Display Panel Phase Adjustment for Low-Gray-Scale Flicker
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Solution Overview
Problem
The brightness difference between phases in OLED display panels during low-gray-scale and low-frequency display states affects the display effect, leading to issues like flickering.
Innovation Solution
A display panel design with a first phase including data writing and light-emitting phases, and a second phase with adjusting and light-emitting phases, where an adjusting voltage is transmitted to correct the bias state of driving transistors, minimizing brightness differences between phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the display panel operates in low-gray-scale and low-frequency display state, then power consumption is reduced, but brightness difference between phases becomes obvious causing flickering
Solution Approach 1:
The patent applies preliminary action by introducing an adjusting phase before the light-emitting phase in the second frame period. During this adjusting phase, the data voltage writing module is turned on again to write adjusting voltage to the pixel circuit, which compensates for the bias state of the driving transistor before the actual light-emitting phase begins. This preliminary adjustment ensures that even in low-gray-scale and low-frequency display states, the brightness remains stable and eliminates flickering while maintaining low power consumption.
2Reliability
If the data voltage writing module remains on during adjusting phase, then brightness stability is improved, but power consumption increases
Solution Approach 1:
The patent applies periodic action by turning on the data voltage writing module periodically - specifically during the data writing phase of the first frame period and during the adjusting phase of the second frame period. Between these periodic activations, the module remains off to conserve power. This periodic operation allows the system to maintain brightness stability when needed while minimizing power consumption during normal operation.
Solution Approach 2:
The patent applies local quality by selectively activating the data voltage writing module only in specific phases (data writing phase and adjusting phase) rather than keeping it continuously on. This localized activation ensures that power is consumed only when necessary for voltage adjustment, thereby maintaining brightness stability during critical phases while reducing overall power consumption.
3Reliability
If the adjusting phase is added to the second frame period, then brightness difference between phases is reduced, but display complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the display operation into distinct phases: the first frame period contains a data writing phase and a light-emitting phase, while the second frame period contains an adjusting phase followed by a light-emitting phase. This segmentation allows the system to perform brightness adjustment in a dedicated phase without interfering with the normal display operation, thereby reducing brightness differences while maintaining manageable complexity through clear phase separation.
Data Source
AI summary
A display panel, a method for driving the same, and a display apparatus are provided. The display panel includes data signal lines and pixel circuits. The pixel circuit includes a driving module and a data voltage writing module. The data voltage writing module is connected between the data signal line and the input terminal of the driving module. The display panel has first and second phases when displaying one frame of an image. The first phase includes a data writing phase and a light-emitting phase. The second phase includes an adjusting phase and a light-emitting phase. During the data writing phase, the data voltage writing module is turned on, and the data signal line transmits the data voltage. During the adjusting phase, the data voltage writing module is turned on, and the data signal line transmits the adjusting voltage corresponding to the data voltage transmitted during the data writing phase.