MonitorsComputer Monitor
Lenovo D24140QX0 Monitor Manual
Setup, everyday use, maintenance and troubleshooting for the 14 in. IPS-type portable monitor, with verified specifications.
- Screen14 in.
- Resolution2240 × 1400
- On-mode power6.57 W
- Est. yearly cost$3.76
About the Lenovo D24140QX0
This guide covers the Lenovo D24140QX0, a 14 in. IPS-type portable monitor listed as ENERGY STAR certified. Its native resolution is 2240 × 1400 pixels, about 189 pixels per inch.
It uses an IPS LCD panel with a rated maximum luminance of 300 cd/m² (nits). Listed signal and data interfaces include USB. USB-C Power Delivery is listed (up to 65 W); on a bus-powered portable monitor this typically allows a USB-C adapter connected to the monitor to pass power through to the laptop. Other listed equipment includes a touch screen.
Measured on-mode power is 6.57 W, with 0.35 W in sleep and a total energy consumption (TEC) rating of 22.1 kWh per year — 18% below the ENERGY STAR limit for a display of this size and resolution. That TEC rating is lower than 96% of the 1,472 Computer Monitor models in our database.
Specifications
| Brand | Lenovo |
|---|---|
| Model number | D24140QX0 |
| Model name / series | M14t Gen2 |
| Display type | Computer Monitor |
| Screen size (diagonal) | 14.0 in. |
| Screen area | 88.1 sq. in. |
| Panel technology | IPS LCD |
| Native resolution | 2240 × 1400 |
| Pixel density | 189 ppi |
| Maximum luminance | 300 cd/m² |
| Rated contrast ratio | 1,500:1 |
| Enhanced Performance Display | No |
| Signal and data interfaces | USB |
| USB-C with Power Delivery | Yes |
| Maximum USB-C charging power | 65 W |
| Touch screen | Yes |
| Power source | USB bus power |
| On-mode power | 6.6 W |
| Sleep-mode power | 0.35 W |
| Off-mode power | 0.25 W |
| Total energy consumption (TEC) | 22.1 kWh/yr |
| ENERGY STAR TEC limit | 27.2 kWh/yr |
| Below ENERGY STAR limit | 18% |
| ENERGY STAR Most Efficient | No |
Safety information
- Place the monitor on a stable, level surface. When using a monitor arm or wall mount, choose one rated for the monitor's weight and VESA pattern and tighten it as instructed.
- Connect the display to a properly grounded outlet with the supplied power cord. Do not use a damaged cord, and do not route it under rugs or through doorways.
- Keep the ventilation openings clear and do not place the display near radiators, heaters or in direct sunlight.
- Do not expose the display to rain, moisture or spilled liquids. If liquid gets inside, unplug it immediately and have it checked before further use.
- Unplug the display during lightning storms or when it will be unused for an extended period.
- Keep fingers clear of the hinge and height-adjustment mechanism when tilting, pivoting or raising the screen.
Setup
Position the 14 in. screen about 20–30 in. (50–75 cm) from your eyes, directly in front of you, with the top line of text at or slightly below eye level. Tilt it back 10–20° and place it at a right angle to windows to minimize glare.
- Unfold the stand
Open the folding cover or kickstand and stand the monitor on a flat surface next to your laptop. Do not rest it on soft surfaces that block airflow.
- Power and connect
This model is powered over USB. Connect it to a laptop USB-C port that supports video output (DisplayPort Alternate Mode); if the laptop cannot supply enough power, connect a USB-C power adapter to the monitor's second USB-C port where provided.
- Set resolution and scaling
In your operating system's display settings, select the native resolution of 2240 × 1400. At about 189 pixels per inch, a scaling setting around 175% usually gives comfortably sized text; adjust to taste.
- Adjust brightness
Set brightness so a white page looks similar to a sheet of paper under your room lighting — typically 100–150 cd/m² for office work, well below this model's 300 cd/m² maximum. Lower brightness reduces both eye strain and power use.
Using your monitor
Picture modes and color
Use the on-screen display (OSD) menu to choose a picture preset. A standard or sRGB mode is best for office work and web browsing. Avoid "dynamic" contrast modes for photo editing, as they shift brightness with screen content.
Power management
The monitor enters sleep automatically when the computer stops sending a signal, dropping to 0.35 W. Set your computer to turn off the display after 5–15 minutes of inactivity so this happens during breaks. With the power button off, the monitor draws 0.25 W.
USB-C charging and docking
With a USB-C laptop connected, the monitor supplies up to 65 W through the same cable that carries the picture. Many monitors keep the USB-C port powered in sleep so the laptop continues to charge; check the OSD for a "USB charging in standby" option if you want to disable it.
Touch screen
Touch input requires a USB or USB-C data connection to the computer in addition to the video cable. Use the operating system's pen and touch settings to calibrate if touches register in the wrong place.
Features
- USB-C Power Delivery
- Single-cable video, data and laptop charging (up to 65 W).
- Touch screen
- Multi-touch input over a USB connection to the host computer.
