OLED Pixel Circuitry Integrating Shift Register and Inverter

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Solution Overview

Problem

In OLED display technologies, the integration of gate driving circuits on array substrates results in larger circuit areas and higher power consumption due to the separation of pixel and gate driving circuits.

Innovation Solution

A pixel circuitry comprising a shift register unit, an inverter, and a pixel driving circuit, where the shift register unit generates a first drive signal and an inverter generates a second drive signal with opposite phases, simplifying the structure and reducing power consumption by integrating these functions on the array substrate.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If gate driving circuits are integrated on array substrates using GOA technologies, then manufacturing cost is reduced and process integration level is improved, but pixel circuitry structure becomes more complex and power consumption increases

Engineering Contradiction:

Improvemanufacturing costVSAvoidpixel circuitry structure

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The patent merges the pixel driving circuit and gate driving circuit into a single integrated pixel circuitry. The shift register unit is directly coupled with the light emitting device control circuitry, eliminating the need for separate gate driving circuits on the array substrate. This integration reduces manufacturing complexity while maintaining the cost benefits of GOA technologies.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The pixel circuitry is designed to perform multiple functions: it acts as both a pixel driving circuit for controlling the light emitting device and as a gate driving circuit for scanning multiple pixels. The shift register unit can sequentially output drive signals to different pixels, providing universal functionality that reduces overall system complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Ease of manufacture

If gate driving circuits are integrated on array substrates using GOA technologies, then manufacturing cost is reduced and process integration level is improved, but power consumption increases

Engineering Contradiction:

Improvemanufacturing costVSAvoidpower consumption

Core Design Contradiction:

Ease of manufactureVSUse of energy by moving object

Solution Approach 1:

The patent employs periodic clock signals (first clock signal and second clock signal with opposite phases) to control the shift register unit. This periodic action allows the circuit to operate in discrete timing cycles, enabling efficient signal transmission and reducing continuous power consumption. The dual-clock mechanism ensures that transistors are switched on and off in alternating phases, minimizing simultaneous current draw.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The pixel circuitry generates its own drive signals internally through the shift register unit, eliminating the need for external gate driving circuits. This self-service capability reduces the overall power consumption of the display system by removing redundant driving circuitry and reducing the number of external signal sources required.

Inventive Principle:

Principle #25Self-service

3Device complexity

If separate pixel and gate driving circuits are used, then pixel circuitry structure is simpler, but manufacturing cost increases and integration level decreases

Engineering Contradiction:

Improvepixel circuitry structureVSAvoidmanufacturing cost

Core Design Contradiction:

Device complexityVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #5Merging (Combining)

4Use of energy by moving object

If dual clock signals with opposite phases are used, then power consumption is reduced and integration is improved, but circuit structure becomes more complex

Engineering Contradiction:

Improvepower consumptionVSAvoidcircuit structure

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The patent uses asymmetric clock signal phases (opposite phases for first and second clock signals) to optimize power consumption. This asymmetric timing arrangement ensures that transistors controlled by different clock signals do not switch simultaneously, reducing peak current draw and power consumption. The asymmetric design is efficiently implemented within the integrated circuit structure.

Inventive Principle:

Principle #4Asymmetry

Data Source

PatentUS11263972B2Pixel circuitry and drive method thereof, array substrate, and display panel

Publication Date: 2022.03.01 BEIJING BOE OPTOELECTRONCIS TECH CO LTD

AI summary

Embodiments of the present disclosure provide a pixel circuitry and a drive method thereof, an array substrate, and a display panel. The pixel circuitry includes a shift register unit, an inverter, and a pixel driving circuit. The shift register unit is configured to provide a first drive signal under the control of an enable signal, a first clock signal, and a second clock signal. The inverter is configured to invert the first drive signal to generate a second drive signal. The pixel driving circuit is configured to control a light emitting device according to the first drive signal and the second drive signal.