TW202034039A - Display device - Google Patents

Abstract

A display device includes a display panel and a backlight module. The backlight module includes a plurality of white LEDs. Each white LED includes a blue light chip and a yellow fluorescent material encapsulated on the blue light chip. A light adjusting component is located in the display panel or the backlight module. The light adjusting component has a transmittance of no more than 10% for blue light having wavelength below 450 nm and a transmittance of no less than 90% for blue light having wavelengths above 470 nm. The light adjusting element is also used for reducing yellow light having wavelength between 575 nm and 595 nm. By using a white LED and a light adjusting component that filters blue light and yellow light of a specific wavelength, the light damaging the eye emitted from the display device can be effectively reduced, and the color saturation of the display image can be improved.

Description

Display device

The invention relates to a display device, in particular to a display device with eye protection and high color saturation.

At present, monitors usually display color images by adjusting the ratio of red, green, and blue light. However, the blue light easily penetrates the lens of the cornea and contacts the retina, accelerating the oxidation of cells in the retinal spot area, causing disease in the spot area of the human retina, damaging the visual cells, and adversely affecting the health of the eye.

In view of this, it is necessary to provide a display device that can achieve eye protection and high color saturation.

A display device includes: Display panel A backlight module laminated with the display panel, the backlight module includes a plurality of white light LEDs, each white light LED includes a blue light chip and a yellow fluorescent material packaged on the blue light chip; and A light adjusting element, which is arranged on the display panel or on the backlight module, the light adjusting element has a transmittance of no more than 10% for blue light with a wavelength below 450nm, and has no transmittance for blue light with a wavelength above 470nm Less than 90%; the light adjusting element is also used to reduce the penetration of yellow light with a wavelength between 575nm and 595nm.

A display device, which includes: Display panel A backlight module laminated with the display panel, the backlight module including a plurality of white light LEDs, each white light LED including a blue light chip and a red fluorescent material and a green fluorescent material packaged on the blue light chip; and A light adjusting element, which is arranged on the display panel or on the backlight module, the light adjusting element has a transmittance of no more than 10% for blue light with a wavelength below 450nm, and has no transmittance for blue light with a wavelength above 470nm Less than 90%.

The present invention uses a specific white LED in the display device with a light adjustment element that filters out specific wavelength blue light, yellow light or blue light, which can effectively reduce the eye-damaging light emitted from the display device, thereby achieving the effect of protecting the eyes. It can also improve the color saturation of the display screen.

The accompanying drawings show embodiments of the present invention. The present invention can be implemented in a variety of different forms, and should not be interpreted as being limited to the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more comprehensive and complete, and to enable those skilled in the art to fully understand the scope of the present invention.

The wavelength of blue light (blue light) is usually between 400nm and 500nm. Studies have found that blue light with a wavelength between 415nm and 455nm is the most harmful to the eyes. Therefore, the present invention aims to reduce the blue light of the wavelength between 415nm and 455nm emitted from the display device, thereby preventing the blue light of the above wavelength band from having adverse effects on the eyes.

As shown in FIG. 1, the display device 100 a provided by the first embodiment of the present invention includes a stacked display panel 10 and a backlight module 30. Wherein, the display panel 10 is a liquid crystal display panel, which is used to control the amount of light passing through the rotation of the liquid crystal. The backlight module 30 is used to provide a surface light source in the direction of the display panel 10.

The display panel 10 includes a transparent cover 20, an upper polarizer 11, a color filter substrate 13, a liquid crystal layer 15, a thin film transistor (TFT) substrate 17, and a lower polarizer 19 stacked in sequence, wherein the lower polarizer 19 is close to the backlight Module 30. The color filter substrate 13 and the TFT substrate 17 are arranged opposite to each other. The liquid crystal layer 15 is sandwiched between the color filter substrate 13 and the TFT substrate 17. The upper polarizer 11 can pass the light with the polarization direction along the first direction, and the lower polarizer 19 can pass the light with the polarization direction along the second direction perpendicular to the first direction.

The backlight module 30 provides a surface light source, and the light emitted by it sequentially passes through the lower polarizer 19, the TFT substrate 17, the liquid crystal layer 15, the color filter substrate 13, the upper polarizer 11 and the transparent cover 20, by Controlling the rotation of the liquid crystal molecules in the liquid crystal layer 15 drives the polarization direction of the light to change, so as to realize picture display.

