JP2020144362A - Display device - Google Patents

Abstract

To provide a display device which offers reduce color and brightness irregularity while minimizing brightness reduction.SOLUTION: A display device 10 is provided, comprising a display panel 20 for displaying images and a tabular protective member 15 for protecting the display panel 20. The protective member 15 has a pair of flat surfaces, of which a flat surface 16 on the display panel 20 side is provided with a light-transmissive laminated film 80 comprising multiple films 80A, 80B having different refractive indices.SELECTED DRAWING: Figure 1

Description

The present invention relates to a display device.

Conventionally, a liquid crystal panel used in a portable electronic device such as a smartphone is provided with a protective member (for example, a cover glass) so as to cover the display surface thereof, and Patent Document 1 discloses an example thereof. The liquid crystal display device described in Patent Document 1 suppresses the shift of the display color to a warm color or the occurrence of color unevenness by containing a cold color dye in the adhesive that adheres the cover glass to the liquid crystal panel. It is supposed to be done.

Japanese Unexamined Patent Publication No. 2014-957763

However, in the liquid crystal display device described in Patent Document 1, since light in a specific wavelength range is absorbed by the cold color dye, the effect of the decrease in brightness due to the adhesive is large, and as a result, the brightness of the liquid crystal display device becomes low. It will be reduced. Further, since the adhesive is uniformly applied over the surface and its film thickness is small, the effect of alleviating color unevenness has to be limited.

The present invention has been completed based on the above circumstances, and an object of the present invention is to reduce color unevenness and brightness unevenness while suppressing a decrease in brightness.

(1) One embodiment of the present invention includes a display panel for displaying an image and a plate-shaped protective member for protecting the display panel, and the display panel among the pair of plate surfaces of the protective member. This is a display device provided with a light-transmitting laminated film having a plurality of films having different refractive indexes on the plate surface on the side.

(2) Further, in an embodiment of the present invention, in addition to the configuration of (1) above, the laminated film has a film thickness such that the wavelength of the light incident on the laminated film in the visible light region is changed. It is a set display device.

(3) Further, in an embodiment of the present invention, in addition to the configuration of (2) above, the laminated film is a display device having a film thickness distribution according to the chromaticity distribution of light incident on the laminated film. Is.

(4) Further, in an embodiment of the present invention, in addition to the configuration of (1) above, the laminated film does not change the wavelength of the light incident on the laminated film in the visible light region, but changes the brightness. It is a display device in which the film thickness is set so as to be used.

(5) Further, in an embodiment of the present invention, in addition to the configuration of (4) above, the laminated film is a display device having a film thickness distribution according to the brightness distribution of light incident on the laminated film. is there.

(6) Further, in an embodiment of the present invention, in addition to the configuration of any one of (1) to (5) above, the laminated film is alternately composed of a film containing silicon oxide and a film containing niobium oxide. It is a display device having a laminated structure.

(7) Further, in an embodiment of the present invention, in addition to the configuration according to any one of (1) to (6) above, the laminated film is formed on a glass substrate which is a base material of the protective member. It is a display device.

(8) Further, in an embodiment of the present invention, in addition to the configuration of any one of (1) to (7) above, the display panel has a display area in which an image is displayed and a non-display in which an image is not displayed. A display device having a region and the laminated film is provided in a region superposed on the display region, while a light-shielding film is provided in the region superposed on the non-display region.

(9) Further, in an embodiment of the present invention, in addition to the configuration according to any one of (1) to (8) above, a polarizing plate that imparts a polarizing action to the surface of the display panel on the protective member side. Is provided, and the polarizing plate and the protective member are display devices that are bonded by a film-shaped adhesive member.

(10) Further, in an embodiment of the present invention, in addition to the configuration according to any one of (1) to (9) above, the display panel is a display device which is a liquid crystal panel.

(11) Further, an embodiment of the present invention is a display device including a lighting device that irradiates the display panel with light in addition to the configuration of any of the above (1) to (10).

