Dynamic Power Supply Circuit for Display Device Gray Scale Control
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Solution Overview
Problem
Existing display devices, particularly electroluminescence display (ELD) devices, face issues with deteriorated image quality at low gray scales due to mismatched driving currents, and there is a need to reduce power consumption to address environmental and resource depletion challenges.
Innovation Solution
A power supply circuit and display device configuration that includes a first power supply circuit for providing a first initialization voltage with varying voltage levels and a second power supply circuit for supplying a pixel driving voltage, which helps in initializing the pixels effectively and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a high voltage is applied to the pixel to increase driving current, then the light emission intensity is improved, but the image quality deteriorates at low gray scales due to current mismatch
Solution Approach 1:
The power supply circuit dynamically adjusts the pixel driving voltage based on the gray scale level. For low gray scales, it applies a first pixel driving voltage that prevents excessive current flow, while for high gray scales, it applies a second pixel driving voltage to ensure sufficient light emission. This dynamic adjustment resolves the contradiction by adapting the voltage level to the specific operating conditions.
Solution Approach 2:
The invention changes the voltage parameter of the pixel driving signal based on the gray scale level. By switching between different voltage levels (first pixel driving voltage for low gray scales, second pixel driving voltage for high gray scales), the system optimizes both image quality and light emission intensity for different operating conditions.
2Reliability
If continuous power is supplied to maintain pixel operation, then the display function is maintained, but power consumption increases
Solution Approach 1:
The power supply circuit operates in periodic cycles, alternating between a power consumption reduction period and a normal operation period. During the reduction period, it supplies a reduced power level to maintain basic display functionality, and during the normal period, it restores full power for optimal performance. This periodic operation reduces average power consumption while maintaining display reliability.
Solution Approach 2:
The circuit performs preliminary initialization of pixels using a specific initialization voltage before normal operation begins. This preliminary action ensures that pixels are properly prepared and charged, allowing the display to maintain reliability during subsequent power reduction periods without requiring continuous full-power supply.
Data Source
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AI summary
The present disclosure relates to a power supply device including a gate driving circuit configured to supply gate signals to a plurality of gate lines, a first power supply circuit configured to supply a first initialization voltage having a voltage level between a first voltage level and a second voltage level to a plurality of first initialization power lines, the first initialization voltage having the first voltage level in a first period, a third voltage level between the first and second voltage levels in a second period, and the second voltage level in a third period, and a second power supply circuit configured to supply a driving voltage to a plurality of driving power lines among the plurality of power lines, and a display device including the power supply device.