TWI395904B - Light - emitting structure without light guide plate - Google Patents

Description

Light-emitting structure without light guide plate

The invention relates to a light-emitting structure without a light guide plate, in particular to a backlight module or other similar light-emitting structure, in which a uniform light-emitting surface can be scattered by the diffuser plate without using a light guide plate.

The present invention is generally used in a backlight module of a liquid crystal display, such as the "backlight module" of the Republic of China Patent No. 200825553, which comprises at least one light guide plate, at least one light source is disposed on one side of the light guide plate, and a diffusion plate is disposed above the light guide plate. However, the light guide plate and the light mixing space are not in contact with each other, and are located between the light guide plate and the diffusion plate, so that the light emitted from the light exit surface of the light guide plate can be fully mixed in the light mixing space, and then the backlight module is emitted by the diffusion plate. However, the disadvantage is that the design of the backlight module is nothing more than the use of the light guide plate as a guiding medium for the light source, but the light source consumes energy through the light guide plate, resulting in a reduced light-emitting effect, such as a small-sized side-lit backlight module. The efficiency is mostly lower than 70%, and the backlight efficiency of the backlight module used for the monitor is only slightly higher than 50%.

Therefore, there is a "Planar light source device and display device using the same device", which is constructed by changing the structure of the bottom optical reflector to form a light-emitting structure that does not use a light guide plate, thereby increasing the amount of light, but the disadvantage is that Although the middle portion of the bottom optical reflector is raised to improve the illuminance of the light refracted by the middle portion of the diffuser, the light reflected or scattered by the optical reflector may be uneven, resulting in being reflected by the diffuser. The brightness of the light-emitting surface produced by the light is uneven, and if no optical element is added When the piece guides the direction of light projection, it is also easy to produce a phenomenon in which the two sides are brighter and the middle section is darker.

Therefore, in view of the lack of the conventional light-emitting structure, the present invention provides a light-emitting structure without a light guide plate, comprising: an optical bottom plate provided with at least one raised portion, the raised portion forming a raised surface; Located on two sides adjacent to the optical bottom plate, and the radiation half power angles of the two light sources are 15 degrees or less, respectively forming an optical axis direction, the optical axis directions of the two light sources are toward the raised surface, and the optical axis direction is A light radiation field is respectively formed for the center, and the light radiation field projects the ridge surface; a diffusion plate is disposed in a bulging direction of the ridge portion of the optical floor.

The radiation source has a radiation half power angle of 5 to 15 degrees.

The above light source is an LED light bar.

An optical film is disposed on the optical substrate.

The raised surface of the above-mentioned optical floor ridge section is provided with a plurality of irregular shaped vacancies.

The embossing surface of the above-mentioned optical floor ridge section is provided with a plurality of V-shaped slots.

A reflective cover is respectively connected to the two sides of the optical bottom plate, and the light source is fixed in the reflective cover, and the diffusing plate is connected to the reflective cover.

The invention has the following advantages:

1. The present invention can reduce the thickness and weight of the light-emitting structure without using the light-emitting structure of the light guide plate.

2. The irregular surface of the optical base plate of the present invention is provided with an irregular shape groove or a V-shaped groove, so that the light can be more uniformly reflected and scattered, and the brightness of the light-emitting surface is more uniform, and the light-emitting structure can also be improved. Luminous brightness.

3. The present invention uses a high directivity light source having a radiation half power angle of 15 degrees or less, and directs the optical axis direction of the light source toward the raised surface of the optical floor ridge section, thereby causing most of the light to be projected onto the optical base plate to increase scattering. The light from the diffuser can also greatly increase the brightness of the light.

(1)‧‧‧Optical backplane

(11) ‧ ‧ uplift

(111) ‧ ‧ raised surface

(12) ‧ ‧ missing slot

(13)‧‧‧V-shaped grooving

(2) ‧‧‧reflector

(3) ‧‧‧Light source

(31) ‧‧‧ optical axis direction

(32) ‧‧‧Light field

(4) ‧‧‧Diffuser

(5) ‧‧‧Optical film

(A) ‧ ‧ frame

The first figure is a three-dimensional appearance of the implementation of the frame of the present invention.

The second drawing is a cross-sectional view of the implementation of the mating frame of the present invention.

The third figure is a schematic view of the optical axis direction of the invention pointing in parallel to the ridge surface.

The fourth figure is a schematic view of the optical axis direction of the invention pointing obliquely toward the ridge surface.

The fifth figure is a schematic view of the light uniformly scattered by the diffusing plate when the invention is used.

The sixth figure is a schematic view of the light radiation field of the light source projected onto the ridge surface when the invention is used.

The seventh figure is a schematic view showing the arrangement of an optical film on the embossed surface of the present invention.

The eighth figure is a schematic view of the irregular shape of the raised surface of the present invention.

The ninth drawing is a schematic view of the V-shaped slit formed in the ridge of the present invention.

