TWM524486U - Reflective type anti-blue light film and display device having the reflective type anti-blue light film - Google Patents

Abstract

The utility model provides a reflective type anti-blue light film. The reflective type anti-blue light film includes a base layer and a cholesteric liquid crystal anti-blue light layer, and the cholesteric liquid crystal anti-blue light layer is disposed on the base layer. A portion of a blue light of a light ray coming from a light source is capable of being reflected by the cholesteric liquid crystal anti-blue light layer. Therefore, a light intensity of the blue light of the light ray coming from the light source can be reduced, thus, a damage to eyes caused by over-high blue light can be avoided.

Description

Reflective anti-blue film and display with reflective anti-blue film

The present invention relates to an anti-blue film, and more particularly to a reflective anti-blue film using a Cholesteric liquid crystal anti-blue light layer, and the reflective anti-blue film. Display device.

Due to advances in technology, liquid crystal display technology has been widely used. Among them, a liquid crystal display using a Light Emitting Diode (LED) or an Organic Light Emitting Diode (OLED) as a backlight source is light and thin. The characteristics are favored.

The light that the eye can feel is called visible light. It is an electromagnetic wave with a wavelength between 400 nm and 700 nm, including the well-known colors of "red, orange, yellow, green, blue, enamel, purple". Wavelengths greater than 700 nm are called infrared light, and wavelengths less than 400 nm are called ultraviolet light. Infrared light and ultraviolet light are usually blocked by the cornea and water crystal, and have less influence on the retina. The true influence of the retina is blue light with a wavelength between 400 nm and 500 nm.

The main source of blue light is the sun, but in recent years, the development of semiconductor technology, many electronic products, including flat panel displays, LED neon lights, fluorescent lights, computer monitors, mobile phone screens, etc., have backgrounds using light-emitting diodes or organic light-emitting diodes. light source. The light source of the light-emitting diode or the organic light-emitting diode excited by the powerful electron current contains abnormal high-energy blue light. The latest medical research shows that this high-energy blue light can cause damage to the retina, especially increasing the incidence of macular lesions.

Generally, a white light emitting diode used as a backlight source includes a blue light emitting diode and a yellow fluorescent powder. The blue light emitted by the blue light emitting diode will excite the yellow fluorescent powder to generate yellow light, and by the light mixing of the blue light and the yellow light, the white light seen by the vision is generated; in other words, the main light intensity band region is still It is a blue light area.

1 is a spectrum diagram of a backlight source using a white light emitting diode, wherein the horizontal axis represents wavelength (nm) and the vertical axis represents light intensity (count value). Referring to Figure 1, curve 100 shows the light intensity in the wavelength range from 380 nm to 780 nm. It can be seen that the light intensity in the blue wavelength range as indicated by circle A is the highest. When the user watches the display using the above backlight source for a long time, the high-intensity blue light will penetrate the eyeball crystal and reach the retina, which easily causes the lesion of the macula of the eyeball. Accordingly, in order to avoid the influence of high-intensity blue light on the eyes, a related product against the blue light film has appeared.

A commercially available anti-blue light film is mainly composed of an absorption type dyeing agent, and absorbs blue light by the absorption type dyeing agent. However, the absorptive dye does not absorb the blue light generated by the above backlight source because the absorbed blue light has a wavelength range of less than 420 nm; in other words, the anti-blue film with the absorption dye is substantially not filtered out. The high intensity blue light produced by the above backlight source.

The novel creation provides a reflective anti-blue film, which adopts a cholesteric liquid crystal blue reflective layer, which can effectively reflect the blue light emitted by the backlight source of the display, thereby reducing the light intensity of the blue light, and avoiding the blue light having excessive light intensity on the eye. hurt.

The novel reflective blue light-resistant film comprises: a base layer and a cholesteric liquid crystal blue reflective layer. The cholesteric liquid crystal blue reflective layer is disposed on the base layer, wherein a portion of a blue light contained in a light from a light source is reflected by the cholesteric liquid crystal blue reflective layer.

In an embodiment of the present invention, the cholesteric liquid crystal blue reflective layer comprises: a left-handed cholesteric liquid crystal blue reflective layer, and a right-handed cholesteric liquid crystal blue reflective layer disposed on one side of the left-handed cholesteric liquid crystal blue reflective layer. The left-handed cholesteric liquid crystal blue light reflecting layer is matched with the right-handed cholesteric liquid crystal blue light reflecting layer, and a portion of the blue light reflected is a ratio of more than 0% to less than or equal to 100% of the total blue light contained in the light.

