Display Panel Voltage Control for Black Ring Elimination
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Solution Overview
Problem
Display panels in low-frequency driving mode are prone to exhibit black rings when operated in high-temperature environments due to the data writing module being easily turned on, leading to unwanted voltage coupling and display issues.
Innovation Solution
Implementing a voltage control module that maintains the data signal line at a lower voltage value (V1) during holding frames following the data writing frame, where V1 is less than the preset data voltage value (V2), to prevent the data writing transistor from turning on unnecessarily and reduce voltage coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the display panel operates in low-frequency driving mode in high-temperature environment, then power consumption is reduced, but black rings appear due to data writing module being easily turned on
Solution Approach 1:
The patent applies preliminary action by controlling the data signal line voltage to V1 (lower than normal data voltage V2) during holding frames before the actual data writing frame. This preliminary voltage adjustment prevents the data writing transistor from being accidentally turned on during holding frames in high-temperature environments, eliminating black rings while maintaining low-frequency driving mode power savings.
2Manufacturing precision
If the data writing module is kept active to ensure data writing accuracy, then display precision is improved, but power consumption increases and black rings appear
Solution Approach 1:
The patent implements periodic action by alternating between two voltage states for the data signal line: V1 (lower voltage) during holding frames and V2 (normal data voltage) during data writing frames. This periodic voltage adjustment ensures the data writing transistor remains reliably off during holding frames (saving power) while being properly activated during data writing frames (maintaining accuracy).
Solution Approach 2:
The patent changes the voltage parameter of the data signal line dynamically based on the frame type. By adjusting the voltage from V2 to V1 during holding frames and back to V2 during data writing frames, the patent prevents unwanted transistor activation while maintaining proper data writing function, thus reducing power consumption without sacrificing accuracy.
3Reliability
If voltage control is applied to prevent black rings, then display quality is improved, but device complexity increases
Solution Approach 1:
The patent makes the data signal line serve multiple functions: it carries normal data signals during data writing frames and simultaneously acts as a voltage control line during holding frames by maintaining V1 level. This multi-functionality eliminates the need for separate control circuits, preventing black rings without increasing device complexity.
Data Source
AI summary
The embodiments of present application discloses a display panel and a display apparatus. The display panel includes a pixel circuit including a driving transistor and a data writing module; a data signal line connected to the data writing module and used to provide a data signal to the pixel circuit; and a voltage control module connected to the data signal line; wherein a low-frequency data refresh cycle includes a number of data frames including a data writing frame and n holding frames; in the data writing frame, the data signal line writes the data signal into the driving transistor; in the holding frames, the data signal line does not write the data signal; in first m holding frames, the voltage control module controls the data signal line to be maintained at a first voltage value V1, V1<V2, V2 is a preset data voltage value, and n≥m≥1.