Pixel Block Voltage-Addition Circuit for High-Aperture Displays
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Solution Overview
Problem
Existing display devices face challenges in achieving high image quality, supplying sufficient voltage to display elements, enhancing luminance, increasing frame frequency, and improving aperture ratio while maintaining low power consumption and high reliability.
Innovation Solution
A display device comprising multiple pixel blocks, each including a first circuit and a plurality of second circuits, where the first circuit adds data to generate a third data, and the second circuits retain and display the third data. The first circuit includes transistors and a capacitor, and the second circuits include transistors and display elements, allowing for efficient voltage supply and data processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the output voltage of the source driver is increased to supply higher voltage to the display element, then the luminance of the displayed image is enhanced, but the power consumption increases and a new driver IC is required
Solution Approach 1:
The pixel circuit merges multiple functions (voltage addition, data retention, and display control) into a single integrated circuit block. The first circuit adds voltages to generate a third voltage, while the second circuit retains this voltage and controls the display element, eliminating the need for a separate high-voltage driver IC and reducing overall power consumption.
Solution Approach 2:
The first circuit acts as an intermediary voltage generator that combines source driver output with an additional voltage to produce a third voltage. This intermediary circuit enables high voltage supply to the display element without requiring the source driver itself to output high voltage, thus avoiding increased power consumption in the driver.
2Measurement precision
If the number of pixels is increased to achieve higher resolution, then the image quality is improved, but the horizontal period is shortened making it difficult to increase frame frequency
Solution Approach 1:
The pixel circuit is designed with dynamic voltage addition capability that can operate at various frame frequencies. The first circuit dynamically combines voltages during the horizontal period, and the second circuit dynamically retains and applies the resulting voltage, enabling the system to adapt to shorter horizontal periods required for high-resolution displays while maintaining high frame frequencies.
3Illumination intensity
If the aperture ratio is increased to improve display quality, then the luminance is enhanced, but the number of components in the pixel circuit must be reduced
Solution Approach 1:
The pixel circuit achieves multi-functionality by integrating voltage addition, voltage retention, and display control into two circuits. The first circuit serves both as a voltage adder and a data processing unit, while the second circuit functions as both a retention unit and a display control unit, reducing the total component count and enabling larger aperture ratios.
4Measurement precision
If the frame frequency is increased to display moving images more smoothly, then the image quality is improved, but the horizontal period is shortened making it difficult to achieve
Solution Approach 1:
The first circuit performs preliminary voltage addition during the horizontal period, combining the source driver output voltage with an additional voltage to generate the third voltage before the display phase. This preliminary action ensures that all voltage processing is completed within the shortened horizontal period, enabling smooth moving image display at high frame frequencies.
Data Source
AI summary
A display device capable of improving image quality is provided. A display device includes a plurality of pixel blocks in a display region. The pixel blocks each include a first circuit and a plurality of second circuits. The first circuit has a function of adding a plurality of pieces of data supplied from a source driver. The second circuit includes a display element and has a function of performing display in accordance with the added data. One pixel has a configuration including one second circuit and an component of the first circuit that is shared. When the first circuit is shared by a plurality of pixels, the aperture ratio can be increased.