In an embodiment of the present invention, the base layer is a single film layer, and the base layer may be: polyethylene terephthalate (PET), triacetate cellulose film (Triacetate Cellulose Film, TAC), polycarbonate (PC), polymethyl methacrylate (PMMA), Cyclo Olefin Polymer (COP), anti-reflective coating, hard coating, anti-glare One of the layers and the anti-fingerprint layer.

In an embodiment of the present invention, the base layer is a multilayer film structure layer, and the base layer comprises: polyethylene terephthalate (PET), triacetate cellulose film (Triacetate Cellulose Film, TAC), polycarbonate (PC), polymethyl methacrylate (PMMA), Cyclo Olefin Polymer (COP), anti-reflective coating, hard coating, anti-glare At least two layers of the layer and the anti-fingerprint layer.

In an embodiment of the present invention, the reflective blue light-resistant film further includes: a first release layer disposed on a side of the cholesteric liquid crystal blue reflective layer remote from the base layer.

In an embodiment of the present invention, the reflective blue light-resistant film further includes: a second release layer disposed on a side of the base layer away from the cholesteric liquid crystal blue reflective layer.

The display created by the novel comprises: a display module and the above-mentioned reflective anti-blue film. The reflective blue light-resistant film described above is disposed on the display module.

The display created by the novel comprises: a display module and the above-mentioned reflective anti-blue film. The reflective blue light-resistant film described above is disposed in the display module, wherein the base layer is selectively removed.

Based on the above, the novel reflective blue light-resistant film uses a cholesteric liquid crystal blue reflective layer, which can effectively reflect the high-intensity blue light emitted by the backlight source of the display. In this way, it is possible to prevent the blue light having an excessively high light intensity from causing damage to the eyes.

The above described features and advantages of the present invention will become more apparent and understood.

The reflective anti-blue film provided by the novel creation adopts a cholesteric liquid crystal blue reflective layer, which can effectively reflect the high-intensity blue light emitted by the backlight source of the display, thereby reducing the light intensity of the blue light. In this way, blue light with excessive light intensity can be prevented from causing damage to the eyes. Hereinafter, various possible embodiments of the novel creation will be explained in detail with reference to the drawings.

2 is a perspective exploded view of a reflective anti-blue film according to an embodiment of the present invention. Referring to FIG. 2, the reflective anti-blue film 200 includes a base layer 210 and a cholesteric liquid crystal blue reflective layer 220. The cholesteric liquid crystal blue reflective layer 220 is disposed on the base layer 210. A portion of the blue light contained in the light from the light source can be reflected by the cholesteric liquid crystal blue reflective layer 220.

Referring to FIG. 2, the cholesteric liquid crystal blue reflective layer 220 may have a haze of 1% or less. Thereby, the visual effect of the reflective anti-blue film 200 on the display can be reduced.

In an embodiment, the base layer 210 may be a single film layer, and the base layer 210 may be selected from a polyethylene terephthalate (PET) or a triacetate cellulose film (TAC). Polycarbonate (PC), polymethyl methacrylate (PMMA), Cyclo Olefin Polymer (COP), antireflection layer, hard coat layer, anti-glare layer, One of the anti-fingerprint layers. Thereby, in addition to the base layer 210 for carrying the cholesteric liquid crystal blue reflective layer 220, the characteristics of the base layer 210 itself can be utilized to increase the function of the reflective anti-blue light film 200.

In detail, when the base layer 210 is an anti-reflection layer, the reflective anti-blue film 200 can have an anti-reflection function; when the base layer 210 is a hard coat layer, the reflective anti-blue film 200 can have a scratch-resistant function. Better protect the display panel.

In another embodiment, the base layer 210 may also be a multilayer film structure layer, and the base layer 210 may include: polyethylene terephthalate (PET), triacetate cellulose film (TAC) ), polycarbonate (PC), polymethyl methacrylate (PMMA), Cyclo Olefin Polymer (COP), anti-reflective layer, hard coating, anti-glare layer At least two layers of the anti-fingerprint layer. That is to say, the base layer 210 can be stacked by a plurality of functional layers to simultaneously obtain various functions required.

As shown in FIG. 2, the reflective anti-blue film 200 can be formulated with a cholesteric liquid crystal coating solution according to the wavelength range of blue light to be reflected, and coated with a cholesteric liquid crystal coating solution in a roll-to-roll process. To the base layer 210. The alignment treatment may be performed on the base layer, and examples of the alignment treatment include any of alignment methods known to those skilled in the art, such as a rubbing alignment method and a photo alignment method. Thereafter, a liquid crystal material is applied onto the base layer, and the cholesteric liquid crystal coating liquid is solidified by drying and ultraviolet exposure to form a cholesteric liquid crystal blue reflective layer 220.

