Short answer: SMD screen refresh rate is the number of times per second an SMD screen redraws its picture, measured in Hz. Your eyes cannot see flicker at 1920Hz or 3840Hz, but a camera can. A 1920Hz screen may show dark bands on a phone or video camera. A 3840Hz refresh rate is the safer minimum for any screen that will be filmed.
This matters most for weddings, concerts, launches and studios, where everyone films the screen. For example, the Absen NT V2 indoor rental panels run at 7680Hz for exactly this reason. Below, we explain what each number means and which one you need.
What is SMD screen refresh rate?
An SMD screen does not glow steadily. The driver chips switch every LED on and off very fast to build the picture and control brightness. One full redraw is one refresh cycle.
Refresh rate counts those cycles per second. At 3840Hz, the screen redraws 3,840 times every second. A higher number means shorter gaps between cycles, so the light looks more even to a camera.
- 1920Hz: common on budget and older screens. Fine for eyes, weaker on camera.
- 3840Hz: a good level for events and halls where phones and cameras are used.
- 7680Hz and above: used for studios, broadcast and virtual production.
Is refresh rate the same as frame rate, scan rate or grey scale?
No. These four terms often get mixed up on spec sheets. Each one controls something different.
| Term | What it means | Unit | What it affects |
| Refresh rate | How often the LEDs are redrawn each second | Hz | Flicker on camera |
| Frame rate | How many video frames your content plays per second | fps | Motion in the video |
| Scan rate | How many rows of LEDs are lit at one moment, such as 1/16 or 1/32 scan | ratio | Brightness, cost, camera stability |
| Grey scale | How many brightness steps each colour has, such as 14-bit or 16-bit | bit | Smooth gradients, dark scenes |
A 16-bit grey scale gives 65,536 brightness steps per colour. A 14-bit screen gives 16,384. More steps mean smoother skin tones and fewer visible steps in dark areas.
Scan rate works differently. In a 1/32 scan screen, only one 32nd of the rows is lit at a time. It uses fewer driver chips, so it costs less, but each LED is lit for a smaller share of time. A lower scan ratio, such as 1/16, usually gives more even light. Always read refresh rate, grey scale and scan rate together.
Why do SMD screens flicker on camera?
Your eye blends all the refresh cycles into one steady image. A camera does not. It opens its shutter for a very short time and captures only the cycles that happen inside that window.
Here is what goes wrong:
- The camera shutter opens for a short time, for example 1/500 of a second.
- The screen is mid-cycle when the shutter opens or closes, so the camera catches only part of a cycle.
- Most phones scan the picture row by row. Each row catches a slightly different amount of light.
- The result is dark bands, rolling lines or uneven brightness. This is flicker on camera.
The fix is more cycles inside every exposure. The table shows how many refresh cycles fit inside common shutter speeds.
| Shutter speed | 1920Hz | 3840Hz | 7680Hz |
| 1/50 s (normal video) | 38 cycles | 77 cycles | 154 cycles |
| 1/100 s | 19 cycles | 38 cycles | 77 cycles |
| 1/250 s | 8 cycles | 15 cycles | 31 cycles |
| 1/500 s (bright stage, slow motion) | 3.8 cycles | 7.7 cycles | 15 cycles |
| 1/1000 s | 1.9 cycles | 3.8 cycles | 7.7 cycles |
| 1/2000 s | 0.96 cycles | 1.9 cycles | 3.8 cycles |
As a rough rule, the worst brightness difference between rows is about 1 divided by the number of cycles. At 1/1000 s, that is around 50% for a 1920Hz screen, 26% for 3840Hz and 13% for 7680Hz. Dark and grey areas show it first, because their pulses are the shortest.
Phones choose shutter speed on their own. Under bright stage light they often pick fast speeds, and slow-motion mode uses fast speeds too. That is why a screen that looks fine in normal video can show bands in a photo or a slow-motion clip.
1920Hz vs 3840Hz: what is the real difference?
