Are the lamp beads on the billboard LED?

Currently, LED luminous character billboards are relatively popular. Here are some common luminous characters.

1. Acrylic luminous characters

Three-sided acrylic luminous characters, the front and sides are acrylic, the bottom plate is PVC surrounding the characters: the material is acrylic (imported board and domestic board) panel , thick PVC material surrounds, and the inner core of the characters is covered with LED light source. The advantages are that it lights up at night, the surface is glossy, the color is bright, waterproof, and the most important thing is energy saving. The disadvantage is that the characters cannot be made too small. It is suitable for indoor and outdoor, store signboards, Large corporate promotional building word logo.

2. Blister luminous characters

The material function of blister luminous characters is similar to that of flat luminous characters, except that the strokes of the characters are raised tangible surfaces. The advantages are more classy, ​​strong, wear-resistant and waterproof. , energy saving. It is suitable for all kinds of outdoor advertising characters, and the whole blister panel is more suitable for store signboards and image walls.

3. Light box characters

It combines the craftsmanship of stainless steel and aluminum characters. The biggest breakthrough is that the characters emit light by themselves, eliminating the need for external lighting at night. , the specific method is to hollow out the text strokes, replace them with light-transmitting acrylic sheets, and install cold light source 3.3 (daylight tube) or neon lights in the inner cavity of the text, so that it can take advantage of the natural contrast effect of colors during the day, and at night For example, it emits light by itself, and there are no spots caused by external lighting on the surrounding walls. The text effect is quite obvious, but the disadvantage is that the cost is higher and the maintenance is slightly complicated. You need to use tools such as a gondola to remove the outer panel to replace the light source.

4. LED luminous characters

LED is a sign material category that has just developed rapidly in recent years. It can replace neon lights and can be used in restaurants, shopping malls, convenience stores, open-air squares and buildings. Light box signs and luminous characters. It has the advantages of high brightness, long life (up to 150,000 maintenance-free hours), high efficiency, easy installation, reliable performance, and high cost performance, making it widely used.

5. Exposed luminous characters

The plane and surrounding edges are the same as those of ordinary luminous characters. The only difference is the light source, which is composed of small dot LED lamp beads and covers the panel with characters. The advantage is that it can emit a strong light source no matter day or night, and it is energy-saving. Other features are the same as the Yak edge luminous characters, and it is suitable for use in store signs, KTV, nightclubs, hotels, guesthouses and other entertainment venue signs.

1. Different main bodies

1. LED chip: also called LED light-emitting chip, it is the core component of LED lamp, which refers to the P-N junction. A solid-state semiconductor device.

2. Lamp beads: LED is the English abbreviation of light-emitting diode.

3. Wafer: It is the core part of LED. A single crystal is fixed on a plastic or ceramic chip base.

2. Different principles

1. LED chip: the two electrodes are on the same side of the epitaxial wafer. Since the electrodes are on the same side, the current flows in the n- and p-type limiting layers. Lateral flow is not conducive to the spre ad of current and the dissipation of heat.

2. Lamp beads: The terminal voltage of the PN junction forms a certain potential barrier. When a forward bias voltage is applied, the potential barrier drops, and the majority carriers in the P and N regions diffuse toward each other.

3. Wafer: The main optoelectronic parameters such as wavelength, brightness, and forward voltage of LED basically depend on the wafer material.

3. Different characteristics

1. LED chip: Evaluating the quality of the LED chip mainly depends on the bare chip It is measured by two main standards: brightness and attenuation. In the packaging process, it is mainly calculated from the yield rate of LED chip packaging.

2. Lamp beads: LED lamp beads use low-voltage power supply, and the power supply voltage is between 2-4V, which varies according to different products, so it is driven by a safer power supply than high-voltage power supply, which is particularly suitable for in public places.

3. Wafer: The crystal structure of the wafer material and the substrate is the same or similar, the lattice constant mismatch is small, the crystallization performance is good, and the defect density is small.

Reference source: Baidu Encyclopedia-LED wafer

Reference source: Baidu Encyclopedia-LED lamp beads

< p>Reference source: Baidu Encyclopedia-LED Chip