3 is a breakthrough spectrum diagram of the reflective anti-blue film of FIG. 2. Referring to FIG. 2 and FIG. 3 simultaneously, the cholesteric liquid crystal blue reflective layer 220 is formulated with a set ratio, and is capable of generating selectivity for blue light of a set wavelength range; in other words, the cholesteric liquid crystal blue reflective layer 220 can enable blue light of a set wavelength range. Part of it reflects and penetrates another part of the blue light.

In the embodiment of FIG. 3, curve 300 shows the change in light intensity, ie, transmittance (%), of the cholesteric liquid crystal blue reflective layer 220 in the wavelength range of 380 nm to 500 nm. As shown in FIG. 3, in this embodiment, the blue light reflected by the cholesteric liquid crystal blue reflective layer 220 may range from 390 nm to 455 nm.

Referring to FIG. 3, the transmittance of blue light having a wavelength range of 390 nm to 455 nm is reduced by about 10% to 50%; in other words, a part of the reflected blue light accounts for about 23% of the total blue light contained in the light. . In addition, as can be seen from FIG. 3, the visible light of the visible light other than the blue light in the light may be greater than or equal to 90% with respect to the light transmittance of the cholesteric liquid crystal blue reflective layer 220.

4 is a spectrogram of a backlight source in which the reflective anti-blue film of FIG. 2 is disposed. Referring to FIG. 4, the curve 410 is the spectrum of the backlight source, the curve 420 is the spectrum of the backlight source provided with the reflective anti-blue film 200, and the curve 430 is the spectrum of the reflective anti-blue film 200. Comparing the curve 410 with the curve 420, it can be known that in the wavelength range of 420 nm to 480 nm, a part of the blue light reflected by the cholesteric liquid crystal blue reflective layer 220 accounts for about 23% of the total blue light contained in the light. In view of the above, the cholesteric liquid crystal blue light reflecting layer 220 can reflect the blue light of the backlight source using the white light emitting diode, and shield the partial blue light, thereby substantially reducing the light intensity of the blue light harmful to the eyes.

In addition, in the embodiment of FIG. 2, the cholesteric liquid crystal blue reflective layer 220 is a single film layer, that is, the cholesteric liquid crystal blue reflective layer 220 may be a left-handed cholesteric liquid crystal blue light reflecting layer or a right-handed cholesteric liquid crystal blue light reflecting layer. However, the invention is not limited thereto. In other embodiments, the cholesteric liquid crystal blue reflective layer 220 can also be a multilayer film structural layer. In detail, the cholesteric liquid crystal blue light reflecting layer 220 may include: a left-handed cholesteric liquid crystal blue light reflecting layer and a right-handed cholesteric liquid crystal blue light reflecting layer, wherein the right-handed cholesteric liquid crystal blue light reflecting layer is disposed on one side of the left-handed cholesteric liquid crystal blue reflective layer. In more detail, in the reflective anti-blue film 200, the left-handed cholesteric liquid crystal blue light reflecting layer is matched with the right-handed cholesteric liquid crystal blue light reflecting layer, so that a part of the reflected blue light accounts for the proportion of all the blue light contained in the light. Between greater than 0% to less than or equal to 100%.

Figure 5 is a perspective exploded view of another reflective anti-blue film created by the present invention. Referring to FIG. 5 , in this embodiment, the reflective anti-blue film 500 includes a base layer 510 , a cholesteric liquid crystal blue reflective layer 520 , and a first release layer 530 . The first release layer 530 is disposed on a side of the cholesteric liquid crystal blue reflective layer 520 that is away from the base layer 510.

Basically, the base layer 510 and the cholesteric liquid crystal blue reflective layer 520 as shown in FIG. 5 are the same as those in the embodiment of FIG. 2 and will not be repeated here. The embodiment of FIG. 5 adds a first release layer 530 that protects the cholesteric liquid crystal blue reflective layer 520. Also, when the reflective blue light-resistant film 500 is to be used, it can be attached to the display panel after peeling off the first release layer 530.

Fig. 6 is a perspective exploded view of still another reflective anti-blue film created by the novel. Referring to FIG. 6 , in this embodiment, the reflective anti-blue film 600 includes a base layer 610 , a cholesteric liquid crystal blue reflective layer 620 , a first release layer 630 , and a second release layer 640 . The first release layer 630 is disposed on a side of the cholesteric liquid crystal blue reflective layer 620 that is away from the base layer 610. The second release layer 640 is disposed on a side of the base layer 610 remote from the cholesteric liquid crystal blue reflective layer 620.

