OLED Pixel Circuit Shared Capacitor Signal Interference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Decreasing the size of elements in organic light-emitting display devices to increase pixel density leads to interference between signals, making it difficult to display high-quality images.
Innovation Solution
A pixel circuit design that includes a common capacitor shared between pixels, with switching transistors, storage capacitors, and driving transistors, which temporarily adjusts capacitance to minimize signal interference and maintain stable electric potential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the size of elements (capacitors, transistors) is decreased to increase pixel density, then pixel density increases, but signal interference occurs and image quality deteriorates
Solution Approach 1:
The patent merges the storage capacitor function into a shared common capacitor that is shared among multiple pixels in the same column. This consolidation reduces the total number of capacitors and their associated areas, enabling smaller pixel sizes and higher pixel density while maintaining sufficient capacitance to minimize signal interference through proper sharing architecture
Solution Approach 2:
The common capacitor serves multiple functions: it acts as the storage capacitor for multiple pixels simultaneously, reducing the need for individual storage capacitors in each pixel. This multi-functional design allows the same component to serve different pixels at different times, increasing pixel density while maintaining image quality by eliminating the harmful effect of multiple small capacitors that would cause signal interference
2Quantity of substance
If the size of elements is decreased, then pixel density increases, but the ability to maintain stable electric potential decreases due to interference
Solution Approach 1:
By merging individual storage capacitors into a shared common capacitor, the patent achieves larger effective capacitance value that can maintain stable electric potential. The shared capacitor's larger size compared to individual small capacitors provides better charge storage capability, stabilizing the electric potential for multiple pixels simultaneously while allowing higher pixel density
Solution Approach 2:
The common capacitor acts as an intermediary that mediates between multiple pixels and the data lines. It provides a stable charge storage interface that isolates pixels from direct data line connections, maintaining stable electric potential while enabling smaller pixel sizes and higher density through the sharing mechanism
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 design allows for increased pixel density while maintaining high image quality by reducing signal interference through dynamic capacitance adjustment, enabling smaller pixel sizes without compromising image quality.
Implementation Method 1
a first organic light-emitting diode (OLED) emitting light corresponding to the first driving current
Data Source
AI summary
Provided is an organic light-emitting display device including: a first pixel; a second pixel; and a common capacitor connected to the first and second pixels, wherein the first pixel comprises: a first switching transistor transmitting a first data signal in response to a first scan signal; a second switching transistor transmitting the first data signal to the common capacitor; a first storage capacitor storing a charge corresponding to the first data signal; a first driving transistor generating a driving current corresponding to the charge stored in the first storage capacitor; and a first organic light-emitting diode (OLED) emitting light corresponding to the first driving current, and wherein the second pixel comprises: a third switching transistor transmitting a second data signal in response to a second scan signal; a fourth switching transistor transmitting the second data signal to the common capacitor; a second storage capacitor storing a charge corresponding to the second data signal; a second driving transistor generating a driving current corresponding to the charge stored in the second storage capacitor; and a second organic light-emitting diode (OLED) emitting light corresponding to the second driving current.