Variable-Frequency Display Driving With Emission Pulse-Width Control
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Solution Overview
Problem
Existing display devices struggle to operate efficiently at various driving frequencies, impacting image quality and performance.
Innovation Solution
A display device and driving method that includes a light-emitting device, transistors, and a driving controller capable of adjusting the pulse width of the emission control signal based on different frequency modes, allowing operation at multiple frequencies by incorporating active and blank periods with varying pulse widths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a display device operates at a fixed high driving frequency, then image quality is improved, but power consumption increases
Solution Approach 1:
The display device dynamically adjusts the pulse width of the emission control signal based on the driving frequency. At lower driving frequencies, the pulse width is increased to maintain adequate light emission duration, while at higher frequencies, the pulse width is reduced. This dynamic adaptation allows the device to operate efficiently across various frequencies without excessive power consumption.
Solution Approach 2:
The invention changes the pulse width parameter of the emission control signal according to the driving frequency. By adjusting this temporal parameter, the system optimizes the balance between image quality and power consumption at different operating frequencies, preventing excessive power drain at high frequencies while ensuring sufficient light output.
2Duration of action of moving object
If the pulse width of the emission control signal is increased, then light emission duration is improved, but power consumption increases
Solution Approach 1:
The pulse width is dynamically adjusted based on the driving frequency rather than being fixed. At lower driving frequencies where more time is available between frames, the pulse width is increased to extend light emission duration. At higher frequencies where time is constrained, the pulse width is reduced accordingly, optimizing the balance between emission duration and power consumption for each operating condition.
3Adaptability or versatility
If the display device operates at variable driving frequencies, then adaptability is improved, but device complexity increases
Solution Approach 1:
The invention achieves variable frequency operation by adjusting a single critical parameter - the pulse width of the emission control signal - based on the driving frequency. This parameter-based control approach enables frequency adaptability without requiring complex control circuits, as the system simply modifies the temporal characteristics of an existing control signal rather than introducing additional control mechanisms.
Data Source
AI summary
A display device includes a light-emitting device, a first transistor, and a second transistor connected between the first transistor and the light-emitting device and including a gate electrode which receives the emission control signal. When a driving frequency is a second frequency less than a first frequency, one frame includes an active period and a blank period, and during the active period, a pulse width of the emission control signal has a first value, and during the blank period, the pulse width of the emission control signal has a second value different from the first value.