Display Device Scan Driver Frequency Segmentation
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Solution Overview
Problem
Display devices operating at low frequencies experience a drop in quality due to inefficiencies in power consumption and driving efficiency, leading to suboptimal performance.
Innovation Solution
A display device architecture that includes multiple scan drivers and a timing controller to manage scan signals at different frequencies, allowing for efficient operation by adjusting the output frequencies of scan drivers and data drivers based on driving conditions, thereby optimizing power usage and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If display devices are operated at low frequencies to reduce power consumption, then power consumption is reduced, but display quality deteriorates
Solution Approach 1:
The scan driver is divided into multiple independent scan drivers (first scan driver, second scan driver, third scan driver) that can operate at different frequencies. This segmentation allows the display device to use multiple low-frequency scan signals simultaneously, achieving the same effective scanning speed as a single high-frequency driver while consuming less power overall.
Solution Approach 2:
Multiple scan signals from different scan drivers are merged/combined to achieve the overall scanning function. The first, second, and third scan drivers work together to scan different regions or perform different functions (normal scanning, self-scanning, initialization) that collectively maintain display quality while operating at lower individual frequencies.
2Reliability
If a single scan driver operates at high frequency to maintain display quality, then display quality is maintained, but power consumption increases
Solution Approach 1:
The single high-frequency scan driver is segmented into multiple low-frequency scan drivers. Each scan driver operates at a lower frequency (e.g., 1/2 or 1/3 of the original frequency), reducing their individual power consumption while collectively maintaining the required scanning performance through coordinated operation.
Solution Approach 2:
The multiple scan drivers operate periodically with different timing sequences. The first scan driver performs normal scanning, the second performs self-scanning during specific periods, and the third performs initialization. This periodic coordination allows the system to maintain display quality while each driver consumes less power due to lower operating frequency.
3Use of energy by moving object
If multiple scan drivers are used to reduce power consumption, then power consumption is reduced, but device complexity increases
Solution Approach 1:
Each scan driver is designed with multi-functionality to reduce overall system complexity. The first scan driver can perform both normal scanning and self-scanning functions, the second scan driver handles initialization and self-scanning, and the third scan driver handles initialization. This universal design allows fewer specialized components while maintaining the required functionality.
Solution Approach 2:
The system dynamically adjusts which scan drivers are active based on the driving frequency. At different operating frequencies, different combinations of scan drivers are activated (e.g., first and second at 120Hz, first, second, and third at 60Hz). This dynamic configuration optimizes the balance between power consumption and complexity for each operating condition.
Data Source
AI summary
A display device including: pixels coupled to first scan lines, second scan lines, emission control lines, and data lines; a first scan driver configured to supply a first scan signal to each of the first scan lines at a first frequency; a second scan driver configured to supply a second scan signal to each of the second scan lines at a second frequency corresponding to a driving frequency of the pixels; an emission driver configured to supply an emission control signal to each of the emission control lines at the first frequency; a data driver configured to supply a data signal to each of the data lines at the second frequency; and a timing controller configured to control the first scan driver, the second scan driver, the emission driver, and the data driver.