Display Device Gate Driving Unit Signal Integration
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Solution Overview
Problem
Display devices with variable refresh rate (VRR) modes face challenges in simplifying the pixel circuit and gate driving unit, leading to increased power consumption and larger bezel sizes.
Innovation Solution
The integration of gate signals during low-frequency driving in the VRR mode simplifies the pixel circuit by combining scan and emission control signals, reducing the complexity of the gate driving unit to a single scan and emission control signal driving unit, which enables a narrower bezel and lower power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If gate signals are integrated during low-frequency driving in VRR mode, then device complexity is reduced and bezel width is narrowed, but power consumption increases
Solution Approach 1:
The patent implements dynamic signal integration where the pixel circuit operates in two modes: during low-frequency driving, scan signals and emission control signals are integrated into a single gate signal to reduce complexity; during high-frequency driving, separate gate signals are used to maintain performance. This dynamic adaptation resolves the contradiction by adjusting the signal structure based on operating conditions.
Solution Approach 2:
The patent changes the refresh rate parameter to determine when to apply signal integration. By monitoring the refresh rate, the system switches between integrated gate signals (at low refresh rates) and separate gate signals (at high refresh rates), thereby optimizing the balance between device complexity and power consumption across different operating conditions.
2Device complexity
If gate signals are integrated during low-frequency driving in VRR mode, then device complexity is reduced and bezel width is narrowed, but power consumption increases
Solution Approach 1:
The patent merges the scan signal and emission control signal into a single integrated gate signal during low-frequency driving. This combining of multiple control signals into one reduces the complexity of the gate driving unit and allows for a narrower bezel, while the integration is specifically applied during low-power operating conditions to minimize the impact on overall power consumption.
3Use of energy by moving object
If separate gate signals are used for each transistor, then power consumption is reduced, but device complexity increases and bezel width increases
Solution Approach 1:
The patent implements a dynamic gate driving approach where the signal structure adapts to the operating conditions. During high-frequency driving, separate gate signals are used to minimize power consumption; during low-frequency driving, integrated gate signals are used to reduce device complexity and bezel width. This dynamic switching resolves the contradiction between power consumption and device complexity.
Data Source
AI summary
The disclosure relates to display devices. A display device comprises a display panel including a display area and a non-display area formed outside the display area and having a plurality of pixels and a gate driving unit including a scan driving unit for supplying a scan signal to the display panel and an emission control driving unit for supplying an emission control signal. The plurality of pixels include a light emitting element for emitting light in a brightness corresponding to a current amount of a driving current applied, a driving transistor for controlling the current amount applied to the light emitting element, a storage capacitor connected to the driving transistor, and a first transistor and a second transistor including an oxide semiconductor layer and configured to be simultaneously turned on according to the scan signal.