For macOS, a high-resolution screen can bring delicate display effects and enhance the viewing experience. At the same time, Apple's new laptops are equipped with USB-C interface, support USB-C interface charging, and support video output. Corresponding to the display connected to the USB-C interface, it can not only transmit video, but also charge the notebook, which is very convenient to expand and use.
The charging head network got the motherboard of the LG UltraFine 27-inch 5K monitor, which has an ultra-high resolution of 5120* 2880, and the resolution is 4 times that of the 2K screen. The display supports DCI P3 color gamut, supports 500 nits brightness, built-in camera, and speakers.
LG UltraFine 27 inch 5K rear cover is equipped with four USB-C interfaces, near the power socket USB-C interface is the Thunderbolt 3 interface, and supports 94W output power, can charge the notebook. Three USB-C interfaces near the edge, you can connect the USB HUB to connect other peripherals, the base supports tilting and lifting, which can be said to be tailor-made for Apple computers.
At present, the price of this monitor in Jingdong is as high as 9948 yuan, and the simple and low-key design is seriously inconsistent with the price, which also highlights the essence of the iMac is to buy a computer and send a screen. But for professional workers, only such a display can meet their demanding requirements.
Let's take a look at how LG's monitor is designed inside.
The internal control board of the LG Ultrafine 27 5K features a green PCB with double-sided soldered elements.
On the other side are the lightning interface, USB-C interface, screen, camera, backlight module and light sensor interface, and the front chip and the metal shell thermal pad contact heat dissipation.
On the back of the motherboard, there are power input connectors, speaker connectors, screen backlight interfaces, fans and temperature detection interfaces.
The four USB masters are welded vertically to the board, and in fact, the topmost Thunderbolt 3 matrix for video input has broken, and it is precisely because it is broken that there is a chance to meet with everyone.
In addition to one Thunderbolt 3 interface, the remaining three are USB-C expansion interfaces.
Let's start with the power input interface.
This two-pin outlet is the power input connector, which connects to the built-in power supply of the monitor.
Filter capacitance on the input side of the power supply, from Sanying, 68μF 35V.
The screen cable interface of the display control board, through which it is connected to the screen, outputs the video signal and the screen power supply, using a 60-pin connector.
On one side of the cable connector are hidden leds and buttons.
The display lightning chip adopts aluminum foil and graphite thermal guide shielding and heat dissipation to avoid signal interference.
Tearing off the thermal shielding material covering, this display uses Intel JHL6540 for DP video signal output and data transmission. JHL6540 supports two Thunderbolt interfaces, pcIe 3*4 data transmission and DP1.2 video transmission, and supports USB3.1 Gen2 data transmission.
The JHL6540 has a TDK SPM6530 0.68μH inductor for internal power supply.
The JHL6540's PCIe interface is connected to Fresco Logic's PCIe-to-USB3.0 converter FL1100, which supports PCIe3.0 conversion to USB3.0.
FL1100 external serial memory from STMicroelectronics, Model 24C16, capacity 2KB for storing configuration information.
FL1100 external clock crystal, 12.000MHz, passive crystal.
The FL1100 external power supply switch, TI TPS22965, supports 6A current, built-in 16mΩ switch, and turns off the conversion chip when connected to a lightning interface that does not support data transmission, thereby reducing power consumption.
The FL1100's USB3.0 interface is connected to the Chuangwei GL3523 four-port hub chip, which is used for connecting peripherals with three USB-C interfaces and connecting to another USB HUB chip.
GL3523 external clock crystal.
Another USB HUB chip, from TI, TUSB8041 USB3.1 hub chip, is used to connect the camera.
TUSB8041 external clock crystal oscillator, 24.000MHz, using passive crystal oscillator.
Close-up of the interface to connect peripherals such as cameras.
The USB PD controller TPS65983 from TI, with built-in power switch and high-speed multiplexer for USB PD power supply control, is a complete USB PD solution.
TPS65983 External power supply switching MOS tube, from AOS, AON7200, uses two to prevent current backflow.
Two 10mΩ resistors are connected in parallel for current sensing.
After introducing the relevant lightning interface and data path, the following enters the main circuit of the display.
The display screen driver chip is Realtek RTD2799, which is a controller that supports 5K resolution or 4K120Hz high-brush display, supports RGB input interface, supports HDMI2.0 input interface.
The chip integrates MCU, audio decoder and other functions, and is a very competitive product in 5K ultra-high-definition display and 4K high-brush display.
RTD2799 external two Samsung K4B1G1646G-BCNB 1Gb DDR3 memory, two to form a 256MB capacity.
MX25L8035E, 16MB of memory for display firmware information.
AT24C32D memory, 32KB capacity, for storing configuration information.
RTD2799 external clock crystal.
RICHTEK RT8289 Switching Buck Converter supports 32V voltage input, 5A output current, built-in 100mΩ conductive switch transistor, external Schottky diode for output freewheeling, and fixed switching frequency of 500kHz.
DIODES B540C 40V5A Schottky diode for switching buck output freewheeling.
Close-up of the magnetic rubber buck inductor on the back of the circuit board, a total of two RT8289 step-down circuits.
The front of the motherboard is mainly for lightning and data circuits, as well as the display screen driver part, and the back of the motherboard is the audio decoding, speaker power amplifier, whole machine control and backlight drive part.
NXP LPC11U68J Entry-level 32-bit M0+ processor with 256KB of flash memory and 36KB of SRAM, 4KB E2PROM, USB support, and 12-bit ADC.
Silk screen printed 7BD 73Y chip.
A dual buck circuit that outputs different voltages to power the chip on the main board.
The MPS MP2122 dual synchronous buck converter supports 6V input voltage with 2A output current.
TI TPS22965 load switch, support 6A current, built-in 16mΩ switch.
TI LP8860 LED backlight driver with built-in boost control and 4-channel LED driver for display LED backlight driver. Each channel supports 150mA current, supporting PWM, I2C and SPI for dimming control.
AOD2922 boost MOS tube.
25mΩ current sampling resistor.
Inductor for backlight boost.
Backlight boost filter capacitor, Korean Sanying, 80V27μF, two in parallel.
Realtek ALC4020 audio decoder for display audio signal conversion.
Neofidelity NTP7515D digital amplifier for built-in speaker drivers in the display.
Output filter inductance with built-in digital amplifier.
Speaker output connector.
MpS MP2315 synchronous buck converter supports 24V input voltage and 3A output current.
A RT8289 buck circuit on the back of the motherboard.
B540C Schottky diode.
Another MP2122 dual buck chip.
IDT5V61065PGG PCIe clock synthesizer from Renesas with two output ports.
Silk screen printing of 4G02 memory.
The monitor has a built-in cooling fan connector.
Built-in temperature sensing thermistor interface.
Charging head net summary
LG UltraFine 5K display is a built-in Thunderbolt 3 interface display, high resolution and P3 color gamut blessing, equivalent to the display content of 4 2K displays, thus giving it a strong competitiveness, becoming the main display of many content workers.
The display internally uses Intel JHL6540 for video signal output, and uses Realtek RTD2799 for screen driver, and uses The Wise FL1100 internally to achieve PCIe to USB3.0 conversion, and uses two hub chips for corresponding interface expansion. The internal audio output uses Realtek ALC4020 and NTP7515 for audio decoding and amplification.
Corresponding to the chip power supply, LG uses a large number of MPS and dictum buck converters in the display to supply power to different chips on the main board. Electrolytic capacitors use the Korean Sanying brand and have a mature design. The 5K resolution and USB-C fast charging support make it an ideal companion for laptops.