Pixel Circuit Frequency Modes for Dynamic and Static Display Images
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Solution Overview
Problem
Existing display devices face challenges in achieving high display quality while balancing fast response speed and low power consumption, particularly when displaying dynamic and static images concurrently.
Innovation Solution
A display device with a pixel circuit design that includes transistors and capacitors, allowing operation in single and multi-frequency modes, where different areas of the display panel operate at varying frequencies to optimize performance for dynamic and static images, and includes a reference voltage application before light emission to enhance image quality and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the display device operates in high frequency mode to achieve fast response speed, then response speed is improved, but power consumption increases
Solution Approach 1:
The display device dynamically adjusts operating frequency based on content type: high frequency mode for dynamic images requiring fast response, and low frequency mode for static images where fast response is not needed. This dynamic frequency adjustment resolves the contradiction by matching performance to actual requirements rather than maintaining fixed high performance constantly.
Solution Approach 2:
The patent changes the operating frequency parameter according to display requirements. By varying the frequency parameter between high and low states based on whether dynamic or static images are being displayed, the system achieves fast response when needed while consuming less power when fast response is not required.
2Manufacturing precision
If the display device operates in multi-frequency mode to optimize performance for different image types, then display quality is improved, but device complexity increases
Solution Approach 1:
The display panel is segmented into different operational regions or modes: first pixels operating at first frequency and second pixels operating at second frequency. This segmentation allows different parts of the display to operate at optimal frequencies for their specific content requirements, improving overall display quality while managing complexity through structured division.
Solution Approach 2:
The display device is designed with multi-functionality to operate in both single-frequency and multi-frequency modes. The same hardware infrastructure supports different operating modes, allowing the device to adapt to various display scenarios without requiring entirely separate systems for each mode.
3Manufacturing precision
If reference voltage is provided to the third node between transistors before light emission, then image quality and contrast ratio are improved, but circuit complexity increases
Solution Approach 1:
The reference voltage is applied to the third node between the first and second transistors before the light emitting element emits light. This preliminary voltage application prepares the transistor nodes for optimal operation during the emission phase, improving contrast ratio and image quality by ensuring proper voltage levels are established in advance.
Solution Approach 2:
The third node between the first and second transistors serves as an intermediary point where reference voltage is applied. This intermediate node acts as a mediator to stabilize the voltage levels for both transistors, improving overall circuit performance and image quality without requiring complete redesign of the transistor structure.
Data Source
AI summary
A display device includes a display panel including a pixel including a pixel circuit and a light emitting element, a plurality of scan lines connected to the pixel circuit, an emission control line connected to the pixel circuit, and a data line connected to the pixel circuit. The pixel circuit includes a first capacitor connected to a first node and a second node opposite to the first node, a first circuit portion that includes a first transistor connected between the data line and the first node and a second transistor connected between the first transistor and the first node, and a second circuit portion connected to the second node and the light emitting element. Before the light emitting element emits light, a reference voltage is provided to a third node between the first transistor and the second transistor.