Pixel Circuit Voltage Regulation for Mixed Refresh Display Flicker
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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 productivity is improved, but illumination intensity becomes uneven leading to 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, a first node voltage is applied, and when it operates at a second data refresh frequency, a second node voltage is applied. This dynamic parameter adjustment compensates for the brightness variations caused by different refresh frequencies, thereby resolving the contradiction between improved productivity and maintained illumination uniformity.
2Productivity
If data refresh frequency is increased, then productivity is improved, but light-emitting brightness changes causing screen flicker
Solution Approach 1:
The patent dynamically changes the node voltage parameter of the driving transistor based on the data refresh frequency. When switching between different refresh frequencies, the corresponding node voltage is adjusted to maintain consistent light-emitting characteristics. This ensures display stability and eliminates screen flicker while allowing high refresh frequencies for improved productivity.
3Illumination intensity
If different voltages are applied to adjust brightness, then illumination intensity is improved, but device complexity increases
Solution Approach 1:
The voltage regulating module is designed to perform multiple functions: it not only regulates the node voltage to compensate for brightness variations but also adapts to different data refresh frequencies. This multi-functional design allows a single module to handle both brightness compensation and frequency adaptation, reducing the need for additional separate components and thereby limiting the increase in device complexity.
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.