Care and maintenance
| When | What to do |
|---|---|
| Weekly | Dust the screen with a dry microfiber cloth using light pressure. |
| When smudged | Power the display off, then wipe with a microfiber cloth lightly dampened with water. For disinfecting touch surfaces, use only the cleaners the manufacturer approves (many allow diluted isopropyl alcohol on cover glass). |
| Every 3 months | Vacuum or brush dust from the ventilation slots and check that cables are fully seated and not pulling on the ports. |
| Every 6 months | Check the manufacturer's support site for firmware updates, especially if you see compatibility issues with new computers or docks. |
Troubleshooting
Most display problems trace back to cables, input selection or computer settings. Work through these checks before contacting support; for model-specific messages, consult the manufacturer's manual.
| Problem | Possible cause | What to try |
|---|---|---|
| "No signal" message | Wrong input selected; loose cable; computer asleep or outputting to another screen. | Select the correct input in the OSD, reseat both cable ends, wake the computer, and press Win+P (Windows) or check Displays settings (macOS). |
| Text looks blurry or the picture does not fill the screen | Computer not sending the native resolution; scaling or overscan settings. | Set the resolution to 2240 × 1400 and adjust OS scaling instead; turn off overscan or "aspect" options in the OSD. |
| Flicker, dropouts or black screen at high refresh rates | Cable not rated for the bandwidth; adapter or dock limitation. | Use a certified DisplayPort or Ultra/Premium High Speed HDMI cable, connect directly without adapters, or lower the refresh rate to test. |
| Colors look washed out over HDMI | Limited RGB range sent by the computer or console. | Set the output to full RGB range in the graphics driver, or match the monitor's HDMI range setting. |
| Monitor does not wake from sleep | Deep-sleep option on the input; graphics driver issue. | Press a monitor button or reselect the input; disable deep sleep / auto-input in the OSD; update the graphics driver. |
| Laptop not charging over USB-C | Laptop needs more power than the port supplies; cable not rated for charging; USB-C port on laptop is data-only. | Check that the laptop accepts USB-C charging and needs no more than 65 W; use the supplied or a 5 A certified cable; try another USB-C port on the laptop. |
| Touch does not respond | Touch USB cable not connected; driver not loaded; input mapped to the wrong screen. | Connect the touch USB cable to the same computer as the video, restart it, and recalibrate touch in the OS settings. |
Energy use and running costs
The Lenovo D24140QX0 has a total energy consumption (TEC) rating of 22.1 kWh per year. ENERGY STAR's TEC method assumes the screen is on about 35% of the time (roughly 8.4 hours a day) and asleep the rest. At $0.17 per kWh, it costs about $3.76 per year.
| Daily use | Energy per year | Cost per year |
|---|---|---|
| 4 hours on, 20 asleep | 12.1 kWh | $2.07 |
| 8 hours on, 16 asleep | 21.2 kWh | $3.61 |
| 12 hours on, 12 asleep | 30.3 kWh | $5.15 |
On-mode power is measured at the factory-default brightness. Turning brightness up or charging a laptop through USB-C increases consumption; using short sleep timers reduces it.
Frequently asked questions
What size and resolution is the Lenovo D24140QX0?
It has a 14 in. screen with a native resolution of 2240 × 1400, giving a pixel density of about 189 ppi.
How much power does the Lenovo D24140QX0 use?
It draws 6.57 W when on and 0.35 W in sleep. Its ENERGY STAR TEC rating is about 22.1 kWh a year, or $3.76 at $0.17/kWh.
Can the Lenovo D24140QX0 charge a laptop over USB-C?
Yes. It has a USB-C port with Power Delivery rated at up to 65 W, so a compatible laptop can charge, send video and use the monitor's USB ports over one cable.
What inputs does the Lenovo D24140QX0 have?
The ENERGY STAR record lists USB. Port counts and versions (for example HDMI 2.1 or DisplayPort 1.4) are not included in the certification data; check the manufacturer's specifications.
What panel type does the Lenovo D24140QX0 use?
It uses an IPS LCD panel with a rated maximum luminance of 300 cd/m². IPS-type panels offer wide viewing angles and consistent color.
Is the Lenovo D24140QX0 a touch screen?
Yes. Touch is listed as a model feature; it requires a USB data connection to the host computer.
Sources and disclaimer
Specifications on this page come from the ENERGY STAR certified monitors dataset published by the U.S. Environmental Protection Agency (record certified March 7, 2024), retrieved October 7, 2026.
The setup, operating, maintenance and troubleshooting guidance is written by ManualHarbor's editors for this specific product type and configuration. It is an independent guide — not a reproduction of the manufacturer's manual — and ManualHarbor is not affiliated with Lenovo. Always follow the safety instructions, installation requirements and warranty terms supplied with your unit, and contact Lenovo or an authorized service provider for warranty repairs and replacement parts.
Running-cost figures use assumed U.S. average utility prices and are estimates for comparison only. See our editorial methodology for details.
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