Display Drive Circuit Duration Control for Brightness Range
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Solution Overview
Problem
The brightness adjustment range of electroluminescent diodes in display devices is limited due to manufacturing constraints, restricting the display of a wide range of gray scales.
Innovation Solution
A drive circuit comprising a current control circuit, a first transistor, and a duration control circuit, which generates a light-emitting duration modulating signal to control the conduction duration of the transistor, allowing independent adjustment of the drive signal input and duration, thereby expanding the brightness adjustment range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional drive circuits are used for electroluminescent diodes, then the device can operate with simple control, but the brightness adjustment range is limited due to manufacturing constraints
Solution Approach 1:
The patent applies PWM (Pulse Width Modulation) technology to dynamically control the conduction duration of the first transistor, transforming the static brightness control into a dynamic time-based control mechanism. The duration control circuit generates a light-emitting duration modulating signal that varies the conduction time of the first transistor, thereby dynamically adjusting the brightness of the electroluminescent diode without changing the drive signal amplitude, thus expanding the brightness adjustment range beyond manufacturing limitations.
Solution Approach 2:
The patent changes the control parameter from amplitude-based (traditional current control) to time-based (conduction duration control). By introducing a duration control signal terminal and generating a light-emitting duration modulating signal, the system modifies the temporal parameter of transistor conduction to achieve continuous brightness adjustment. This parameter transformation allows precise control of light output intensity by varying the duty cycle of the drive signal.
2Adaptability or versatility
If the brightness adjustment range is expanded, then more gray scales can be displayed, but the circuit structure becomes more complex
Solution Approach 1:
The first transistor serves multiple functions: it acts as both the drive transistor for current control and the switching element for duration control. The same transistor channel is utilized for both amplitude-based drive signal transmission and time-based conduction duration modulation, eliminating the need for separate switching transistors and reducing overall circuit complexity while maintaining brightness control flexibility.
Solution Approach 2:
The duration control circuit generates the light-emitting duration modulating signal in advance during the scanning phase, before the actual light emission phase. The signal is prepared and stored in the first transistor's gate during the scanning period, and then automatically executed during the light emission phase without requiring real-time control during the critical emission window, simplifying the control architecture.
Data Source
AI summary
Embodiments of the present disclosure disclose a drive circuit, a driving method thereof and a display device. The drive circuit includes: a current control circuit, configured to provide a drive signal to a device to be driven according to a signal of a data signal terminal; a first transistor, electrically connected between the current control circuit and the device to be driven; and a duration control circuit, electrically connected with a gate of the first transistor, and configured to provide a light-emitting duration modulating signal to the gate of the first transistor according to a combined action of signals of a scanning signal terminal, a light-emitting control signal terminal, a duration control signal terminal and a reference voltage signal terminal, to control a conduction duration of the first transistor.