According to the present invention, it is possible to reduce color unevenness and brightness unevenness while suppressing a decrease in brightness.

Sectional drawing of the liquid crystal display device which concerns on Embodiment 1. Top view of cover glass Cross section of cover glass The figure which shows the chromaticity distribution of the light incident on a laminated film The figure which shows the degree of the color adjustment action of a laminated film in a cover glass The figure which shows the chromaticity distribution of the emitted light of a cover glass Sectional drawing of the cover glass which concerns on Embodiment 2. The figure which shows the luminance distribution of the light incident on a laminated film The figure which shows the degree of the brightness adjustment action of a laminated film in a cover glass The figure which shows the luminance distribution of the emitted light of a cover glass

<Embodiment 1>
The first embodiment will be described with reference to FIGS. 1 to 4C. In this embodiment, a liquid crystal display device (an example of a display device) 10 will be illustrated. A part of each drawing shows an X-axis, a Y-axis, and a Z-axis, and each axis direction is drawn so as to be a common direction in each drawing. Further, the + Z-axis direction (liquid crystal panel 20 side) is the front side of the liquid crystal display device 10, and the −Z axis direction (backlight device 30 side) is the back side.

As shown in the cross-sectional view of FIG. 1, the liquid crystal display device 10 is arranged on a liquid crystal panel (an example of a display panel) 20 for displaying an image and a liquid crystal panel 20 on the back side of the liquid crystal panel 20. A backlight device (an example of a lighting device) 30 for irradiating light for the purpose is provided. The liquid crystal display device 10 has a rectangular shape when viewed on a flat surface, and is mainly used for portable electronic devices such as smartphones, and the screen size is generally classified as small.

As shown in FIG. 1, the backlight device 30 exerts a predetermined optical action on the LED 52 (an example of a light source), the plate-shaped light guide plate 60 into which the light from the LED 52 is incident, and the light emitted from the light guide plate 60. The optical sheet 33 to be applied, the reflective sheet 70 that reflects the leaked light to the light source plate 60 side, and the frame-shaped frame 36 that surrounds the LED 52, the light source plate 60, the optical sheet 33, and the like are provided. The light emitted from the LED 52 enters the light guide plate 60 from the opposite incoming light end faces 61 and is guided to the liquid crystal panel 20 side. That is, in the backlight device 30 according to the present embodiment, the light of the LED 52 is a one-sided light input type edge light type (side light type) in which the light of the LED 52 is input from one side to the light guide plate 60.

The LEDs 52 are mounted on an LED substrate 51 extending along the X-axis direction, and a plurality of LEDs are arranged in a row on the LED substrate 51 at equal intervals. The LED substrate 51 is made of an insulating material and has a flexible film shape, and is arranged so as to be sandwiched between the light guide plate 60 and the optical sheet 33 as shown in FIG.

The light guide plate 60 is made of a synthetic resin material having a refractive index sufficiently higher than that of air and being substantially transparent. The light guide plate 60 has a plate shape and is thicker than the optical sheet 33 as shown in FIG. The light guide plate 60 introduces the light emitted from the LED 52 along the Y-axis direction from one side surface (light entry end surface) 61, and is raised so as to face the optical sheet 33 side while propagating the light internally. It is emitted from the plate surface (light emitting plate surface) 63 on the front side.

As shown in FIG. 1, the reflective sheet 70 is arranged on the back surface 67 side of the light guide plate 60, and is in the form of a synthetic resin sheet, and the surface thereof is white with excellent light reflectivity. The reflective sheet 70 reflects the light leaked from the back surface 67 of the LED 52 and the light guide plate 60 toward the light guide plate 60.

