Pixel Transistor Circuit With Capacitive Coupling for HDR Correction
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Solution Overview
Problem
Display devices face challenges in properly displaying images with high dynamic range (HDR) and high resolution without converting image data, leading to increased power consumption and the need for dedicated circuits for data conversion.
Innovation Solution
A display device structure incorporating transistors and capacitors that allow for image data correction and upconversion operations within the pixels, enabling HDR display and improved luminance without data conversion, using metal oxide transistors with In, Zn, and M (such as Al, Ti, Ga, Sn, Y, Zr, La, Ce, Nd, or Hf) in the channel formation region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dedicated circuits for data conversion are added to display devices, then high dynamic range (HDR) and high resolution display capability is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent divides the data conversion function into multiple independent transistor circuits within each pixel unit. Instead of using a single dedicated conversion circuit for the entire display, each pixel contains segmented transistor circuits (including switching transistors, storage transistors, and compensation transistors) that independently handle data conversion tasks, thereby distributing complexity and enabling HDR and high resolution display without requiring a centralized complex conversion system
Solution Approach 2:
The transistor circuits described in the patent serve multiple functions: they perform data conversion, store image data, compensate for threshold voltage variations, and control pixel switching. This multi-functionality eliminates the need for separate dedicated circuits for each function, reducing overall device complexity while maintaining HDR and high resolution display capabilities
2Adaptability or versatility
If dedicated circuits for data conversion are added to display devices, then high dynamic range (HDR) and high resolution display capability is improved, but power consumption increases
Solution Approach 1:
The patent employs periodic switching of transistor circuits within each pixel to perform data conversion only when needed (during specific time periods for data writing and reading). The switching transistors are activated periodically to convert data between different voltage levels for HDR display, rather than continuously operating conversion circuits, thereby reducing power consumption while maintaining display capability
Solution Approach 2:
The patent extracts the data conversion function from a separate dedicated circuit and integrates it directly into the pixel transistor circuits. This eliminates the need for a power-hungry external conversion circuit and reduces overall power consumption by performing conversion operations locally within each pixel using the existing transistor structure
3Manufacturing precision
If image data conversion is performed externally, then proper display at high resolution is achieved, but loss of time occurs due to conversion processing
Solution Approach 1:
The patent performs image data conversion in advance within each pixel circuit before the data is needed for display. The transistor circuits pre-convert the image data to the appropriate voltage levels and store it in storage transistors, so that when display is required, the converted data is already ready, eliminating time loss during actual display operation
Solution Approach 2:
The patent merges the data conversion function with the image data storage and display functions within the same pixel circuit. Instead of separating conversion, storage, and display operations into different stages and circuits, all these functions are combined in a single integrated pixel structure, eliminating the time required for sequential processing and improving display precision
4Reliability
If more transistors are added to each pixel for image data correction, then image quality and luminance are improved, but device complexity increases
Solution Approach 1:
The patent applies different transistor circuit configurations to different regions or functions within each pixel based on local requirements. For example, switching transistors use one configuration optimized for data routing, storage transistors use another configuration optimized for data retention, and compensation transistors use a third configuration optimized for threshold voltage correction. This localized optimization improves image quality without requiring a uniform increase in complexity across the entire device
Data Source
AI summary
A display device capable of improving image quality is provided. A storage node is provided in each pixel and first data can be held in the storage node. Second data is added to the first data by capacitive coupling, which can be supplied to a display element. Thus, the display device can display a corrected image. A reference potential for the capacitive coupling operation is supplied from a power supply line or the like, and thus the first data and the second data can be supplied from a common signal line.