5T-3C Pixel Circuit for Stereoscopic OLED Display
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Solution Overview
Problem
Existing stereoscopic image display technologies using organic light emitting display devices face challenges in achieving high luminance and low power consumption due to the need for inserting a black image between left and right images, which reduces operating speed and increases power consumption.
Innovation Solution
A pixel circuit with a 5T-3C structure that includes PMOS or NMOS transistors and capacitors, allowing for simultaneous emission of left and right images by storing image data during emission periods, thereby eliminating the need for a black image and improving operating speed and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a black image is inserted between left and right images in existing stereoscopic display technologies, then luminance can be maintained, but operating speed decreases and power consumption increases
Solution Approach 1:
The pixel circuit enables continuous display of stereoscopic images by eliminating the black image insertion period. The circuit maintains continuous operation through simultaneous emission of left and right images using dual capacitor storage, removing idle time and maintaining productive action throughout the display cycle.
Solution Approach 2:
The circuit performs preliminary data writing and capacitor charging operations during the emission period of the other eye's image. Image data is stored in capacitors in advance during the simultaneous emission window, preparing for the next frame without requiring additional black insertion periods.
2Use of energy by stationary object
If a black image is inserted between left and right images, then power consumption increases, but this was traditionally used to manage luminance in stereoscopic displays
Solution Approach 1:
The circuit merges the data writing operation with the emission operation by simultaneously writing data to capacitors while emitting images. This combination eliminates separate time periods for data preparation and image display, achieving both functions in parallel without requiring black image insertion.
Solution Approach 2:
The circuit dynamically switches between different operational modes using control signals (EMIT1, EMIT2, WRITE). The transistor network dynamically reconfigures connections between capacitors and data lines during different phases, enabling flexible timing that eliminates the need for static black insertion periods.
3Productivity
If simultaneous emission of left and right images is implemented, then operating speed improves and power consumption reduces, but circuit complexity increases
Solution Approach 1:
The capacitor network serves multiple functions: storing image data, maintaining voltage during emission, and enabling simultaneous display of both eyes' images. The same capacitors and transistors are reused across different operational phases, reducing the need for additional dedicated components for each function.
Solution Approach 2:
The pixel circuit is segmented into functional modules: data writing module (transistors controlling data line connections), emission module (transistors controlling OLED current), and storage module (capacitors holding image data). This segmentation allows independent optimization of each module while achieving overall simultaneous emission functionality.
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
The solution enables high-speed operation and reduced power consumption while maintaining luminance by simultaneously displaying left and right images without the insertion of a black image, improving the overall performance of organic light emitting display devices in stereoscopic image display.
Implementation Method 1
an organic light emitting diode, a cathode electrode of the organic light emitting diode being coupled to a second power voltage
Data Source
AI summary
A pixel circuit includes an organic light emitting diode, a first PMOS transistor coupled between a first power voltage and an anode electrode of the organic light emitting diode, a second PMOS transistor coupled between a first node and the anode electrode of the organic light emitting diode, a first capacitor coupled between a second node and the first node, a second capacitor coupled between the first power voltage and the second node, a third PMOS transistor coupled between a data line and the second node, a fourth PMOS transistor coupled between a third node and the second node, a third capacitor coupled between the third node and a gate terminal of the third PMOS transistor, and a fifth PMOS transistor coupled between the data line and the third node.