Backlight Dimming Control Using Drive-Unit Voltage States
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Solution Overview
Problem
Existing display devices face challenges in reducing power loss in the back light circuit without affecting data display performance.
Innovation Solution
A control method for a dimming controller that adjusts the voltages of power supply terminals of light-emitting units based on the voltage states of drive units, using a voltage conversion module to manage undervoltage, overvoltage, and steady states, thereby optimizing power consumption and display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the back light circuit operates at high power to ensure display quality, then display performance is improved, but power loss increases
Solution Approach 1:
The patent applies dynamics by making the back light circuit's operating parameters adjustable rather than fixed. The controller dynamically modifies drive signals based on detected voltage states (undervoltage, overvoltage, or steady state), allowing the system to adapt power consumption levels to actual operational conditions while maintaining display quality.
Solution Approach 2:
The patent changes operational parameters by monitoring voltage states and adjusting drive signals accordingly. When undervoltage or overvoltage conditions are detected, the controller modifies the drive signal parameters to optimize power consumption, transforming the back light circuit from a static high-power operation to a dynamic parameter-adjustment system.
2Measurement precision
If additional sensors are added to detect voltage states, then power consumption control precision is improved, but device complexity increases
Solution Approach 1:
The patent applies self-service by enabling the back light circuit to self-diagnose its voltage state through built-in detection capabilities without requiring external sensors. The circuit monitors its own operational status (undervoltage, overvoltage, or steady state) and provides this information to the controller, eliminating the need for additional sensing components.
Solution Approach 2:
The patent makes existing components multi-functional by enabling them to perform both their primary functions and voltage state detection. The drive units and control terminals are designed to serve dual purposes: driving the light-emitting units and simultaneously monitoring voltage conditions, thereby eliminating the need for separate dedicated sensors.
Data Source
AI summary
A control method, a dimming controller, and a display device, the method including: acquiring a voltage state of each output channel of any number of drive units, where the voltage state includes an undervoltage state, an overvoltage state, and a steady state, and a voltage state of an output channel of each drive unit is determined by the drive unit according to a voltage of the output channel within preset time and a steady operation voltage range; and adjusting, according to the voltage state of each output channel of the any number of drive units, voltages of power supply terminals of all light-emitting units in the back light unit. This solution can reduce power loss of the display device and ensure display of pictures.