Shared Power Supply Lines for Narrowing Display Frames
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Solution Overview
Problem
The challenge in developing high-definition organic EL display devices is the increase in power source supply lines and circuit complexity when using a drive transistor to control light emission and non-light emission periods, which hinders miniaturization and increases the screen frame size.
Innovation Solution
A configuration where one power source supply line is shared among multiple adjacent sub-pixels across multiple rows, reducing the number of power source supply lines and maintaining the circuit configuration complexity, allowing for smaller sub-pixel sizes and narrower screen frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a drive transistor is provided in each pixel circuit to control light emission and non-light emission periods, then the electro-optic element can continue emitting light over one frame period, but the number of power source supply lines increases and circuit complexity increases
Solution Approach 1:
The patent merges the power source supply function for multiple rows into a single shared power source supply line. Specifically, one power source supply line is configured to supply power to drive transistors across multiple rows of pixel circuits, eliminating the need for separate power source supply lines for each row. This reduces the total number of power source supply lines while maintaining the ability to control light emission duration through the drive transistor.
2Duration of action of stationary object
If a drive transistor is provided in each pixel circuit to control light emission and non-light emission periods, then the electro-optic element can continue emitting light over one frame period, but the screen frame size increases
Solution Approach 1:
The patent merges adjacent power source supply lines into a single shared line that serves multiple rows. This consolidation reduces the horizontal space required for power source supply lines, thereby narrowing the screen frame size while still enabling the drive transistor to control the light emission duration of the electro-optic element throughout one frame period.
3Ease of operation
If the number of power source supply lines is increased to provide independent control, then the power source supply scanning circuit complexity increases, but this enables precise control of each pixel
Solution Approach 1:
The patent combines the power source supply function for multiple rows into a single shared power source supply line, which simplifies the power source supply scanning circuit. The scanning circuit only needs to manage one power source supply line instead of multiple separate lines, reducing circuit complexity while still enabling precise control of each pixel through the drive transistor's gate electrode.
4Ease of operation
If separate power source supply lines are used for each row, then each pixel can be independently controlled, but sub-pixel size increases due to more wiring space
Solution Approach 1:
The patent merges power source supply lines for multiple rows into a single shared line, reducing the wiring space required in each sub-pixel. This allows sub-pixels to be miniaturized while maintaining independent control capability through the drive transistor, which regulates the current to the electro-optic element based on signals received during the scanning period.
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 high-definition display with reduced power consumption and miniaturized sub-pixel sizes, while maintaining the complexity of the power source supply scanning circuit, thus narrowing the screen frame and enhancing display panel performance.
Implementation Method 1
an electro luminescence (EL) display device using an organic EL element utilizing such a phenomenon that application of an electric field across an organic thin film causes the organic thin film to emit a light
Data Source
AI summary
A display device includes a pixel array portion in which sub-pixels each including an electro-optic element, a write transistor for writing a video signal, a hold capacitor for holding the video signal written by the write transistor, and a drive transistor for driving the electro-optic element in accordance with the video signal held in the hold capacitor are disposed in a matrix, and each unit pixel is composed of the plurality of adjacent sub-pixels belonging to a plurality of rows. The display device further includes power source supply lines through which power source potentials different in potential from one another are selectively supplied to the drive transistors. One power source supply line is wired every plural rows.