Display Device Row Voltage Control for Luminance and Blur
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Solution Overview
Problem
Current display devices using current-driven light emitting units face challenges in reducing image blurs and enhancing luminance without increasing the drive voltage, which leads to higher power consumption.
Innovation Solution
A display device and method that includes a control unit detecting maximum grayscale values of input signals and adjusting duty ratios of the drive voltage and video signal values for each row of display elements, allowing for reduced blurs and increased luminance without raising the drive voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the drive voltage is increased to enhance luminance, then the luminance of the display device is improved, but the power consumption increases
Solution Approach 1:
The patent applies dynamics by making the drive voltage adjustable and time-variable. The control unit dynamically adjusts the drive voltage based on the required luminance output, transitioning between different voltage levels (e.g., first drive voltage and second drive voltage) rather than using a fixed high voltage. This allows the system to optimize between luminance and power consumption in real-time.
Solution Approach 2:
The patent changes the parameter of drive voltage from a static value to a variable parameter that can take multiple values. By introducing a control unit that adjusts the drive voltage based on luminance requirements, the system can use lower voltages when high luminance is not needed, thereby reducing power consumption while maintaining the ability to achieve high luminance when necessary.
2Stability of the object's composition
If a small duty ratio is used to reduce blurs of moving images, then image quality is improved, but the light emitting period is shortened and luminance is reduced
Solution Approach 1:
The patent applies dynamics by making the drive voltage time-variable and adjusting it based on the duty ratio requirements. When a small duty ratio is used to reduce blurs, the control unit adjusts the drive voltage accordingly to maintain adequate luminance. The system dynamically adapts the voltage level to the temporal characteristics of the display operation.
Solution Approach 2:
The patent utilizes periodic action through the use of drive circuits that operate in cycles with controlled duty ratios. The control unit manages the periodic switching of the drive voltage to achieve the desired balance between reducing blurs (small duty ratio) and maintaining luminance. The system exploits the periodic nature of display operation to optimize both image quality and luminance.
Data Source
AI summary
A display device includes a display unit having display elements arrayed in rows and columns. The display elements each include a current-driven light emitting unit and a drive circuit for driving the light emitting unit. A power supply unit supplies a drive voltage for driving the display elements to power supply lines corresponding to the rows of display elements. A signal output unit supplies video signal voltages to data lines corresponding to the columns of the display elements. A control unit detects maximum grayscale values of input signals corresponding to the display elements arranged in the rows, and accordingly controls duty ratios of the drive voltage supplied to the power supply lines corresponding to the rows of the display elements. The control unit also controls values of video signals corresponding to the display elements in each row.