Pixel Memory Circuit Superposition for HDR Gray-Scale Displays
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Solution Overview
Problem
Display devices face challenges in achieving high image quality with increased gray-scale levels and dynamic range due to limitations in arithmetic processing and signal voltage amplitude, as well as complexity in driving mechanisms.
Innovation Solution
A display device configuration incorporating multiple memory circuits and transistors with metal oxide channels, allowing for the retention and combination of signals to control current flow through display elements, enabling greater gray-scale levels and dynamic range without excessive arithmetic processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If image synthesis is performed in an arithmetic processing circuit in a pixel, then multiple pieces of image data can be synthesized, but the amount of arithmetic processing becomes massive
Solution Approach 1:
The patent extracts the arithmetic processing function from the pixel and relocates it to a separate image synthesis circuit. The pixel retains only the display function while the image synthesis operation is performed externally, reducing the arithmetic processing burden on the pixel circuit.
Solution Approach 2:
The patent introduces a memory circuit as an intermediary between the image data input and the display element. The memory circuit stores image data and enables synthesis operations to be performed outside the pixel, acting as a buffer that decouples the arithmetic processing from the pixel's internal circuitry.
2Reliability
If the voltage amplitude of input signal is limited, then pixel can be driven within safe limits, but display with high dynamic range becomes difficult
Solution Approach 1:
The patent extends the dynamic range by utilizing multiple bits for gray-scale control. Instead of relying solely on voltage amplitude, the system uses additional bit dimensions to represent higher gray-scale levels, effectively expanding the dynamic range without increasing the voltage amplitude beyond safe limits.
Solution Approach 2:
The patent changes the parameter representation from direct voltage amplitude to multi-bit gray-scale codes. By encoding gray-scale levels as digital values rather than direct voltage proportions, the system can represent a wider range of intensities while maintaining voltage within safe operating boundaries.
3Manufacturing precision
If gray-scale code and driving interval are combined, then number of gray-scale levels can be increased, but driving of display device becomes complicated
Solution Approach 1:
The patent segments the gray-scale control into separate bit components. Each bit of the gray-scale code can be independently controlled and processed, allowing for simplified driving logic where each bit position corresponds to a specific weight in the overall gray-scale value, making the control mechanism more manageable.
4Manufacturing precision
If number of gray-scale levels is increased beyond source driver bit output, then higher image quality can be achieved, but it becomes difficult to perform display with that many gray-scale levels
Solution Approach 1:
The patent merges multiple signal paths and memory circuits to generate the required gray-scale levels. By combining outputs from multiple memory circuits that each store different bit portions of the gray-scale code, the system achieves high gray-scale resolution without requiring the source driver to independently generate all levels.
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 allows for display devices to achieve gray-scale levels exceeding the bit output of source drivers and perform high dynamic range imaging, simplifying the driving mechanism while maintaining image quality.
Implementation Method 1
a transistor (120), and a light-emitting element (123). The transistor (120) has a function of controlling current flowing through the light-emitting element (123) by application of a voltage, which is obtained by addition of the first signal to the fourth signal, to a gate
Data Source
AI summary
To provide a display device capable of displaying a plurality of images by superimposition using a plurality of memory circuits provided in a pixel. A plurality of memory circuits are provided in a pixel, and signals corresponding to images for superimposition are retained in each of the plurality of memory circuits. In the pixel, the signals corresponding to the images for superimposition are added to each of the plurality of memory circuits. The signals are added to the signals retained in the memory circuits by capacitive coupling. A display element can display an image corresponding to a signal in which a signal written to a pixel through a wiring is added to the signals retained in the plurality of memory circuits. Reduction in the amount of arithmetic processing for displaying images by superimposition can be achieved.