Scan Driver Light Emitting Control for Display Devices
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Solution Overview
Problem
Conventional display devices require separate light emitting control transistors and drivers, which reduce the usable screen area due to the space needed for these components, making it challenging to control the light emitting time of each pixel efficiently.
Innovation Solution
A display device and driving method that utilize a scan driver to control the light emitting time of pixels by varying the number of scan signals applied to scan lines, eliminating the need for a separate light emitting control transistor and driver, allowing for precise control of light emitting periods without reducing the display screen area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate light emitting control transistors and drivers are added to control light emitting time, then light emitting control precision is improved, but device complexity increases and screen area is reduced
Solution Approach 1:
The patent merges the light emitting control function into the existing scan driver by utilizing the scan signal timing. Instead of adding separate control transistors and drivers, the invention combines multiple functions (scanning and light emitting control) into a single integrated control mechanism, thereby reducing device complexity while maintaining control precision.
Solution Approach 2:
The scan driver is designed to perform multiple functions: it both scans the display lines and controls the light emitting time of pixels. By making the scan driver universal, the invention eliminates the need for dedicated light emitting control components, reducing overall device complexity while preserving precise control capability.
2Measurement precision
If separate light emitting control transistors and drivers are added to control light emitting time, then light emitting control precision is improved, but screen area is reduced
Solution Approach 1:
The patent merges the light emitting control function into the existing scan driver by utilizing the scan signal timing. Instead of adding separate control transistors and drivers, the invention combines multiple functions (scanning and light emitting control) into a single integrated control mechanism, thereby reducing device complexity while maintaining control precision.
Solution Approach 2:
The scan driver is designed to perform multiple functions: it both scans the display lines and controls the light emitting time of pixels. By making the scan driver universal, the invention eliminates the need for dedicated light emitting control components, reducing overall device complexity while preserving precise control capability.
3Productivity
If conventional separate control components are used, then light emitting time control is achieved, but display efficiency is reduced due to area loss
Solution Approach 1:
The patent merges the light emitting control function into the existing scan driver by utilizing the scan signal timing. Instead of adding separate control transistors and drivers, the invention combines multiple functions (scanning and light emitting control) into a single integrated control mechanism, thereby reducing device complexity while maintaining control precision.
Solution Approach 2:
The scan driver is designed to perform multiple functions: it both scans the display lines and controls the light emitting time of pixels. By making the scan driver universal, the invention eliminates the need for dedicated light emitting control components, reducing overall device complexity while preserving precise control capability.
Data Source
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AI summary
A display device includes a plurality of pixels respectively coupled to first scan lines, second scan lines and data lines; and a scan driver to supply first scan signals to the first scan lines and second scan signals to the second scan lines, wherein the pixel includes a first transistor having a gate electrode connected to a first node, one electrode connected to a first power line, and other electrode connected to a second node; a second transistor having a gate electrode connected to a first scan line, one electrode connected to a data line, and other electrode connected to the first node, the second transistor being turned on in a first time period of a frame when the first scan signal is applied; a third transistor having a gate electrode connected to a second scan line, one electrode connected to the second node, and other electrode connected to an initialization line, the third transistor being turned on in the first time period and at least one second time period of the frame when the second scan signal is applied; a storage capacitor having one electrode connected to the first node and other electrode connected to the second node; and a light emitting diode having an anode connected to the second node and a cathode connected to a second power line, wherein the number of the first and second scan signals applied to the pixel during the frame period is different from each other.