CN203309653U

CN203309653U - LED backlight module based on liquid crystal display television

Info

Publication number: CN203309653U
Application number: CN2012207283597U
Authority: CN
Inventors: 郭康贤; 康敏武
Original assignee: Guangzhou University
Current assignee: Guangzhou University
Priority date: 2012-12-26
Filing date: 2012-12-26
Publication date: 2013-11-27
Anticipated expiration: 2022-12-26

Abstract

The utility model provides an LED backlight module based on a liquid crystal display television. The LED backlight module comprises an LED light source, an outer frame, a reflector plate, a light guide plate, a light gathering piece and a diffusion piece. A position, close to an LED, of an incident plane is provided with uniformly-spaced sawteeth which are formed by circular arc sawteeth and triangular sawteeth in an alternately distributed mode, a reflecting surface is provided with net points used for scattering light, a light emitting surface is provided with protruding strips vertical to the emitting direction of the light, the protruding strips are formed by circular arc strips and triangular strips in an alternately distributed mode, and widths of the strips are increased along with increasing of the distances between the strips and the incident plane. The LED backlight module resolves the technical problems that an existing LED backlight module is insufficient in luminous flux, bad in LED heat dissipation capacity, complex in structure, single in function of a light guide plate, and not high in utilization efficiency of materials. The LED backlight module not only reduces the number of the light gathering piece but also reduces cost and thickness.

Description

A kind of module of LED-backlit based on LCD TV

Technical field

The utility model belongs to the LED application, is specifically related to a kind of module of LED-backlit based on LCD TV, and it can be widely used in various liquid crystal displays.

Background technology

Backlight module is an important component part of liquid crystal display device, and liquid crystal display is the physical characteristic work that utilizes liquid crystal, and when energising, liquid crystal arrangement is orderly, and light easily passes through; During no power, arrange and to become chaotic, light be not easy by.But liquid crystal itself can be not luminous, it needs additional back lighting device a---backlight module, and its function is exactly that the area source of high brightness, high uniformity is provided for liquid crystal display.The development of liquid crystal display industry has pulled the market demand of backlight module and associated component thereof, through development in recent years, the backlight module of Ultrathin high-brightness shared cost ratio in display panels improves constantly, especially the backlight module of LED light source, be subject to the attention of many transnational enterprises especially.Along with the continuous lifting of LED luminous efficiency, the range of application of LED-backlit module constantly enlarges, traditional LED-backlit module due to luminous flux not and the LED heat-sinking capability poor, often only be used in the undersized LCDs such as mobile phone and digital camera.Along with international LED manufacturer develops the highlighted LED that is applicable to LCD TV backlight, make LED-backlit module rapid osmotic to the LCD TV field.

Shown in Figure 1, traditional LED LCD TV backlight module is by orthogonal two concentration pieces of striped on two diffusion sheets, surface, and LGP, housing and reflector plate that LED light source, reflecting surface are provided with the reflection site form.This combination has following deficiency:

1), backlight module is blocked up, owing to having used a large amount of blooming pieces, such as two diffusion sheets, two concentration pieces), the backlight module thickness designed is large.

2), the LGP function singleness, because LGP is only to be provided with the reflection site at reflecting surface, LGP can only be broken up by the reflector net optics of naming a person for a particular job so, and can't collected light.

3), the service efficiency of material is not high, because the optical function of LGP is not given full play of, thereby realize that with too much blooming piece the function of LGP has not only increased the cost of backlight module, also reduced light extraction efficiency, because all blooming pieces have the absorption to light in various degree.

The utility model content

For solve existing LED-backlit module due to luminous flux not and the LED heat-sinking capability poor, complex structure, LGP function singleness, and the not high technical problem of the service efficiency of material, the utility model provides a kind of module of LED-backlit based on LCD TV.

A kind of module of LED-backlit based on LCD TV, comprise LED light source, housing, reflector plate, LGP, concentration piece, diffusion sheet, described LGP is the plane of incidence near LED light source one side, the plane parallel with the plane of incidence is that the downside of incident opposite, the described plane of incidence is that the upside of reflecting surface, the described plane of incidence is exiting surface, the described LGP plane of incidence has sawtooth, exiting surface has the convex stripe perpendicular with the incident ray direction, and reflecting surface has the reflection site.

Preferably, the sawtooth of the above-mentioned LGP plane of incidence is alternately to be arranged by triangle sawtooth and circular arc sawtooth, and described triangle sawtooth is identical with the width of circular arc sawtooth, further, the width of described triangle sawtooth and circular arc sawtooth is 0.08 millimeter-0.1 millimeter.

