CN100412642C - Backlight component - Google Patents

Abstract

A backlight assembly disposed below a display panel includes: the light source generator comprises a light guide plate and a light source generator which is arranged on a first side surface of the light guide plate and used for providing a light source. The light guide plate comprises a first reflection film coated on a bottom surface of the light guide plate and used for reflecting the light source generated by the light source generator, and the light guide plate is used for scattering the reflected light source to the display panel through a top surface of the light guide plate.

Description

Backlight component

technical field

The invention relates to a backlight unit (BLU), in particular to a backlight unit coated with a light guide plate (LGP) with a reflective film.

Background technique

Backlight components are one of the key components of liquid crystal display products, and have been widely used in digital cameras, digital personal assistants (PDAs), satellite navigation systems, computer monitors and flat-screen TVs. Generally speaking, the backlight assembly is arranged under a display panel (display panel), and has a light source generator (light source generator) and a diffusing plate (diffusing plate), in order to provide a uniformly dispersed light to the display panel, and then form appropriate images by controlling the pixel electrodes on the display panel. Wherein, the backlight assembly can be divided into a direct illuminance backlight assembly in which the light source is directly below the display panel or an edge light backlight assembly in which the light source is near the side of the display panel according to the location of the light source. Since the edge-lit backlight assembly arranges the light source generator on the side of the light guide plate, it can be applied to products requiring a smaller size.

Referring to FIG. 1 , FIG. 1 is a schematic cross-sectional view of a known edge-lit backlight unit (back light unit, BLU) 10 . As shown in Figure 1, the backlight assembly 10 is arranged under a display panel (display panel) 11, and the backlight assembly 10 includes a light guide plate (light guide plate, LGP) 12, a light source located on the side of the light guide plate 12 generates device 14, a reflective sheet (reflecting sheet) 15 arranged below the light guide plate 12, a diffuser sheet 16 arranged above the light guide sheet 12, at least one prism (prism) 18 arranged on the surface of the diffuser sheet 16 and a device A housing 20 is located below the light guide plate 12 and covers the surroundings of the light guide plate 12 and the light source generator 14 .

The light source generator 14 is used to provide a light source, and the reflection plate 15 is used to reflect the light source generated by the light source generator 14 upwards to the light guide plate 12 . The light guide plate 12 can scatter the reflected light source upward to the diffuser plate 16, and includes at least one patterned bump (bump) 22, thereby destroying the total reflection of the light in the light guide plate 12 phenomenon, so that the light source is uniformly scattered upward to the diffuser plate 16, and further diffused to the display panel 11, while the reflective plate 15 is a metal plate made of silver, aluminum or other materials with high reflectivity properties. The diffuser plate 16 is used to further diffuse the light source to the display panel 11 through the prism 18 , and use the prism 18 to correct the difference in intensity of the light source during the process. Generally speaking, the display panel 41 is a liquid crystal display panel (liquid crystal display panel, LCD panel), and the light source generator 44 is a light emitting diode (light emitting diode, LED) tube or a cold cathode fluorescent tube ( cold cathode fluorescent lamp, CCFL).

However, as shown in FIG. 1 , the design of the known backlight assembly 10 will form a medium (medium) between the light guide plate 12 and the reflector 15 as an accommodation chamber 24 of air, in addition to increasing the volume of the product and improving the performance of the backlight assembly 10. In addition to the difficulty of assembly, it will also cause energy loss of the light source and reduce the light utilization efficiency of the backlight assembly 10 . What's more serious is that under the known backlight assembly 10 operating for a long time, the reflection plate 15 formed by the metal plate inside it tends to be slightly distorted and deformed due to heat, resulting in a decrease in the flatness of the surface of the reflection plate 15 and consequently causing The reflected light source cannot have a uniform illumination intensity when it is further scattered to the display panel 11 , which is commonly known as a “wave phenomenon”. This wave of vibration is enough to cause flaws in the display quality of the display panel 11 , resulting in a sharp drop in product competitiveness.

Contents of the invention

The object of the present invention is to provide a backlight assembly with less gas medium inside, so as to avoid the wave phenomenon caused by the above known backlight assembly.