Similarly, the base layer 610, the cholesteric liquid crystal blue reflective layer 620, and the first release layer 630 as shown in FIG. 6 are the same as those in the embodiment of FIG. 5 and will not be repeated here. The reflective blue light resistant film 600 of the embodiment of FIG. 6 also adds a second release layer 640. By the first release layer 630 and the second release layer 640, the base layer 610 and the cholesteric liquid crystal blue reflective layer 620 can be better protected before the reflective anti-blue film 600 is used.

Fig. 7 is a schematic view showing the bonding of the reflective blue light-resistant film of the present invention to the outside of the display. Referring to FIG. 7 , the display 700 includes a display module 730 and a reflective anti-blue film 702 . The display module 730 can have a display panel and a backlight source that emits high intensity blue light. The reflective anti-blue film 702 includes a base layer 710 and a cholesteric liquid crystal blue reflective layer 720.

As shown in FIG. 7, the reflective anti-blue film 702 is externally attached to the display module 730, and the base layer 710 functions to protect the cholesteric liquid crystal blue reflective layer 720. Also, the blue light LB1 from a portion of the display module 730 is reflected by the cholesteric liquid crystal blue reflective layer 720, and the other portion of the blue light LB2 penetrates the cholesteric liquid crystal blue reflective layer 720. Thereby, the light intensity of the blue light emitted by the display module 730 can be reduced. The backlight source of the display module 730 may be a backlight source using a white light emitting diode, and the white light emitting diode comprises: a blue light emitting diode and a yellow fluorescent powder.

FIG. 8 is a schematic view showing the reflective blue light-resistant film of the present invention disposed inside the display. Referring to FIG. 8 , the display 800 includes a backlight source 830 , a display panel 810 , a frame 840 , and a cholesteric liquid crystal blue reflective layer 820 . In the embodiment of FIG. 8, the base layer of the reflective anti-blue film can be removed, and only the cholesteric liquid crystal blue reflective layer 820 is disposed inside the display 800. Likewise, the high intensity blue light LB1 from a portion of the backlight source 830 is reflected by the cholesteric liquid crystal blue reflective layer 820, while the other portion of the high intensity blue light LB2 penetrates the cholesteric liquid crystal blue reflective layer 820. Thereby, the light intensity of the blue light emitted by the backlight source 830 can be reduced.

Fig. 9 is a spectrum diagram of a liquid crystal screen provided with two reflective blue light-resistant films (blue light reflecting film A, blue light reflecting film B) created by the present invention. Referring to FIG. 9 , from the breakthrough spectrum of the blue reflective film A, it can be seen that the blue light reflected by the cholesteric liquid crystal blue reflective layer of the blue reflective film A ranges from 410 nm to 510 nm, and the reflected blue light is reflected. A portion of the total blue light contained in the light is on average about 45%. From the breakthrough spectrum of the blue reflective film B, it can be seen that the blue light reflected by the cholesteric liquid crystal blue reflective layer of the blue reflective film B ranges from 390 nm to 455 nm, and a part of the reflected blue light occupies the light. The proportion of all blue light contained is on average about 23%.

As shown in Fig. 9, the backlight source of the liquid crystal screen emits a blue light band of 420 nm to 450 nm, which is compared with "LCD light intensity spectrum", "LCD screen + blue light reflection film A light intensity spectrum", "LCD screen + blue light". The light intensity spectrum of the reflective film B shows that the light intensity of the blue light band of the liquid crystal light intensity spectrum can be significantly reduced after being combined with any of the blue light reflecting film A or the blue light reflecting film B.

Fig. 10 is a spectrum diagram of a liquid crystal screen of two kinds of anti-blue film (commercially available product A, commercially available product B) provided with a general commercial product. The backlight source of the LCD screen emits a blue light band of 420 nm or less, and compares "LCD screen light intensity spectrum", "LCD screen + commercially available A light intensity spectrum", "LCD screen + commercially available product B light intensity spectrum". It can be seen that the light intensity of the blue light of the liquid crystal screen intensity spectrum hardly changes, that is, even if it is matched with the anti-blue film of the commercially available product A and the anti-blue film of the commercial product B, the blue light of the liquid crystal light intensity spectrum cannot be lowered. The light intensity of the band.

