CN101476684A - Backlight Module and LCD Display - Google Patents

Abstract

A backlight module and a liquid crystal display including the backlight module are provided. The backlight module is provided with a reflecting base, a fluorescent material layer is arranged on the reflecting base, and a plurality of blue light emitting diode assemblies are arranged above the reflecting base and the fluorescent material layer and emit first light beams. The optical film is arranged above the reflecting base, the fluorescent material layer and the blue light LED component and used for allowing P polarized light of the first light beam to penetrate through and reflecting S polarized light of the first light beam to the fluorescent material layer so as to excite the fluorescent material layer to generate a second light beam with different wavelength from the first light beam. When the second light beam is reflected to the optical diaphragm through the reflection base, the second light beam can penetrate through the optical diaphragm and is mixed with the first light beam to generate white light.

Description

Backlight Module and LCD Display

【Technical field】

The invention relates to a backlight module and a liquid crystal display, in particular to a backlight module and a liquid crystal display capable of improving photon utilization.

【Background technique】

Liquid Crystal Display (LCD) is one of the most widely used display technologies at present. The components that make up a liquid crystal display include many optical components, such as polarizers and color filters. Generally speaking, the polarizing plate will cause about 50% of the incident light loss, and the color filter will cause about 60% of the incident light loss. Therefore, when the light passes through these components, only about 20% of the incident light remains, which will cause a loss of the brightness of the backlight module or the liquid crystal display.

Due to rising awareness of environmental protection, white light-emitting diodes (Light-Emitting Diodes; LEDs) have the advantages of small size, high luminance, and mercury-free, and have been gradually applied in backlight modules of liquid crystal displays. White light emitting diodes use blue light emitting diode crystal grains, plus encapsulation colloid containing green and red phosphors; wherein, the encapsulation colloid encapsulates blue light emitting diode crystal grains in a reflective base. When the blue light-emitting diode grain emits blue light, the blue light will excite the green and red phosphors in the encapsulation colloid to generate red light and green light; a part of the red light and green light will be directly reflected to the blue light-emitting diode grain , or first reflected to the reflective base, and then reflected to the blue light-emitting diode grain, and absorbed by the blue light-emitting diode grain; while the other part of the red light and green light will be combined with the blue light penetrating through the packaging colloid, Pass through a polarizer together and mix into white light. As mentioned above, this polarizer also loses about 50% of the amount of light. As shown in Table 1, assuming that the number of blue light photons initially emitted by the blue light-emitting diode grain is 100, after passing through the green and red phosphors, the number of blue light photons is reduced to 50, but the number of red or green photons excited is 40 , the number of blue light photons that are consumed or absorbed is 10; after passing through the polarizing plate, the number of blue light photons is reduced to 25, and the number of red or green light photons is reduced to 20. Therefore, when the existing backlight module or liquid crystal display is used, the utilization rate of the photons of the white light emitting diode after passing through the polarizer is only about 45%.

photon number blu ray red or green light initial 100 N/A After phosphor 50 40 After polarizer 25 20

Table I

【Content of invention】

In view of the low photon utilization rate of a backlight module or a liquid crystal display with a white light emitting diode as a backlight source, the present invention provides a backlight module and a liquid crystal display, which can increase the photon utilization rate of the backlight source to improve the overall performance of the liquid crystal display. brightness.

According to an embodiment of the present invention, the backlight module of the present invention includes: a reflective base, a fluorescent material layer, a plurality of LED components and an optical film. The fluorescent material layer is arranged on the reflective base, and the light emitting diode assembly is arranged above the reflective base and the fluorescent material layer, and emits the first light beam, and the light emitting diode assembly includes a blue light emitting diode. The optical film is arranged above the reflective base, the fluorescent material layer and the light-emitting diode assembly to allow the P-polarized light of the first beam to pass through, and reflect the S-polarized light of the first beam to the fluorescent material layer, A second light beam is generated by exciting the fluorescent material layer, the second light beam has a different wavelength from the first light beam, and after the second light beam is reflected to the optical film by the reflective base, it can pass through the optical film, and the P of the first light beam is different from that of the first light beam. The polarized light mixes to produce white light.

According to another embodiment of the present invention, the first light beam includes light with a wavelength range between 420 nanometers (nm) and 500 nanometers (nm), and the reflectivity of the optical film for S-polarized light ranges between between 80% and 99%, and the transmittance of the optical film to P polarized light ranges between 60% and 99%.

