OLED Pixel Circuit for 3D Display at 120 Hz
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Solution Overview
Problem
Existing organic light emitting displays face challenges in achieving 3D imaging at low driving frequencies, which results in increased power consumption, reduced stability, and higher manufacturing costs due to the need for high driving frequencies like 240 Hz to maintain image clarity within a 16.6 ms frame period.
Innovation Solution
The proposed solution involves a pixel design with an organic light emitting diode (OLED) and a pixel circuit that includes transistors and capacitors, where data signals are charged and emitted in synchronization with scan signals, allowing for alternating left and right image generation in each frame, enabling 3D imaging at a lower driving frequency of 120 Hz by optimizing the charging and emission control of voltages across capacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high driving frequency (240 Hz) is used to maintain image clarity for 3D imaging, then image quality is improved, but power consumption increases and manufacturing costs rise
Solution Approach 1:
The patent applies preliminary action by charging the first capacitor with data signal voltages before the emission period begins. The capacitor stores multiple voltage levels (VL1, VL2, VL3, VL4) in advance during the programming period, so that during the emission period the OLED can immediately display images without requiring continuous high-frequency signal updates. This pre-charging mechanism enables 3D imaging at lower driving frequencies while maintaining image clarity.
2Measurement precision
If high driving frequency (240 Hz) is used to maintain image clarity for 3D imaging, then image quality is improved, but manufacturing costs increase
Solution Approach 1:
By pre-charging the capacitor with multiple voltage levels before the emission period, the system can operate at lower driving frequencies (e.g., 120 Hz), which reduces the stress on display components and extends their operational life. This preliminary charging approach simplifies the driving requirements and reduces manufacturing costs associated with high-frequency operation, while still maintaining image clarity for 3D imaging.
3Measurement precision
If high driving frequency is used, then image clarity is maintained, but device stability decreases
Solution Approach 1:
The first capacitor is charged with data signal voltages during the programming period before the emission period begins. This preliminary charging action allows the pixel to maintain stable image display during the emission period without requiring continuous high-frequency updates. The stored voltages in the capacitor provide stable driving signals to the OLED, improving device stability while maintaining image clarity for 3D imaging at lower frequencies.
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
This approach allows for the realization of 3D images at a lower driving frequency of 120 Hz, reducing power consumption and manufacturing costs while maintaining image clarity, by simultaneously charging and emitting light components corresponding to left and right data signals in alternating frames.
Implementation Method 1
The organic light emitting display display images using organic light emitting diodes (OLED) that generate light by re-combination of electrons and holes
Implementation Method 2
a first capacitor coupled between the first node and a third power source to charge a first capacitor voltage corresponding to a data signal supplied from the data line
Data Source
AI summary
A pixel may include an organic light emitting diode (OLED) with a cathode electrode coupled to a second power source, a first transistor with a first electrode coupled to a data line, with a second electrode coupled to a first node, the first transistor being turned on when a scan signal is supplied to a scan line, a first capacitor coupled between the first node and a third power source to charge a first capacitor voltage corresponding to a data signal supplied from the data line, and a pixel circuit charged by the first capacitor voltage to supply current corresponding to a charged first power source voltage from a first power source to the second power source via the OLED.