Pixel Memory Circuit for Display Image Upconversion Correction
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Solution Overview
Problem
High-resolution display devices face challenges with increased circuit size and power consumption due to massive image data processing, leading to display delays and quality issues from variations in transistor characteristics, particularly in high-resolution displays with EL elements.
Innovation Solution
A display device with a pixel circuit that includes a memory circuit for storing correction data, using transistors with metal oxide channels, particularly In-Zn-based oxides, to perform image upconversion and correct image data by adding correction data capacitively, reducing the load on external devices and improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If upconversion processing is performed in a peripheral device, then image data can be processed before display, but circuit size and power consumption increase significantly
Solution Approach 1:
The pixel circuit is divided into functional modules: a memory circuit for storing correction data, a switching circuit for selecting between original and corrected image data, and a display element. This segmentation allows upconversion processing to be distributed across multiple pixels rather than concentrated in a single peripheral device, reducing the circuit size burden on any one component while maintaining the overall image processing capability.
2Reliability
If upconversion processing is performed in a peripheral device, then image data can be processed before display, but power consumption increases significantly
Solution Approach 1:
Each pixel circuit performs its own image correction operation using correction data stored locally in its memory circuit. The pixel circuit adds correction data to image data through capacitive coupling and selectively outputs either original or corrected data based on display conditions. This self-service approach eliminates the need for a power-hungry external processing device, significantly reducing overall power consumption while maintaining upconversion capability.
3Reliability
If all image data is corrected in external correction, then display quality can be improved, but a significant burden is placed on the external device
Solution Approach 1:
Correction data is stored and processed locally within each pixel circuit rather than being handled centrally by an external device. Each pixel circuit contains a memory circuit that stores correction data specific to that pixel, and the correction operation is performed locally by adding this correction data to the incoming image data through capacitive coupling. This local quality approach distributes the processing burden across all pixels, eliminating the significant burden on external devices while maintaining improved display quality.
4Reliability
If internal correction is performed in a pixel circuit, then correction can be done for each frame, but it is difficult to ensure enough correction period in high-resolution displays
Solution Approach 1:
Correction data is pre-calculated and stored in the memory circuit of each pixel circuit before the image data arrives. This preliminary action allows the pixel circuit to immediately add the correction data to the incoming image data without requiring time for real-time calculation, ensuring sufficient correction period even in high-resolution displays with short horizontal selection periods.
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
The solution enables efficient image processing and upconversion in high-resolution displays, reducing power consumption and display delays while improving image quality by compensating for transistor characteristic variations, thus providing a low-power and reliable display solution.
Implementation Method 1
a memory circuit that stores first data and generates third data by adding the first data to second data
Data Source
AI summary
To provide a display device capable of performing image processing. Each pixel is provided with a memory circuit in which desired correction data is retained. The correction data is generated by calculation in an external device and written to each pixel. The correction data is added to image data by capacitive coupling and supplied to a display element. Thus, the display element can display a corrected image. Through the correction, image upconversion can be performed, or image quality decreased because of variations in pixel transistor characteristics can be corrected.