According to another embodiment of the present invention, the fluorescent material layer is a yellow fluorescent material layer, and the wavelength range of the S-polarized light is between 420 nanometers (nm) and 500 nanometers (nm).

According to another embodiment of the present invention, the light emitting diode assembly further includes a green light emitting diode, and the fluorescent material layer is a red fluorescent material layer.

According to another embodiment of the present invention, the light emitting diode assembly further includes green fluorescent powder, and the fluorescent material layer is a red fluorescent material layer.

According to another embodiment of the present invention, the fluorescent material layer includes red fluorescent material and green fluorescent material.

According to another embodiment of the present invention, the optical film includes: a base material, a microprism structure, and an optical material layer. The substrate has a first surface facing the reflective base, and a second surface opposite to the first surface. The microprism structure is arranged on the first surface, and the optical material layer is formed on the second surface. The optical material layer is formed by stacking multiple first dielectric material layers and multiple second dielectric material layers, and the first The optical refraction index of one dielectric material layer is greater than the optical refraction index of the second dielectric material layer.

According to another embodiment of the present invention, the optical film includes: a substrate; and an optical material layer. The optical material layer is formed on the surface of the substrate facing away from the reflective base; wherein, the optical material layer is formed by overlapping multiple first material layers and multiple second material layers, and the first material layer is, for example, made of poly 2, 6 ethylene naphthalate, and the second material layer is made of terephthalate, for example.

According to an embodiment of the present invention, the liquid crystal display of the present invention includes: the aforementioned backlight module, a polarizer and a liquid crystal panel. The polarizing plate is located on the light emitting direction of the backlight module to allow the P-polarized light of the first light beam to pass through, and the liquid crystal panel is arranged on the polarizing plate.

The application of the above-mentioned backlight module and liquid crystal display can effectively increase the photon utilization rate of the backlight source, thereby greatly improving the overall brightness of the liquid crystal display.

【Description of drawings】

In order to make the above and other objects, features, advantages and embodiments of the present invention more obvious and understandable, the detailed description of the accompanying drawings is as follows:

FIG. 1A is a schematic structural diagram of a first embodiment of a backlight module according to the present invention.

FIG. 1B and FIG. 1C are characteristic diagrams of the optical film according to the first embodiment of the present invention.

FIG. 2A is a schematic structural diagram of a second embodiment of a backlight module according to the present invention.

FIG. 2B and FIG. 2C are characteristic diagrams of the optical film according to the second embodiment of the present invention.

FIG. 3 is a schematic structural diagram of a third embodiment of a backlight module according to the present invention.

FIG. 4A is a schematic structural diagram of an embodiment of a liquid crystal display according to the present invention.

FIG. 4B is a schematic structural diagram of another embodiment of a liquid crystal display according to the present invention.

FIG. 5A is a schematic structural diagram of an embodiment of an optical film according to the present invention.

FIG. 5B is a schematic structural diagram of another embodiment of the optical film according to the present invention.

[Description of main component symbols]

60a first surface 60b second surface

61 Optical material layer 62 First material layer

64 Second material layer 66 Microprism structure

70 Optical material layer 72 First dielectric material layer

74 second dielectric material layer 80 backlight module

82 Optical diaphragm 84 Fluorescent material layer

86 Light-emitting diode components 86a Light-emitting diode components

86b Light-emitting diode components 90 LCD panels

D spacing

L ₂ second beam

L ₂₁ second beam

L ₂₂ second beam

P ₁ P polarized light of the first beam

P _1r P polarized reflected light of the first beam

P _1t P-polarized transmitted light of the first beam

S ₁ S polarized light of the first beam

θ tilt angle

【Detailed ways】

The design of the backlight module of the present invention is to place an optical film (for example: a reflective polarized light enhancement film) that can reflect S-polarized light in the blue band, above the light-emitting diode assembly that includes the blue light-emitting diode, to reflect or Partially reflect the S-polarized light of the blue light emitted by the light-emitting diode assembly, and then use this reflected light to excite the phosphor placed on the reflective base to produce red light and/or green light, while red light and/or Or the green light is mixed with the blue light passing through the optical film to form white light.

