Organic EL Display Pixel Cycle Control for Interference Fringe Suppression
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Solution Overview
Problem
In organic EL display devices, interference fringes caused by light emission unevenness lead to blurry images and poor visibility, which existing technologies struggle to fully address.
Innovation Solution
A display device with a pixel array where a predetermined amount of light emission variation is introduced, shortening the cycle of the light emission state to make interference fringes less recognizable, achieved by adjusting the inter-drain-source current of driving transistors through methods like changing channel width or using excimer laser annealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple matrix driving method is used, then the structure is simple, but large-scale and high-definition display cannot be realized
Solution Approach 1:
The patent introduces dynamic control mechanisms into the pixel circuit, using multiple transistors (driving transistor, switching transistor, storage transistor) to dynamically manage current flow and light emission timing. This dynamic architecture enables high-definition display while maintaining structural efficiency through functional integration.
2Manufacturing precision
If an active matrix method is used, then large-scale and high-definition display can be realized, but interference fringes appear due to light emission unevenness
Solution Approach 1:
The patent systematically adjusts multiple parameters including transistor channel widths (W1, W2, W3), capacitance values (C1, C2), and timing parameters to optimize current distribution. By changing these parameters, the light emission uniformity is improved while maintaining high-definition display performance, effectively suppressing interference fringes.
Solution Approach 2:
The storage capacitor and feedback transistor configuration creates a feedback mechanism that stabilizes the current flowing through the light emitting element. This feedback control compensates for variations in threshold voltage and ensures uniform light emission across all pixels, reducing interference fringes.
3Stability of the object's composition
If the cycle of light emission state is long, then the light emission state is stable, but interference fringes become more visible
Solution Approach 1:
The patent implements periodic switching of pixel states using scanning signals and timing control circuits. By carefully designing the periodicity and phase of these switching operations, the system achieves stable light emission while the periodic variation in emission timing prevents the formation of visible interference patterns.
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 effectively minimizes the visibility of interference fringes and enhances image clarity by altering the light emission state cycle to a frequency that surpasses human eye resolution, thereby improving display visibility.
Implementation Method 1
An organic EL (Electro Luminescence) element has advantages such as high visibility due to self-coloring
Implementation Method 2
an amorphous silicon film 302 is formed on a glass substrate 301, an excimer laser 320 is radiated to the amorphous silicon film 302 to perform modification to polysilicon
Implementation Method 3
an excimer laser 320 is radiated to the amorphous silicon film 302 to perform modification to polysilicon
Data Source
AI summary
There is provided a display device including a pixel array unit in which a plurality of pixels are arrayed in a matrix shape. A predetermined amount of light emission variation is added to a light emission state of each pixel and a cycle of the light emission state of the pixel array unit in the case of the addition is shorter than the cycle of a light emission state of the pixel array unit before the predetermined amount of light emission variation is added.