Display Panel Voltage Reset for Low-Frequency Flickering
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Solution Overview
Problem
Display panels driven at low frequencies experience picture flickering and undesirable phenomena due to differences in bias voltages and driving currents during low-frequency, low-grayscale operations, leading to smearing and noticeable brightness fluctuations.
Innovation Solution
A display panel design with a voltage writing module and threshold compensation module that resets the second node at a high frequency during the holding phase, reducing voltage differences and maintaining consistent bias voltages across the drive transistor, thereby alleviating flickering and smearing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the display panel is driven at a low frequency to save power, then power consumption is reduced, but picture flickering and brightness fluctuations occur
Solution Approach 1:
The patent implements periodic voltage writing to the second node during holding phases at frequencies of 30Hz, 60Hz, or 120Hz, which are higher than the low driving frequency (5Hz, 10Hz, or 15Hz). This periodic action maintains consistent bias voltages and prevents flickering while the display operates at low power consumption frequencies
Solution Approach 2:
The patent performs preliminary voltage writing to the second node before light emission periods during holding phases. By pre-establishing consistent bias voltages through periodic writing operations, the system prevents brightness fluctuations and flickering before they occur, ensuring display stability during low-frequency operation
2Use of energy by stationary object
If the display panel is driven at a low frequency, then power consumption is reduced, but smearing and brightness fluctuations occur
Solution Approach 1:
The patent employs periodic voltage writing operations during holding phases at frequencies (30Hz, 60Hz, or 120Hz) higher than the low driving frequency. This periodic maintenance of bias voltages prevents smearing and brightness fluctuations, maintaining high display quality while operating at low power consumption frequencies
Solution Approach 2:
The patent changes the frequency parameter of voltage writing operations to be higher than the driving frequency during holding phases. By adjusting this parameter, the system maintains consistent bias voltages that prevent smearing and brightness fluctuations, ensuring high display quality at low driving frequencies
3Use of energy by stationary object
If the second node is not reset frequently during holding phase, then power consumption is reduced, but voltage differences cause flickering
Solution Approach 1:
The patent implements periodic voltage writing to the second node during holding phases at frequencies of 30Hz, 60Hz, or 120Hz. This periodic action maintains consistent bias voltages across different periods, preventing flickering while keeping the display operating at low power consumption frequencies
Solution Approach 2:
The patent uses the first scanning signal to control voltage writing operations during holding phases. By monitoring the state of the second node and periodically rewriting the voltage based on scanning signal timing, the system maintains feedback control over bias voltage consistency, preventing flickering during low-frequency operation
Data Source
AI summary
The present disclosure provides a display panel, a driving method, and a display apparatus. The display panel includes pixel circuits, the pixel circuits include: a drive transistor, with a gate electrically connected to a first node, a first electrode electrically connected to a second node; a voltage writing module, electrically connected to a first scanning signal line, a data line, and second node; a threshold compensation module, wherein a driving cycle of the pixel circuit includes a writing phase and a holding phase, writing phase includes a first non-light-emission period, and holding phase includes a second non-light-emission period; voltage writing module writes a display voltage into second node in first non-light-emission period in response to an enable level of first scanning signal, writes a node reset voltage into the second node in the second non-light-emission period in response to the enable level of the first scanning signal.