CN201335304Y - LED backlight structure - Google Patents

Abstract

The utility model discloses an LED backlight structure, comprising a substrate and a plurality of LED chips which are linearly arranged on the substrate, wherein at least one rectangular reflective module which is arranged on the LED chips in a covering way is arranged on the substrate, and each inner surface of the reflective module is of an arc concave surface; and the arc curvature of opposite inner surfaces is different. The arc concave surfaces have directed condensation action for the light rays of the LED chips and can converge the light rays scattered by LEDs in the directions in which the backlight needs to illuminate, therefore not only increasing the distance of illumination of the light rays in effective regions, but also preventing the loss of the light rays in non-effective light-emitting regions of the backlight, thereby improving the luminous efficiency of the effective regions of the LED backlight, and increasing the illumination brightness of the effective regions of the backlight; and in addition, the non-symmetric reflective curved surfaces are arranged so as to obtain the brightness required by the far side of large-size backlight and also ensure the uniformity of single-side incident light rays of the large-size backlight.

Description

LED backlight structure

technical field

The utility model relates to the optical and image processing fields of electronic equipment, in particular to an LED backlight structure applied to a liquid crystal display.

Background technique

The development of backlight can be traced back to World War II, when ultra-small tungsten filament lamps were used as the backlight of aircraft instruments. With the continuous development of liquid crystal display technology, the backlight source used in the liquid crystal display has the characteristics of high brightness, long life and uniform light emission. At present, there are mainly three types of backlight sources: EL, CCFL, and LED. According to the location of the light source, they are divided into side-lit and direct-lit. The most commonly used edge-lit types are LED backlight and CCFL backlight. With the continuous development of LCD modules in the direction of brighter, lighter and thinner, edge-lit CCFL backlights have become the mainstream of backlight development. Due to some inherent deficiencies of CCFL (Cold Cathode Fluorescent Lamps, Cold Cathode Fluorescent Lamps) backlight technology and products on traditional LCD display devices, such as narrow color gamut, low energy efficiency, high power consumption, and short life, people have been looking for Its alternative technologies and products, and in this process, LED backlight technology products have been included in the selection of people.

Since the LED backlight is a point light source, if you want to increase the brightness of the LED backlight, you must increase the number of LEDs, which will lead to an increase in energy consumption and heat. Therefore, how to improve the light utilization of LEDs is an industry research topic.

Utility model content

The purpose of the utility model is to provide an LED backlight source structure which can effectively improve the light utilization rate of the LED to increase the brightness of the backlight.

In order to achieve the above object, the solution of the utility model is: an LED backlight structure, including a substrate and a plurality of LED chips, and the LED chips are linearly arranged on the substrate; wherein: at least one rectangular reflective module is arranged on the substrate, The reflective module is arranged on the base plate, each inner surface of the reflective module is an arc-shaped concave surface, and the arc curvatures of the inner surfaces opposite to each other are different.

The reflective module is a rectangular block formed in response to the size of the corresponding substrate. Its upper end is open, and its front, rear, left, and right inner surfaces are respectively arc-shaped and concave from the upper end to the bottom to form an asymmetric curved surface. A linear groove penetrating left and right is formed, and the linear groove communicates with the curved surface to allow the LED chips to pass through.

The curvature of the asymmetric curved surface is set according to the size of the light guide plate.

The width of the linear groove is greater than that of the LED chip.

A plurality of matching protrusions are arranged on the lower surface of the reflective module.

The reflective modules are provided with a plurality of arrays arranged on the substrate.

The reflective module is a metal reflective plate or other materials coated with reflective surfaces.

A reflective layer is provided on the inner surface of the reflective module.

After adopting the above scheme, since the substrate of the LED chip of the LED backlight is provided with an arc-shaped reflective module, the utility model utilizes each arc-shaped surface to have a directional concentrating effect on the light of the LED chip, and adjusts the curvature of the curved surface and The position can make the light scattered by the LED converge in the direction where the backlight needs to be irradiated, which not only increases the distance of the light in the effective area, but also effectively prevents light loss, so as to improve the light efficiency and illumination brightness of the LED backlight. In addition, the arc-shaped curved surfaces opposite to each other of the reflective modules are arranged asymmetrically, which can obtain the brightness required for the far edge of the large-size backlight and the uniformity required for single-sided incidence.

In addition, the arrangement of multiple reflective modules can prevent the reflective modules from being deformed on the linear substrate, further improving the light efficiency and uniformity of the LED backlight source.