The optical sheet 33 has a flexible sheet shape, and is arranged between the liquid crystal panel 20 and the light guide plate 60 as shown in FIG. 1 to determine the light emitted from the light guide plate 60. Is emitted toward the liquid crystal panel 20 while imparting the optical action of. As the optical sheet 33, for example, a diffusion sheet that diffuses light, a prism sheet that imparts a condensing action to light, a wavelength conversion sheet that converts light to another wavelength, or the like can be used, and these are laminated. May be used.

As shown in FIG. 1, the liquid crystal panel 20 contains a pair of substrates 21 and 22, and liquid crystal molecules which are sandwiched between the internal spaces between the two substrates 21 and 22 and whose optical characteristics change with the application of an electric field. It includes a liquid crystal layer 24 and a sealing portion 25 that encloses the liquid crystal layer 24 by interposing between the two substrates 21 and 22 so as to surround the liquid crystal layer 24. One substrate (array substrate) 22 is provided with a switching element (for example, a thin film transistor) connected to source wiring and gate wiring orthogonal to each other, a pixel electrode connected to the switching element, an alignment film, and the like. On the other substrate (CF substrate) 21, a color filter, counter electrodes, an alignment film, and the like in which colored portions such as R (red), G (green), and B (blue) are arranged in a predetermined arrangement are provided. It is provided. Further, polarizing plates 26 and 27 for imparting a polarizing action are arranged on the outside of both substrates 21 and 22, respectively.

The liquid crystal panel 20 has a rectangular shape in a plan view, the central portion of the screen is a display area (active area) AA on which an image is displayed, and the frame-shaped peripheral edge portion surrounding the display area is a non-image display area. Display area (non-active area) NAA. As shown in FIG. 1, the non-display area NAA in the array board 22 includes a driver (drive circuit unit) 13 as a component for supplying various signals to the display area AA, and a flexible board which is a flexible wiring board. 14 is implemented.

As shown in FIG. 1, the liquid crystal panel 20 and the backlight device 30 are fixed by a frame-shaped fixing tape 10FT having a light-shielding property. After both are fixed, a plate-shaped cover glass 15 (an example of a protective member) is adhered to the front side of the liquid crystal panel 20 so as to cover the entire area. The glass substrate 15GS, which is the base material of the cover glass 15, is made of tempered glass having high mechanical strength and impact resistance and excellent translucency, and protects the liquid crystal panel 20. The back surface of the cover glass 15 and the front surface of the liquid crystal panel 20 (polarizing filter 26) are bonded by a transparent optical adhesive film 12 (OCA (Optical Clear Adhesive), an example of an adhesive member). By using the film-like member, the bonding process between the cover glass 15 and the liquid crystal panel 20 becomes easier than in the case of applying the adhesive as in the prior document 1.

As shown in FIGS. 1 and 2, the cover glass 15 is provided on the glass substrate 15GS and the plate surface 16 on the liquid crystal panel 20 side of the pair of plate surfaces, and has a light transmissive shape when viewed in a plane. It has a laminated film 80 and a light-shielding film 90 provided so as to surround the laminated film 80 and forming a frame shape. The light-shielding film 90 is made of a light-shielding material such as titanium (Ti) so that various members (driver 13 and the like) arranged on the outer peripheral edge of the liquid crystal display device 10 are not visible from the outside. Further, the light-shielding film 90 prevents light incident on the laminated film 80 from the liquid crystal panel 20 side from leaking to the outer peripheral edge portion outside the laminated film 80. The light-shielding film 90 is formed so as to overlap the non-display area NAA, and the laminated film 80 is formed so as to overlap the display area AA. In other words, the light-shielding portion 90 defines the boundary between the display area AA and the non-display area NAA of the liquid crystal panel 20.