The backlight module 30 includes a plurality of white LEDs 31 for emitting light. The white LEDs 31 are not shown in FIG. 1. Please refer to FIG. 6 and FIG. 7 for the white light LED 31. Each white light LED 31 includes a blue light chip 311 and a fluorescent material 313 encapsulated on the blue light chip 311. In one embodiment, the fluorescent material 313 includes a red fluorescent material and a green fluorescent material. The peak of the blue light emitted by the blue chip is 460-475 nm. As shown in FIG. 1, the display device 100a is provided with a light adjusting element 50a, which can reduce blue light with a wavelength between 415nm and 455nm in the light emitted from the light emitting surface of the display device 100a, thereby reducing The blue light in the display device 100a is harmful to the eyes, thereby protecting the eyesight of the viewer. At the same time, since there is no yellow light in the light emitted by the white LED, the color saturation and brightness displayed by the display device 100a can be ensured. In this embodiment, the light adjusting element 50a has a transmittance of no more than 10% for blue light with a wavelength below 450nm, a transmittance of no less than 90% for blue light with a wavelength of over 470nm, and has a transmittance of no less than 90% for blue light with a wavelength of 450nm to 470nm. The transmittance of blue light in the middle increases as the wavelength increases, as shown in Figure 8.

In another embodiment, the fluorescent material 313 is a yellow fluorescent material. The peak of the blue light emitted by the blue chip is 460-475 nm. The yellow fluorescent material can be aluminate fluorescent material or silicate fluorescent material. At this time, the light emitted by the white LED 31 contains yellow light (yellow light). The yellow light with a wavelength of about 575 nm to 595 nm has an effect on the color saturation of the display. Therefore, it is necessary to reduce the yellow light with a wavelength of about 575 nm to 595 nm emitted from the display device to improve the color saturation of the display device 100a. In this case, as shown in FIG. 1, the display device 100a is provided with a light adjusting element 50b, and the light adjusting element 50b can reduce the light emitted from the light emitting surface of the display device 100a with a wavelength between 415nm and 455nm. Blue light and yellow light with a wavelength between 575nm and 595nm. In this embodiment, as shown in FIG. 9, the light adjusting element 50a has a transmittance of no more than 10% for blue light with a wavelength below 450 nm, and has a transmittance of no less than 90% for blue light with a wavelength of over 470 nm. The transmittance of blue light with a wavelength from 450nm to 470nm increases as the wavelength increases. With the light adjusting element 50b, the light transmittance curve of yellow light presents a concave peak, the center of the concave peak is between 575nm and 595nm, the width of the concave peak is 15-30nm, and the transmittance of yellow light is at the concave peak The center reaches a minimum of about 60%.

The light adjusting element 50 a or the light adjusting element 50 b may be arranged on any film layer in the display panel 10, or may be arranged on the backlight module 30.

The light adjusting element 50a is a single blue filter, and it may include a multilayer film of two materials with different refractive indexes, which are alternately arranged, and the two materials may be selected from gallium nitride, titanium oxide, aluminum oxide, and indium tin oxide. Oxide, silicon oxide, silicon nitride, etc.

The light adjusting element 50b can filter blue light and yellow light, and may include two films of a blue light filter film and a yellow light filter film arranged in layers. The blue light filter film may include alternately arranged multilayer films of two materials with different refractive indexes, and the two materials may be selected from gallium nitride, titanium oxide, aluminum oxide, indium tin oxide, silicon oxide, and silicon nitride. At least one of them. The yellow light filter film may include alternately arranged multilayer films of two materials with different refractive indices. The two materials may be selected from gallium nitride, titanium oxide, aluminum oxide, indium tin oxide, silicon oxide, and nitride. Silicon etc. In other embodiments, the light adjusting element 50b is a composite film that filters blue and yellow light.

