P4 · Indoor Small Pitch
P4 Indoor LED Display Collection
The absolute mainstream 4.00mm board, in its hard-board indoor build: four module formats all landing on exactly 62,500 pixels per square meter, SMD2020 lamps at 800–1,000 nits, strong-magnet front service, and the family’s lightest bill — for worship halls, auditoria and big retail spaces read from 8–15 meters.
Definition
What Is a P4 Indoor LED Display?
Short answer: A P4 indoor LED display is a fixed indoor video wall built from rigid 4.00mm-pitch boards — exactly 62,500 pixels per square meter on all four module formats — for big rooms read from 8–15 meters. SMD2020 lamps at 800–1,000 nits, strong-magnet front service, and a 1,920/3,840Hz refresh choice on the mainstream board. It is the value floor of our indoor family: the most wall per budget, with the same cabinet discipline as the finer classes.
A P4 indoor LED display is the class that proves small pitch has gone mainstream: four board formats — 320×160mm, 256×128mm, 256×256mm and the classic 160×160mm square — every one dividing the 4.00mm grid exactly, every one landing on precisely 62,500 pixels per square meter. No rounding, no naming asterisk: the brochure number, the pixel grid and the density agree across the whole collection.
Its band is the big-room middle. Inside 8 meters, the P3 indoor collection and the P2.5 collection carry finer detail; at the same viewing band on the rental platform, the P3.91 rental class serves walls that tour. The same 4mm grid also hangs outdoors on the P4 outdoor collection. Size any wall with the LED screen calculator.
The class carries one figure through all four boards: exactly 62,500 pixels per square meter. A 6×3.4m hall wall resolves 1,500×843 — honest video and lyric canvas for the back rows — at roughly a quarter of the per-square-meter cost of the 2.5mm class.
Module Options
Which Module Sizes Does a P4 Indoor LED Display Use?
Four boards — the widest format spread in the indoor family — all on one exact 4.00mm grid. Figures come from our production sheets, reviewed September 2026; every scan and IC set below reconciles to the lamp. The lamp row names SMD2020, SMD1515 or the legacy SMD2121 per board.
① 320×160mm — The Absolute Mainstream
The board the whole 4mm market standardised on: 80×40 = 3,200 dots at exactly 4.00mm, 19.5 boards per square meter, tiling the 640×640mm and 960×960mm cabinet family. The 1/20 scan drives the grid through 30 devices — reconciling exactly — and this board alone carries the refresh choice: 1,920Hz regular or 3,840Hz high-refresh for camera-facing rooms. Strong-magnet front service; SMD2020 lamps.
| Module size | 320×160mm |
| Pixel resolution | 80×40 = 3,200 dots (exact 4.00mm) |
| Scan mode | 1/20 scan |
| Driver IC brands | Chipone PWM driver family, 16-channel |
| ICs fitted (total) | 30 (1/20 scan — reconciles exactly) |
| Lamp | SMD2020 black-body |
| Brightness | 800–1,000 nits |
| Refresh | 1,920Hz standard or 3,840Hz high-refresh at order |
| Maintenance | Full front service — strong-magnet modules pull from the face |
| Cabinets · Uniformity | 640×640mm (×8 boards, 160×160 px) · 960×960mm (×18, 240×240 px) — consistency-selected lamps + system-wide per-pixel correction |
② 256×128mm — The Classic Long Board
The long-board format that legacy P4 fields standardised on: 64×32 = 2,048 dots at exactly 4.00mm, 15.3 boards per square meter, on a 1/32 scan through 12 devices — reconciling to the lamp. SMD1515 lamps give this board a finer-grain face than its size suggests. Eight boards fill a 512×512mm cabinet (128×128 pixels) and nine fill a 768×768mm (192×192). Strong-magnet front service; regular-refresh ICs as built.
| Module size | 256×128mm |
| Pixel resolution | 64×32 = 2,048 dots (exact 4.00mm) |
| Scan mode | 1/32 scan |
| Driver IC brands | Chipone PWM driver family, 16-channel |
| ICs fitted (total) | 12 (1/32 scan — reconciles exactly) |
| Lamp | SMD1515 black-body |
| Brightness | 800–1,000 nits |
| Maintenance | Full front service — strong-magnet modules |
| Cabinets · Uniformity | 512×512mm (×8 boards, 128×128 px) · 768×768mm (×9, 192×192 px) — consistency-selected lamps + system-wide per-pixel correction |
③ 256×256mm — The Classic Big Square
The big square for fewer mounting events: 64×64 = 4,096 dots at exactly 4.00mm — the densest plate in the class — four to a 512×512mm cabinet (128×128 pixels) and nine to a 768×768mm (192×192). The 1/32 scan runs through 24 devices, reconciling exactly. SMD2020 lamps; strong-magnet front service; the same consistency-selected lamp binning and system-wide correction as the whole collection.