Description of drawings

Fig. 1 is a partial combined schematic diagram of the utility model;

Fig. 2 is a partial combined top view of the utility model;

Fig. 3 is a combined sectional schematic view of the utility model;

Fig. 4 is a three-dimensional schematic diagram of the reflective module of the present invention;

Fig. 5 is a side view of the reflective module of the present invention;

Fig. 6 is a top view of the reflective module of the present invention;

Fig. 7 is a schematic diagram of the implementation of the utility model.

Detailed ways

As shown in FIGS. 1 to 3 , the LED backlight structure of the present invention includes a substrate 1 , a plurality of LED chips 2 and a plurality of reflective modules 3 .

The substrate 1 is a strip-shaped linear plate, and the LED chips 2 are arranged on the substrate 1 in a line;

As shown in Figures 4, 5, 6, and 7, the reflective module 3 is a rectangular block formed in response to the size of the substrate 1. An asymmetric curved surface 32, and the left and right inner surfaces are also arc-shaped and concave from the upper end to the bottom to form an asymmetric curved surface 33, and the curvature of the asymmetric curved surfaces 32, 33 is set in response to the length and width of the light guide plate 4; The bottom of the reflective module 3 is formed with a through linear groove 34, which communicates with the curved surfaces 32, 33. The width of the linear groove 34 is greater than the width of the LED chip 2; There are a plurality of matching protruding feet 35 , correspondingly, embedded holes for cooperating with the protruding feet 35 are provided on the substrate 1 .

The reflective module 3 can be directly made of a metal plate, utilizing the reflective properties of the metal, or coated with a reflective layer on the curved curved surfaces 32, 33 of the module made of non-metallic materials, or coated with other materials with reflective surfaces Reflective effect can also be achieved.

When combined, each reflective module 3 is arranged in sequence and embedded on the substrate 1 by using its protruding feet 35, and at the same time, each LED chip 2 is protruded from its linear groove 34, so that each LED chip 2 is covered by the reflective module. In the arc-shaped curved surfaces 32, 33 of 3, using the reflection principle of the concave mirror, the light-reflecting module 3 gathers the light emitted by the LED point light source from the arc-shaped curved surfaces 32, 33 and irradiates the effective area from the opening orientation, so as to prevent The loss of light on the non-luminous surface increases the distance of light irradiation and the brightness of the effective area to improve the light effect of the effective area; in addition, the setting of the asymmetric reflective surfaces 32 and 33 can obtain the brightness required by the far edge of the large-size backlight, At the same time, it can ensure the uniformity of the light when the large-size backlight is incident on one side.

Certainly, the reflective module 3 can be arranged as one in response to the length of the substrate 1. Since the length of the linear substrate 1 is longer, in order to prevent the deformation of the reflective module 3, it is arranged in multiples and arranged on the substrate 1 for the light of the LED chip 2. The reflective accuracy is better, and in addition to the design of the asymmetric arc-shaped curved surface 33 on the left and right inner surfaces of each reflective module 3, it can avoid light "blind spots" after the combination of each reflective module 3.

Claims (9)

1, a kind of LED-backlit source structure comprises substrate and a plurality of led chip, and led chip is linear array on substrate; It is characterized in that: substrate is provided with at least one rectangular reflective module, this reflective module be the cover place on the led chip, in the reflective module on substrate linearly aligned two interior surface opposing be to be the different arc-shaped concave of arc curvature.

2, LED-backlit source structure as claimed in claim 1 is characterized in that: each inner surface of reflective module is arc-shaped concave, and the arc curvature of inner surface facing each other is different.

3, LED-backlit source structure as claimed in claim 1, it is characterized in that: the curvature of described asymmetric curved surface is provided with in response to the size of LGP.

4, LED-backlit source structure as claimed in claim 1, it is characterized in that: reflective module is a rectangle block that forms in response to the size of substrate, its upper end is uncovered, its all around inner surface distinguish curved indent downwards from the upper end to form asymmetric curved surface, the linear groove that connects about being formed with below the reflective module, this linear groove passes to mutually with curved surface and makes led chip pass through.

5, LED-backlit source structure as claimed in claim 4, it is characterized in that: the width of linear groove is greater than the led chip width.

6, as claim 1,2,3 or 4 described LED-backlit source structures, it is characterized in that: the lower surface of reflective module is provided with the protruding pin of a plurality of cooperations.

7, as claim 1,2,3 or 4 described LED-backlit source structures, it is characterized in that: reflective module is provided with a plurality of being arranged on the pcb board.

8, as claim 1,2,3 or 4 described LED-backlit source structures, it is characterized in that: reflective module is metal reflective plate or the other materials that is coated with reflecting surface.

9, as claim 1,2,3 or 4 described LED-backlit source structures, it is characterized in that: the reflective module inner surface is provided with reflector layer.

Images