Backlight Drive Voltage Control for Partitioned Display Panels
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The increasing quantity of partitions in display apparatuses leads to challenges in driving capability, power loss during standby mode, inaccurate power supply voltage regulation, flickering due to varying black insertion times, and excessive temperature affecting component life, which impact display quality and reliability.
Innovation Solution
A display apparatus with a backlight assembly that includes light sources and drive groups, a controller to adjust voltage based on detection signals, and a method to control light emission using drive data and detection signals, optimizing power supply and reducing signal transmission while managing temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the quantity of partitions on the light board is increased to improve display quality, then the driving capability of the drive circuit becomes insufficient
Solution Approach 1:
The light board is divided into multiple partitions, with each partition independently controllable by the drive circuit. This segmentation allows the system to manage higher resolution and better display quality by controlling individual partitions rather than treating the entire light board as a single unit, thereby maintaining driving capability while improving display quality.
2Ease of operation
If stepped power supply is used to provide power to the mainboard and backlight assembly simultaneously, then power loss occurs during standby mode due to leakage current
Solution Approach 1:
The power supply circuit switches between different power supply modes based on the operational state of the display apparatus. During standby mode, the circuit provides power sequentially or selectively to different components rather than simultaneously, thereby reducing leakage current and power loss while maintaining the ability to power both mainboard and backlight assembly when needed.
3Adaptability or versatility
If fixed black insertion time is used in variable refresh rate, then flickering occurs due to different refresh rates
Solution Approach 1:
The black insertion time is dynamically adjusted based on the current refresh rate. As the refresh rate changes, the black insertion time is proportionally modified to maintain a consistent black insertion ratio, thereby preventing flickering while preserving the adaptability of variable refresh rate functionality.
4Temperature
If temperature threshold control is used to reduce output current, then image flickering occurs and control accuracy is low
Solution Approach 1:
The system continuously monitors the temperature of the backlight assembly and provides feedback to the drive circuit. Based on this feedback, the drive circuit dynamically adjusts the output current in a controlled manner that prevents image flickering while maintaining accurate backlight control. The feedback mechanism enables precise temperature management without sacrificing control accuracy.
Data Source
AI summary
A display apparatus comprises a controller, comprising at least one input terminal, and connected to the at least one drive group via the at least one input terminal, wherein the controller is configured to: during a first time period, transmit drive data to a drive group of the at least one drive group via an input terminal of the at least one input terminal, to drive light sources corresponding to the drive group to emit light; during a second time period, receive a detection signal transmitted from the drive group via the input terminal of the controller, wherein the detection signal indicates the voltage state of the light sources corresponding to the drive group as detected by the drive group.