As shown in FIG. 1, in the first embodiment of the present invention, the light adjusting element 50 a or 50 b is disposed between the lower polarizer 19 and the backlight module 30. The light adjusting element 50a or 50b is formed on the surface of the lower polarizer 19 near the backlight module 30 by attaching, coating or coating, or formed on the backlight module 30 near the lower surface. The surface of the polarizer 19; or the adjustment material is doped into a transparent base material to form a base layer, and the base layer is directly disposed between the lower polarizer 19 and the backlight module 30.

As shown in FIG. 2, a schematic diagram of a display device 100b according to the second embodiment of the present invention. The display device 100b is similar to the display device 100a of the first embodiment, that is to say, the description of the display device 100a can basically be applied to the display device 100b, in particular, the transparent cover 20, The structures of the upper polarizer 11, the color filter substrate 13, the liquid crystal layer 15, the TFT substrate 17, the lower polarizer 19, and the backlight module 30 are the same as those in the display device 100a, and will not be repeated here. However, the main difference between the display device 100b and the display device 100a of the first embodiment is that in the second embodiment, the light adjusting element 50a or 50b is disposed between the lower polarizer 19 and the TFT substrate 17. The light adjusting element 50a or 50b is formed on the surface of the lower polarizer 19 close to the TFT substrate 17 by attaching, coating, or plating, or formed on the TFT substrate 17 close to the lower polarizer. 19; or the adjustment material is doped into a transparent base material to form a base layer, and the base layer is directly disposed between the lower polarizer 19 and the TFT substrate 17.

As shown in FIG. 3, a schematic diagram of a display device 100c according to the third embodiment of the present invention. The display device 100c is similar to the display device 100a of the first embodiment, that is to say, the description of the display device 100a can basically be applied to the display device 100c, in particular, the transparent cover 20, The structures of the upper polarizer 11, the color filter substrate 13, the liquid crystal layer 15, the TFT substrate 17, the lower polarizer 19, and the backlight module 30 are the same as those in the display device 100a, and will not be repeated here. However, the main difference between the display device 100c and the display device 100a of the first embodiment is that in the third embodiment, the light adjusting element 50a or 50b is disposed between the upper polarizer 11 and the color filter substrate 13. between. The light adjusting element 50a or 50b is formed on the surface of the color filter substrate 13 close to the upper polarizer 11, or formed on the upper polarizer 11 close to the The surface of the color filter substrate 13; or the adjustment material is doped on a transparent base material to form a base layer, and the base layer is directly disposed between the upper polarizer 11 and the color filter substrate 13.

As shown in FIG. 4, a schematic diagram of a display device 100d according to the fourth embodiment of the present invention. The display device 100d is similar to the display device 100a of the first embodiment, that is to say, the description of the display device 100a can basically be used for the display device 100d, in particular, the transparent cover 20, The structures of the upper polarizer 11, the color filter substrate 13, the liquid crystal layer 15, the TFT substrate 17, the lower polarizer 19, and the backlight module 30 are the same as those in the display device 100a, and will not be repeated here. However, the main difference between the display device 100d and the display device 100a of the first embodiment is that in the fourth embodiment, the light adjusting element 50a or 50b is disposed between the upper polarizer 11 and the transparent cover 20 . The light adjusting element 50a or 50b is formed on the surface of the transparent cover plate 20 close to the upper polarizer 11 by attaching, coating or coating, or is formed on the upper polarizer 11 close to the transparent The surface of the cover plate 20; or the adjustment material is doped into a transparent base material to form a base layer, and the base layer is directly disposed between the upper polarizer 11 and the transparent cover plate 20.

As shown in FIG. 5, a schematic diagram of a display device 100e according to the fifth embodiment of the present invention. The display device 100e is similar to the display device 100a of the first embodiment, that is to say, the description of the display device 100a can basically be used for the display device 100e, in particular, the transparent cover 20, The structures of the upper polarizer 11, the color filter substrate 13, the liquid crystal layer 15, the TFT substrate 17, the lower polarizer 19, and the backlight module 30 are the same as those in the display device 100a, and will not be repeated here. However, the main difference between the display device 100e and the display device 100a of the first embodiment is that: in the fifth embodiment, the light adjusting element 50a or 50b is disposed on a side of the transparent cover 20 away from the upper polarizer 11 side. The light adjusting element 50a or 50b is formed on the surface of the transparent cover plate 20 away from the upper polarizer 11 by attaching, coating, or plating; or is doped with an adjusting material on a transparent base material A base layer is formed, and the base layer is directly arranged on the side of the transparent cover plate 20 away from the upper polarizer 11.