As shown in FIG. 3, the laminated film 80 is formed so that a plurality of transparent films 80A and 80B having different refractive indexes are alternately laminated. Specifically, for example, the first film 80A containing silicon oxide (SiO _x ) and the second film 80B containing niobium oxide (Nb _x O _y ) are alternately laminated to form a laminated film. By doing so, the light incident on the laminated film 80 from the liquid crystal panel 20 side is refracted at each interface having a different refractive index, and a part of the light is reflected. As a result, when the film thickness of each layer of the laminated film 80 and the number of layers (that is, the film thickness d80 of the laminated film 80) are appropriately set, the wavelength of the light incident on the laminated film 80 changes and is emitted. .. Note that the change in wavelength means that when light contains a plurality of wavelength components, the shape of the wavelength spectrum (intensity (luminance) distribution of each wavelength component) changes. As a result, the laminated film 80 can change the chromaticity by changing the wavelength of the transmitted light in the visible light region. That is, the laminated film 80 imparts a color adjusting action.

By the way, the light emitted from the liquid crystal panel 20 (light incident on the laminated film 80) may cause color unevenness in the plane. This is caused by color unevenness of the emitted light of the backlight device 30, distortion when the liquid crystal panel 20 and the backlight device 30 are assembled, and the like. An example thereof is shown in FIG. 4A. In FIG. 4A, the chromaticity of the light incident on the laminated film 80 is different in the vicinity of the four corners A1 of the display region AA. That is, the chromaticity of the laminated film 80 differs depending on the in-plane position (x, y), and color unevenness occurs. Since the chromaticity corresponds to the wavelength λ1 of the light incident on the laminated film 80, the chromaticity distribution corresponds to the wavelength distribution λ1 (x, y). If the laminated film 80 is not provided, the light having the wavelength distribution λ1 (x, y) passes through the cover glass 15 as it is and is displayed to the outside, so that the color unevenness shown in FIG. 4A is visually recognized. ..

Therefore, in the present embodiment, the chromaticity distribution of the emitted light of the liquid crystal panel 20 is measured in advance, and the film thickness distribution d80 (x, y) of the laminated film 80 is set based on the measurement. More specifically, for example, after fixing the liquid crystal panel 20 and the backlight device 30 with the fixing tape 10FT, the display color of the emitted light of the liquid crystal panel 20 is measured with a colorimeter or the like at the manufacturing stage where the cover glass 15 is not adhered. I will do it. Next, the film thickness distribution d80 (x, y) of the laminated film 80 is set based on the measurement information, and the laminated film 80 corresponding to the film thickness distribution d80 (x, y) is applied to the glass substrate 15GS of the cover glass 15. Film on top. Then, the cover glass 15 is adhered to the liquid crystal panel 20.

The degree of the color adjusting action of the laminated film 80 changes depending on the difference in the film thickness d80 of the laminated film 80 (at least one of the film thickness of each layer and the number of layers). Therefore, the film thickness distribution d80 (x, y) of the laminated film 80 can be set so that the laminated film 80 produces the color adjusting action as shown in FIG. 4B based on the chromaticity distribution of FIG. 4A. This color adjusting action is such that the wavelength λ2 of the light transmitted through the laminated film 80 does not depend on the in-plane position (x, y) at least in the visible light region and is substantially the same over the in-plane. As a result, the chromaticity of the emitted light from the cover glass 15 (that is, the emitted light of the liquid crystal display device 10) becomes uniform in the plane as shown in FIG. 4C, and the color unevenness is suppressed. Of the color unevenness, those caused by distortion or the like when the liquid crystal panel 20 and the backlight device 30 are assembled differ depending on the assembled state. According to the present embodiment, the chromaticity distribution of the light incident on the laminated film 80 can be measured in advance, and the color unevenness can be suppressed accordingly. Therefore, the color unevenness depending on the individual assembled state can be effectively solved. become.

The laminated film 80 is provided by forming a film on a glass substrate 15GS by a sputtering method, a vapor deposition method, or the like. By changing the film forming conditions of the laminated film 80 according to the in-plane position (x, y), the laminated film 80 can have a desired film thickness distribution d80 (x, y). For example, in the case of the sputtering method, it is possible to form a laminated film 80 having a desired film thickness distribution d80 (x, y) by controlling the transport speed of the glass substrate 15GS or controlling the applied voltage of the sputtering apparatus. The in-plane may be divided into a plurality of blocks, and film formation conditions may be set for each block.