Various embodiments of the present invention are described below.

first embodiment

Please refer to FIG. 1A , which is a schematic structural diagram of a first embodiment of a backlight module according to the present invention. The backlight module of this embodiment includes: a reflective base 10 , a red fluorescent material layer 20 , a plurality of LED assemblies 30 and an optical film 40 .

The red fluorescent material layer 20 is disposed on the bottom surface or the side surface of the reflective base 10, and the LED assembly 30 is disposed above the reflective base 10 and the red fluorescent material layer 20, and can emit a first light beam P ₁ + S ₁ ; wherein, the light emitting diode assembly 30 is composed of a blue light emitting diode and a green light emitting diode, or a blue light emitting diode and a green phosphor, so as to generate blue light and green light, the wavelength range of the first light beam P ₁ +S ₁ Between 420 nanometers (nm) and 580 nanometers (nm). The optical film 40 is disposed above the reflection base 10 , the red fluorescent material layer 20 and the LED assembly 30 .

There is a distance D between the light emitting diode assembly 30 and the red fluorescent material layer 20, and the range of the distance D is between 0.01 millimeter (mm) and 3 millimeters (mm), so that the red fluorescent material layer 20 can effectively receive the optical film The S-polarized light S ₁ in the first light beam P ₁ +S ₁ reflected by the film 40 , even a small part of the P-polarized light P in the first light beam P ₁ +S ₁ that does not pass through the optical film 40 ₁ .

Please refer to FIG. 1B and FIG. 1C , which illustrate schematic diagrams of the characteristics of the optical film 40 according to the first embodiment of the present invention. As shown in Figure 1B, the horizontal axis represents the wavelength of the S-polarized light emitted by the light-emitting diode assembly 30, in nanometers (nm), and the vertical axis represents the penetration intensity of the S-polarized light, which is zero. Dimensional relative value. The optical film 40 can reflect S-polarized light S ₁ with a wavelength range between 420 nanometers (nm) and 580 nanometers (nm), but allow S-polarized light in other wavelength ranges to pass through; FIG. 1C As shown, the horizontal axis represents the wavelength of the P-polarized light emitted by the light-emitting diode assembly 30, in nanometers (nm), and the vertical axis represents the penetration intensity of the P-polarized light, which is a dimensionless relative value. The optical film 40 can transmit P-polarized light in almost all wavelength ranges. For the first light beam P ₁ +S ₁ with a wavelength range between 420 nanometers (nm) and 580 nanometers (nm), the optical film 40 controls the S polarized light S ₁ of the first light beam P ₁ +S ₁ The reflectivity ranges between 80% and 99%, and the transmittance of the optical film 40 to the P-polarized light _P1 of the first light beam _P1 + _S1 ranges between 60% and 99%. between.

Therefore, as shown in FIG. 1A , the optical film 40 can allow part or all of the P-polarized light P ₁ of the first light beam P ₁ +S ₁ to pass through, and reflect part or all of the first light beam P ₁ +S ₁ All the S polarized light S ₁ is sent to the red fluorescent material layer 20 to excite the red fluorescent material layer 20 to generate a second light beam (red light) L ₂ , the second light beam (red light) L ₂ and the first light beam (blue light) And the wavelength of green light) P ₁ +S ₁ is different. When part of the second light beam (red light) L ₂ is emitted to the optical film 40 by the red fluorescent material layer 20, or partly reflected to the optical film 40 by the reflective base 10, it can penetrate the optical film 40 and communicate with the optical film 40. The P-polarized light _P1 of the first light beam (blue light and green light) is mixed to produce white light.

second embodiment

Please refer to FIG. 2A , which is a schematic structural diagram of a second embodiment of a backlight module according to the present invention. The backlight module of this embodiment includes: a reflective base 10 , a fluorescent material layer 22 including red fluorescent materials and green fluorescent materials, a plurality of LED components 32 and an optical film 42 .

The fluorescent material layer 22 is disposed on the bottom surface or the side surface of the reflective base 10, and the LED assembly 32 is disposed above the reflective base 10 and the fluorescent material layer 22, and can emit a first light beam P ₁ +S ₁ ; wherein, the light emitting diode assembly 32 is composed of blue light emitting diodes, and the wavelength range of the first light beam P ₁ +S ₁ is between 420 nanometers (nm) and 500 nanometers (nm). The optical film 42 is disposed above the reflection base 10 , the fluorescent material layer 22 and the LED assembly 32 . There is a distance D between the LED assembly 32 and the fluorescent material layer 22, and the range of the distance D is between 0.01 millimeter (mm) and 3 millimeters (mm), so that the fluorescent material layer 22 can effectively receive the optical film 42 The reflected S-polarized light S ₁ in the first light beam P _{1 +} S ₁ is even a small part of the P-polarized light P 1 in the first light beam P ₁ +S ₁ that does not pass through the optical film 42 .

