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KPPN Banjarmasin KPPN Banjarmasin Bendahara Negara · APBN

What is the pixel arrangement of a 0.7 inch 1920x1080 micro OLED?

The pixel arrangement of a 0.7 inch 1920x1080 micro OLED is a RGB striped sub-pixel layout with a full 1920x1080 active matrix driven by a CMOS backplane. Each pixel consists of three sub-pixels—red, green, and blue—arranged vertically in a stripe pattern, which is the standard for high-resolution displays because it minimizes color fringing and maximizes sharpness. The total pixel count is 2,073,600 (1920 × 1080), and the sub-pixel count is 6,220,800 (1920 × 1080 × 3). The pixel pitch is approximately 8.1 micrometers, calculated from the diagonal size of 0.7 inches (17.78 mm) and the 16:9 aspect ratio. The active area measures about 15.5 mm × 8.7 mm, giving a pixel density of 3147 pixels per inch (PPI)—far beyond what any smartphone or monitor can achieve. This extreme density is possible because micro OLEDs are fabricated on silicon wafers using standard CMOS processes, allowing sub-micron lithography for the pixel electrodes and driving circuits. The fill factor (the ratio of light-emitting area to total pixel area) is typically above 85% due to the use of a top-emitting architecture and microlens arrays, which reduce the non-emitting gaps between pixels. The RGB striped arrangement is chosen over PenTile or diamond pixel layouts because it provides better color accuracy and uniformity for high-resolution near-eye applications like AR/VR headsets, electronic viewfinders, and medical displays. The color gamut covers 100% of sRGB and typically 90% of DCI-P3, with a contrast ratio exceeding 10,000:1 because each pixel is self-emissive and can be turned off completely. The brightness reaches 3000 nits for the full white field, thanks to the high current density allowed by the silicon backplane. The pixel arrangement is not just a simple grid; it includes a common cathode layer and a patterned anode layer for each sub-pixel, with the organic layers deposited through fine metal masks (FMM) in a vacuum chamber. The CMOS backplane integrates 6T1C pixel circuits (six transistors and one capacitor per sub-pixel) to compensate for threshold voltage variations and ensure uniform luminance across the panel. The refresh rate is 60 Hz to 120 Hz depending on the driver IC, and the response time is less than 1 microsecond, which eliminates motion blur in fast-moving scenes. The pixel arrangement also supports local dimming at the pixel level, which is inherent to OLED technology, but here it is enhanced by the high-resolution backplane that can address each pixel individually. The total power consumption at 3000 nits is around 1.5 watts for the full display, but this can drop to 0.3 watts for typical content with 20% average pixel luminance. The pixel arrangement is manufactured on 8-inch or 12-inch silicon wafers, with each die being the 0.7-inch diagonal area. The yield for such a high-density display is typically 70-80% due to the tight tolerances in the organic evaporation process. The sub-pixel sizes are not equal: the green sub-pixel is usually slightly larger (about 2.8 μm × 8.1 μm) than the red and blue (2.6 μm × 8.1 μm) to balance the luminance efficiency, since green OLED materials have higher quantum efficiency. The microlens array on top of each pixel increases the light outcoupling efficiency by 30-40%, which allows the display to achieve high brightness without excessive current. The pixel arrangement also includes a black matrix between the sub-pixels to prevent optical crosstalk, which is critical for maintaining contrast in high-ambient-light environments. The viewing angle is 170 degrees in both horizontal and vertical directions, with less than 10% color shift at 60 degrees off-axis, thanks to the microcavity effect that is tuned for each color. The pixel arrangement is designed for direct-view operation, meaning the light is emitted from the top surface of the silicon die, and the substrate is transparent glass or a thin encapsulation layer. The total thickness of the pixel stack is about 5-7 micrometers, including the anode, organic layers (hole injection, hole transport, emissive, electron transport, electron injection), and cathode. The encapsulation is a thin-film barrier of alternating silicon nitride and silicon oxide layers, about 1-2 micrometers thick, to protect the organic materials from moisture and oxygen. The pixel arrangement is not flexible because it is built on a rigid silicon substrate, but it can be integrated into a curved optical system using lenses or waveguides. The 0.7 inch 1920x1080 micro oled display is typically used in applications where high resolution and small size are critical, such as in 0.7 inch 1920x1080 micro oled display modules for AR glasses, where the pixel arrangement must be free of visible artifacts at 20-30 mm eye relief. The pixel arrangement also supports binary or grayscale operation with 8-bit color depth per channel, allowing 16.7 million colors, but some high-end versions support 10-bit (1.07 billion colors) for HDR content. The driving scheme is digital PWM (pulse width modulation) at a frequency of 60-120 kHz, which avoids the flicker that can occur with analog driving at low luminance. The pixel arrangement is tested for defect density of less than 10 ppm (parts per million) for bright or dark pixels, which is achieved through redundant pixel circuits and laser repair. The thermal performance is managed by a copper heat spreader attached to the back of the silicon die, as the high brightness can generate up to 5 watts of heat per square centimeter. The pixel arrangement is also compatible with field-sequential color driving if the RGB sub-pixels are replaced with a monochrome panel and a color wheel, but that is rarely used in micro OLEDs due to the complexity. The color uniformity across the panel is within Δu'v' < 0.005, and the luminance uniformity is within 5% of the average, thanks to the precise current mirror circuits in each pixel. The pixel arrangement is designed to operate at temperatures from -40°C to +85°C, with the organic materials having a glass transition temperature above 120°C. The lifetime of the pixel arrangement is rated at 50,000 hours to half brightness for the blue sub-pixel, which is the shortest-lived, while red and green can exceed 100,000 hours. The pixel arrangement uses a common cathode to reduce the number of metal layers, and the anode is patterned with a high-reflectivity metal like aluminum or silver for the top-emitting structure. The optical cavity length for each color is tuned to maximize the emission at the desired wavelength: red at 620 nm, green at 530 nm, and blue at 460 nm, with a full width at half maximum (FWHM) of about 40 nm. The pixel arrangement supports variable refresh rate from 48 Hz to 120 Hz without tearing, thanks to the adaptive sync capability of the LVDS interface. The data rate for the LVDS interface is 4.5 Gbps for the full resolution at 60 Hz, using 4 lanes of LVDS with 8-bit color depth. The pixel arrangement is also available with MIPI DSI interface for integration with mobile processors, but the LVDS version is preferred for industrial and medical applications due to its longer cable reach. The pixel arrangement is manufactured in a class 10 cleanroom with particle counts below 10 per cubic foot, to avoid defects that could kill pixels. The contrast ratio is measured in a dark room with a luminance meter, and it exceeds 100,000:1 for a checkerboard pattern, because the black level is limited by the ambient light reflection rather than the OLED itself. The pixel arrangement includes a circular polarizer to reduce reflections, which cuts the brightness by about 50% but improves the perceived contrast in bright environments. The total weight of the display module is 2.5 grams, including the flex cable and driver IC, making it suitable for head-mounted applications. The pixel arrangement is also used in night vision systems where the near-infrared sensitivity of the OLED is minimized by a filter, but the standard version has a peak sensitivity in the visible spectrum. The pixel aperture ratio is 88% for the green sub-pixel and 85% for red and blue, due to the different sizes of the microlenses. The pixel arrangement is designed to be binocular compatible, meaning two displays can be synchronized with a phase-locked loop to avoid flicker in stereo viewing. The gamma correction is applied digitally in the timing controller, with a standard gamma of 2.2, but it can be programmed to any gamma curve from 1.0 to 3.0. The pixel arrangement supports overdrive to reduce the response time to below 0.1 ms for gray-to-gray transitions, which is important for VR applications with low persistence. The low persistence mode can be enabled by strobing the backplane at 1-2 ms per frame, which reduces motion blur but requires a higher peak brightness of 5000 nits. The pixel arrangement is also used in high-speed cameras as a viewfinder, where the global shutter capability of the CMOS backplane allows simultaneous exposure of all pixels. The global shutter is implemented by a storage capacitor in each pixel, which holds the data voltage while the OLED is driven. The pixel arrangement has a readout mode for diagnostic purposes, where the photocurrent of each pixel can be measured to detect degradation. The temperature coefficient of the pixel brightness is -0.5% per degree Celsius, which is compensated by a lookup table in the driver. The pixel arrangement is also available in a monochrome version with a single color (green or white) for higher brightness of 5000 nits, but the RGB version is the standard for full-color applications. The color temperature is adjustable from 5000K to 10000K, with a default of 6500K. The pixel arrangement uses a dithering algorithm to achieve 10-bit color depth with an 8-bit driver, by temporally modulating the sub-pixels at 240 Hz. The sub-pixel rendering is supported by the graphics driver, which can improve the perceived resolution for text by 30% by using the known position of the sub-pixels. The pixel arrangement is also used in medical imaging displays where the color accuracy must be maintained over time, and the built-in calibration system can adjust the pixel currents to compensate for aging. The aging compensation is based on a real-time measurement of the total charge passed through each pixel, and it updates the lookup table every 1000 hours. The pixel arrangement has a burn-in prevention mechanism that shifts the pixel data by a few pixels every hour to avoid static images. The electrostatic discharge (ESD) protection is integrated into the pixel circuits, with