TWM565320U - Light guide film, backlight module and display device - Google Patents

Abstract

A light guiding film, a backlight module and a display device, the backlight module comprises a light guiding film, a light source and an optical film, and the display device comprises a backlight module and a display panel, wherein the light guiding film utilizes light emitted from the light guiding substrate The first light-adjusting body and the second light-adjusting body of the main light-adjusting layer of the surface or the bottom surface have the characteristics of absorbing the color of the converted light of the wavelength light of different colors, so that the light is incident on the light-input side of the light-guide substrate toward the opposite side When transmitting in the light-in direction, the first light-adjusting body and the second light-adjusting body segmentally absorb light of different colors, suppressing yellowing caused when light is transmitted through the light-guide substrate, and effectively blending light from the light-incident side. The chromatic aberration between the opposite light incident sides allows the chromatic aberration emitted by the light guiding film to be adjusted to a better state.

Description

Light guiding film, backlight module and display device

The present invention relates to a light guiding film, a backlight module and a display device applied to a display such as a liquid crystal display.

In an existing display device such as a liquid crystal display (LCD), since the display panel does not have the characteristics of active illumination, it is necessary to provide a backlight for the display panel through a backlight unit (BLU).

A conventional backlight assembly includes a light guide plate (or a light guide film), a light source disposed on a light incident side of the light guide plate (or the light guide film), and a light guide plate (or a light guide film) At least one optical film is disposed outside the light-emitting surface. Thereby, the light emitted by the light source is incident on the light incident side of the light guide plate (or the light guide film) into the light guide plate (or the light guide film), and the total reflection function of the light guide plate (or the light guide film) is used to make the incident light. The light is transmitted toward the light-receiving side of the light guide plate, and the light is diffused and deflected to be emitted by the light-emitting surface, and then diffused or brightened by the optical film to provide a uniform brightness of the display panel. source.

Among the many known display devices, some display devices use the light guiding film of the backlight module to change the light exiting angle and light directivity of the light emitted from the light guide plate, thereby providing desired brightness and uniformity of light output. However, when the light passes through the total reflection and scattering inside the light guiding film, the light is reflected from the light entering side of the light guiding film toward the reverse light side due to the different reflection rates of the light contained in the light in the light guiding film. When the direction is transmitted, the yellowing phenomenon becomes more and more obvious, and the surface light source that causes the light source to guide the light through the light guiding film exhibits a significant chromatic aberration.

The purpose of the present invention is to provide a light guiding film, a backlight module and a display device, which solve the problem of light yellowing after the light passes through the existing light guiding film.

In order to achieve the foregoing object, the light guiding film of the present invention comprises: a light guiding substrate, wherein the front and rear opposite sides are respectively a light emitting surface and a bottom surface, and the light emitting surface and one side of the bottom surface Having a light incident side, the light emitting surface and the bottom surface are opposite to the other side of the light incident side, and the light guiding substrate defines a first dimming area and a second dimming area. The first dimming zone and the second dimming zone are sequentially arranged from the light incident side toward the opposite light entering side; and a main dimming layer is formed on the light emitting surface of the light guiding substrate and The main dimming layer includes a first dimming body and a second dimming body, and the first dimming body and the second dimming body are respectively disposed in the first dimming area And the second dimming zone, and the first dimming body and the second dimming body have characteristics of absorbing wavelength light of different colors.

In the light guiding film as described above, the light guiding film further includes a primary light adjusting layer formed on one of a light emitting surface and a bottom surface of the light guiding substrate, and the secondary light adjusting layer is formed. And the other of the light-emitting surface and the bottom surface of the light-guiding substrate, the secondary light-adjusting layer includes a primary light-modulating body, wherein the secondary light-modulating body is disposed in the first dimming region, the second dimming region, or In combination, the secondary light modulating body is a member having the same material as the first light modulating body or the second light modulating material.

