Backlight Power Voltage Control for Flicker-Stable Partitioned Displays
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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, flickering due to inconsistent black insertion times, and excessive temperature affecting component life, necessitating improvements in power supply voltage regulation and backlight control.
Innovation Solution
A display apparatus with a power supply circuit, processor, and backlight assembly, where drive chips drive light-emitting unit groups through sequential power and signal output, and processors adjust power supply voltage based on current-voltage relationships to optimize backlighting and reduce power consumption.
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 must be improved, but the device complexity and power consumption increase
Solution Approach 1:
The light board is divided into multiple partitions, and each partition is independently controlled by separate drive circuits. This segmentation allows the system to achieve high display quality through multiple zones while managing complexity by dividing the driving task across multiple independent circuit modules rather than requiring one complex high-capacity driver.
Solution Approach 2:
The patent introduces a multi-dimensional control architecture where drive circuits are arranged in both horizontal and vertical dimensions, enabling comprehensive coverage of the light board. This spatial arrangement allows the system to drive numerous partitions without proportionally increasing signal complexity, as the dimensional organization provides systematic control pathways.
2Use of energy by moving object
If stepped power supply is used to provide power source signals to the mainboard and backlight assembly simultaneously, then power distribution efficiency is improved, but power loss increases during standby mode due to leakage current
Solution Approach 1:
The power supply system dynamically adjusts its operation mode based on the display apparatus state. During normal operation, stepped power supply provides efficient power distribution to multiple components. During standby mode, the system transitions to a different power supply configuration that eliminates or reduces leakage current paths, thereby reducing power loss while maintaining distribution efficiency when needed.
Solution Approach 2:
The patent changes power supply parameters (voltage levels, current paths) based on operational requirements. By adjusting power supply parameters dynamically - using different voltage levels and current configurations for normal operation versus standby mode - the system achieves both efficient power distribution and reduced power loss at different operational states.
3Illumination intensity
If variable refresh rate technology is used to dynamically adjust display cycle, then display quality and smoothness are improved, but flickering occurs due to fixed black insertion time length
Solution Approach 1:
The black insertion time length is made dynamic rather than fixed. The system automatically adjusts the black insertion duration based on the current refresh rate, ensuring that the proportion of black insertion time relative to the total display cycle remains appropriate at any refresh rate. This dynamic adjustment eliminates flickering while preserving the quality improvements from variable refresh rate technology.
Solution Approach 2:
The system implements feedback control where the black insertion time is continuously adjusted based on the actual refresh rate being used. By monitoring the refresh rate and automatically compensating by adjusting black insertion duration, the system maintains stable image display without flickering, even as refresh rates vary to optimize display quality for different content types.
Data Source
AI summary
A display apparatus, a method for controlling the display apparatus. The method comprises obtaining image data, and a frame start trigger signal and a row synchronization signal for a frame, wherein the image data comprises backlight data; determining a display period for a frame of image based on the frame start trigger signal and the row synchronization signal; wherein the display period of the frame of image comprises M black insertion periods each with a black insertion time length, and a light-emitting period comprising N first light-emitting periods each with a first light-emitting time length and P second light-emitting periods each with a second light-emitting time length, wherein the M and N are both integers greater than or equal to 1, and the P is an integer greater than or equal to 0; and during the light-emitting period, determining initial dimming data based on the backlight data.