Preferably, above-mentioned exiting surface has the convex stripe perpendicular with the incident ray direction, described convex stripe is to be alternately distributed by triangle striped and circular arc type striped, and the width of described triangle striped and circular arc type striped is along with the distance of itself and LED light source increases and increases, width of fringe near the LED light source place is the 5-10 micron, and the width of fringe on close incident opposite is the 20-25 micron.

Preferably, above-mentioned reflecting surface has the emission site.

Preferably, the quantity of above-mentioned concentration piece is a slice.

Preferably, the mode of increase is exponential increasing to the width of above-mentioned triangle striped and circular arc type striped along with the distance increase of striped and light source.

Enforcement the utlity model has following advantage:

1, the utility model is by the improvement to the LED-backlit module, traditional backlight module is used to the structure of two concentration pieces, two diffusion sheets, optical design by LGP, make and only use a concentration piece, a diffusion sheet just can obtain satisfactory optical effect, not only simplify processing technology, also greatly reduced production cost.

The sawtooth of 2, alternately being arranged by circular arc and triangle near the LED position due to the plane of incidence can be broken up incident ray different directions effectively, the total reflection of light in LGP can be destroyed effectively in the site of reflecting surface, the striped of alternately arranging by circular arc and the triangle type of exiting surface can effectively be collected light and be penetrated by exiting surface, can also reduce simultaneously the usage quantity of concentration piece, reduce simultaneously cost and the thickness of backlight module.

The accompanying drawing explanation

Fig. 1 is the legacy device composition diagram of a kind of module of LED-backlit based on LCD TV of the utility model;

Fig. 2 is the parts composition diagram of a kind of module of LED-backlit based on LCD TV of the utility model;

Fig. 3 is a kind of module light guide plate of LED-backlit based on LCD TV of the utility model enlarged drawing;

Fig. 4 is the enlarged drawing of a kind of module light guide plate of LED-backlit based on LCD TV of the utility model A section;

Fig. 5 be a kind of module of LED-backlit based on LCD TV of the utility model with the perpendicular convex stripe spacing variation diagram of incident ray direction.

Description of reference numerals:

The 1-LGP; The 2-diffusion sheet; The 3-brightening piece; The 4-housing; The 5-reflector plate; The 6-LED light source.

The specific embodiment

A kind of module of LED-backlit based on LCD TV that the utility model provides is used the structure of two concentration pieces and two diffusion sheets by improving traditional backlight module, to the optical design of LGP, make and only use a concentration piece, a diffusion sheet just can obtain satisfactory optical effect again.Shown in Figure 2, the utility model provides a kind of module of LED-backlit based on LCD TV to comprise LGP, is arranged at the diffusion sheet in LGP front, be arranged at the brightening piece of diffusion sheet upper surface, be arranged at housing around LGP, be arranged at the sheet emitting at the LGP back side; Be arranged at the LED light source between diffusion sheet and LGP, LGP is the plane of incidence near light source one side, the plane parallel with the plane of incidence is that incident opposite, downside are that reflecting surface, upside are exiting surface, diffusion sheet and brightening piece are one, the LGP plane of incidence is laciniation, on exiting surface, setting tool has the convex stripe structure perpendicular with the incident ray direction, on reflecting surface, has the reflection site.Traditional structure generally arranges the triangle sawtooth at the plane of incidence, at exiting surface, the protruding triangle striped with incident ray direction vertical distribution is set.And the triangle sawtooth of the plane of incidence is arranged to triangle to the utility model and circular arc is alternately distributed, exiting surface is arranged to triangle and the alternatively distributed striped of circular arc with the perpendicular protruding triangle striped of incident ray direction, probability that like this can less light-ray condensing, because identical structure is easy to allow light propagate along identical position, will speck occur in some zone of backlight module like this, dim spot appears in some zone.In addition, because the sawtooth at the LGP plane of incidence is alternately to be arranged by triangle sawtooth and circular arc sawtooth, on exiting surface with the perpendicular convex stripe of incident ray direction be to be alternately distributed by triangle striped and circular arc type striped, make light in LGP, be broken up fully therefore LED-backlit module and use less a diffusion sheet.At exiting surface, having the convex stripe perpendicular with the incident ray direction is to be alternately distributed by triangle striped and circular arc type striped, these stripeds are equivalent to be distributed in the convex lens of light output surface, fully collected light penetrates along the direction perpendicular to exiting surface, played the left and right of concentration piece, so the LED-backlit module can be used a kind of concentration piece less.The laciniation of the LGP plane of incidence is alternately arranged and is formed by triangle sawtooth and circular arc sawtooth.The triangle sawtooth with shown in the width of circular arc sawtooth identical, the triangle sawtooth and shown in the width of circular arc sawtooth be 0.08 millimeter-0.1 millimeter.The convex stripe structure is alternately distributed and is formed by triangle striped and circular arc type striped, the width of triangle striped and circular arc type striped is along with the distance of convex stripe structure and light source increases and increases, width of fringe near the light source place is the 5-10 micron, width of fringe near the incident opposite is the 20-25 micron, dot density size is inversely proportional to the distance of site apart from light source, and the triangle striped of alternately arranging on the striped on concentration piece and exiting surface is mutually vertical with the circular arc type striped.In the process of propagating in backlight module due to light, can constantly be absorbed or penetrate along exiting surface, this just makes at the closer position light of the distance plane of incidence strong, and more weak at the distant position light of the distance plane of incidence, and the variation of this light intensity is exponential form.Specifically the mode of increase is exponential increasing to the width of triangle striped and circular arc type striped along with the distance increase of striped and light source, and exponential expression is W=B+(A-B) * e ^{λ x}, W means width of fringe, and B means striped span minimum of a value, and A means the width of fringe maximum, and λ is the width of fringe variation coefficient, x is the distance of striped apart from the plane of incidence.