Both numbers look the same to a person in the room. The difference only shows up on a lens.
| 1920Hz | 3840Hz | |
| Looks to the eye | Steady | Steady |
| Phone video, normal speed | Usually fine, sometimes faint bands | Clean in most cases |
| Phone photo, fast shutter | Bands can appear | Much less likely |
| Slow-motion video | Bands are common | Safer, but test first |
| Pro camera, live feed | Not recommended | Acceptable for most events |
| Best for | Lobbies, billboards, signage | Halls, stages, events, livestreams |
A 3840Hz refresh rate doubles the cycles in every exposure. It does not remove flicker in every case, because camera settings and grey scale also matter. But it moves the screen into the zone where most phones and event cameras give a clean picture.
Which SMD screen refresh rate do you need?
Match the refresh rate to how people will film the screen. If nobody will film it, 1920Hz is enough. If anybody might, choose 3840Hz or more.
| Where the screen is used | Minimum | Better choice |
| Lobby or showroom, seen by eye only | 1920Hz | 3840Hz |
| Roadside billboard | 1920Hz | 1920Hz or more |
| Wedding hall or marquee with photographers and phones | 3840Hz | 7680Hz |
| Concert stage with a camera feed on the screen | 3840Hz | 7680Hz |
| Corporate launch with a livestream | 3840Hz | 7680Hz |
| TV studio, xR or virtual production | 7680Hz | 7680Hz or more, with camera sync |
These are our starting points, not fixed rules. Test with your own camera when you can.
Planning a show? Read our guide on the stage SMD screen for concerts. For marriage halls, see SMD screens for wedding halls and marquees. Pixel pitch also matters on camera, so check the pixel pitch guide too.
Why a high Hz number is not enough
Some sellers print a big refresh rate and say nothing else. Ask three more questions before you buy.
- What is the grey scale? A high refresh rate with a low grey scale gives a smooth flicker-free screen with rough gradients. Look for 14-bit or 16-bit.
- What is the scan rate? Check whether it is static, 1/16 or 1/32. The scan rate changes brightness and how steady the screen looks on camera.
- Is the refresh rate the same at low brightness? Indoor screens are often run dim. Ask for a demo at the brightness you will actually use.
Our NT V2 Indoor panels list a 7680Hz refresh rate with 16-bit grey scale and come in 1.9 mm, 2.6 mm and 2.9 mm pixel pitch, as per Absen’s official specifications.
How to test a screen for flicker on camera before you buy
A five-minute test with your own phone tells you more than a spec sheet.
- Ask for the refresh rate, grey scale and scan rate in writing.
- Film the screen with your phone in normal video mode.
- Take a few photos and one slow-motion clip.
- Show a dark scene and a grey gradient, not just a bright video. Bands show up there first.
- If you will use a pro camera or a livestream, test with that camera.
You can see Absen screens live at our experience centre in Islamabad, or contact the Absen Pakistan team to arrange a demo.
How to reduce flicker when you film an SMD screen
If the screen is already installed, these camera settings help:
- Lower the shutter speed. For video, use a shutter of 1/(2 x frame rate). That is 1/50 s at 25 fps.
- Do not use very fast shutters for photos of the screen. Try 1/100 s or slower.
- Lock the exposure. Auto exposure keeps changing the shutter and brings the bands back.
- Change the angle a little. This helps with moire, the wavy pattern from the pixel grid. It is a different problem from flicker, but it often appears with it.
- Use camera sync on broadcast and xR sets, so the camera and the screen run on the same timing.
Frequently asked questions
What is a good SMD screen refresh rate?
For screens that people only look at, 1920Hz is enough. For screens that will be filmed, choose 3840Hz or higher. Studios and broadcast work usually need 7680Hz.
Is 3840Hz better than 1920Hz?
Yes, for camera use. A 3840Hz refresh rate gives twice as many refresh cycles in each exposure, so bands are much less likely. To the human eye, both look the same.
Why does my SMD screen flicker on a phone camera?
The phone shutter catches only part of a refresh cycle, and it reads the picture row by row. Rows get different amounts of light, which shows as dark bands. A higher refresh rate and a slower shutter reduce it.
Is refresh rate the same as frame rate?
No. Refresh rate is how often the LEDs redraw each second, in Hz. Frame rate is how many video frames your content shows each second, in fps.
Do I need 3840Hz for a wedding hall?
If guests and photographers will film the stage screen, yes. It is the safer choice. If the screen only shows a static logo and nobody films it, 1920Hz can work.
Does a higher refresh rate cost more?
Usually yes, because it needs better driver chips. The cost gap is often small next to the cost of a screen that looks bad in every wedding video.