Display Pixel Circuit Voltage Segmentation for Uniform Brightness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing AMOLED and AMQLED light emitting base plates face challenges in ensuring uniform brightness and stable driving voltage across different light emitting pixels, particularly due to the high driving voltage of blue-light devices leading to excessive voltage application in red-light and green-light devices, causing increased heating and power consumption.
Innovation Solution
A pixel circuit design with series-connected first and second driving circuits, each with different channel types, and optionally including a bleeder component for current balancing, allows for voltage division and independent control of light emitting devices, reducing power consumption and stabilizing driving currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the driving voltage is determined according to the maximum brightness value to ensure uniform brightness, then the brightness uniformity is improved, but the power consumption increases due to excessive voltage application in red-light and green-light devices
Solution Approach 1:
The patent divides the driving voltage control into separate segments for different light emitting devices. By using separate driving circuits for red-light, green-light, and blue-light devices, each circuit can be optimized for its specific device characteristics, allowing voltage determination based on actual device needs rather than maximum brightness requirements, thereby reducing power consumption while maintaining brightness uniformity.
Solution Approach 2:
The patent applies different driving voltage levels to different light emitting devices based on their specific requirements. Each light emitting device receives the voltage level appropriate for its type (red, green, or blue), rather than applying the maximum voltage uniformly to all devices. This localized voltage optimization reduces overall power consumption while ensuring each device operates at its optimal brightness level.
2Illumination intensity
If the driving voltage is determined according to the maximum brightness value, then the brightness uniformity is improved, but the heating increases due to excessive voltage application
Solution Approach 1:
The patent segments the voltage control system into separate driving circuits for different light emitting devices. This segmentation allows each circuit to operate at appropriate voltage levels suited to its specific device, preventing excessive voltage application that would cause overheating, while still achieving uniform brightness across all devices.
Solution Approach 2:
The patent implements local quality by providing customized voltage control for each light emitting device type. Each device receives the specific voltage level it needs rather than a uniform maximum voltage, which directly reduces heat generation while maintaining brightness uniformity across the display.
3Use of energy by moving object
If series-connected driving circuits with different channel types are used, then the power consumption is reduced, but the device complexity increases
Solution Approach 1:
The patent segments the driving circuit into multiple independent circuits with different channel types (P-type and N-type) that work in series. This segmentation allows the system to achieve power consumption reduction through coordinated operation of different transistor types, and the modular nature of the segmentation makes the increased complexity more manageable and systematic.
Data Source
AI summary
The display panel and a light emitting base plate are provided. The display panel includes a pixel circuit disposed on a base plate, wherein the pixel circuit includes a first driving circuit, a first light emitting device, a second light emitting device and a second driving circuit that are sequentially connected in series; the first driving circuit includes a first driving transistor, a source electrode of the first driving transistor is connected to a first power-supply terminal, and a drain electrode of the first driving transistor is connected to a first electrode of the first light emitting device; the second driving circuit includes a second driving transistor, a source electrode of the second driving transistor is connected to a second power-supply terminal, and a drain electrode of the second driving transistor is connected to a first electrode of the second light emitting device.