Shown in Fig. 3-4, this figure is the LED-backlit module light guide plate enlarged drawing based on LCD TV, and the utility model, by the change to light conducting plate structure, becomes a diffusion sheet and a concentration piece by the architecture advances of two diffusion sheets and two concentration pieces.Sawtooth triangularity and circular arc type in this figure on the plane of incidence are alternately distributed, make the light that LED sends be broken up, shape difference due to sawtooth, the mode that light is broken up is also different, thereby fully destroyed the uniformity of light, wherein the tooth width of triangle and circular arc type is identical, and spacing is generally between 0.08 millimeter to 0.1 millimeter.At exiting surface, have the convex stripe perpendicular with the incident ray direction, these stripeds are enlarged as shown in Figure 3, the same with the sawtooth on the plane of incidence, these stripeds are also triangular in shape alternatively distributed with circular arc type, have certain light-focusing function, thereby make this LED-backlit module can save a concentration piece.

Shown in Figure 5, fringe spacing in this figure is distributed between 5 microns to 25 microns, width of fringe near the plane of incidence is less, therefore to the refracting power of light also a little less than, along with striped increases with the spacing between the plane of incidence, width of fringe also increases, and its refracting power to light also increases, make this striped can also allow light spread more equably on LGP, therefore make this LED-backlit module can save a diffusion sheet.

The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.

Claims

1. module of the LED-backlit based on LCD TV, comprise LED light source, housing, reflector plate, LGP, concentration piece, diffusion sheet, described LGP is the plane of incidence near LED light source one side, the plane parallel with the plane of incidence is that the downside of incident opposite, the described plane of incidence is that the upside of reflecting surface, the described plane of incidence is exiting surface, it is characterized in that: the described LGP plane of incidence has sawtooth, exiting surface has the convex stripe perpendicular with the incident ray direction, and reflecting surface has the reflection site.

2. a kind of module of LED-backlit based on LCD TV according to claim 1, it is characterized in that: the sawtooth of the described LGP plane of incidence is alternately to be arranged by triangle sawtooth and circular arc sawtooth, and described triangle sawtooth is identical with the width of described circular arc sawtooth, further, the width of described triangle sawtooth and described circular arc sawtooth is 0.08 millimeter-0.1 millimeter.

3. a kind of module of LED-backlit based on LCD TV according to claim 2, it is characterized in that: described exiting surface has the convex stripe perpendicular with the incident ray direction, described convex stripe is to be alternately distributed by triangle striped and circular arc type striped, and the width of described triangle striped and circular arc type striped is along with the distance of itself and LED light source increases and increases, width of fringe near the LED light source place is the 5-10 micron, and the width of fringe on close incident opposite is the 20-25 micron.

4. a kind of module of LED-backlit based on LCD TV according to claim 3, it is characterized in that: described reflecting surface has the emission site.

5. a kind of module of LED-backlit based on LCD TV according to claim 4, the quantity that it is characterized in that described concentration piece is a slice.

6. a kind of module of LED-backlit based on LCD TV according to claim 5 is characterized in that: the width of described triangle striped and circular arc type striped increases along with the distance of striped and light source and the mode that increases is exponential increasing.