Please refer to FIG. 2B and FIG. 2C , which illustrate characteristic diagrams of the optical film 42 according to the second embodiment of the present invention. As shown in Figure 2B, the horizontal axis represents the wavelength of the S-polarized light emitted by the light-emitting diode assembly 32, in nanometers (nm), and the vertical axis represents the penetration intensity of the S-polarized light, which is a factorless second relative value. The optical film 42 can reflect the S-polarized light S ₁ with a wavelength range between 420 nanometers (nm) and 500 nanometers (nm), but allow the S-polarized light in the rest of the wavelength range to pass through; as shown in FIG. 2C As shown, the horizontal axis represents the wavelength of the P-polarized light emitted by the LED assembly 32 in nanometers, and the vertical axis represents the penetration intensity of the P-polarized light, which is a dimensionless relative value. The optical film 42 can transmit P-polarized light in almost all wavelength ranges. For the first light beam P ₁ +S ₁ with a wavelength range between 420 nanometers (nm) and 500 nanometers (nm), the optical film 42 controls the S-polarized light S ₁ of the first light beam P ₁ +S ₁ The reflectivity ranges between 80% and 99%, and the transmittance of the optical film 42 to the P-polarized light _P1 of the first light beam _P1 + _S1 ranges between 60% and 99%. between.

Therefore, as shown in FIG. 2A , the optical film 42 can allow part or all of the P-polarized light P ₁ of the first light beam P ₁ +S ₁ to pass through, and reflect part or all of the first light beam P ₁ +S ₁ All the S polarized light S ₁ is sent to the fluorescent material layer 22 to excite the fluorescent material layer (red and green fluorescent materials) 22 to generate a second light beam (red light and green light) L 2 , the second light beam (red light and green light) L ₂ , the second light beam (red light and green light) Green light) L ₂ has different wavelengths from the first light beam (blue light) P ₁ +S ₁ . When the second light beam (red light and green light) _L2 is partially emitted from the fluorescent material layer 22 to the optical film 42, or partly reflected to the optical film 42 by the reflective base 10, it can pass through the optical film 42, While mixing with P-polarized light _P1 of the first light beam (blue light) produces white light.

third embodiment

Please refer to FIG. 3 , which shows a schematic structural diagram of a third embodiment of a backlight module according to the present invention. In this embodiment, the yellow fluorescent material layer 24 is used to replace the fluorescent material layer (red and green fluorescent materials) 22 of the second embodiment of the present invention, and the wavelength range of the reflected S-polarized light _S1 is also between 420 nanometers ( nm) and 500 nanometers (nm), and the arrangement and characteristics of other components are the same as those of the second embodiment, please refer to the second embodiment of the present invention, and will not repeat them here.

The first light beams P ₁ +S ₁ in the first, second and third embodiments of the present invention all contain blue light, and the wavelength range of the strongest intensity is between 440 nanometers (nm) and 490 nanometers (nm).

Various embodiments of the present invention are described below, which adjust or achieve the white balance of the liquid crystal display or the technical means of the white balance specification.

