Variable Initialization Voltage for Display Luminance
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Solution Overview
Problem
When the voltage of the main power supply is reduced to reduce power consumption in display devices, the amplitude of the video signal written into pixels may not be sufficiently secured, limiting the maximum luminance.
Innovation Solution
A display device with a pixel array unit and a signal output unit that varies the initialization voltage of the driving transistor based on the signal voltage of the video signal for each pixel, allowing for higher luminance even with low amplitude video signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the voltage of the main power supply is reduced to reduce power consumption, then power consumption is reduced, but the amplitude of the video signal is insufficient and maximum luminance is limited
Solution Approach 1:
The invention changes the parameter of initialization voltage from a fixed value to a variable value that depends on the signal voltage. By dynamically adjusting the initialization voltage based on the signal voltage amplitude, the system compensates for the reduced video signal amplitude caused by lower power supply voltage, thereby maintaining sufficient maximum luminance while operating at reduced power consumption levels
Solution Approach 2:
The signal output unit uses feedback from the signal voltage to adjust the initialization voltage. The initialization voltage is determined based on the amplitude of the video signal, creating a closed-loop control system that automatically compensates for signal amplitude limitations when operating at reduced power supply voltage
2Use of energy by stationary object
If the voltage of the main power supply is reduced to reduce power consumption, then power consumption is reduced, but the amplitude of the video signal to be written into a pixel cannot be sufficiently secured
Solution Approach 1:
The invention changes the parameter of initialization voltage from fixed to variable, where it is adjusted according to the signal voltage amplitude. This parameter change ensures that even when the power supply voltage is reduced and video signal amplitude is limited, the initialization voltage can be optimized to maintain sufficient signal amplitude for reliable pixel writing
Solution Approach 2:
The initialization voltage is applied before the video signal is written to the pixel. By preliminarily setting the gate voltage of the driving transistor through initialization, the system prepares the pixel circuit to properly receive and process the video signal, ensuring sufficient effective amplitude even when the overall signal amplitude is reduced due to lower power supply voltage
Data Source
AI summary
Provided is a display device that includes a pixel array unit in which pixels are two-dimensionally arranged in a matrix shape, each of the pixels including a light emitting element, and a signal output unit that outputs, to each of the pixels of the pixel array unit, a signal voltage of a video signal and an initialization voltage for initializing a gate voltage of a driving transistor. The signal output unit varies the initialization voltage depending on the signal voltage of the video signal for each of the pixels to which the signal voltage of the video signal is written.