As shown in FIG. 6, a schematic diagram of a display device 100f according to a sixth embodiment of the present invention. In the embodiment, the light adjusting element 50a or 50b is disposed in the backlight module 30. The backlight module 30 is of a direct type, which includes a reflective sheet 32, a diffusion film 34, a brightness enhancement film 36, etc. laminated in sequence, and also includes a plurality of white LEDs 31, wherein the reflective sheet 32 and the diffusion film 34 are arranged at intervals. The plurality of white LEDs 31 penetrate through the reflective sheet 32 and face the diffusion film 34 and are arranged at intervals. It is understandable that a color conversion film (not shown in the figure) and other optical films conventionally used in the art, such as a color conversion film (not shown in the figure), which is laminated with the diffusion film 34 and the brightness enhancement film 36, may be arranged above the reflective sheet 32. The light adjusting element 50 a or 50 b can be disposed on any film layer located on the side of the plurality of white LEDs away from the reflective sheet 32, for example, disposed on the diffusion film 34 or the brightness enhancement film 36. In this embodiment, the light adjusting element 50 a or 50 b is disposed between the diffusion film 34 and the brightness enhancement film 36. The light adjusting element 50a or 50b is formed on the surface of the brightness enhancement film 36 close to the diffusion film 34 by attaching, coating or plating, or formed on the diffusion film 34 close to the brightness enhancement film 36; or the adjustment material is doped to a transparent base material to form a base layer, and the base layer is directly disposed between the diffusion film 34 and the brightness enhancement film 36.

As shown in FIG. 7, a schematic diagram of a display device 100g according to a seventh embodiment of the present invention. In the embodiment, the light adjusting element 50a or 50b is disposed in the backlight module 30. The backlight module 30 is of an edge type, which includes a reflective sheet 32, a light guide plate 33, a diffusion film 34, and a brightness enhancement film 36 stacked in sequence, and also includes a plurality of white LEDs 31. The plurality of white light LEDs 31 are arranged between the reflective sheet 32 and the diffusion film 34 and face the side end of the light guide plate 33. It is understandable that a color conversion film (not shown in the figure) and other optical films conventionally used in the art such as a color conversion film (not shown in the figure) laminated with the diffusion film 34 and the brightness enhancement film 36 can be arranged above the light guide plate 33. The light adjusting element 50 a or 50 b can be disposed on any film layer located on the side of the light guide plate 33 away from the reflective sheet 32, for example, disposed on the diffusion film 34 or the brightness enhancement film 36. In this embodiment, the light adjusting element 50 a or 50 b is disposed between the diffusion film 34 and the brightness enhancement film 36. The light adjusting element 50a or 50b is formed on the surface of the brightness enhancement film 36 close to the diffusion film 34 by attaching, coating or plating, or formed on the diffusion film 34 close to the brightness enhancement film 36; or the adjustment material is doped to a transparent base material to form a base layer, and the base layer is directly disposed between the diffusion film 34 and the brightness enhancement film 36.

The invention uses a specific white LED in the display device with a light adjustment element that filters out specific wavelength blue light, yellow light or blue light, which can effectively reduce the light damaging the eyes emitted from the display device, thereby realizing the effect of protecting the eyes. It can also improve the color saturation of the display screen.

The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. The up, down, left, and right directions shown in the figures are only for ease of understanding, although the present invention has been described in detail with reference to the preferred embodiments. A person of ordinary skill should understand that the technical solution of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solution of the present invention.

100a, 100b, 100c, 100d, 100e, 100f, 100g: display device 10: Display panel 30: Backlight module 20: Transparent cover 11: Upper polarizer 13: Color filter substrate 15: liquid crystal layer 17: TFT substrate 19: Lower polarizer 31: White LED 311: Blu-ray chip 313: Fluorescent material 50a, 50b: light adjustment components 32: reflective sheet 34: Diffusion film 36: Brightening film 33: Light guide plate

FIG. 1 is a schematic top view of a display device according to a first embodiment of the invention.

FIG. 2 is a schematic top view of a display device according to a second embodiment of the invention.