As described above, the liquid crystal display device 10 according to the present embodiment includes a liquid crystal panel 20 for displaying an image and a plate-shaped cover glass 15 for protecting the liquid crystal panel 20, and a pair of cover glasses 15. Of the plate surfaces, the plate surface 16 on the liquid crystal panel 20 side is provided with a light-transmitting laminated film 80 having a plurality of films 80A and 80B having different refractive indexes.

By doing so, the light emitted from the liquid crystal panel 20 passes through the laminated film 80 of the cover glass 15. The laminated film 80 includes a plurality of films 80A and 80B having different refractive indexes, and if the film thickness d80 is appropriately set, the wavelength of the light incident on the laminated film 80 can be changed, so that the light is transmitted. It becomes possible to adjust the chromaticity of the light. Since the laminated film 80 refracts light at the interface between the laminated films 80A and 80B and does not cause an absorbing action unlike the adhesive of Patent Document 1, the influence of the decrease in brightness is small. Further, as a color adjusting means of the emitted light, a method of adjusting the emission color of the LED 52, adjusting the color filter of the CF substrate 21, or forming a pattern for color adjustment on the reflective sheet 70 is known. , Both are greatly affected by the decrease in brightness. When a pattern is formed on the reflective sheet 70, there is also a problem that dust is easily generated from the pattern due to friction during vibration and the pattern is easily deteriorated. According to the liquid crystal display device 10 according to the present embodiment, it is possible to adjust the color of the emitted light without causing such a problem.

Further, the laminated film 80 is assumed to have a film thickness distribution d80 (x, y) according to the chromaticity distribution (wavelength distribution) of the light incident on the laminated film 80. Since the color adjusting action of the laminated film 80 changes according to the film thickness d80 of the laminated film 80 (at least one of the film thickness of each layer and the number of layers), the light incident on the laminated film 80 has color unevenness. By providing the laminated film 80 to have a film thickness distribution d80 (x, y) according to the chromaticity distribution, color unevenness can be suppressed. Further, among the color unevenness, those caused by distortion or the like when the liquid crystal panel 20 and the backlight device 30 are assembled differ depending on the assembled state. According to the present embodiment, the chromaticity distribution of the light incident on the laminated film 80 can be measured in advance, and the color unevenness can be suppressed accordingly. Therefore, it is effective for the color unevenness depending on the individual assembled state. Can act.

<Embodiment 2>
The cover glass 115 according to the second embodiment of the present invention will be described with reference to FIGS. 5 to 6C. In the second embodiment, the film thickness d180 of the laminated film 180 is set so as to change the brightness of the light incident on the laminated film 180 without changing the wavelength in the visible light region. It should be noted that duplicate description of the same structure, action and effect as in the first embodiment will be omitted.

As shown in FIG. 5, the laminated film 180 is formed so that a plurality of transparent films 180A and 180B having different refractive indexes are alternately laminated. Specifically, for example, the first film 180A containing silicon oxide (SiO _x ) and the second film 180B containing niobium oxide (Nb _x O _y ) are alternately laminated to form a laminated film. Here, if the thickness d180 (thickness of each layer and the number of layers) of the laminated film 180 is appropriately set, the wavelength in the visible light region (the light contains a plurality of wavelength components) with respect to the light incident on the laminated film 180. In some cases, only the brightness can be adjusted without changing the shape of the wavelength spectrum). In other words, the brightness can be adjusted uniformly not only in a specific wavelength range but also in the entire visible light range.

