Level Shifter Control for Abnormal OLED Display Turn-Off
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Solution Overview
Problem
Display devices, particularly organic light emitting displays, can malfunction and cause accidents due to abnormal turn-off, leading to display errors such as flickering or horizontal stripes, which can distract drivers and increase the risk of accidents.
Innovation Solution
A display device with a level shifter that includes a scan channel circuit, a charge pump circuit, and an emission channel circuit to control the emission signal and prevent abnormal turn-off by blocking the emission control transistor, thereby reducing display errors and accidents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the display panel is abnormally turned off during driving process, then power consumption is reduced, but display errors such as flickering or horizontal stripes occur causing accidents
Solution Approach 1:
The level shifter performs preliminary detection of power supply abnormalities and proactively generates control signals to block the emission control transistor before display errors can occur. This advance action prevents the harmful effect of flickering or horizontal stripes while ensuring clean power shutdown.
Solution Approach 2:
The level shifter acts as an intermediary component between the power supply and the emission control transistor. It monitors power supply status and mediates the control signal to the emission control transistor, blocking it during abnormal power conditions to prevent display errors while maintaining normal operation during stable power supply.
2Reliability
If the emission control transistor is blocked during abnormal turn-off, then display errors are eliminated, but additional control circuitry is required
Solution Approach 1:
The level shifter performs multiple functions: it levels the voltage signal from the gate driving circuit, detects power supply abnormalities, and generates control signals to block the emission control transistor during abnormal conditions. By consolidating these functions into a single component, the patent avoids adding separate complex control circuits while achieving reliable display error prevention.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents or reduces accidents by ensuring stable operation of the display panel, eliminating display errors, and minimizing power consumption during abnormal conditions.
Implementation Method 1
a charge pump circuit generating a high-potential emission voltage using circuit power of a host system
Data Source
AI summary
A level shifter or a display device comprising a level shifter includes a scan channel circuit generating a scan start signal for a plurality of subpixels according to a first input signal, a charge pump circuit generating a high-potential emission voltage using circuit power of a host system, and an emission channel circuit controlling an emission start signal according to a second input signal with a change in the circuit power reflected.