Indoor P3.91 Rear Window Display

I. Core Product Features

The Indoor P3.91 Rear Window Display is specifically designed for in-vehicle applications. Its highly transparent, open-frame light bar design offers a light transmittance of over 75%, ensuring it does not obstruct the driver’s view. It is ideal for advertising on the rear windows of ride-hailing vehicles and private cars. It supports 4G/WiFi remote cluster control, features automotive-grade shock-resistant and anti-interference construction, and offers easy installation without damaging the vehicle body. It is widely used in urban mobile advertising, public service announcements, and other scenarios.

Pixel Pitch: P3.91mm; select models support adjustable pitch between P7.8 and P3.91

Core Advantages: High transparency, automotive-grade protection, ultra-thin and portable, quick installation and removal

Typical Applications: Ride-hailing vehicles / private car rear window advertising, brand promotion, public service campaigns, and other scenarios

II. Key Product Features

High Transparency Without Obstructing View: The Indoor P3.91 Rear Window Display features a perforated light bar design with over 70% light transmittance. This ensures clear visibility of the exterior advertisement while avoiding obstruction of the driver’s rear view, meeting driving safety standards.

Automotive-Grade Stability: Built-in anti-vibration and voltage fluctuation protection modules ensure reliability in bumpy roads, stop-and-go traffic, and extreme temperature conditions, minimizing the risk of failure during long-term use.

Lightweight and Quick Installation: No drilling or wiring required. It attaches to the inside of the rear window using suction cups or Velcro, allowing a single person to install or remove it without damaging the vehicle’s glass or interior.

Remote Smart Management: The Indoor P3.91 Rear Window Display supports 4G/5G wireless connectivity, enabling remote batch ad deployment, scheduled playback, and real-time monitoring of device status—ideal for centralized operational management of fleets and ride-hailing platforms.

Rich Content Formats: The Indoor P3.91 Rear Window Display supports a variety of content formats, including images, videos, animations, and scrolling text. It can be customized with brand advertisements, public service announcements, holiday greetings, and other materials.

III. Applicable Scenarios and Advantages

Scenario Type | Application Advantages

Ride-Hailing / Private Vehicle Advertising: Highly mobile, covering urban roads, commercial districts, and residential communities; offers high exposure efficiency at a cost significantly lower than fixed outdoor advertising.

Brand Promotion / Event Promotion: Enables precise targeting of vehicle traffic in commercial districts and around trade shows for targeted communication.

Public Service / Government Promotion: Suitable for urban civility slogans, traffic safety reminders, and similar content; offers high flexibility in dissemination.

IV. Key Usage and Maintenance Points

Installation Notes: The Indoor P3.91 Rear Window Display must be mounted on the inside of the vehicle’s rear window, ensuring it does not obstruct the rear windshield’s defrosting lines or heating elements and does not interfere with the rear window’s up/down function.

Power Safety: When connecting directly to the vehicle’s power supply, use a dedicated step-down cable to prevent equipment damage caused by voltage fluctuations.

Daily Maintenance: Regularly clean dust from the surface of the LED strips and prevent moisture from entering. When not in use for extended periods, disconnect the power supply and store the device away from direct sunlight and high-temperature environments.

Compliance Notice: When using the Indoor P3.91 Rear Window Display, comply with local traffic regulations. Avoid displaying content that may distract other drivers, such as intense flashing lights or inappropriate material. Do not obscure license plates or obstruct the driver’s line of sight.