Pixel Array Driver With PWM Shift Control for Brightness Modulation
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Solution Overview
Problem
Existing gate driver on array (GOA) devices in flat-panel displays lack flexibility in adjusting the waveform and width of output signals, limiting the ability to modulate pixel emission duration and brightness.
Innovation Solution
A driving device with pulse width modulation and shift control circuits that modulate the output pulse width using shift pulse signals aligned to clock signals, allowing independent adjustment of pixel emission duration and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing GOA circuit uses fixed clock signals to control output signals, then the circuit structure is simple, but the output signal width cannot be modulated and is limited to integer multiples of clock period
Solution Approach 1:
The output signal width control is segmented into multiple selectable ranges (first range and second range), allowing independent control in each range. This segmentation enables flexible modulation of output signal width while maintaining a relatively simple circuit structure by using separate control paths for different ranges.
Solution Approach 2:
The invention introduces dynamic control mechanisms including a first selection circuit and a second selection circuit that can dynamically switch between different clock signals (first clock signal and second clock signal) based on control signals. This dynamic switching capability allows the output signal width to be modulated beyond fixed integer multiples of clock period.
2Adaptability or versatility
If existing GOA circuit requires output signal waveform to fully align with clock signal waveform, then the clock signal control is simple, but the flexibility in adjusting emission duration and brightness is lost
Solution Approach 1:
The invention enables dynamic adjustment of output signal width independently from clock signal alignment by using selection circuits that can choose different clock signals for different control periods. This allows the emission duration and brightness to be adjusted flexibly without requiring full waveform alignment with the clock signal.
Solution Approach 2:
The control signal is designed to预先 (in advance) select which clock signal will be used for generating the output signal in each control period. This preliminary selection allows the system to prepare the appropriate clock signal before generating the output signal, enabling flexible emission duration control while maintaining simple operation.
3Adaptability or versatility
If existing GOA circuit uses fixed output signal width, then the circuit operation is stable, but the pixel brightness control flexibility is limited
Solution Approach 1:
The output signal width control is divided into segmented ranges with different clock signals, where each range can be independently controlled. This segmentation allows flexible pixel brightness control by selecting appropriate ranges while maintaining circuit stability through structured control paths for each segment.
Solution Approach 2:
The invention uses control signals that provide feedback mechanisms to select appropriate clock signals and control the output signal width dynamically. This feedback-based selection ensures stable circuit operation while enabling flexible brightness control through programmable selection of control parameters.
Data Source
AI summary
A driving device is used to control pixels of a pixel array. The driving device includes driving circuits. Each driving circuit includes a pulse width modulation circuit, which is used to provide an output pulse signal to at least one of the pixels of the pixel array, and a shift control circuit, which is used to provide a shift pulse signal to the pulse width modulation circuit and the shift control circuit of a next stage. The output pulse signal has an output pulse width. The shift pulse signal has a shift pulse width, which is substantially equal to a first period of a first clock signal or a second period of a second clock signal. The first period is equal to the second period. The pulse width modulation circuit modulates the output pulse width in response to the shift pulse signal, a data signal and a sweep signal.