Backlight Regulating Circuit for Flicker Reduction in Mini LED Displays
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Solution Overview
Problem
Traditional mini LED backlight control technologies face limitations in dynamically adjusting brightness across varying image dynamic ranges, leading to potential flickering and suboptimal display quality, especially when dealing with low, medium, and high dynamic images.
Innovation Solution
A backlight regulating circuit and method that incorporates a first dimming circuit for PWM signaling, a second dimming circuit for DC signaling, and a selecting circuit to proportionally distribute scanning signals based on control signals, allowing flexible switching between PWM, DC, and mixed dimming modes according to image dynamic range, thereby reducing flickering and improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional single low-frequency PWM dimming is used for brightness control, then the circuit structure is simple, but flickering occurs and display quality deteriorates
Solution Approach 1:
The patent segments the dimming control into multiple independent dimming circuits (first dimming circuit for PWM, second dimming circuit for DC) that can be selectively activated. This segmentation allows the system to choose appropriate dimming methods for different image dynamic ranges, avoiding flicker in high dynamic range images while maintaining simple PWM control for low dynamic range images.
Solution Approach 2:
The patent introduces a selecting circuit that dynamically switches between different dimming circuits based on the image dynamic range. The selecting circuit responds to image characteristics and automatically adjusts which dimming circuit is active, making the system adaptive rather than static. This dynamic adaptation eliminates flicker for high dynamic range images while maintaining simplicity for low dynamic range images.
2Use of energy by moving object
If partitioned control with one-to-one control mode is adopted, then regional brightness adjustment and power consumption reduction are achieved, but the system complexity increases
Solution Approach 1:
The patent designs a universal controlling circuit that can perform multiple functions: it detects image dynamic range, selects appropriate dimming circuits, and controls multiple LED strings. This multi-functional approach consolidates what would otherwise require separate control systems for each LED string, reducing overall system complexity while maintaining the ability to control regional brightness and power consumption.
Solution Approach 2:
The patent changes the control parameter from individual LED string control to image-based dynamic range control. By detecting the overall image dynamic range and adjusting the dimming mode accordingly, the system simplifies control while still achieving power savings through selective dimming of LED strings based on actual display needs.
3Reliability
If high-frequency PWM dimming is used to reduce flickering, then display quality improves, but power consumption increases
Solution Approach 1:
The patent dynamically selects between PWM and DC dimming circuits based on image dynamic range. For high dynamic range images where flicker reduction is critical, the system activates the PWM dimming circuit. For low dynamic range images where flicker is less noticeable, the system switches to DC dimming which consumes less power. This dynamic adaptation optimizes the trade-off between display quality and power consumption.
Solution Approach 2:
The patent changes the dimming method parameter based on image characteristics. Instead of using high-frequency PWM continuously, the system adjusts the dimming parameter (PWM vs DC) according to the image dynamic range detected by the selecting circuit. This parameter change allows the system to achieve high display quality only when necessary, reducing overall power consumption.
Data Source
AI summary
A backlight regulating circuit includes a first dimming circuit, a second dimming circuit and a selecting circuit, where the first dimming circuit is configured to conduct a PWM signal line and a driving chip in response to a signal of the scanning signal line; the second dimming circuit is configured to conduct a DC signal line and the driving chip in response to the signal of the scanning signal line; the first dimming circuit and the second dimming circuit are connected to the scanning signal line through the selecting circuit; and the selecting circuit is configured to proportionally distribute the signal of the scanning signal line to the first dimming circuit and the second dimming circuit in response to a control signal dynamically output by a control signal line according to an image.