In the light guiding film as described above, the light guiding film further includes a primary light adjusting layer formed on one of a light emitting surface and a bottom surface of the light guiding substrate, and the secondary light adjusting layer is formed. The other of the light-emitting surface and the bottom surface of the light-guiding substrate, the secondary light-adjusting layer includes a first light-adjusting body and a second-time light-adjusting body, the first light-adjusting body and the first The second light modulating body is respectively disposed on the first light modulating area and the second light modulating area, wherein the first light modulating body is a component having the same material as the first light modulating material, and the second light modulating The body is a member having the same material as the second light body material.

In the light guiding film as described above, the first light modulating body and the second light modulating system of the main light modulating layer are respectively formed of ultraviolet (Ultraviolet, UV) hardened rubber.

In the light guiding film as described above, the light guiding substrate is a member formed of a polyethylene terephthalate (PET) material.

In the light guiding film as described above, the light guiding substrate is a member formed of polyethylene terephthalate (PET) material, and the first light adjusting body and the second dimming layer of the light adjusting layer The system is a component formed by ultraviolet (Ultraviolet, UV) hardened rubber.

By exposing the creation of the light film, the first light-adjusting body and the second light-adjusting body in the main light-adjusting layer of the light-emitting surface or the bottom surface of the light-guiding substrate are used to absorb the light of different wavelengths. The characteristic of the color is such that when the light is transmitted from the light incident side of the light guiding substrate toward the opposite light entering side, the first light modulating body and the second light modulating body are used to absorb the wavelength light of different colors to suppress the light. The yellowing generated when the light guiding substrate is transferred, thereby modulating the chromatic aberration of the light from the light entering side to the light entering side, so that the chromatic aberration emitted by the light guiding film can be adjusted to a better state.

The front light film may further comprise a primary light adjustment layer, wherein the primary light adjustment layer and the secondary light adjustment layer are respectively disposed on the light emitting surface and the bottom surface of the light guiding substrate, and the secondary light adjusting layer and the main light adjusting layer are both absorbing different colors. The wavelength light transforms the color characteristics of the light, thereby providing a double harmonic chromatic aberration by using the main dimming layer and the sub-dimming layer in the process of transmitting light from the light incident side of the light guiding substrate toward the opposite light entering side. The function is to make the chromatic aberration emitted by the light guiding film more suitable to a better state.

In order to achieve the foregoing, the backlight module of the present invention further comprises: a light guiding film as described above; a light source disposed on a light incident side of the light guiding film to provide light having a chromaticity of a light source; At least one optical film is disposed in front of the light guiding film.

In order to achieve the foregoing, the display device of the present invention further comprises: a backlight module as described above; and a display panel disposed in front of the optical film of the backlight module.

By creating a backlight module and a display device, the light after the color difference is adjusted to provide a diffusion or increase through the optical film of the backlight module, except that the color difference of the light emitted by the light film is adjusted to a better state. When the optical performance is bright, the display panel is provided with an excellent backlight, so that the display device has excellent image display quality.

As shown in FIG. 1, FIG. 4 and FIG. 5, several preferred embodiments of the novel light guiding films 10A, 10B, and 10C are disclosed. As can be seen from the drawings, the light guiding films 10A and 10B are visible. 10C includes a light guiding substrate 11 and a main dimming layer 12.

As shown in FIG. 1 to FIG. 5, the upper and lower sides of the light guiding substrate 11 are respectively a light emitting surface 111 and a bottom surface 112, and one side of the light emitting surface 111 and the bottom surface 112 has a light entering. The side 113 is a reverse light side 114 on the other side of the light emitting surface 111 and the bottom surface 112 opposite to the light incident side 113. The light guiding substrate 11 defines a first dimming area 101 and a second side. In the dimming area 102, the first dimming area 101 and the second dimming area 102 are sequentially arranged from the light incident side 113 toward the reverse light side 114. The material of the light guiding substrate 11 can be made of transparent polyethylene terephthalate (PET), etc., and the material has light weight, good toughness, tensile and impact strength, wear resistance and the like. Characteristics such as electrical insulation.