In summary, the novel reflective blue light-resistant film uses a cholesteric liquid crystal blue reflective layer, which can effectively reflect the high-intensity blue light emitted by the backlight source of the display. In this way, it is possible to prevent the blue light having an excessively high light intensity from causing damage to the eyes.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the creation of the present invention. Any person having ordinary knowledge in the art can make some changes without departing from the spirit and scope of the novel creation. Retouching, the scope of protection of this new creation is subject to the definition of the scope of the patent application attached.

100, 300, 410, 420, 430‧‧‧ curves
200, 500, 600, 702‧‧‧reflective anti-blue film
210, 510, 610, 710‧‧‧ grassroots
220, 520, 620, 720, 820‧‧‧ cholesteric liquid crystal blue reflective layer
530, 630‧‧‧ first release layer
640‧‧‧Second release layer
700, 800‧‧‧ display
730‧‧‧ display module
810‧‧‧ display panel
830‧‧‧Backlight source
840‧‧‧Frame
A‧‧‧ circle (blue wavelength range)
LB1, LB2‧‧‧ Blu-ray

1 is a spectrum diagram of a backlight source using a white light emitting diode, wherein the horizontal axis represents wavelength (nm) and the vertical axis represents light intensity (count value). 2 is a perspective exploded view of a reflective anti-blue film according to an embodiment of the present invention. 3 is a breakthrough spectrum diagram of the reflective anti-blue film of FIG. 2. 4 is a spectrogram of a backlight source in which the reflective anti-blue film of FIG. 2 is disposed. Figure 5 is a perspective exploded view of another reflective anti-blue film created by the present invention. Fig. 6 is a perspective exploded view of still another reflective anti-blue film created by the novel. Fig. 7 is a schematic view showing the bonding of the reflective blue light-resistant film of the present invention to the outside of the display. FIG. 8 is a schematic view showing the reflective blue light-resistant film of the present invention disposed inside the display. FIG. 9 is a spectrum diagram of a liquid crystal screen provided with two reflective blue light-resistant films (blue light reflecting film A and blue light reflecting film B) created in the present invention. FIG. 10 is a view showing two kinds of anti-blue light films which are generally commercially available. A spectrum of the liquid crystal screen of the product A and the commercially available product B).

200‧‧‧Reflective anti-blue film

210‧‧‧ grassroots

220‧‧‧Cholesterol liquid crystal blue reflective layer

Claims (7)

A reflective anti-blue film comprising: a base layer; and a cholesteric liquid crystal blue reflective layer disposed on the base layer, wherein a portion of a blue light contained in a light from a light source is capable of being reflected by the cholesteric liquid crystal blue light The layer is reflected. The reflective blue light-resistant film according to claim 1, wherein the cholesteric liquid crystal blue light reflecting layer comprises: a left-handed cholesteric liquid crystal blue light reflecting layer; and a right-handed cholesteric liquid crystal blue light reflecting layer disposed on the left-handed cholesteric liquid crystal One side of the blue light reflecting layer, with the left-handed cholesteric liquid crystal blue light reflecting layer and the right-handed cholesteric liquid crystal blue light reflecting layer, a portion of the blue light reflected by the light occupies more than 0% of the total blue light contained in the light Less than or equal to 100%. The reflective blue light-resistant film according to claim 1, wherein the base layer is a single film layer, and the base layer is selected from the group consisting of polyethylene terephthalate (PET) and triacetic acid. Triacetate Cellulose Film (TAC), Polycarbonate (PC), Polymethyl Methacrylate (PMMA), Cyclo Olefin Polymer (COP), Anti-Reflection One of a layer, a hard coat layer, an anti-glare layer, and an anti-fingerprint layer. The reflective blue light-resistant film according to claim 1, wherein the base layer is a multilayer film structure layer, and the base layer comprises: polyethylene terephthalate (PET) film, triacetic acid Triacetate Cellulose Film (TAC), Polycarbonate (PC), Polymethyl Methacrylate (PMMA), Cyclo Olefin Polymer (COP), Anti-Reflection At least two layers of a layer, a hard coat layer, an anti-glare layer, and an anti-fingerprint layer. The reflective blue light-resistant film of claim 1, further comprising: a first release layer disposed on a side of the cholesteric liquid crystal blue reflective layer remote from the base layer. The reflective blue light-resistant film of claim 5, further comprising: a second release layer disposed on a side of the base layer remote from the cholesteric liquid crystal blue reflective layer. A display, comprising: a display module; and the reflective anti-blue film according to any one of claims 1 to 6, wherein the reflective module is disposed in the display module, wherein the display module is selectively removable Grassroots.