| Module size | 256×256mm |
| Pixel resolution | 64×64 = 4,096 dots (exact 4.00mm) |
| Scan mode | 1/32 scan |
| Driver IC brands | Chipone PWM driver family, 16-channel |
| ICs fitted (total) | 24 (1/32 scan — reconciles exactly) |
| Lamp | SMD2020 black-body |
| Brightness | 800–1,000 nits |
| Maintenance | Full front service — strong-magnet modules |
| Cabinets · Uniformity | 512×512mm (×4 boards, 128×128 px) · 768×768mm (×9, 192×192 px) — consistency-selected lamps + system-wide per-pixel correction |
④ 160×160mm — The Legacy Square
The board the older P4 fields were built on: 40×40 = 1,600 dots at exactly 4.00mm, 39 boards per square meter, sixteen filling a 640×640mm cabinet (160×160 pixels) — and every one of those 256 pixels tiling an older field board-for-board. SMD2121 lamps in the classic build; 16 devices fitted per the production sheet. This is the extension-and-match board: buy it when a P4 wall must grow without changing its grid.
| Module size | 160×160mm |
| Pixel resolution | 40×40 = 1,600 dots (exact 4.00mm) |
| Scan mode | Per production sheet (legacy square) |
| Driver IC brands | Chipone PWM driver family, 16-channel |
| ICs fitted (total) | 16 (per production sheet) |
| Lamp | SMD2121 black-body (classic build) |
| Brightness | 800–1,000 nits |
| Maintenance | Full front service — strong-magnet modules |
| Cabinets · Uniformity | 640×640mm (×16 boards, 160×160 px) — consistency-selected lamps + system-wide per-pixel correction |
④ One Grid, Four Formats — Why This Class Has No Naming Trap
The finer shelves each carry a naming split — “P1.5-class” boards that measure 1.538mm, “P3” walls that measure 3.0769mm. This collection has none, because every format divides the 4.00mm grid exactly:
320×160 → 80×40
The mainstream: 19.5 boards a square meter, the 640/960mm cabinet family, and the only format with the 1,920/3,840Hz refresh choice.
256×128 · 256×256 → 64×32 / 64×64
The 512/768mm cabinet family: a long board for narrow walls and a big square for fewer mounting events, both on the 1/32 scan.
160×160 → 40×40
The legacy square on SMD2121: 39 boards a square meter, sixteen to the 640×640mm box — the board-for-board match for older P4 fields.
Every format also lands on the same 62,500 pixels per square meter, so quoting one format against another is pure cabinet-and-installation arithmetic — the picture never changes. That property is unique on the indoor ladder, and it is why this class quotes faster than any other in the family.
Watch It Built
What Does a P4 Indoor LED Display Look Like in Real Spaces?
Board & Image Quality
How Is the Picture of a P4 Indoor LED Display Actually Built?
Boards in this class ride a 1.6mm rigid fiberglass plate. With 3,200 lamps on the mainstream board the solder density is the gentlest in the indoor family, but the flatness rule holds: a plate that flexes reads as brightness ripple across an 8-meter sight line. Harness runs are pure copper on power and signal, and the lamp tier is consistency-selected before assembly — the class’s answer to uniformity at volume.
SMD2020, SMD1515, SMD2121
Three lamp builds, one per board family: SMD2020 on the mainstream and big square, SMD1515 on the long board, and the classic SMD2121 on the legacy square. All black-body — contrast near 5000:1, a 160° cone — with the lamp choice fixed per format rather than per quote.
1,920 or 3,840 Hz — a Real Choice
This board alone in the class offers both scan speeds at order time: 1,920Hz for lyric and content duty at the lighter price, 3,840Hz when cameras point at the wall. The tier is built from the driver generation and receiving card — so the order names it, rather than assuming it.
Selected Lamps, Corrected Wall
Lamps are graded for consistency before they reach the line, and the system holds whole-wall per-pixel calibration — loaded in the factory, refreshed at handover. Together they turn hundreds of boards into one canvas, and both show up as quote line items.
Encapsulation
SMD, GOB or COB — What Should the Face of a P4 Indoor LED Display Be?
At 4mm the lamps are the hardiest in the indoor family, and the face question is mostly about traffic and cleaning. All three builds ship on every board; the room picks the line:
Three questions close it:
- Does anything reach the face? — cleaning crews, luggage, stage props: GOB at minimum, COB where contact is daily.
