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Ambient Light Rejection · Ceiling Light Rejection · UST Projector Screens
ALR and CLR screens are both designed to improve projection performance in rooms with ambient light. The main difference is how they handle unwanted light and which projector setup they are best suited for.
ALR stands for Ambient Light Rejection. An ALR projector screen is designed to reduce the impact of unwanted room light and preserve image contrast. Depending on the optical structure, an ALR screen may reject light from the sides, above, or other directions while reflecting projector light toward the viewer.
ALR screens are commonly used in living rooms, conference rooms, classrooms, showrooms, and other spaces where complete light control is not always possible.
CLR stands for Ceiling Light Rejection. A CLR screen is mainly designed to reject light coming from above the screen, such as ceiling lights. Many CLR screens are used with ultra short throw projectors because the projector light comes from below the screen while unwanted ceiling light comes from above.
In many UST projector applications, the terms ALR and CLR are sometimes used together because a UST ALR screen often includes ceiling light rejection behavior as part of its optical design.
| Comparison | ALR Screen | CLR Screen |
|---|---|---|
| Main Purpose | Rejects or reduces ambient light from selected directions to improve contrast. | Specifically focuses on rejecting ceiling light from above the screen. |
| Light Rejection Direction | Depends on the optical design; may target side light, top light, or general ambient light. | Mainly targets light coming from overhead or ceiling fixtures. |
| Projector Compatibility | Available for UST, short throw, and standard throw projector applications depending on screen material. | Most commonly used with ultra short throw projector setups. |
| Viewing Angle | Varies by material. Some ALR screens offer wide viewing angles, while others are more directional. | May have a more directional viewing range depending on optical structure. |
| Typical Application | Home theater, living room, classroom, boardroom, commercial display, and AV projects. | UST laser TV setups, living rooms, and spaces with strong ceiling light. |
For most UST laser projector setups, a dedicated UST ALR screen with ceiling light rejection performance is usually the best choice.
SCREENPRO® T-Prism is an ambient light rejecting optical screen technology designed for ultra short throw laser projector applications. It uses a directional optical structure to guide projector light toward the viewer while reducing the impact of unwanted ambient light.
Unlike a standard matte white screen, T-Prism is engineered for modern UST projection environments where users want a large screen image in a living room, media room, or bright environment.
SCREENPRO offers multiple UST ALR screen structures for different installation environments, including floor rising, wall-mounted motorized, fixed frame, and in-ceiling systems.
Not exactly. ALR is a broader term for ambient light rejecting screens, while CLR usually refers to screens designed to reject ceiling light, especially for UST projector setups.
CLR is not always better. It depends on your projector type and light source direction. For UST projectors with ceiling lights, CLR-style rejection is useful. For other lighting conditions, an ALR screen designed for your projector type may be more suitable.
For a UST projector, a UST ALR screen with ceiling light rejection performance is usually recommended because it helps maintain contrast and reduce image washout in bright rooms.
Usually no. Many CLR screens are designed for projector light coming from below the screen. A standard throw projector uses a different light path, so you should choose a screen material matched to the projector type.
SCREENPRO T-Prism is an optical ALR screen technology designed for UST laser projector applications. It helps guide projector light toward the viewer while reducing unwanted ambient light.
SCREENPRO can help you match the right UST ALR, T-Prism, acoustic transparent, or custom projection screen solution based on projector type, room lighting, and installation method.
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