OLED Row Drive Selection for Local Screen Refresh
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Solution Overview
Problem
Current OLED display technologies suffer from high power consumption and long delays due to global refreshing of the entire screen, which is inefficient and cannot accommodate split-screen scenarios effectively.
Innovation Solution
A screen drive circuit with a drive selection circuit that selectively refreshes only the pixel rows that require updates, based on the content change, using a row address selection signal to mask or output row drive signals, reducing unnecessary refreshing and optimizing power consumption and delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional organic light-emitting material is used, then the display can be manufactured with standard materials, but the luminance is insufficient and the viewing angle is narrow
Solution Approach 1:
The patent uses a composite emission mechanism combining conventional organic light-emitting materials with phosphor materials. The phosphor layer converts part of the blue light from the organic emitter to green light through photoluminescence, creating a composite color output that achieves both high luminance and wide viewing angle characteristics.
Solution Approach 2:
The patent changes the emission parameters by introducing a phosphor with specific characteristics (blue excitation, green emission) to modify the color and intensity distribution. This parameter change enables the display to achieve wide viewing angles and high luminance simultaneously by controlling the phosphor's emission properties.
2Illumination intensity
If the light-emitting material is replaced with inorganic light-emitting material, then the viewing angle and luminance are improved, but the manufacturing complexity increases due to vacuum deposition requirements
Solution Approach 1:
The patent segments the light-emitting function into two independent parts: a conventional organic light-emitting layer that can be manufactured with standard processes, and a phosphor conversion layer that enhances the light output. This segmentation allows each layer to be optimized independently, maintaining manufacturing simplicity while achieving superior performance.
Solution Approach 2:
The phosphor material acts as an intermediary between the organic light-emitting material and the final light output. It receives blue light from the organic emitter and converts it to green light, mediating the interaction between the two materials to achieve both wide viewing angle and high luminance without requiring complex vacuum deposition processes.
3Illumination intensity
If the light-emitting material is replaced with inorganic light-emitting material, then the viewing angle and luminance are improved, but the manufacturing cost increases
Solution Approach 1:
The patent employs conventional organic light-emitting materials that are cost-effective and easily manufactured, rather than using expensive inorganic light-emitting materials. The organic emitter serves as a disposable, low-cost component that can be produced with standard manufacturing processes, significantly reducing production costs while maintaining acceptable performance when combined with the phosphor layer.
4Device complexity
If a conventional organic light-emitting material is used, then the manufacturing process is simple, but the color stability and viewing angle are insufficient
Solution Approach 1:
The patent creates a composite light-emitting system where the organic emitter produces blue light and the phosphor converts it to green light. This composite structure achieves color stability and wide viewing angle by combining the advantages of both materials: the organic emitter provides simple manufacturing and high efficiency, while the phosphor provides color stability and wide viewing angle characteristics.
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
This approach reduces power consumption and delay in OLED displays by selectively refreshing only the necessary pixel rows, allowing for dynamic partitioning of the display and supporting split-screen scenarios.
Implementation Method 1
a first organic light-emitting material which emits blue light when electric current passes therethrough
Implementation Method 2
a phosphor material having a blue light emission peak wavelength of 450 nm or less and a green light emission peak wavelength of 520 nm or more
Data Source
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AI summary
This application provides a screen drive circuit, a display, and an electronic device. An input terminal of a drive selection circuit in the screen drive circuit inputs a row drive signal, and a control terminal of the drive selection circuit inputs a row address selection signal. The drive selection circuit outputs, based on the row address selection signal, the row drive signal corresponding to a pixel row whose displayed content changes. The row address selection signal is generated, by a display drive chip connected to the display, based on the pixel row whose displayed content changes. It can be learned that, the screen drive circuit can separately select, based on an update frequency of displayed content on the display, some pixel rows in a pixel array for content refreshing, in other words, refresh, by using the drive selection circuit, displayed content in a region whose content is to be updated, without refreshing displayed content in a picture holding region, thereby implementing local refreshing based on the displayed content.