Display Drive Circuit for Decoupled Gate Voltage and Brightness
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Solution Overview
Problem
Existing drive circuits in semiconductor devices experience increased power consumption due to coupling of control electrode voltages, leading to decreased brightness of light-emitting diodes.
Innovation Solution
A drive circuit design incorporating specific transistor configurations and a storage capacitor to isolate control electrode voltages, reducing the forward gamma voltage and enhancing brightness while minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If control electrode voltage of switching transistor couples control electrode voltage of drive transistor, then circuit structure is simplified, but brightness of light-emitting diode decreases and power consumption increases
Solution Approach 1:
The patent segments the control electrode voltage control into two independent parts: the drive transistor's control electrode voltage is controlled independently from the switching transistor's control electrode voltage. This is achieved by providing separate control circuits for each transistor, allowing the drive transistor's gate voltage to be adjusted without being coupled to the switching transistor's gate voltage changes, thereby resolving the contradiction between circuit simplicity and display brightness.
2Device complexity
If control electrode voltage of switching transistor couples control electrode voltage of drive transistor, then circuit structure is simplified, but power consumption of drive circuit increases
Solution Approach 1:
The patent segments the power consumption control by providing independent control circuits for the drive transistor and switching transistor. The drive transistor's control electrode voltage is adjusted separately based on threshold voltage compensation, allowing the circuit to operate at optimal power levels without the unnecessary power consumption caused by coupled voltage changes from the switching transistor.
3Illumination intensity
If control electrode voltage of drive transistor is adjusted to enhance brightness, then brightness of light-emitting diode increases, but threshold voltage variation of drive transistor increases
Solution Approach 1:
The patent implements a threshold voltage compensation circuit that provides feedback control for the drive transistor's control electrode voltage. The compensation circuit detects the threshold voltage of the drive transistor and adjusts its control electrode voltage accordingly, ensuring that brightness is enhanced while threshold voltage stability is maintained through continuous feedback adjustment.
Solution Approach 2:
The patent changes the control parameter for the drive transistor from being coupled to the switching transistor's voltage to being controlled by a separate compensation circuit that directly adjusts the drive transistor's gate voltage based on its threshold voltage characteristics, allowing independent optimization of brightness and threshold voltage stability.
Data Source
AI summary
A drive circuit and a display device are provided. Changes in control electrode voltages of switching transistors do not couple a control electrode voltage of a drive transistor. The drive circuit may support different levels of image refresh frequencies at the same time, and implement seamless switching between different image refresh frequencies. The drive circuit may include a storage capacitor, the drive transistor, and the switching transistors. The drive transistor may be configured to control a drive current of the light-emitting diode, and the switching transistors may control the control electrode voltage of the drive transistor and compensate for a threshold voltage of the drive transistor. Other embodiments are described herein.