- How close do cameras run? — the 3,840Hz option already kills flicker at any distance; only sub-2m camera passes argue for COB.
- Where are repairs made? — SMD and GOB fix at the wall in minutes; COB goes to a bench, so the spares clause carries the uptime promise.
Power
Which Power Supply Brands Does a P4 Indoor LED Display Use?
Two 5V switching-supply brands rotate through production here: Chuanglian Power and MEAN WELL. Every cabinet carries its own 5V 40A (200W) unit, so one fault dims a single box and the wall plays on. And with the fewest lamps per square meter in the indoor family, a mainstream board peaks near 4W — roughly 78W/㎡ at full white.
Brand-level power catalogs: LED display power supply hub · Mean Well guide
The bill: about 4W peak per mainstream board — near 78W/㎡ at full white — with ordinary content between 25 and 45W/㎡. Ten square meters around the clock at 35W/㎡ burns roughly 3,100 kWh a year, close to $300 on commercial rates. No indoor class runs lighter.
Control Stack
Which Control Systems Work With a P4 Indoor LED Display?
Six ecosystems connect to these boards — four control platforms plus two processor lines. Synchronous racks drive halls, auditoria and retail facades live with whole-wall correction applied; asynchronous players push schedules and signage from the cloud, which is why dual-mode boxes dominate this pitch’s lobby and hall duty. Keep one family across the wall and write the refresh tier into the order — it is produced by the driver generation and receiving card.
NovaStar
The industry benchmark — senders with current receiving cards set the whole-wall correction standard.
Best for: halls, auditoria, premium facades
Colorlight
Value per dollar — i-series receivers plus processors cover the volume board start to finish.
Best for: volume programs on a budget
Huidu
Sync and cloud-async in one enclosure — why dual-mode players dominate hall-and-lobby duty here.
Best for: worship halls, unattended walls
Mooncell
The budget challenger — networked players and processors built for fixed walls.
Best for: fixed walls on tight budgets
VDWALL
Road-worn processors — the LVP line carries wide hall canvases reliably.
Best for: broad hall canvases
RGBlink
Broadcast-adjacent switchers — cameras, NDI streams and the wall in one rack.
Best for: studios, live streams
Watch: modular indoor LED display, any shape or size
A walkthrough of modular indoor builds — the cabinet-grid logic that lets this class assemble any proportion of wall, and the magnet front service that keeps every board a face-side swap.
Hardware we fit across the six ecosystems — NovaStar sender family · Colorlight X-series selection guide · Huidu dual-mode players · Mooncell processor family · VDWALL LVP series · RGBlink switcher family
How Far Should the Nearest Viewer Sit From a P4 Indoor LED Display?
Indoors, furniture sets the floor of the viewing range. Route the space first, then the budget:
P3, P4 or P3.91 — Reading the Indoor Volume Shelf Honestly
Three names cover the volume shelf: two fixed-install classes and one rental platform a half-step finer. The honest comparison:
Three takeaways that settle it:
- Distance first — 8 meters is the honest border: inside it P3’s extra density carries the detail, past it the 4mm class reads identically to every seat.
- The wider step is area — moving from P3 to P4 funds roughly 40% more wall on the same budget, and big rooms reward area before density.
- Duty splits the near-tie — P4 and P3.91 share a viewing band; a wall that hangs buys P4’s fixed platform, a wall that tours buys P3.91’s rental cabinets.
Fine Pitch LED or LCD Video Wall — Which Should a Worship Hall Buy?
Hall and worship buyers price both, so here is the straight comparison:
The routing rule: wide lyric walls, stage backdrops and any facade that needs one unbroken image — fine pitch LED wins, and at this pitch the premium over LCD all but disappears on big walls. Small fixed-size walls on tight money — LCD still buys the picture. Ladder background: pixel pitch explained.
Price Transparency
How Much Does a P4 Indoor LED Display Cost?
Market reference ranges (board prices scanned from live listings, converted at 19.5 boards per square meter, and cross-checked against complete-wall quotes — September 2026 market listing scan):
Context: control runs $500–2,000 more per project; local steel and fitting usually take another fifth to a third of screen value. Inside the board, LED chips and the driver set carry most of the cost — pitch fixes lamp count, and lamp count fixes price. Every figure is a scan, never a quote.
Applications
Where Does a P4 Indoor LED Display Deliver the Most Value?
Eight placements where the 8–15m viewing band makes the 4mm class the smart buy:
Projects
What Have Real P4 Indoor LED Display Projects Looked Like?
