1. What the rating actually tests
An IP code is defined in IEC 60529. It tests two things only: ingress of solid particles and ingress of water. It says nothing about heat, impact resistance, corrosion, UV stability or how long the seals last.
The first digit is solids. A 5 means dust-protected, where limited ingress is allowed but must not interfere with operation. A 6 means dust-tight, with no ingress at all.
The second digit is water. A 5 covers low-pressure jets, tested with a 6.3 mm nozzle. A 6 covers powerful jets, tested with a 12.5 mm nozzle at roughly eight times the flow rate.
So IP66 is not twice the rating of IP65. Both are dust-tight in this comparison. The difference is a stricter water test, and that is the only difference.
2. Where each rating is enough
Choose by exposure and cleaning method. A covered walkway that only sees wind-blown rain does not need IP66, and paying for it there is budget spent on a test nobody will run.
IP65 suits entrances under an awning, covered walkways and semi-outdoor areas, where the unit is cleaned by hand.
IP66 suits fully exposed sites, roadside and transport locations, coastal positions, and anywhere cleaned with a pressure hose.
The failure mode is worth naming. A unit rated for low-pressure jets usually fails at the cable gland or the door seal rather than through the glass, and it fails the first time a contractor pressure-washes it.
3. Brightness is a separate decision
A dust-tight enclosure is still unreadable at noon if the panel is too dim. Match brightness to the sun the screen actually faces, not to the number on the brochure.
Allow 1500 to 2500 nits for shaded or covered outdoor positions. Budget 2500 to 4000 nits where the screen takes direct sun for part of the day, and 4000 to 5000 nits for full-day direct sun.
Specify automatic dimming with the high-brightness options. Without it, a 5000 nit panel is painful to walk past after dark and wastes power all night.
Our outdoor range runs 32 to 86 inches from 1500 to 5000 nits with active thermal management. Current models are on the outdoor IP66 display line.
4. Heat, glass and service access
Sealing a display against water also seals heat in. Active thermal management, meaning heating and cooling that holds the panel inside its operating window, is what keeps a sealed unit alive through seasonal extremes.
Glass matters for two reasons. Anti-vandal tempered glass with optical bonding removes the internal air gap, which cuts reflection and stops condensation forming behind the cover.
Then there is servicing. A sealed wall needs a maintenance plan: seal and filter checks, and a way to reach the media player without breaking the enclosure. Ask how the unit is opened before you buy it, not after it fails.
If the screen sits behind shopfront glass rather than outdoors, the constraints change. Brightness and reflection move to the front of the list and the IP rating drops off it. See the high-brightness window display line for that case.
5. What to put in the RFQ
Send these four things and you will get quotes you can actually compare against each other.
- Exposure. Fully exposed, under an awning, or behind glass. This sets the IP rating.
- Sun. Orientation and hours of direct sun per day. This sets the nit target.
- Cleaning method. Hose-down forces IP66. A cloth wipe does not.
- Size, quantity and destination market. The last one decides which compliance files you need.
For mobile or battery-powered outdoor deployments the trade-offs shift again, because runtime replaces mains power as the binding constraint. The portable battery signage line covers that scenario.
IP65 against IP66
| Rating | Dust | Water test | Typical sites | Specify when |
| IP65 | Dust-tight (6) | Low-pressure jets, 6.3 mm nozzle | Covered walkways, awning entrances, semi-outdoor | Rain exposure only, hand cleaned |
| IP66 | Dust-tight (6) | Powerful jets, 12.5 mm nozzle | Fully exposed, roadside, coastal, wash-down areas | Pressure washing or full exposure |
Frequently Asked Questions
Is IP66 always better than IP65 for outdoor displays?
No. Both ratings are dust-tight in this comparison. IP66 adds a stricter high-pressure water test. For a covered position that is cleaned by hand, IP65 is normally enough and costs less. Specify IP66 for fully exposed sites or where the unit will be pressure washed.
What does the first digit in an IP rating mean?
It rates protection against solid particles under IEC 60529. A 5 means dust-protected, where limited ingress is allowed but must not interfere with operation. A 6 means dust-tight, with no ingress at all.
Does an IP rating cover impact resistance?
No. IEC 60529 covers dust and water only. Impact resistance is rated separately using IK codes under IEC 62262. Ask for the IK rating as well if the screen goes into a public or unsupervised location.
How bright does an outdoor display need to be?
Match brightness to exposure. Allow 1500 to 2500 nits for shaded or covered positions, 2500 to 4000 nits for partial direct sun, and 4000 to 5000 nits for full-day direct sun. Pair the higher figures with automatic dimming.
Does a sealed enclosure cause overheating?
It can. Sealing against water traps heat, so outdoor units need active thermal management with both heating and cooling. Check the thermal design and the stated operating temperature range, not just the IP code.
What should I send to get an outdoor display quote?
Send the exposure condition, orientation and hours of direct sun, cleaning method, size, quantity and destination market. We confirm the model, brightness option, MOQ, lead time and the compliance files needed for that market.
Specifying an outdoor screen? TZD Display builds 32 to 86 inch IP66 outdoor displays from 1500 to 5000 nits with active thermal management, supplied as OEM/ODM. Request a quote