Electro-Optic Device Driving Method for 3D Display Compensation
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Solution Overview
Problem
High-speed driving of pixel circuits in electro-optic devices, such as LCDs and OLEDs, faces challenges in obtaining sufficient threshold voltage compensation time and data writing time, leading to display quality deterioration, especially during short scan line selection periods for 3-D image display.
Innovation Solution
A driving method that includes a first power source, a second power source, data lines, scan lines, signal lines, and pixel circuits with specific transistors and capacitors, where the light emitting element is in a non-light-emitting state, and transistors are controlled to allow threshold voltage compensation and data writing, reducing the number of elements while maintaining quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-speed driving is performed to increase productivity, then the output per unit time is improved, but the threshold voltage compensation time and data writing time become insufficient
Solution Approach 1:
The patent applies preliminary action by performing threshold voltage compensation during the period when the light emitting element is not emitting light (non-display period). The compensation transistor is activated beforehand to adjust the threshold voltage of the driving transistor before the actual display period begins, ensuring that compensation occurs in advance rather than during the critical data writing or light emission periods.
Solution Approach 2:
The patent implements periodic action by dividing the operating cycle into distinct periods: a light-emitting period (display period) and a non-light-emitting period (compensation period). During the non-light-emitting period, the compensation transistor is activated to perform threshold voltage compensation, while during the light-emitting period, the pixel circuit performs normal display functions. This periodic switching allows both compensation and high-speed driving to coexist without interfering with each other.
2Productivity
If the scan line selection period is shortened to increase driving speed, then productivity is improved, but the data writing time becomes insufficient
Solution Approach 1:
The patent applies preliminary action by preparing the pixel circuit state during the non-light-emitting period before the scan line selection begins. The compensation transistor adjusts the driving transistor threshold voltage in advance, and the pixel circuit is reset to a known state, so that when the shortened scan line selection period begins, data writing can proceed immediately without requiring additional preparation time.
Solution Approach 2:
The patent maintains continuity of useful action by ensuring that the pixel circuit remains in a ready state throughout the cycle. During the non-light-emitting period, the compensation and reset operations prepare the circuit continuously, so that when the scan line selection period arrives (even if shortened), the data writing can proceed without interruption or delay, maximizing the utilization of the available time window.
3Adaptability or versatility
If surface sequential driving is performed for 3-D image display with short scan line selection period, then adaptability is improved, but the threshold voltage compensation time becomes insufficient
Solution Approach 1:
The patent implements periodic action by synchronizing the compensation operation with the display mode. For 3-D surface sequential driving, the system alternates between left-eye and right-eye display periods. During the non-display period between these sequences, the compensation transistor is activated to perform threshold voltage compensation. This periodic structure allows the system to maintain 3-D display capability while ensuring adequate compensation time is allocated in the gaps between display sequences.
Solution Approach 2:
The patent applies preliminary action by performing threshold voltage compensation in advance during the non-display period before the next 3-D display sequence begins. This ensures that the driving transistor is properly compensated before the high-speed surface sequential driving starts, preventing display quality deterioration even when the scan line selection period is shortened for 3-D operation.
Data Source
AI summary
A driving method of an electro-optic device is capable of sufficiently providing a threshold voltage compensation time of a driving transistor and a data writing time. A driving method of an electro-optic device including a first power source, a second power source, data lines, scan lines, signal lines, and pixel circuits, includes: a first step in which a light emitting element is in a non-light-emitting state, and a second transistor is turned on by a change of a pulse applied to a signal line; and a second step in which the scan line is sequentially and exclusively selected after the second transistor is turned on, a third transistor including a gate connected to a selected scan line is turned on, and a corresponding data voltage is written to a first node from the data line through the third transistor.