Reference placements for the class — worship hall, auditorium, retail atrium and legacy extension. Named references available for your market on request:
FAQ
P4 Indoor LED Display: Frequently Asked Questions
What viewing distance does a P4 indoor LED display need?
Place the nearest reader at 6 meters or further; the class is at home across 8–15 meters. There, lyrics, video and presentations all read cleanly. Under 6 meters, P3 carries the detail — this pitch is not built for desk-side rooms.
P4 or P3.91 — the pitches are nearly identical, so which one?
Let duty decide, not the decimal. The densities are a near-tie — 62,500 against 65,536 px/㎡ — but the platforms differ: P4 hangs on iron or die-cast cabinets with magnet front service, built for a permanent wall; P3.91 rides quick-lock rental cabinets built for tours and events. A wall that stays buys P4; a wall that moves buys P3.91.
Why four module formats — and does the picture change between them?
Buildings standardised on different cabinet grids, and the class grew a format for each: the 320×160mm mainstream on 640/960mm boxes, the 256×128mm long board and 256×256mm big square on 512/768mm boxes, the 160×160mm legacy square for extensions. All four tile the 4.00mm grid exactly and land on 62,500 px/㎡ — the picture never changes, so the choice is pure cabinet and installation arithmetic.
1,920Hz or 3,840Hz refresh — which build should I order?
Let the audience set the scan. 1,920Hz covers lyric walls, signage and content-only duty at the lighter price; 3,840Hz goes wherever cameras point — lecture capture, livestreams, broadcast sets. The tier is built by the driver generation and receiving card, so write it into the order.
How much power does a P4 indoor LED display draw?
Count on about 4W peak for a mainstream board — near 78W/㎡ at full white — while ordinary content runs 25–45W/㎡. Ten square meters around the clock at 35W/㎡ comes to roughly 3,100 kWh a year, close to $300 on commercial rates. Nothing in the indoor family bills lighter.
How is a P4 wall serviced once it hangs?
At the face, always — strong magnets hold every module, so a board lifts out in seconds, tool-free, with no rear walkway needed. With 3% spare boards and a matching receiving card shelved, routine faults — a dark board, a drifting module — close the same day.
Can a P4 wall extend an older P4 installation?
Yes — that is what the 160×160mm legacy square is for. Older P4 fields were built on the 160mm grid with SMD2121 lamps; the legacy board tiles the same 640×640mm cabinet at the same 4.00mm pitch, so an extension matches the existing field board-for-board. Measure the old board’s pitch and lamp before ordering, and the new section disappears into the old one.
How much does a P4 indoor LED display cost per square meter?
September 2026 market scans price a standard SMD2020 fixed wall — boards, cabinets, power, basic control — between $180 and $320 per square meter factory-direct; boards alone trade at $4–7 per 320×160mm piece. The 3,840Hz build adds 10–15%, GOB another 10–15%, and control another $500–2,000 per project. Scans throughout, never quotes.
Full Guide
Why the P4 Indoor LED Display Is the Value Floor of the Small-Pitch Family
A P4 indoor LED display is where the small-pitch family meets big-room budgets: four module formats, all on one exact 4.00mm grid, all landing on precisely 62,500 pixels per square meter — at a per-square-meter price roughly a quarter of the 2.5mm class. This guide walks the class from both ends: why four formats share one honest grid, and which order-form decisions (lamp, scan, cabinet, face) separate a good P4 wall from a mediocre one.
Four formats, one honest grid
The defining trick here is arithmetic. The mainstream 320×160mm board lays 80×40 = 3,200 dots across a true 4.00mm grid. The 256×128mm long board lays 64×32 = 2,048 dots — 4.00mm again. The 256×256mm big square lays 64×64 = 4,096 dots — 4.00mm once more. And the 160×160mm legacy square lays 40×40 = 1,600 dots, 4.00mm still. Four boards, four cabinet ecosystems, a single density: 62,500 px/㎡ every time, with no rounding anywhere.
That property is rarer than it sounds. Most pitch classes carry a naming split — “P1.5-class” boards that measure 1.538mm, “P3” walls that measure 3.0769mm — because the industry’s standard board sizes do not divide those pitches evenly. At 4.00mm, every legacy board size happens to tile the grid exactly, so the class quotes faster than any other in the family: whatever format a building needs, the density promise holds.
The band: why 4mm owns 8–15 meters
Lamp count sets the band. At 62,500 px/㎡ the wall resolves clean lyrics, video and presentation content from about 8 meters and stays comfortable through 15 — the band where worship halls, auditoria and big retail atria actually place their audiences. One band tighter, P3’s 105,625 px/㎡ carries concourse detail at a step up in price; one band wider, the coarser rental classes bank the difference. P4 owns the volume middle with the family’s lightest bill: a mainstream board peaks near 4W, boards alone trade at $4–7 a piece, and complete walls land at $180–320 per square meter factory-direct.
