Display Driving Circuit for Accurate Local Refresh Timing
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Solution Overview
Problem
The issue of inaccurate local refresh in display panels arises due to the pulse width of the n-th stage driving signal exceeding 1H, causing the waveform to cross the changing edge of the enable signal, resulting in incomplete output of the driving signal and abnormal pixel operation.
Innovation Solution
A driving circuit design incorporating a driving signal generating circuit, control signal generating circuit, and control circuit, along with optional inverting circuits and energy storage circuits, to accurately control and invert signals, ensuring complete output of the n-th stage driving signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pulse width of the n-th stage driving signal is increased to accommodate diversified pixel control signals, then the driving signal can cover more pixel operation requirements, but the waveform will cross the changing edge of the enable signal, resulting in incomplete output and abnormal pixel operation
Solution Approach 1:
A control signal generating circuit is introduced as an intermediary between the enable signal and the control circuit. This circuit generates a control signal based on the enable signal and the n-th stage driving signal, which then controls the output timing. The intermediary control signal ensures that the driving signal is completely output even when its pulse width exceeds the enable signal duration, resolving the contradiction between extended pulse width and complete signal output.
Solution Approach 2:
The control signal generating circuit performs preliminary action by generating the control signal in advance based on the enable signal and the n-th stage driving signal. This preliminary control signal preparation allows the control circuit to properly时序 the output, ensuring complete driving signal transmission before the enable signal changes state, thus maintaining reliability despite extended pulse width.
2Device complexity
If the control circuit is directly controlled by the enable signal, then the circuit structure is simple, but when the driving signal pulse width exceeds 1H, only part of the driving signal can be output, causing abnormal pixel operation
Solution Approach 1:
The control signal generating circuit serves as an intermediary that translates the simple enable signal control into a more sophisticated control mechanism. It generates a control signal that incorporates both the enable signal timing and the n-th stage driving signal characteristics, allowing the control circuit to operate reliably without significantly increasing overall system complexity.
Solution Approach 2:
The control function is segmented into two parts: the enable signal generates the control signal through the control signal generating circuit, and this control signal then drives the control circuit. This segmentation allows the system to maintain simple external control while achieving complex internal timing control for reliable pixel operation.
Data Source
AI summary
A drive circuit, a display substrate and a display device. The drive circuit includes a driving signal generating circuit, a control signal generating circuit and a control circuit. The driving signal generating circuit is used to generate an n-th stage driving signal, n is a positive integer; the control signal generating circuit is used to generate a control signal according to an enable signal; the control circuit is used to output the n-th stage driving signal or invalid voltage signal to the n-th stage driving output terminal under control of the control signal. According to the present disclosure, the n-th stage driving signal or the invalid voltage signal can be accurately output to the n-th stage driving output terminal, thereby accurately performing local refresh.