Scan Driver Signal Timing for Display Luminance Consistency
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Solution Overview
Problem
Display apparatuses face challenges in minimizing luminance differences when driven at varying frequencies, as existing technologies struggle to synchronize scan signals and emission signals effectively across different driving modes.
Innovation Solution
A display apparatus with a scan driver that outputs scan and emission signals to pixels, adjusting the timing of emission signals based on driving frequency, utilizing a configuration of transistors and capacitors to manage voltage control nodes and invert signals, ensuring synchronized operation across different driving modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the display apparatus is driven with a lower driving frequency, then power consumption is reduced, but luminance difference between driving frequencies increases
Solution Approach 1:
The scan driver dynamically adjusts the output timing of emission signals based on the driving frequency. In the second driving mode with lower frequency, the emission signal is supplied once during the display period and multiple times during the blank period, creating a dynamic timing adjustment that compensates for luminance differences while maintaining lower power consumption
Solution Approach 2:
The patent changes the timing parameters of emission signal output according to driving frequency. By modifying when the emission signal is supplied (different timing in display period vs. blank period), the system maintains consistent luminance across different driving frequencies while operating at lower power consumption levels
2Illumination intensity
If the emission signal is supplied multiple times in the blank period, then luminance consistency is improved, but device complexity increases
Solution Approach 1:
The scan driver is designed to perform multiple functions using the same circuit structure. The emission signal output is configured to operate in different modes (first driving mode with single supply, second driving mode with multiple supplies during blank period) without requiring separate hardware circuits, thereby maintaining luminance consistency while avoiding excessive complexity increase
Solution Approach 2:
The scan driver uses dynamic control of the emission signal timing based on driving mode. The same emission signal generation circuitry is reused with different timing patterns, allowing the system to adapt between single supply (display period) and multiple supplies (blank period) without adding permanent complexity to the device structure
Data Source
AI summary
A display apparatus includes: a pixel part including a plurality of pixels, each of the plurality of pixels to receive a first scan signal and an emission signal; and a scan driver to output the first scan signal and the emission signal to each of the plurality of pixels. In a second driving mode in which the display apparatus is driven with a first driving frequency lower than a maximum driving frequency, the scan driver is to supply the first scan signal to the plurality of pixels according to the first driving frequency, and supply the emission signal to the plurality of pixels according to the maximum driving frequency.