In a preferred embodiment of the present invention, the backlight assembly is disposed under a display panel. The backlight assembly includes a light guide plate (LGP) and a light source generator (light source generator) disposed on a first side of the light guide plate, and the light guide plate includes a light guide plate coated on the light guide plate The first reflective film on the bottom surface. The light source generator is used to provide a light source, the first reflective film is used to reflect the light source upwards, and the light guide plate is used to scatter the reflected light source to the light source through a top surface of the light guide plate. The display panel. In addition, the backlight assembly also includes a diffusing plate and at least one prism arranged on the light guide plate in sequence, and a diffuser plate arranged under the light guide plate and covering the light guide plate and the light guide plate. The housing around the light source generator.

Since the backlight assembly of the present invention utilizes the first reflective film and a second reflective film coated on the bottom surface, a second side, a third side, and a fourth side of the light guide plate to reflect upwardly from the light source The light source generated by the generator can omit the known reflective sheet (reflecting sheet). This improvement in design can avoid the known phenomenon of "wave vibration" which is enough to greatly reduce the display quality of the product due to distortion and deformation of the reflector under long-term operation. In addition, since the first reflective film and the second reflective film are coated on the surface of the light guide plate, it can not only reduce the energy loss of the light source due to the air medium (medium), but also improve the light utilization of the backlight assembly. It also has the double effect of reducing the product size and simplifying the assembly process and cost, thereby greatly enhancing the competitiveness of the product in the market.

Description of drawings:

FIG. 1 is a schematic cross-sectional view of a conventional backlight assembly.

FIG. 2 is a schematic cross-sectional view of the backlight assembly of the present invention.

FIG. 3 is a three-dimensional enlarged schematic view of the light guide plate 42 in FIG. 2 .

FIG. 4 is a schematic cross-sectional view of the light guide plate 42 in FIG. 3 along the a-a axis.

Explanation of symbols of attached parts and components:

10 backlight assembly 11 display panel

12 Light guide plate 14 Light source generator

15 reflector 16 diffuser

18 Prism 20 Housing

22 convex mirror 24 chamber

40 backlight assembly 41 display panel

42 light guide plate 42a first side

42b Bottom 42c Top

42d second side 42e third side

42f fourth side 44 light source generator

46 diffuser plate 48 prism

50 Shell 52 First reflection film

54 second reflective film 56 recessed structure

58 bumps

Detailed ways

Referring to FIG. 2, FIG. 2 is a schematic cross-sectional view of an edge light (edge light) backlight assembly (back light unit, BLU) 40 of the present invention. As shown in Figure 2, the backlight assembly 40 is arranged under a display panel (displaypanel) 41, and the backlight assembly 40 includes: a light guide plate (light guide plate, LGP) 42, a first side that is located at the light guide plate 42 A light source generator (light source generator) 44 of 42a, a diffusing plate (diffusing plate) 46 located on the top of the light guide plate 42, at least one prism (prism) 48 located on the surface of the diffusing plate 46 and one located on the light guide plate 42 and covers the housing 50 around the light guide plate 42 and the light source generator 44 .

The light source generator 44 is generally a lamp tube used to provide a light source, and the light guide plate 42 includes a bottom surface (bottom surface) 42b coated on the light guide plate 42 for upward reflection (reflect) by the light source generator 44 The generated first reflective film (first reflecting film) 52 of the light source can scatter the light source reflected by the first reflective film 52 to the diffuser plate 46 through a top surface (top surface) 42c. The diffuser 46 is used for further scattering the light source to the display panel 41 through the prism 48 , and the prism 48 is used for correcting the difference in intensity of the light source. In a preferred embodiment of the present invention, the display panel 41 is a liquid crystal display panel (liquid crystal display panel, LCD panel), and the light source generator 44 is a light emitting diode (light emitting diode, LED) tube or a cold cathode fluorescent lamp. Light tube (cold cathode fluorescent lamp, CCFL). The first reflective film 52 is a metal film made of silver, aluminum or other high reflective materials, and the bottom surface 42b of the light guide plate 42 is a slope not parallel to the top surface 42c to enhance the reflection of the light source. On the other hand, in order to reduce the size of the product and facilitate portability, the bottom surface 42b of the light guide plate 42 can also be a plane (not shown) that is flat with the top surface 42c.

