Pixel Circuit Voltage Regulation for Mixed-Refresh Display Uniformity
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Solution Overview
Problem
Display panels experience defects such as screen flicker and uneven brightness due to different data refresh frequencies leading to varying light-emitting brightness in pixel circuits.
Innovation Solution
A display device with pixel circuits that include a driving transistor and a voltage regulating module, adjusting node voltages using different voltages from voltage regulating signal lines at varying refresh frequencies to stabilize the bias state of the driving transistor, thereby reducing brightness differences and flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pixel circuits perform data refreshing at different data refresh frequencies, then the display panel can support diverse driving modes and improve productivity, but the light-emitting elements produce different light-emitting brightness causing screen flicker and uneven display
Solution Approach 1:
The patent applies parameter changes by adjusting the node voltage of the driving transistor according to different data refresh frequencies. When the pixel circuit operates at a first data refresh frequency, the node voltage is set to a first voltage, and when it operates at a second data refresh frequency, the node voltage is adjusted to a second voltage. This dynamic parameter adjustment compensates for the brightness variations caused by different refresh frequencies, thereby maintaining stable light-emitting brightness while supporting diverse driving modes
Solution Approach 2:
The patent implements a feedback mechanism where the voltage regulating module continuously monitors the data refresh frequency and adjusts the node voltage accordingly. The voltage regulating signal line provides feedback control by modifying the voltage level based on the detected refresh frequency, ensuring that the driving transistor maintains optimal operating conditions across different driving modes, thus preventing screen flicker and uneven display
2Speed
If pixel circuits operate at higher data refresh frequencies, then the display responsiveness improves, but the power consumption increases due to higher driving current requirements
Solution Approach 1:
The patent utilizes parameter changes to optimize the voltage level of the driving transistor based on the data refresh frequency. At higher refresh frequencies, the node voltage is adjusted to appropriate levels that enable fast switching and high-speed operation. At lower refresh frequencies, the voltage is reduced to minimize power consumption. This dynamic parameter adjustment allows the display to achieve high responsiveness when needed while conserving energy during normal operation
Data Source
AI summary
A display device including a display panel having a display area. The display panel includes pixel circuits located in the display area. Each pixel circuit includes a driving transistor and a voltage regulating module that is configured to adjust a node voltage of the driving transistor by a voltage provided by one voltage regulating signal line of voltage regulating signal lines. The pixel circuits have data refresh frequencies including first and second frequencies. The first frequency is greater than the second frequency. When one pixel circuit performs data refreshing at the first frequency, one voltage regulating signal line is configured to provide a first voltage, and when one pixel circuit performs data refreshing at the second frequency, one voltage regulating signal line is configured to provide a second voltage not equal to the first voltage.