method one

Please refer to FIG. 4A , which is a schematic structural diagram of an embodiment of a liquid crystal display according to the present invention. The liquid crystal display of this embodiment includes a backlight module 80, a polarizing plate 50 and a liquid crystal panel 90; wherein, the fluorescent material layer 84, the light emitting diode assembly 86 and the optical film 82 that make up the backlight module 80 can be the aforementioned first embodiment, the first embodiment Any one of the second embodiment and the third embodiment. The liquid crystal panel 90 is arranged on the polarizing plate 50, and the polarizing plate 50 is located in the light emitting direction of the backlight module 80, and the polarizing plate 50 can allow most of the P polarizing poles of the first light beam P ₁ + S ₁ passing through the optical film 82 The P polarized transmitted light P _1t in the photon light P ₁ passes through, and its transmission loss rate is less than 5%. The polarizer 50 can also allow part of the second light beams (red light, red light and green light or yellow light) L ₂₁ and L ₂₂ to pass through, and the transmission loss rate is about 50%. The second light beam _L21 is generated by exciting the fluorescent material layer ₈₄ with a small amount of P-polarized reflected light P1r in the P-polarized light _P1 of the first light beam _P1 + _S1 , and the P-polarized reflected light _P1r Then it is a small amount of P-polarized light of the part of the first light beam P ₁ +S ₁ reflected by the optical film 82 . The second light beam _L22 is generated by the S-polarized light _{S1 of the first light beam P1+S1 exciting the} fluorescent material layer 84, and the S-polarized light _S1 is the first light beam reflected by the optical film 82 S polarized light of P ₁ +S ₁ .

In order to achieve the white balance of the liquid crystal display, in this embodiment, the ratio of P polarized light reflected by the optical film 82 is controlled, that is, P _1r /(P _1r +P _1t ), to adjust the first excitation generated by the fluorescent material layer 84. Intensities of the two light beams L ₂₁ and L ₂₂ . For example, if P _1r /(P _1r +P _1t ) is low, it indicates that the proportion of P-polarized penetrating light P _1t passing through is high, so that the color is bluish and the color temperature is high.

Method Two

Please refer to FIG. 4B , which is a schematic structural diagram of another embodiment of a liquid crystal display according to the present invention. The light-emitting surface of the light-emitting diode assembly 86 in method one all faces the optical film 82, while the light-emitting surface of part of the light-emitting diode assembly 86a in this embodiment faces the optical film 82, and the light-emitting surface of the other part of the light-emitting diode assembly 86b faces the fluorescent light. material layer 84 . In this embodiment, when the number of LED components 86b is larger, the first light beam L1 that can directly excite the fluorescent material layer 84 is stronger, thus generating stronger second light beams (red light, red light and green light or Yellow light) L ₂₁ and L ₂₂ . Therefore, in this method, the white balance of the liquid crystal display can be achieved by adjusting the ratio of the numbers of the LED components 82 a to the LED components 82 b. In this embodiment, the ratio range of the numbers of the LED components 82 a to the LED components 82 b is preferably between 2:1 and 99:1. Wherein, if the total number of LED assemblies 82 is 300, the number of LED assemblies 82b with a ratio of 2:1 is 100, and the number of LED assemblies 82b with a ratio of 99:1 is 3, so the second light beam L ₂₁ produced by the former and L ₂₂ are stronger, so that the color of the former is reddish or greenish, and the color temperature is lower.

The effects of various embodiments of the present invention are described below.

As shown in Table 2, Table 2 shows the results of reflecting only the S-polarized light S ₁ of the first light beam P ₁ +S ₁ according to the second and third embodiments of the present invention. Assuming that the number of blue light photons initially emitted by the light-emitting diode assembly 32 is 100, after passing through the optical film, the number of blue light photons passing through the optical film 42 is 47, and the number of blue light photons reflected by the optical film 42 is 47; After the blue light reflected by sheet 42 excites the fluorescent material layers 22 and 24, the total number of photons of red light and green light (or yellow light) generated is 40; if it passes through the polarizing plate, the number of photons of blue light will only be slightly reduced to 45 , while the total photon number of red light and green light (or yellow light) is reduced to 20. Therefore, when various embodiments of the present invention are applied, the utilization rate of photons passing through the polarizing plate can reach 65%.

photon number blu ray red and green light initial 100 N/A After optical film 47(pass through); 47(reflect) N/A After phosphor 47 40 After polarizer 45 20

Table II

As shown in Table 3, Table 3 is the second and third embodiments of the present invention and reflects 25% of the P polarized light P ₁ of the first light beam P ₁ +S ₁ (that is, the application of method one), to adjust the white balanced result. Assuming that the number of blue light photons initially emitted by the light-emitting diode assembly 32 is 100, after passing through the optical film 42, the number of blue light photons passing through the optical film 42 is 35, and the number of blue light photons reflected by the optical film 42 is 59; The number of photons of red light and green light (or yellow light) produced after the blue light reflected by the diaphragm 42 excites the fluorescent material layers 22 and 24 is 52; The total number of photons of red light and green light (or yellow light) is reduced to 26. Therefore, when the embodiment of the present invention is applied, the utilization rate of the photons passing through the polarizing plate 50 can reach 59%.

photon number blu ray red and green light initial 100 N/A After optical film 35 (through); 59 (reflection) N/A

After phosphor 35 52 After polarizer 33 26

Table three

The fabrication methods of the optical films 40 and 42 in various embodiments of the present invention are described below.

