Circuit Structure Preventing OLED Splash Screen via Preliminary Grounding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
OLED display panels often experience a 'splash screen' phenomenon during power-on due to floating output signals from pixel circuits, leading to uncontrollable light emission and a poor user experience, which current solutions attempt to address by redesigning the powering-on sequence or modifying the driving circuit, but these methods are time-consuming and not beneficial for production.
Innovation Solution
A circuit structure comprising a control circuit, switching circuit, data-line group, driving power line, and voltage lines is introduced, where the data-line group is grounded in the initial stage and disconnected in the working stage, using a first voltage to control the switching circuit and prevent abnormal light emission, thereby avoiding the splash screen phenomenon without requiring significant redesign or additional signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the powering-on sequence is redesigned to prevent splash screen phenomenon, then the reliability of display startup is improved, but the manufacturing time and complexity increase
Solution Approach 1:
The patent applies preliminary action by grounding the data line group before the pixel circuits finish their startup process. The switching circuit is controlled to connect the data line group to ground in advance, preventing floating output signals from causing abnormal light emission during the startup phase, thus eliminating the splash screen phenomenon without requiring redesign of the powering-on sequence
2Reliability
If additional control signals are added to prevent abnormal light emission, then the reliability of display operation is improved, but the device complexity increases
Solution Approach 1:
The patent applies universality by using an existing control signal that serves dual purposes: it controls the switching circuit to ground the data line group during startup, and simultaneously controls the display operation. This existing signal is reused to achieve multiple functions (preventing splash screen and controlling light emission) without adding new control signals, thus maintaining simplicity while improving reliability
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A circuit structure (100) includes: a control circuit (110), including a first end (111), a second end (112) and a control end (113); a switching circuit (120), including a first interface (121), a second interface (122) and a control interface (123); a driving power line (150), connected with the control end (113) of the control circuit (110) and configured to provide a driving power voltage in a working stage to conduct the first end (111) of the control circuit (110) and the second end (112) of the control circuit (110); and a first voltage line (140), connected with the first end (111) of the control circuit (110) and configured to, when the first end (111) of the control circuit (110) and the second end (112) of the control circuit (110) are conducted, provide a first voltage to the control interface (123) of the switching circuit (120) through the control circuit (110) to disconnect the first interface (121) of the switching circuit (120) from the second interface (122) of the switching circuit (120). The circuit structure (100) prevents a power-on splash phenomenon by modifying voltages on data lines prior to a normal operation of a display device (10).