating the channel enable signal synchronously with the PWM signal, ensuring the analog circuit block is activated in advance or simultaneously with the PWM signal arrival. This timing coordination ensures the circuit block is ready to respond immediately when PWM signals occur, maintaining fast response time while allowing the block to remain off during non-PWM periods for power savings.
3Speed
If the analog circuit block operates continuously to maintain ready state, then the response time is improved, but the power consumption increases
Solution Approach 1:
The patent resolves this contradiction by using periodic action to activate the analog circuit block only during PWM signal periods. The channel enable signal synchronizes the circuit block's operation with PWM timing, allowing fast response during active periods while reducing power consumption during inactive periods when the block is turned off.
Solution Approach 2:
The patent applies parameter changes by dynamically changing the operational state parameter of the analog circuit block based on PWM signal timing. The circuit block transitions between active and inactive states, changing its operational parameters to balance response time requirements with power consumption reduction.
Data Source
AI summary
A backlight pixel driving circuit includes an interface unit configured to receive dimming data, a storage unit configured to store the received dimming data, a controller configured to drive a backlight pixel based on the dimming data, and an analog circuit block, wherein the controller generates a channel enable signal synchronized with a pulse width modulation signal and controls the on-off of the analog circuit block using the channel enable signal. Accordingly, an effect of reducing current consumption may be further increased as an analog circuit block itself of a light-emitting diode (LED) driving circuit is dynamically turned on and off.