CN1318896C - Double-sided light-emitting backlight module for optical color conversion - Google Patents

Abstract

The invention discloses a double-sided light-emitting backlight module with optical color conversion. A transflective sheet is arranged on one side of the light guide plate opposite to the light emitting surface, and the transflective sheet contains an optical color conversion layer, so that most of light emitted by the light source is reflected by the transflective sheet and emitted from the light emitting surface, and a small part of light passes through the transflective sheet and is converted into light emitting with different colors by the optical color conversion layer, so that two sides of the light guide plate emit light with different colors.

Description

Double-sided light-emitting backlight module for optical color conversion

technical field

The invention relates to a double-sided light-emitting backlight module that realizes optical color conversion, in particular to a backlight module that can emit light of different colors on both sides by only using a single-color light source.

Background technique

Figure 2 shows a double-sided light-emitting backlight module 8 previously developed by the applicant. It is provided with a semi-transparent reflective film 82 on the back of a light guide plate 81, and the light emitted by the light source 83 is reflected by the semi-transparent reflective film 82. , so that most of the light is emitted from the light-emitting surface 811 of the light guide plate 81 to provide a backlight for the first display module 91, while a small part of the light passes through the semi-transparent film 82 and is emitted from the back of the light guide plate 81 to provide A backlight is provided as the second display module 92 .

However, in the aforementioned structure, the light emitted from both sides of the light guide plate 81 is the same color, usually white light. And because the inner main screen of a general dual-screen mobile phone is usually a color display module, and the small screen outside is usually a monochromatic display module, so if this double-sided light-emitting backlight module 8 is applied to products such as dual-screen mobile phones, This will result in a situation where the main screen on the inside is displayed in color and the small screen on the outside is displayed in black and white, which will lead to the problem that the overall texture of the mobile phone is dull and lacks change.

In order to make the monochrome display modules of the small screen outside present different hues, it is necessary to set up another set of backlight modules of different colors, or to add another set of color conversion components. The problem of increased thickness.

Therefore, it is really necessary to improve the aforementioned double-sided light-emitting backlight module.

Contents of the invention

The main purpose of the present invention is to provide a double-sided light-emitting backlight module capable of realizing optical color conversion to solve the above problems. An optical color conversion layer is contained in the transflective film of the module, so that the light passing through the transflective component is converted into light of different colors, so as to realize the The effect of emitting different colors of light on both sides.

For realizing above-mentioned purpose of the invention, the present invention adopts following technical scheme:

A double-sided light-emitting backlight module with optical color conversion, characterized in that:

The double-sided light-emitting backlight module includes a light guide plate, the light guide plate has a light incident surface, a light source is provided adjacent to the light incident surface, and the light guide plate has a light exit surface adjacent to the light incident surface, and the light guide plate The side of the light plate opposite to the light-emitting surface is provided with a semi-transparent reflective sheet, and the semi-transparent reflective sheet contains an optical color conversion layer that can convert the light passing through the semi-transparent reflective sheet into different colors;

The transflective sheet includes a transparent substrate, a transflective layer is provided on one side of the transparent substrate adjacent to the light guide plate, and the optical color conversion layer is provided on the other side of the transparent substrate. The advantages of the present invention are: through the arrangement of the transflective sheet with optical color conversion function, only a single color light source can be used to realize the effect of emitting light of different colors on both sides, the manufacturing cost is low, the module thickness is small, and the weight is light.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a structural schematic diagram of the present invention.

FIG. 2 is a schematic structural diagram of a conventional double-sided light-emitting backlight module.

Detailed ways

As shown in FIG. 1, the double-sided light-emitting backlight module for optical color conversion according to the present invention includes a light guide plate 1, the light guide plate 1 has a light incident surface 11, and a light source 2 is arranged adjacent to the light incident surface 11, and The light guide plate 1 has a light exit surface 12 adjacent to the light incident surface 11, and the side of the light guide plate 1 opposite to the light exit surface 12 is provided with a semi-transparent reflective sheet 3, and the structure of the semi-transparent reflective sheet 3 includes a transparent Substrate 31, the side of the transparent substrate 31 adjacent to the light guide plate 1 is provided with a semi-transparent reflective layer 32 and the other side of the transparent substrate 31 is provided with an optical color conversion layer 33, so that through the transflective sheet 3 The light is converted by the optical color conversion layer 33 into different colors of light

The double-sided light-emitting backlight module with optical color conversion described in the present invention will be used with a color display module 4 on the light-emitting surface 12 and a monochromatic display module 5 on one side of the transflective sheet 3 in actual use. .

Hereinafter, the white light source 2 and the orange-yellow optical color conversion layer 33 are used, and the transflective layer 32 has a low light transmittance as an example. Since most of the light emitted by the light source 2 into the light guide plate 1 will be reflected by the transflective layer 32 of the transflective sheet 3, white light will be emitted from the light exit surface 12 to be used as the backlight of the color display module 4; A small part of the light from the light panel 1 will pass through the transflector 3, and be converted into a light blue-violet backlight by the orange-yellow optical color conversion layer 33 for use by the monochrome display module 5, so that the monochrome display module 5 appears pale. Blue-purple undertones.

The present invention achieves the effect of emitting light of different colors on both sides under the premise of only using a single color light source and having low cost, thin shape and light weight through the arrangement of the transflector 3 with optical color conversion function.

There are, of course, many other embodiments of the invention which vary only in detail. For example, the light transmittance of the transflective layer of the transflective sheet can be designed to be 5% to 90% light transmittance as required, so that the backlights of different colors on both sides can be proportioned to different intensity ratios according to different requirements. , so as to further improve the effect of using backlights with different colors on both sides.

Claims (1)

1. the double-side backlight module of optics look conversion is characterized in that:

Described double-side backlight module comprises a light guide plate, this light guide plate has an incidence surface, contiguous this incidence surface place is provided with a light source, and this light guide plate has an exiting surface adjacent to this incidence surface, and this light guide plate is provided with a semi-transparent reflector plate with respect to the one side of this exiting surface, contains one in this transflectors and can make the light that passes this transflectors be converted to the optics color converting layer of different colours;

Comprise a transparent base in this transflectors, the one side of contiguous this light guide plate of this transparent base is provided with a semi-transparent reflection horizon, and the another side of this transparent base is provided with this optics color converting layer.

Images