Display Panel Initialization Signal Adjustment for Brightness Consistency
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Solution Overview
Problem
Display devices experience noticeable changes in brightness when switching between different drive frequencies, leading to inconsistent display performance and user experience.
Innovation Solution
A display panel with a pixel circuit comprising a drive transistor and an initialization transistor, along with an initialization signal line, is designed to operate in multiple drive modes with distinct frequencies and initialization signals, ensuring that the differences in display brightness across frequencies are minimized.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display device switches between different drive frequencies to satisfy different display requirements, then the adaptability of the display device is improved, but the display brightness consistency deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the initialization signal voltage level according to the drive frequency. When switching between different drive frequencies (e.g., from 60Hz to 120Hz), the initialization signal parameter is modified to compensate for brightness variations, ensuring consistent display brightness across different operating conditions.
Solution Approach 2:
The patent implements dynamics by making the initialization signal adaptive rather than static. The initialization signal is dynamically adjusted based on the current drive frequency, allowing the pixel circuit to adapt its initialization characteristics to match the operating conditions, thereby maintaining brightness consistency across frequency transitions.
2Device complexity
If a fixed initialization signal is used across different drive frequencies, then the device complexity is reduced, but the display brightness consistency deteriorates
Solution Approach 1:
Instead of using a fixed initialization signal, the patent changes the initialization signal parameter (voltage level) based on the drive frequency. This parameter adjustment approach maintains brightness consistency without requiring complex hardware modifications, achieving a balance between simplicity and performance.
3Illumination intensity
If the initialization signal is adjusted to compensate for brightness differences at different frequencies, then the display brightness consistency is improved, but the device complexity increases
Solution Approach 1:
The patent implements brightness compensation through parameter changes in the initialization signal rather than through complex hardware adjustments. By modifying the voltage level of an existing signal line based on frequency detection, the system achieves brightness consistency with minimal additional complexity.
Data Source
AI summary
A pixel circuit in a display panel includes a drive transistor and a first transistor, a first terminal of the drive transistor is electrically connected to a power signal line, a first terminal of the first transistor is electrically connected to an initialization signal line; a second terminal of the first transistor is electrically connected to the drive transistor, or the second terminal of the first transistor is electrically connected to the light-emitting element; and drive modes of the display panel include a first drive mode, a second drive mode, and a third drive mode, the first drive mode corresponds to a first drive frequency F1 and a first initialization signal Vref1, the second drive mode corresponds to a second drive frequency F2 and a second initialization signal Vref2, and the third drive mode corresponds to a third drive frequency F3 and a third initialization signal Vref3.