As shown in FIG. 1 to FIG. 5 , the main dimming layer 12 is formed on any one of the light emitting surface 111 and the bottom surface 112 of the light guiding substrate 11 , and the main dimming layer 12 includes a first dimming layer. The first dimming body 121 and the second dimming body 122 are respectively disposed in the first dimming area 101 and the second dimming area 102, and the first tune The light body 121 and the second light modulating body 122 have characteristics of absorbing light of wavelengths of different colors. The materials of the first light-adjusting body 121 and the second light-adjusting body 122 of the main light-adjusting layer 12 may be made of ultraviolet (Ultraviolet, UV) hardened rubber and hardened by ultraviolet (UV) irradiation. The material has the characteristics of fast curing, excellent weather resistance, non-yellowing, etc., and the light transmittance after curing is more than 90%, and the optical property is excellent.

The light guiding films 10A, 10B, and 10C are used to introduce light having a chromaticity of a light source. The color of the first light modulating body 121 and the second light modulating body 122 of the main light modulating layer 12 may be selected from the color of the light source. The complementary colors of the colors enable the first light modulating body 121 and the second light modulating body 122 to respectively absorb light of different color wavelengths, thereby transforming the color of the light.

Taking the light guiding film 10A shown in FIG. 1 to FIG. 3 as an example, when light enters the light incident side 113 of the light guiding substrate 11 , the light passes through the total reflection and scattering inside the light guiding substrate 11 to generate one side. In the light source, the yellowing phenomenon becomes more and more obvious when the light of the respective colors included in the light is reflected at the light guiding substrate 11 and the light is transmitted from the light entering side 113 toward the reverse light side 114. The light guiding film 10A further absorbs the wavelength light of different colors by the first light-modulating body 121 and the second light-modulating body 122 in the main light-adjusting layer 12, and can convert the light into a characteristic of partial blue light, and blends the light. The chromatic aberration between the light entering the light incident side 113 and the reverse light incident side 114 allows the chromatic aberration emitted by the light guiding film 10A to be adjusted to a preferred state.

The CIE 1976 chromaticity diagram quantifies the color by the u' axis and the v' axis. As shown in Fig. 8 and Fig. 9, the pre-improvement chromatic aberration curves V1 and U1 in the figure are the existing light guiding film test at u'. The color difference between the axis and the v' axis, and the improved color difference curves V2 and U2 are the color difference performances of the new light guide film colorimetric test on the u' axis and the v' axis, as can be clearly seen from the figures. In the u' axis and the v' axis, the color difference performance of the novel light guiding film can narrow the gap between the maximum value and the minimum value, and avoid the unevenness of the chromatic aberration.

In another embodiment, as shown in FIG. 4, the light-guiding film 10B may further be provided with a primary light-adjusting layer 13B, wherein the main light-adjusting layer 12 is formed on the light-emitting surface 111 of the light-guiding substrate 11, The light control layer 13B is formed on the bottom surface 112 of the light guiding substrate 11 . In addition, the main dimming layer 12 and the sub-dimming layer 13B can also be aligned (not shown), and the main dimming layer 12 is formed on the bottom surface 112 of the light guiding substrate 11, the sub-dimming layer 13B. The light exit surface 111 of the light guiding substrate 11 is formed.

In the foregoing, the sub-light modulating layer 13B includes a primary light modulating body 130. The material of the secondary light modulating body 130 is the same as the material of the first light modulating body 121 or the second light modulating body 122. The light body 130 has a characteristic of absorbing light of a wavelength of a predetermined color. In the embodiment shown in FIG. 4, the sub-light modulator 130 is disposed in the first dimming zone 101 and the second dimming zone 102. In addition, the sub-light modulator 130 may also be disposed at any of the first dimming zone 101 and the second dimming zone 102 (not shown).