The laminated film 180 is assumed to have a film thickness distribution d180 (x, y) according to the luminance distribution of the light incident on the laminated film 180. Since the brightness adjusting action of the laminated film 180 changes according to the film thickness d180, when the light incident on the laminated film 180 has brightness unevenness, the laminated film 180 has a film thickness distribution d180 according to the brightness distribution ( By having x, y), the uneven brightness can be reduced. The causes of the brightness unevenness are the brightness unevenness of the emitted light of the backlight device 30, the distortion when the liquid crystal panel 20 and the backlight device 30 are assembled, and the like, which occur as shown in FIG. 6A, for example. FIG. 6A shows the luminance distribution of the light emitted from the liquid crystal panel 20 (light incident on the laminated film 180) in the case of black display. As shown in FIG. 6A, the brightness of the light incident on the laminated film 180 is large at the arrangement position A2 of the LED 52 and the vicinity of the two corners A1 of the display area AA, causing white unevenness. There is. That is, the brightness E1 of the laminated film 180 differs depending on the position (x, y) in the plane, and the brightness unevenness occurs. If the laminated film 180 is not provided, the light of the luminance distribution E1 (x, y) passes through the cover glass 15 as it is and is displayed to the outside, so that the luminance unevenness corresponding to FIG. 6A is visually recognized.

Therefore, in the present embodiment, the brightness distribution of the emitted light of the liquid crystal panel 20 is measured in advance, and the film thickness distribution d180 (x, y) of the laminated film 180 is set based on the measurement. More specifically, for example, after fixing the liquid crystal panel 20 and the backlight device 30 with the fixing tape 10FT, the brightness of the emitted light of the liquid crystal panel 20 is measured at the manufacturing stage where the cover glass 115 is not adhered. Next, the film thickness distribution d180 (x, y) of the laminated film 180 is set so as to suppress the brightness unevenness based on the measurement information, and the laminated film 180 corresponding to the film thickness distribution d180 (x, y) is covered. A film is formed on the glass substrate 15GS of the glass 115. Then, the cover glass 115 is adhered to the liquid crystal panel 20. The film forming method of the laminated film 180 and the method of changing the film forming conditions are the same as those of the laminated film 80 of the first embodiment.

Next, the action and effect of the laminated film 180 according to the present embodiment will be described. The degree of the brightness adjusting action of the laminated film 180 changes depending on the difference in the film thickness d180 of the laminated film 180 (at least one of the film thickness of each layer and the number of layers). Therefore, when the film thickness distribution d180 (x, y) of the laminated film 180 is set so as to suppress the luminance unevenness based on the luminance distribution of FIG. 6A, the laminated film 180 causes the luminance adjusting action shown in FIG. 6B. .. As a result, the brightness of the light emitted from the cover glass 15 (that is, the light emitted from the liquid crystal display device 10) becomes uniform in the plane as shown in FIG. 6C, and the uneven brightness is suppressed. In FIG. 6C, the boundary between the display area AA and the non-display area NAA is shown by a white line to clearly show the boundary, but this boundary is also actually displayed in black.

Among the brightness irregularities, those caused by distortion or the like when the liquid crystal panel 20 and the backlight device 30 are assembled differ depending on the assembled state. According to the present embodiment, since the brightness distribution of the light incident on the laminated film 180 can be measured in advance and the brightness unevenness can be suppressed accordingly, the brightness unevenness depending on the individual assembled state can be effectively solved. Further, when the minimum brightness is E1 _min in the luminance distribution E1 (x, y) of the incident light of the laminated film 180, the luminance distribution E2 (x, y) of the emitted light is uniformly E1 _min over the plane. By adjusting the brightness, it is possible to suppress the brightness unevenness and prevent the brightness from becoming darker than the minimum brightness E1 _min . In this way, the influence of the decrease in brightness can be minimized.

<Other embodiments>
The present invention is not limited to the embodiments described in the above description and drawings, and for example, the following embodiments are also included in the technical scope of the present invention.

(1) In each of the above embodiments, an example in which two types of films, a first film and a second film, are alternately laminated as laminated films is shown, but even if three or more types of films are alternately and repeatedly laminated. I do not care.