Please refer to FIG. 5A , which shows a schematic structural view of an embodiment of the optical films 40 , 42 , 82 according to the present invention. The optical films 40 , 42 , 82 of this embodiment are composed of a substrate 60 , a microprism structure 66 and an optical material layer 70 . The substrate 60 has a first surface 60 a facing the reflective base 10 and a second surface 60 b opposite to the first surface 60 a.

The microprism structure 66 is disposed on the first surface 60a, and its prism height ranges between 0.01 millimeter (mm) and 3 millimeters (mm), and has an inclination angle θ, which ranges between 10° and 65° , used to control the angle of light incident on the optical film 40 , 42 , 82 . The optical material layer 70 is formed on the second surface 60b, and is composed of a plurality of first dielectric material layers 72 and a plurality of second dielectric material layers 74 stacked alternately, the present invention is not limited to the first dielectric material layer The stacking sequence of the layer 72 and the second dielectric material layer 74; wherein, the optical refraction index of the first dielectric material layer 72 is greater than the optical refraction index of the second dielectric material layer.

The first dielectric material layer 72 can be made of, for example: magnesium oxide (MgO), zinc oxide (ZnO), silicon nitride (SiN _x ), silicon oxynitride (SiON _x ), titanium oxide (TiO ₂ ), zinc selenide (ZnSe ), zinc sulfide (ZnS), tantalum oxide (TaO _x ), aluminum oxide (Al ₂ O ₃ ), tellurium oxide (TeO _x ), indium tin oxide (ITO) or a combination thereof, and its thickness ranges from Between 5 nanometers (nm) and 90 nanometers (nm).

The second dielectric material layer 74 can be made of, for example, silicon oxide (Si ₂ O ₃ ), magnesium fluoride (MgF ₂ ), silicon oxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), tellurium oxide (TeO _x ), Made of lithium fluoride (LiF), silicon oxynitride (SiON _x ) or a combination thereof, the thickness range is between 10 nanometers (nm) and 130 nanometers (nm).

The optical films 40, 42, and 82 of this embodiment utilize the incident angle of the incident light near the Brewster angle (Brewster angle), and have the characteristics of reflecting S polarized light and penetrating P polarized light to achieve The purpose of separating the two polarized lights; and by adjusting the number of layers of the two dielectric material layers 72, 74 and the inclination angle of the microprism structure 66, to control the respective penetration and sum of the S polarized light and the P polarized light reflection ratio; and adjust the polarization band by adjusting the thicknesses of the two high and low optical refractive index dielectric material layers 72 and 74 .

Please refer to FIG. 5B , which shows a schematic structural view of another embodiment of the optical film 40 , 42 , 82 according to the present invention. The optical films 40 , 42 , 82 of this embodiment are composed of a base material 60 and an optical material layer 61 . The optical material layer 61 is formed on the second surface 60 b of the substrate 60 facing away from the reflective base 10 . The optical material layer 61 is formed by stacking multiple first material layers 62 and multiple second material layers 64 alternately, and the present invention does not limit the stacking sequence of the first material layers 62 and the second material layers 64 .

The first material layer 62 is made of, for example, polyethylene 2,6 naphthalate (PEN; 2,6-polyethylenenaphthalate), and its thickness ranges between 10 nanometers (nm) and 130 nanometers (nm). The second material layer 64 is, for example, made of terephthalate (co-PEN), and its thickness ranges between 5 nanometers (nm) and 110 nanometers (nm). Since terephthalate is a material that changes the optical refractive index in the stretching direction due to stress stretching, the amount of change will also vary with the degree of stretching, so it can be passed through two perpendicular directions The amount of stretching is used to change the optical refraction index, and then adjust the reflection amount of polarized light. In addition, adjusting the thicknesses of the two optical material layers 62 and 64 can also adjust the reflected wavelength band.

From the above embodiments of the present invention, it can be seen that the advantage of applying the present invention is that the photon utilization rate of the backlight source can be increased, thereby greatly improving the overall brightness of the liquid crystal display.

