Auxiliary Capacitor Drive Transistor Cut-Off Display Panel Miniaturization
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Solution Overview
Problem
The existing display technologies face challenges in miniaturization due to the need for a pulse width adjustment circuit on the display panel, which increases the circuit size and hinders the reduction of the display panel's size, as the pulse width of the drive pulse needs to be shortened to correct for transistor variations affecting light emitting luminance.
Innovation Solution
A display device configuration that includes a pixel array with a write transistor, a retention capacitor, a drive transistor, and an auxiliary capacitor, where the auxiliary capacitor sets the operation point of the drive transistor to a cut-off region after threshold value correction, eliminating the need to shorten the pulse width and thus reducing the circuit size of peripheral circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a pulse width adjustment circuit is formed on the display panel to generate a shortened pulse signal, then the correction period can be shortened, but the circuit size of peripheral circuits increases
Solution Approach 1:
The patent extracts the pulse width adjustment function from the display panel's peripheral circuits by moving it to an external signal generation device. This allows the correction period to be shortened without increasing the circuit size on the display panel, as the pulse width adjustment is performed externally before the signal is input to the display panel.
Solution Approach 2:
The patent introduces an external signal generation device as an intermediary between the control system and the display panel. This intermediary performs the pulse width adjustment function, enabling the correction period to be shortened while keeping the display panel's peripheral circuit size unchanged.
2Productivity
If the pulse width of the drive pulse is shortened to shorten the correction period, then the correction operation can be completed faster, but a pulse width adjustment circuit is required which increases device complexity
Solution Approach 1:
The patent extracts the pulse width adjustment function from the display panel's internal circuits and relocates it to an external signal generation device. This extraction allows faster correction operations without increasing the complexity of the display panel's device structure.
Solution Approach 2:
The patent uses an external device to generate the adjusted pulse signal, effectively creating a copy of the pulse width adjustment function outside the display panel. This approach achieves fast correction operations without adding complex circuitry to the display panel itself.
3Area of stationary object
If the frame region area is increased to accommodate peripheral circuits, then more circuit components can be disposed, but miniaturization of the display panel is hindered
Solution Approach 1:
The patent extracts the pulse width adjustment circuit from the display panel's frame region and relocates it to an external device. This extraction reduces the area required in the frame region, enabling display panel miniaturization while maintaining the ability to perform fast correction operations.
Solution Approach 2:
The patent moves the pulse width adjustment function from the two-dimensional plane of the display panel's frame region to an external three-dimensional space. This dimensional transition allows the display panel to be miniaturized while the correction function is maintained in the external device.
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 configuration allows for reduced circuit size in the pixel array, enabling miniaturization of the display panel without the need for a pulse width adjustment circuit, thereby improving yield and reducing costs.
Implementation Method 1
an auxiliary capacitor of which one terminal is connected to a source node of the drive transistor... provides a potential change to a source electrode of the drive transistor by coupling through the auxiliary capacitor
Data Source
AI summary
A display device according to the present disclosure includes: a pixel array unit (30) in which pixel circuits (20A) are disposed in a matrix form, the pixel circuits each including a light emission unit (21), a write transistor (23) that writes a signal voltage (Vsig) of a video signal, a retention capacitor (24) that retains the signal voltage (Vsig) written by the write transistor (23), a drive transistor (22) that drives the light emission unit (21) on the basis of the signal voltage (Vsig) retained by the retention capacitor (24), and an auxiliary capacitor (25) of which one terminal is connected to a source node of the drive transistor (22); and a control unit (90) that provides a potential change to a source electrode of the drive transistor (22) by coupling through the auxiliary capacitor (25) to set an operation point of the drive transistor (22) as a cut-off region after the threshold value correction process.