(2) In each of the above embodiments, the flat size of the cover glass is larger than that of the liquid crystal panel, but the size may be smaller than that of the liquid crystal panel. In such a case, the cover glass may not be provided with a light-shielding film, and a laminated film may be provided on the entire plate surface.

(3) In each of the above embodiments, an example in which a light-shielding film is provided on the frame portion surrounding the laminated film on the glass substrate is shown, but a reflective film or the like for displaying the black color of the frame portion darker is a light-shielding film. It may be laminated on.

(4) In each of the above embodiments, an example in which the OCA for adhering the cover glass and the polarizing plate is square is shown, but the OCA is formed in a frame shape so as to connect the outer peripheral edges of each. It doesn't matter.

(5) In the above-described embodiment, as the backlight device, an example of a one-sided light input type edge light type is shown, but a direct type or a double-sided light type edge light type may be used.

(6) In the above-described embodiment, the example in which the liquid crystal panel is rectangular is shown, but it may be non-square.

(7) In the above-described embodiment, the screen size of the liquid crystal panel is small, but the screen size is also applicable to medium to large liquid crystal panels.

(8) In the above-described embodiment, the protective member is a cover glass, but a protective plate made of transparent resin may be used.

(9) In the above-described embodiment, the LED substrate is arranged so as to be sandwiched between the light guide plate and the optical sheet, but it may be attached to a frame arranged in a frame shape or the like.

(10) In the above-described embodiment, the reflective sheet is white, but it may be silver or the like.

(11) In the above-described embodiment, the light-shielding film is made of a light-shielding material such as titanium, but black ink or the like may be used.

10 ... liquid crystal display device (display device), 12 ... OCA (adhesive member), 15,115 ... cover glass (protective member), 15GS ... glass substrate, 20 ... liquid crystal panel (display panel), 26 ... polarizing plate, 30 ... Backlight device (illumination device), 80,180 ... laminated film, 80A, 180A ... first film (film), 80B, 180B ... second film (film), 90 ... light-shielding film, AA ... display area, d80, d180 ... film thickness, NAA ... non-display area

Claims (11)

A display panel that displays images and
A plate-shaped protective member that protects the display panel is provided.
A display device in which a light-transmitting laminated film having a plurality of films having different refractive indexes is provided on the plate surface on the display panel side of the pair of plate surfaces of the protective member. The display device according to claim 1, wherein the laminated film has a film thickness set so as to change the wavelength of the light incident on the laminated film in the visible light region. The display device according to claim 2, wherein the laminated film has a film thickness distribution corresponding to a chromaticity distribution of light incident on the laminated film. The display device according to claim 1, wherein the laminated film has a film thickness set so as to change the brightness without changing the wavelength of the light incident on the laminated film in the visible light region. The display device according to claim 4, wherein the laminated film has a film thickness distribution corresponding to a brightness distribution of light incident on the laminated film. The display device according to any one of claims 1 to 5, wherein the laminated film has a structure in which a film containing silicon oxide and a film containing niobium oxide are alternately laminated. The display device according to any one of claims 1 to 6, wherein the laminated film is formed on a glass substrate which is a base material of the protective member. The display panel has a display area in which an image is displayed and a non-display area in which an image is not displayed.
While the laminated film is provided in a region that overlaps the display region,
The display device according to any one of claims 1 to 7, wherein a light-shielding film is provided in a region that overlaps with the non-display region. A polarizing plate that imparts a polarizing action is provided on the surface of the display panel on the side of the protective member.
The display device according to any one of claims 1 to 8, wherein the polarizing plate and the protective member are adhered to each other by a film-like adhesive member. The display device according to any one of claims 1 to 9, wherein the display panel is a liquid crystal panel. The display device according to any one of claims 1 to 10, further comprising a lighting device that irradiates the display panel with light.

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