FIG. 3 is a schematic top view of a display device according to a third embodiment of the invention.

4 is a schematic top view of a display device according to a fourth embodiment of the invention.

5 is a schematic top view of a display device according to a fifth embodiment of the invention.

6 is a schematic top view of a display device according to a sixth embodiment of the invention.

FIG. 7 is a schematic top view of a display device according to a seventh embodiment of the invention.

FIG. 8 is a graph of light transmittance of a light adjusting element according to an embodiment.

FIG. 9 is a graph of light transmittance of a light adjusting element according to another embodiment.

100a: display device

10: Display panel

30: Backlight module

20: Transparent cover

11: Upper polarizer

13: Color filter substrate

15: liquid crystal layer

17: TFT substrate

19: Lower polarizer

50a, 50b: light adjustment components

Claims (9)

A display device is improved in that it includes: Display panel A backlight module laminated with the display panel, the backlight module includes a plurality of white light LEDs, each white light LED includes a blue light chip and a yellow fluorescent material packaged on the blue light chip; and A light adjusting element, which is arranged on the display panel or on the backlight module, the light adjusting element has a transmittance of no more than 10% for blue light with a wavelength below 450nm, and has no transmittance for blue light with a wavelength above 470nm Less than 90%; the light adjusting element is also used to reduce the penetration of yellow light with a wavelength between 575nm and 595nm. The display device according to claim 1, wherein: the light adjusting element includes two films, a blue light filter film and a yellow light filter film, which are laminated; the blue light filter film includes two layers of alternately arranged multilayer films of two different materials. Different materials are selected from at least one of gallium nitride, titanium oxide, aluminum oxide, indium tin oxide, silicon oxide, and silicon nitride; the yellow light filter film includes a multilayer film of two different materials alternately arranged, the The two materials are selected from at least one of gallium nitride, titanium oxide, aluminum oxide, indium tin oxide, silicon oxide, and silicon nitride. The display device according to claim 1, wherein: the light transmittance curve of the light adjusting element for yellow light presents a concave peak, wherein the abscissa of the light transmittance curve is the wavelength, the ordinate is the transmittance, and the center of the concave peak Located between 575nm and 595nm, the width of the concave peak is 15-30nm, and the transmittance of yellow light reaches a minimum of 60% at the center of the concave peak. The display device according to claim 1, wherein: the display panel includes a transparent cover plate, an upper polarizer, a color filter substrate, a liquid crystal layer, a TFT substrate, and a lower polarizer that are stacked in sequence, wherein the lower polarizer is close to the backlight mold Group, the light adjusting element is arranged between the lower polarizer and the backlight module; or between the lower polarizer and the TFT substrate; or between the upper polarizer and the color filter substrate Or between the upper polarizer and the transparent cover plate; or the transparent cover plate is away from the side of the upper polarizer. The display device according to claim 1, wherein: the light adjusting element is arranged in the backlight module. A display device, which includes: Display panel A backlight module laminated with the display panel, the backlight module including a plurality of white light LEDs, each white light LED including a blue light chip and a red fluorescent material and a green fluorescent material packaged on the blue light chip; and A light adjusting element, which is arranged on the display panel or on the backlight module, the light adjusting element has a transmittance of no more than 10% for blue light with a wavelength below 450nm, and has no transmittance for blue light with a wavelength above 470nm Less than 90%. The display device according to claim 6, wherein: the light adjusting element includes alternately arranged multilayer films of two different materials, and the two different materials are selected from gallium nitride, titanium oxide, aluminum oxide, and indium tin oxide. Oxide, silicon oxide, silicon nitride. The display device according to claim 6, wherein: the display panel includes a transparent cover plate, an upper polarizer, a color filter substrate, a liquid crystal layer, a TFT substrate, and a lower polarizer that are stacked in sequence, wherein the lower polarizer is close to the backlight mold Group, the light adjusting element is arranged between the lower polarizer and the backlight module; or between the lower polarizer and the TFT substrate; or between the upper polarizer and the color filter substrate Or between the upper polarizer and the transparent cover plate; or the transparent cover plate is away from the side of the upper polarizer. The display device according to claim 6, wherein: the light adjusting element is provided in the backlight module.

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