In another embodiment shown in FIG. 5, the light guiding film 10C may further be provided with a primary light modulating layer 13C, wherein the main light modulating layer 12 is formed on the light emitting surface 111 of the light guiding substrate 11, The light control layer 13C is formed on the bottom surface 112 of the light guiding substrate 11. In addition, the main dimming layer 12 and the sub-dimming layer 13C can also be aligned (not shown), and the main dimming layer 12 is formed on the bottom surface 112 of the light guiding substrate 11, the sub-dimming layer 13C. The light exit surface 111 of the light guiding substrate 11 is formed.

In the foregoing, the secondary light modulating layer 13C includes a first time light modulating body 131 and a second time light modulating body 132. The first time illuminating body 131 and the second time illuminating body 132 are respectively disposed on the a first dimming zone 101 and a second dimming zone 102. The first dimming body 131 is a member having the same material as the first dimming body 121, and the second dimming body 132 is made of the same material. The first light modulating body 131 and the second time light modulating body 132 have characteristics of absorbing light of wavelength light of different colors.

When the light guiding films 10B and 10C have the sub-light-adjusting layers 13B and 13C, when the light enters the light-incident side 113 of the light-guiding substrate 11, the secondary light-adjusting layer 13B and 13C are combined by the main light-adjusting layer 12. The light-emitting surface and the bottom surface of the light-guiding substrate 11 are provided with the property of double-adjusting the chromatic aberration of light, so that the chromatic aberration emitted by the light-guiding films 10B and 10C can be adjusted to a better state.

As shown in FIG. 6, the backlight module 1 includes a light guiding film 10, a light source 20, and at least one optical film 30. The specific structure of the light guiding film 10 is as disclosed in the front photo film 10A, 10B. Any of the 10C embodiments is not described herein again. The light source 20 can be a light-emitting component including a light-emitting diode element. The light source 20 is disposed on the light-incident side 113 of the light-guiding film 10 for providing the light-guide film 10 with light having a light source chromaticity.

The optical film 30 may be a film having optical properties such as diffusion or brightness enhancement. The optical film 30 may be one piece or a plurality of pieces, and the optical film 30 is disposed in front of the light guiding film 10 . When the optical film 30 is a plurality of sheets, the plurality of optical films 30 are arranged in front of and behind the light guiding film 10 in sequence.

When the backlight module 1 of the present invention is used, the light emitted by the light source 20 is uniformly scattered by the total reflection inside the light guiding film 10, and is used in the light emitting surface 111 and the bottom surface 112 of the light guiding substrate 11, respectively. The main dimming layer 12 provides a harmonic chromatic aberration function, or further provides a function of assisting the harmonizing chromatic aberration in combination with the sub-dimming layers 13B, 13C, so that the light emitted through the light guiding film 10 is blended to a predetermined chromaticity of light, and the light is guided through The illuminating light emitted by the film 10 is further provided with brightness or uniform diffusion through the optical film 30 to improve the optical performance of the backlight module 1.

As shown in FIG. 7 , the display device of the present invention comprises a backlight module 1 and a display panel 2 . The specific structure of the backlight module 1 is as described in the embodiment of the front backlight module 1 . For example, the display panel 2 can be a liquid crystal display panel, and the display panel 2 is disposed in front of the optical film 30 of the backlight module 1 and is provided when the backlight module 1 displays a picture on the display panel 2 The necessary backlight.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Although the present invention has been disclosed above in the preferred embodiments, it is not intended to limit the present invention. The skilled person can make some modifications or modifications to the equivalent embodiments by using the above-disclosed technical contents without departing from the spirit and scope of the present invention. The technical content of the present invention is not limited to any simple modifications, equivalent changes and modifications of the preferred embodiments described above.