Referring to FIG. 3 , FIG. 3 is an enlarged perspective view of the light guide plate 42 in FIG. 2 . As shown in FIG. 3 , based on product requirements, the light guide plate 42 may also include a first reflective film 52 coated on the bottom surface 42b of the light guide plate 42, and a second reflection film 52 coated on a side opposite to the first side 42a. On two side surfaces 42d and a third side surface 42e perpendicular to the second side surface 42a and the top surface 42c and a fourth side surface 42f, the second reflection film ( secondreflecting film) 54, to strengthen the upward reflection of the light source generated by the light source generator 44. It is worth mentioning that since the reflection of the light source is mainly performed by the first reflective film 52 coated on the bottom surface 42b of the light guide plate 42, the second reflective film 54 can also be omitted based on the consideration of manufacturing cost. Or only coat the second reflective film 54 on one or both of the second side 42d, the third side 42e and the fourth side 42f.

Referring to FIG. 4 , FIG. 4 is a schematic cross-sectional view of the light guide plate 42 in FIG. 3( b ) along the a-a axis. As shown in FIG. 4 , the bottom surface 42 b coated with the first reflective film 52 of the light guide plate 42 and the second side 42 d coated with the second reflective film 54 , the third side 42 e (not shown in FIG. 4 ) and the first reflective film 54 are connected to each other. The four sides 42f (not shown in FIG. 4 ) also include at least one patterned recess (recess) structure 56, each recess structure 56 will be coated with the first reflective film 52 and the process of the second reflective film 54 The center is filled by the first reflective film 52 and the second reflective film 54 to form a patterned bump (bump) 58 . Utilizing its own pattern and curvature, the bump 58 can modify the light source when it reflects the light source, so that the light source is more uniformly reflected to the top surface 42 c of the light guide plate 42 and further diffused to the display panel 41 . In a preferred embodiment of the present invention, both the recessed structure 56 and the protruding block 58 have a dot shape; however, in other embodiments of the present invention, the recessed structure 56 and the protruding block 58 may have a crossed or parallel V shape. structure can also achieve the same effect.

As mentioned above, considering the volume of the product, the bottom surface 42b of the light guide plate 42 can also be a plane parallel to the top surface 42c, but because this design will not greatly affect the function of the light guide plate 42, and has the parallel to the top surface The detailed structure and functions of the light guide plate 42 on the bottom surface of the surface 42c are also the same as those of the light guide plate 42 with the bottom surface 42b not parallel to the top surface 42c in the preceding paragraphs, so details are not described here.

Compared with the known backlight assembly 10 in FIG. 1, the backlight assembly 40 of the present invention utilizes the first reflective film 52 coated on the bottom surface 42b, the second side 42d, the third side 42e and the fourth side 42f of the light guide plate 42. The light source generated by the light source generator 44 is upwardly reflected with the second reflective film 54, so the known reflective plate (reflecting sheet) 15 can be omitted. This improvement in design can avoid the known "wave phenomenon" caused by distortion and deformation of the reflector 15 under long-term operation, which is enough to greatly reduce the display quality of the product. In addition, since the first reflective film 52 and the second reflective film 54 are directly coated on the bottom surface 42b of the light guide plate 42, there is no space between the light guide plate 42 and the first reflective film 52, which not only reduces the The energy loss of the light source due to the air medium (medium) can improve the light utilization efficiency of the backlight assembly 40, and can also receive the dual effects of reducing the product volume and simplifying the assembly process and cost, thereby greatly enhancing the competitiveness of the product in the market .

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the claims of the present invention shall fall within the scope of the claims of the present invention.

Claims (4)

1. backlight assembly, this backlight assembly are located at display panel below, and this backlight assembly comprises:

One light guide plate, this light guide plate comprises:

Be coated on one first reflective film of the bottom surface of this light guide plate; And

One is located at the light source generator of one first side of this light guide plate, and this first reflective film in order to the reflection by the light that this light source generator produced, this light guide plate then makes this reflected light scatter to this display panel via an end face of this light guide plate,

This bottom surface of this light guide plate comprises at least one patterned first depression,

This first reflective film comprises one by inserting patterned first projection that this first this first reflective film that caves in is constituted.

2. backlight assembly as claimed in claim 1, it is characterized in that: this light guide plate also comprises at least one second reflective film, this second reflectance coating is coated on this first side, this bottom surface and this end face plane in addition of this light guide plate, in order to reflect the light that this light source generator produces.

3. backlight assembly as claimed in claim 2 is characterized in that: this first reflective film and this second reflective film are one by film that silver or aluminium constituted.

4. backlight assembly as claimed in claim 2, it is characterized in that: each the described plane that is coated with this second reflective film on this light guide plate comprises at least one patterned second depression, and this second reflective film comprises one by inserting patterned second projection that this second this second reflective film that caves in is constituted.

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