AMOLED Drive Circuit Voltage-to-Current Conversion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing drive circuits for Active-Matrix Organic Light Emitting Diode (AMOLED) displays have low output accuracy, high power consumption, and poor uniformity, particularly as the differences between data voltages for neighboring grey scales become smaller, necessitating improved performance.
Innovation Solution
A drive circuit with a conversion unit comprising transistors and capacitors that converts voltage signals into current signals for pixel circuits, reducing power consumption and enhancing output accuracy and image uniformity, and a drive method that adjusts signal levels to optimize the operation of the drive circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a data voltage is output directly by a drive circuit to control luminance of pixels, then the drive circuit structure is simple, but the output accuracy is low
Solution Approach 1:
The patent introduces a conversion unit as an intermediary component between the drive circuit and pixel circuit. This conversion unit includes a first transistor, second transistor, third transistor, and first capacitor that work together to convert voltage signals into current signals, thereby improving output accuracy without significantly complicating the overall drive circuit structure.
Solution Approach 2:
The patent changes the output parameter of the drive circuit from voltage to current by introducing the conversion unit. The conversion unit transforms the voltage signal from the source drive unit into a current signal that is more suitable for controlling pixel luminance, thereby improving output accuracy through parameter transformation.
2Measurement precision
If the resolution of display panels is improved, then the display quality is enhanced, but the requirements of output accuracy of drive circuit become increasingly higher
Solution Approach 1:
The patent transforms the output parameter from voltage to current, which provides better differentiation capability for adjacent gray scale voltages. The current signal output by the conversion unit can more effectively distinguish between small voltage differences corresponding to neighboring gray levels, thereby meeting the higher output accuracy requirements for high-resolution displays.
Solution Approach 2:
The patent replaces the direct voltage output mechanism with a voltage-to-current conversion mechanism. This substitution allows the drive circuit to achieve finer control over pixel luminance by utilizing current signals, which have better differentiation characteristics for small voltage changes associated with high-resolution gray scales.
3Use of energy by stationary object
If the drive circuit outputs voltage signals directly, then the circuit design is simple, but the power consumption is high
Solution Approach 1:
The conversion unit acts as an intermediary that efficiently converts voltage signals to current signals. This conversion process is designed to minimize power loss while improving the driving capability for pixel circuits, thereby reducing overall power consumption without adding excessive complexity to the drive circuit.
Solution Approach 2:
By changing the output parameter from voltage to current, the drive circuit achieves more efficient power utilization. The current signal output by the conversion unit can drive pixel circuits more effectively, reducing the need for high voltage swings and thereby lowering power consumption.
4Stability of the object's composition
If the drive circuit uses conventional voltage output method, then the implementation is straightforward, but the image uniformity is poor
Solution Approach 1:
The conversion unit serves as an intermediary that transforms voltage signals into current signals, which provides better uniformity in image display. The current signal output by the conversion unit compensates for variations in pixel characteristics, thereby improving overall image uniformity without significantly increasing circuit complexity.
Solution Approach 2:
The patent changes the output parameter from voltage to current, which improves image uniformity. The current signal has better characteristics for driving pixel circuits, reducing variations in luminance across different pixels and thereby achieving more uniform image display.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves high output accuracy, low power consumption, and improved image uniformity and dynamic range for AMOLED displays by converting voltage signals into current signals, effectively addressing the limitations of prior art.
Implementation Method 1
The conversion unit may comprise a first transistor, a second transistor, a third transistor, and a first capacitor
Implementation Method 2
the first capacitor is connected in parallel between the gate and the first electrode of the second transistor
Data Source
AI summary
Embodiments of the present disclosure provide a drive circuit and a drive method thereof, a display substrate and a drive method thereof, and a display device. The drive circuit comprises a conversion unit provided with a first input terminal, a second input terminal, a third input terminal, a fourth input terminal, and an output terminal, wherein the fourth input terminal is connected to a direct current power source, and wherein the output terminal is connected to a pixel circuit. The first input terminal is configured to input a voltage signal, the second input terminal is configured to input a first drive signal, the third input terminal is configured to input a second drive signal, and the output terminal is configured to output a current signal. The conversion unit converts the voltage signal output from the source drive unit into the current signal and the pixel circuit is driven by the current signal.