MonitorsComputer Monitor
LG 40WT95UF- Monitor Manual
Setup, everyday use, maintenance and troubleshooting for the 39.7 in. 5K2K ultrawide curved IPS-type monitor, with verified specifications.
- Screen39.7 in.
- Resolution5K2K ultrawide
- On-mode power43.6 W
- Est. yearly cost$23.29
About the LG 40WT95UF-
LG model 40WT95UF- is a 39.7 in. 5K2K ultrawide curved IPS-type monitor that meets ENERGY STAR display efficiency requirements. Its native resolution is 5120 × 2160 pixels (5K2K ultrawide), about 140 pixels per inch.
It uses an IPS LCD panel with a rated maximum luminance of 450 cd/m² (nits). Listed signal and data interfaces include Thunderbolt. A USB-C port with Power Delivery can charge a connected laptop at up to 96 W while carrying video and data.
Measured on-mode power is 43.6 W, with 0.6 W in sleep and a total energy consumption (TEC) rating of 137 kWh per year — 13% below the ENERGY STAR limit for a display of this size and resolution.
Specifications
| Brand | LG |
|---|---|
| Model number | 40WT95UF-# |
| Display type | Computer Monitor |
| Screen size (diagonal) | 39.7 in. |
| Screen area | 565 sq. in. |
| Panel technology | IPS LCD |
| Native resolution | 5120 × 2160 |
| Resolution class | 5K2K ultrawide |
| Pixel density | 140 ppi |
| Maximum luminance | 450 cd/m² |
| Rated contrast ratio | 2,000:1 |
| Color spaces supported | DCI-P3 |
| Enhanced Performance Display | No |
| Signal and data interfaces | Thunderbolt |
| USB-C with Power Delivery | Yes |
| Maximum USB-C charging power | 96 W |
| Curved screen | Yes |
| Power source | Internal AC power supply |
| On-mode power | 43.6 W |
| Sleep-mode power | 0.60 W |
| Off-mode power | 0.21 W |
| Total energy consumption (TEC) | 137.0 kWh/yr |
| ENERGY STAR TEC limit | 156.6 kWh/yr |
| Below ENERGY STAR limit | 13% |
| 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 39.7 in. screen about 30–40 in. (75–100 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. For a curved screen, sit near the center of the curve so the edges are equally distant.
- Assemble the stand
Attach the stand or monitor arm while the display is lying face-down on the protective packaging or a soft cloth. Do not press on the screen.
- Connect the video cable
USB-C is the simplest option with a laptop: one cable carries video, USB data and up to 96 W charging power. If your laptop's own charger is rated higher than 96 W, it may charge slowly under heavy load — keep its adapter handy. The Thunderbolt connection can carry video, data and daisy-chained devices from compatible computers.
- Set resolution and scaling
In your operating system's display settings, select the native resolution of 5120 × 2160. At about 140 pixels per inch, a scaling setting around 150% 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 450 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. The certification record lists DCI-P3 color space support; use the matching mode (for example sRGB for web and office work) when color accuracy matters. 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 0.6 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 0.21 W.
USB-C charging and docking
With a USB-C laptop connected, the monitor supplies up to 96 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.
Features
- USB-C Power Delivery
- Single-cable video, data and laptop charging (up to 96 W).
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. Never spray liquid directly on the screen or use ammonia- or alcohol-based glass cleaners on anti-glare coatings. |
| 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 5120 × 2160 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 96 W; use the supplied or a 5 A certified cable; try another USB-C port on the laptop. |
Energy use and running costs
The LG 40WT95UF- has a total energy consumption (TEC) rating of 137 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 $23.29 per year.
| Daily use | Energy per year | Cost per year |
|---|---|---|
| 4 hours on, 20 asleep | 68 kWh | $11.56 |
| 8 hours on, 16 asleep | 131 kWh | $22.22 |
| 12 hours on, 12 asleep | 193 kWh | $32.89 |
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 LG 40WT95UF-?
It has a 39.7 in. screen with a native resolution of 5120 × 2160 (5K2K ultrawide), giving a pixel density of about 140 ppi.
How much power does the LG 40WT95UF- use?
It draws 43.6 W when on and 0.6 W in sleep. Its ENERGY STAR TEC rating is about 137 kWh a year, or $23.29 at $0.17/kWh.
Can the LG 40WT95UF- charge a laptop over USB-C?
Yes. It has a USB-C port with Power Delivery rated at up to 96 W, so a compatible laptop can charge, send video and use the monitor's USB ports over one cable.
What inputs does the LG 40WT95UF- have?
The ENERGY STAR record lists Thunderbolt. 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 LG 40WT95UF- use?
It uses an IPS LCD panel with a rated maximum luminance of 450 cd/m². IPS-type panels offer wide viewing angles and consistent color.
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 April 9, 2025), 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 LG. Always follow the safety instructions, installation requirements and warranty terms supplied with your unit, and contact LG 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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