Although the present invention has been disclosed above in terms of implementation, it is not intended to limit the present invention. Anyone skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall prevail as defined in the scope of the appended patent application.

Claims (12)

1. backlight module comprises:

One reflection pedestal;

One fluorescent material layer is arranged on this reflection pedestal;

A plurality of light-emitting diode components are arranged on the top of this reflection pedestal and this fluorescent material layer, and launch one first light beam, and each described light-emitting diode component comprises a blue light-emitting diode; And

One blooming piece is arranged on the top of this reflection pedestal, this fluorescent material layer and described light-emitting diode component, in order to allowing the P polarization light of this first light beam penetrate, and reflects the S polarization light of this first light beam;

Wherein, this fluorescent material layer is produced one second light beam by this first beam excitation, this second light beam and this first light beam different wave length produce white light to mix with this first light beam, and the wave-length coverage that intensity is the strongest in this first light beam are between 440 nanometers and 490 nanometers.

2. backlight module according to claim 1 is characterized in that, this fluorescent material layer is a yellow fluorescent material layer, and this S polarization light wavelength scope is between 420 nanometers and 500 nanometers.

3. backlight module according to claim 1, it is characterized in that, each described light-emitting diode component comprises a green light LED in addition, and this fluorescent material layer is a red fluorescence material layer, and this S polarization light wavelength scope is between 420 nanometers and 580 nanometers.

4. backlight module according to claim 1, it is characterized in that, each described light-emitting diode component comprises green emitting phosphor in addition, and this fluorescent material layer is a red fluorescence material layer, and this S polarization light wavelength scope is between 420 nanometers and 580 nanometers.

5. backlight module according to claim 1 is characterized in that this fluorescent material layer includes red fluorescence material and green fluorescent material, and this S polarization light wavelength scope is between 420 nanometers and 500 nanometers.

6. backlight module according to claim 1 is characterized in that, this blooming piece comprises:

One base material has towards a first surface of this reflection pedestal, an and second surface relative with this first surface;

One little water chestnut mirror structure is arranged on this first surface; And

One optical material layer, be formed on this second surface, this optical material layer is by at least one first dielectric materials layer and staggered stacked the forming of at least one second dielectric materials layer, and the light refraction coefficient of this first dielectric materials layer is greater than the light refraction coefficient of this second dielectric materials layer.

7. backlight module according to claim 6, it is characterized in that, this first dielectric materials layer is selected from by magnesia, zinc oxide, silicon nitride, silicon oxynitride, titanium oxide, zinc selenide, zinc sulphide, tantalum oxide, aluminium oxide, tellurium oxide, the group that indium tin oxide and combination thereof are formed, and this second dielectric materials layer is selected from by silica, magnesium fluoride, silica, aluminium oxide, tellurium oxide, lithium fluoride, the group that silicon oxynitride and combination thereof are formed, the thickness range of this first dielectric materials layer is between 5 nanometers and 90 nanometers, and the thickness range of this second dielectric materials layer is between 10 nanometers and 130 nanometers.

8. backlight module according to claim 1 is characterized in that, this blooming piece comprises:

One base material; And

One optical material layer, be formed at this base material dorsad on the surface of this reflection pedestal, wherein optical material layer is by at least one first material layer and staggered stacked the forming of at least one second material layer, this first material layer is by poly-2,6 (ethylene naphthalate)s are made, and this second material layer is made by terephthalate, and the thickness range of this first material layer is between 10 nanometers and 130 nanometers, and the thickness range of this second material layer is between 5 nanometers and 110 nanometers.

9. backlight module according to claim 1 is characterized in that, this blooming piece is a reflection-type polarisation brightening piece.

10. backlight module according to claim 1 is characterized in that, the exiting surface of the described light-emitting diode component of part is towards this blooming piece, and the exiting surface of the described light-emitting diode component of another part is then towards this fluorescent material layer.

11. backlight module according to claim 1 is characterized in that, described light-emitting diode component and this fluorescent material layer have a spacing apart, and the scope of this spacing is between 0.01 millimeter and 3 millimeters.

12. a LCD comprises:

One backlight module according to claim 1;

One Polarizer is positioned on the light direction of this backlight module; And

One liquid crystal panel is disposed on this Polarizer.

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