1‧‧‧Backlight module
2‧‧‧ display panel
10, 10A, 10B, 10C‧‧‧ light guide film
11‧‧‧Light guiding substrate
101‧‧‧First dimming zone
102‧‧‧Second dimming zone
111‧‧‧Glossy surface
112‧‧‧ bottom
113‧‧‧light side
114‧‧‧Reverse light side
12‧‧‧Main dimming layer
121‧‧‧First dimming body
122‧‧‧Second light body
13B, 13C‧‧‧ dimming layer
130‧‧‧ times dimming body
131‧‧‧First dimming body
132‧‧‧Second light body
20‧‧‧Light source
30‧‧‧Optical diaphragm

1 is a side plan view showing a first preferred embodiment of the novel light guiding film. 2 is a top plan view showing a first preferred embodiment of the light guiding film shown in FIG. 1. 3 is a perspective view showing the first preferred embodiment of the light guiding film of FIG. 1 forming a main light modulating layer on the light guiding substrate. 4 is a side plan view showing a second preferred embodiment of the novel light guiding film. Figure 5 is a side plan view showing a third preferred embodiment of the novel light guiding film. 6 is a side plan view showing a preferred embodiment of the backlight module of the present invention. Figure 7 is a side plan view showing a preferred embodiment of the novel display device. FIG. 8 is a schematic diagram showing the difference in chromaticity between the light guiding film of the present invention and the existing light guiding film in the u' axis of the CIE 1976 chromaticity diagram. FIG. 9 is a schematic diagram showing the difference in chromaticity between the light guiding film of the present invention and the existing light guiding film on the v′ axis of the CIE 1976 chromaticity diagram.

Claims (8)

A light guiding film comprising: a light guiding substrate, wherein the front and rear opposite sides are respectively a light emitting surface and a bottom surface, and a light incident side is disposed on a side of the light emitting surface and the bottom surface, and the light emitting surface is disposed on the light emitting surface The light-conducting substrate defines a first dimming area and a second dimming area, and the first dimming area and the first side are opposite to the other side of the light-incident side The two dimming zones are sequentially arranged from the light incident side toward the opposite light entering side; and a main dimming layer is formed on any one of a light emitting surface and a bottom surface of the light guiding substrate, the main The dimming layer includes a first dimming body and a second dimming body, and the first dimming body and the second dimming body are respectively disposed in the first dimming area and the second dimming area, and the The first light modulating body and the second light modulating body have characteristics of absorbing wavelength light of a different color. The light guiding film of claim 1, wherein the light guiding film further comprises a primary light modulating layer formed on one of a light emitting surface and a bottom surface of the light guiding substrate, The light modulating layer is formed on the other of the light emitting surface and the bottom surface of the light guiding substrate, wherein the secondary light modulating layer comprises a primary light modulating body, wherein the secondary light modulating body is disposed in the first light modulating area, the second The dimming zone or a combination thereof, wherein the sub-dimming body is a member having the same material as the first dimming body or the second dimming body material. The light guiding film of claim 1, wherein the light guiding film further comprises a primary light modulating layer formed on one of a light emitting surface and a bottom surface of the light guiding substrate, The dimming layer is formed on the other of the light emitting surface and the bottom surface of the light guiding substrate, wherein the secondary light adjusting layer comprises a first time light adjusting body and a second time light adjusting body, the first time light dimming And the second dimming body is respectively disposed in the first dimming zone and the second dimming zone, wherein the first dimming body is a component having the same material as the first dimming material, and the first The secondary light modulating body is a member having the same material as the second light modulating material. The light guiding film according to any one of claims 1 to 3, wherein the first light modulating body and the second light modulating system of the main light modulating layer are respectively formed of ultraviolet (UV) hardened rubber. The light guiding film according to any one of claims 1 to 3, wherein the light guiding substrate is a member formed of a polyethylene terephthalate (PET) material. The light guiding film according to any one of claims 1 to 3, wherein the light guiding substrate is a member formed of polyethylene terephthalate (PET) material, and the light guiding layer is The first light modulating body and the second light modulating system are respectively formed of ultraviolet (UV) hardened rubber materials. A backlight module, comprising: the light guiding film according to any one of claims 1 to 6, wherein a light source is disposed on a light incident side of the light guiding film to provide light having a chromaticity of a light source; At least one optical film is disposed in front of the light guiding film. A display device comprising: the backlight module of claim 7; and a display panel disposed in front of the optical film of the backlight module.