OLED Pixel Circuit for Stereoscopic Display Efficiency
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Solution Overview
Problem
As display panels increase in size and resolution, particularly when displaying stereoscopic images, existing technologies face challenges in efficiently driving the display device to alternately display left-eye and right-eye images at high frequency, leading to difficulties in programming image data and maintaining a sufficient aperture ratio.
Innovation Solution
The proposed solution involves a pixel structure with multiple transistors and capacitors that allow for simultaneous data programming and light emission, using a driving method that overlaps scan and light emission periods, and includes initialization and compensation steps to manage threshold voltages, ensuring efficient data storage and light emission across frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If display panel size and resolution are increased to display high-quality stereoscopic images, then image quality is improved, but data programming time increases and aperture ratio decreases
Solution Approach 1:
The patent merges the data programming operation and light emission operation into a single time period. The switching transistor is controlled to store data voltage in the first capacitor during the same period when the organic light emitting diode emits light, eliminating the need for separate programming and emission phases and thus reducing data programming time while maintaining image quality.
Solution Approach 2:
The patent performs preliminary data storage by storing data voltage in the first capacitor during the light emission period of the previous frame. This preliminary action allows the data to be ready for the next frame's light emission, enabling overlapping of operations and reducing the effective data programming time required for each frame.
2Manufacturing precision
If display panel size and resolution are increased to display high-quality stereoscopic images, then image quality is improved, but aperture ratio decreases
Solution Approach 1:
The patent segments the pixel circuit into multiple functional components: a driving transistor for current control, a first capacitor for data storage, a second capacitor for threshold voltage compensation, and specialized transistors for initialization and compensation. This segmentation allows each component to be optimized for its specific function, enabling better space utilization and maintaining aperture ratio while supporting high-resolution stereoscopic display.
Solution Approach 2:
The patent changes the operational parameters by introducing threshold voltage compensation using the second capacitor, which stores the threshold voltage of the driving transistor. This compensation mechanism allows the system to maintain stable operation at higher resolutions by adjusting for threshold voltage variations, thereby preserving aperture ratio while improving image quality.
3Productivity
If data programming time is reduced to improve display efficiency, then productivity is improved, but threshold voltage deviations increase
Solution Approach 1:
The patent implements feedback by using the second capacitor to store and compensate for the threshold voltage of the driving transistor. The compensation transistor uses this stored threshold voltage information to adjust the gate voltage, creating a feedback mechanism that maintains stable operation even when data programming time is reduced. This feedback ensures reliability is maintained while improving productivity.
Solution Approach 2:
The patent performs preliminary threshold voltage compensation by storing the threshold voltage in the second capacitor during the data programming phase. This preliminary action ensures that the threshold voltage is accounted for before the light emission phase, allowing the system to maintain stable operation with reduced programming time by having compensation data ready in advance.
4Productivity
If multiple transistors and capacitors are added to enable simultaneous data programming and light emission, then productivity is improved, but device complexity increases
Solution Approach 1:
The patent makes the switching transistor multi-functional by using it for both data programming (storing data voltage in the first capacitor) and light emission control (controlling the organic light emitting diode). This multi-functionality reduces the need for separate dedicated transistors, thereby improving productivity while limiting the increase in device complexity.
Solution Approach 2:
The patent combines the data storage function and light emission function into a single operational period by controlling the switching transistor to perform both operations simultaneously. This merging of functions allows the pixel circuit to achieve higher productivity without proportionally increasing complexity, as the same hardware resources are utilized for multiple purposes.
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 enables the display of high-resolution stereoscopic images with a sufficient aperture ratio, improving image quality by optimizing data programming time and reducing the influence of threshold voltage deviations, thus enhancing the display's efficiency and stability.
Implementation Method 1
an organic light emitting material emitting light by the electric field
Data Source
AI summary
An organic light emitting diode (OLED) display device is disclosed. In one aspect, the device includes a plurality of pixels. Each of the pixels includes 1) a driving transistor controlling a driving current supplied to an OLED, 2) a first capacitor connected to a first electrode of the driving transistor and 3) a switching transistor connecting the first capacitor and the data line. Each pixel further includes a first light emission transistor transmitting a first power source voltage to the first electrode of the driving transistor and a second capacitor connected between the gate electrode of the driving transistor and the first power source voltage. When the first power source voltage is applied to the first electrode of the driving transistor, the corresponding scan signal of a gate-on voltage is supplied and thus the corresponding data voltage is stored in the first capacitor.