Backlight Drive Chip Series Layout for Stable Power Voltage
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Solution Overview
Problem
The increasing number 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 comprising drive groups of first and second drive chips connected in series, each driving light-emitting unit groups, and a controller to manage light emission based on drive data and channel quantity, along with a power supply circuit to optimize power distribution and temperature management.
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 requirements increase, but the device complexity and power loss increase
Solution Approach 1:
The backlight assembly is divided into multiple partitions on the light board, with each partition independently controllable. This segmentation allows high display quality through fine-grained control while managing complexity by organizing the system into modular units that can be driven systematically
Solution Approach 2:
The drive circuit dynamically adjusts driving parameters based on the increased number of partitions, optimizing the driving waveform and timing for each partition to maintain reliability while handling the increased complexity
2Productivity
If stepped power supply is used to provide power to mainboard and backlight assembly simultaneously, then power distribution efficiency improves, but power loss increases during standby mode
Solution Approach 1:
The power supply circuit dynamically switches between different power supply modes: during normal operation, stepped power supply provides efficient simultaneous power distribution; during standby mode, it transitions to a low-power mode that prevents leakage current, thus adapting to different operational states to minimize energy loss
Solution Approach 2:
The power supply voltage and current parameters are dynamically adjusted based on operational state. During standby, the power supply parameters are changed to eliminate leakage current generation in the backlight assembly, reducing energy loss while maintaining the ability to quickly transition to full-power operation
3Measurement precision
If power supply voltage is regulated based on feedback from drive chip to ensure accuracy, then power supply precision improves, but the quantity of signals transmitted increases
Solution Approach 1:
The feedback signal for power supply voltage regulation is merged with the existing data transmission channel between the drive chip and controller. By combining multiple functions (drive data transmission and power supply feedback) into a single communication path, the patent reduces the total quantity of signals while maintaining precise voltage regulation through the fed back electrical signals
Data Source
AI summary
A display apparatus comprises a backlight assembly, comprising: at least one drive group, wherein one drive group comprises at least one first drive chip and at least one second drive chip, a quantity of channels of a first drive chip differs from a quantity of channels of a second drive chip, and the at least one first drive chip and the at least one second drive chip are connected in series; and at least one light-emitting unit group, wherein one light-emitting unit group comprises a plurality of light sources, each of the plurality of light sources is connected to the first drive chip or the second drive chip via a channel of the first drive chip or the second drive chip.