Referring to the first and second figures, the present invention is a light-emitting structure without a light guide plate, which is assembled on a frame (A), comprising: an optical bottom plate (1), which is provided with at least a ridge portion (11), the ridge portion (11) forms a ridge surface (111); the two reflectors (2) are connected to the two sides of the optical bottom plate (1); the two light sources (3) are The LED light bar is located on two sides adjacent to the optical bottom plate (1), and the radiation source half power angle (RADIANT HALF-INTENSITY ANGLES) of the two light sources (3) is 15 degrees or less, and has high directivity, and The optimum range is 5 degrees to 15 degrees, and the two light sources (3) respectively form an optical axis direction (31), and the optical axis directions (31) of the two light sources (3) face the raised surface (111). [Refer to the third and fourth figures, the two light sources (3) are at different heights, but the optical axis direction (31) is directed toward the raised surface (111)], and the optical axis direction ( 31) forming a radiation field (32) (RADIATION FIELD) for the center, the light radiation field (32) projecting the raised surface (111) [see the sixth figure]; a diffusion plate (4), Set on the optical bottom plate (1) (11) Since the direction of the raised section, the present embodiment of the diffuser plate (4) is connected to the reflector (2).

When using, please refer to the fifth and sixth figures, because the two light sources (3) radiate half work The angle of incidence is 15 degrees or less, so the two light sources (3) have high directivity, which forms an optical axis direction (31) and faces the raised surface (111), and the optical radiation field (32) projects the ridge. a surface (111), thereby reducing light scattered directly from the position of the diffusing plate (4) adjacent to the two light sources (3), preventing the illuminance on both sides of the diffusing plate (4) from being larger than the middle portion of the diffusing plate (4) Illumination, in addition, the reflector (2) can reflect the light emitted by the two light sources (3) not to the optical substrate (1), and can also increase the overall luminance, and the raised portion of the optical substrate (1) (11) The closer the distance to the diffusion plate (4) is, the closer it is to the middle portion, thereby increasing the light scattered by the middle portion of the diffusion plate (4), and the light source (3) can be improved on the optical substrate (1) On the side, the illuminating luminance of the diffusing plate (4) is greater than that of the middle portion, so that the light is scattered by the diffusing plate (4) to form a uniform illuminating surface.

Referring to the seventh figure, an optical film (5) can be disposed on the raised surface (111) by a film forming method such as electroplating, vapor deposition or sputtering, and the optical film (5) has light collecting and increasing light reflectance. The effect is to increase the light scattered by the diffusing plate (4) and enhance the brightness of the light.

Referring to the eighth figure, a plurality of irregular shaped notches (12) are arranged on the raised surface (111) by sandblasting or beading, and when the light is projected onto the raised surface (111), the missing groove is formed. After (12), a more uniform reflection and scattering can be produced, so that the brightness of the light-emitting surface generated by the light scattered by the diffusing plate (4) is more uniform.

Referring to the ninth figure, a plurality of V-shaped slots (13) are disposed on the raised surface (111), so that when the light is projected onto the raised surface (111), the reflection direction thereof is directed toward the diffusion plate (4). The direction is increased, and the light scattered by the diffusing plate (4) can be increased to increase the luminance of the light.

(1)‧‧‧Optical backplane

(11) ‧ ‧ uplift

(111) ‧ ‧ raised surface

(2) ‧‧‧reflector

(3) ‧‧‧Light source

(31) ‧‧‧ optical axis direction

(4) ‧‧‧Diffuser

(A) ‧ ‧ frame

Claims (7)

A light-emitting structure without a light guide plate comprises: an optical bottom plate provided with at least one ridge portion, wherein the ridge portion forms a ridge surface; and two light sources are located on two sides adjacent to the optical bottom plate, and the radiation source of the two light sources The power angle is 15 degrees or less, and an optical axis direction is respectively formed. The optical axis directions of the two light sources are toward the ridge surface, and an optical radiation field is respectively formed around the optical axis direction, and the optical radiation field is projected. The raised surface; a diffusing plate is disposed in a bulging direction of the raised portion of the optical bottom plate. The light-emitting structure without a light guide plate according to claim 1, wherein the two light sources have a radiation half power angle of 5 to 15 degrees. The light-emitting structure without a light guide plate according to claim 1, wherein the two light sources are LED light bars. The light-emitting structure without a light guide plate according to claim 1, wherein an optical film is disposed on the optical substrate. The light-emitting structure without a light guide plate according to claim 1, wherein the raised surface of the raised portion of the optical bottom plate is provided with a plurality of irregular shaped notches. The light-emitting structure without a light guide plate according to claim 1, wherein the raised surface of the raised portion of the optical bottom plate is provided with a plurality of V-shaped slots. The light-emitting structure without a light guide plate according to the first aspect of the invention, wherein the two sides of the optical bottom plate are respectively connected with a reflector, the light source is fixed in the reflector, and the diffusion plate is connected to the reflector.