a rating of 2 kV for the human body model. The pixel arrangement is also used in military applications where the display must be readable in direct sunlight, and the 3000 nits brightness combined with the circular polarizer achieves a contrast ratio of 5:1 in 10,000 lux ambient light. The optical efficiency of the pixel arrangement is 15% for the red, 20% for the green, and 10% for the blue, due to the different quantum efficiencies of the organic materials. The power efficiency is 2 lumens per watt for the full white field, which is lower than large-area OLEDs but acceptable for the high brightness requirement. The pixel arrangement is also available with a touch sensor integrated on the cover glass, but that increases the thickness by 0.5 mm. The viewing distance for the pixel arrangement is typically 20-30 mm for AR glasses, where the pixel pitch of 8.1 μm is invisible to the human eye with 20/20 vision. The modulation transfer function (MTF) of the pixel arrangement is 80% at the Nyquist frequency of 62 cycles per mm, which is the theoretical limit for the pixel pitch. The chromatic aberration caused by the microcavity effect is less than 0.5 pixels at the edge of the field of view, which is corrected by the optical system. The pixel arrangement is also used in head-up displays for automobiles, where the brightness must be 10,000 nits for daylight readability, but the 0.7 inch version is limited to 3000 nits. The operating voltage for the pixel arrangement is 3.3 V for the logic and 5 V to 10 V for the OLED drive, depending on the brightness. The interface is LVDS with 4 data pairs and 1 clock pair, operating at 1.8 V or 3.3 V. The pixel arrangement is also available with a SPI interface for low-resolution applications, but the 1920x1080 resolution requires the high-speed LVDS. The frame memory is integrated into the driver IC, which stores one frame of data for the 6.2 million sub-pixels. The pixel arrangement is tested for vibration and shock up to 20 G, and it can withstand a drop from 1.5 meters on a concrete floor. The humidity resistance is 90% RH at 60°C for 1000 hours, with the encapsulation providing a water vapor transmission rate of less than 10^-6 g/m^2/day. The pixel arrangement is also used in space applications where the radiation tolerance is enhanced by using a silicon-on-insulator (SOI) backplane, but the standard version is not rad-hard. The cost of the pixel arrangement is dominated by the silicon wafer and the organic deposition, with a typical price of $200-300 per unit for small quantities. The lead time is 8-12 weeks for custom orders, with standard products available from stock. The pixel arrangement is also used in 3D printing where the high resolution allows for precise curing of photopolymer, but the 0.7 inch size is too small for most printers. The future development of the pixel arrangement includes the use of quantum dot color converters to replace the RGB sub-pixels with a single blue OLED and patterned quantum dots, which could increase the brightness and color gamut further. The pixel arrangement is also being scaled to 4K resolution (3840x2160) on a 1.3 inch diagonal, with a pixel pitch of 4.5 μm, but that is still in the prototype stage. The manufacturing process for the pixel arrangement uses a 0.18 μm CMOS process for the backplane, which allows for the integration of the pixel circuits and the row and column drivers on the same chip. The yield improvement is achieved by using redundant rows and columns that can be laser-repaired if a defect is found. The pixel arrangement is also used in holographic displays where the phase modulation of the light is required, but the standard version only modulates the intensity. The polarization of the emitted light is random, but it can be made circularly polarized by adding a quarter-wave plate. The pixel arrangement is also used in gesture recognition systems where the display is used as a structured light source, but that requires a special pattern of pixels. The driver IC is typically a separate chip bonded to the silicon die using chip-on-glass (COG) technology, with a pitch of 30 μm for the bonding pads. The flex cable is a 20-pin FPC with a 0.5 mm pitch, carrying the LVDS signals, power, and control lines. The pixel arrangement is also available with a HDMI interface using an external converter, but that adds latency and cost. The software support includes a Windows and Linux driver that can control the brightness and color temperature via I2C commands. The pixel arrangement is also used in machine vision systems where the high resolution and fast refresh rate are needed for inspection of small parts. The optical design for the pixel arrangement typically uses a magnifying lens with a focal length of 20-30 mm to create a virtual image at a distance of 2-3 meters. The field of view for a 0.7 inch display with a 20 mm lens is about 30 degrees, which is suitable for a small AR overlay. The pixel arrangement is also used in thermal imaging where the display is used to show the infrared image, but the color palette is mapped to the temperature. The color mapping is done in the graphics processor, which can also apply false color for different temperature ranges. The pixel arrangement is also used in night vision goggles where the green phosphor is replaced by a green OLED, but the brightness is reduced to 100