The crossover: P4 versus P3.91, settled by duty
The strangest comparison on the shelf is also the most common in real tenders: P4 at 62,500 px/㎡ sits a hair coarser than P3.91 at 65,536 px/㎡ — yet P4 is the fixed-install board and P3.91 is the rental workhorse. The two share a viewing band almost exactly, so density cannot decide the question. Duty does. A wall that hangs for a decade buys P4: iron or die-cast cabinets, magnet front service, and the lightest power bill in the family. A wall that tours buys P3.91’s quick-lock cabinets, flight cases and one-hour installs. Buyers who compare the two on pixels per dollar are comparing the wrong axis — the honest frame is pixels per duty cycle.
Lamp, scan, cabinet: the order-form decisions
This class fixes the lamp per format — SMD2020 on the mainstream and big square, SMD1515 on the long board, the classic SMD2121 on the legacy square — which removes one decision most pitches force on buyers. What remains is the scan: the mainstream board carries both 1,920Hz and 3,840Hz as an order-line, and the choice is real money for real difference. Content-only rooms bank the budget; camera-facing rooms name the high tier. Cabinet material splits the same way: iron boxes for budget fixed walls, die-cast aluminum where weight, seams and finish lead.
Quality still hides in three places: lamps consistency-selected before the line, dot-level calibration held in the receiver and refreshed on site, and the scan tier written into the order. Three gates precede shipment — a dark-screen uniformity sweep, a slow-motion capture proving the scan, and a long soak watching for color drift — all on our floor.
The face: SMD today, GOB where hands reach
At 4mm the lamps are the hardiest in the family, and the face question is mostly about traffic. SMD at base cost is the closed-room default — discrete lamps, deep blacks, magnet swaps in seconds. GOB lays a clear coat and buys corridor, retail and exhibition durability for 10–15% over base — sensible wherever trolleys, luggage and cleaning crews cross the floor. COB seals the face completely at a 40–60% premium, which at this pitch rarely pays: the same money usually buys more GOB-covered area. Traffic picks the face — and press the question with any supplier whose catalog offers a single one.
Power and the big wall
The volume pitch is also the thriftiest. One mainstream board peaks near 4W — about 78W/㎡ at full white — with ordinary content between 25 and 45W/㎡, and ten square meters around the clock burn roughly 3,100 kWh a year. A 5V 40A supply from Chuanglian Power or MEAN WELL rides in each cabinet, keeping failure domains cabinet-sized. Face-only service closes the picture: boards lift out on strong magnets, the installation pattern that brings hard-board walls flush to structure in big retrofitted rooms.
The 6-point buying checklist for a P4 indoor LED display
- Set the band first — 8–15m keeps you here; inside 6m step to P3, past 15m let the coarser classes keep the money.
- Decide the wall’s life — hangs forever: this fixed platform; tours: the P3.91 rental cabinet family.
- Choose the format by building grid — 320×160 mainstream, 256-family for 512/768mm cabinets, 160×160 legacy square for extensions.
- Name the refresh tier in the order — 1,920Hz content rooms; 3,840Hz wherever cameras point.
- GOB where hands reach — the 10–15% coat is cheap insurance on touched and cleaned walls.
- Contract magnet front service and 3% spares — the no-tool swap and the spare shelf turn faults into non-events.
Run the list in order and the class reduces to arithmetic. A P4 indoor LED display is not the finest board on the shelf — it is the value floor where four honest formats, one exact grid and the family’s lightest bill converge, and that is precisely where big-room budgets sign.
Related P4 Indoor LED Display Resources
P5 Indoor LED Display Collection →
P2.5 Indoor LED Display Collection →
P2.0 Indoor Fine Pitch LED Display Collection →
P4 Outdoor LED Display Collection →
P3.91 Indoor Rental LED Display Collection →
LED Screen Calculator →
LED Display Power Supply Hub →
LED Control System Hub →
Pixel Pitch Explained →
Spec Your P4 Indoor LED Display With Our Engineers
Send the hall, the closest seat and the target wall size. The quote itemizes board format, lamp build, refresh tier, cabinet material, encapsulation and the control rack — factory-direct, 3% spares included.
UnifyLED — LED screen manufacturer · unifyledscreen@gmail.com · Changsha / Shenzhen, China
Browse our guides: Indoor LED Display Buying Guide