JP2008085232A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device capable of displaying an image with high color reproducibility. <P>SOLUTION: On a side opposite to an observation side of the liquid crystal display unit 1, there is arranged a plane light source 20, which is provided with quasi white-light-emitting devices 22 each having a blue LED and a fluorescent layer, in which fluorescent materials for emitting fluorescent lights of colors other than blue are dispersed, to emit a quasi white light composed of a blue light emitted by the blue LED and fluorescent lights of colors other than blue emitted from the fluorescent materials. The plane light source 20 guides the emitted lights from the quasi white-light-emitting devices 22 through an optical guide plate 21 to provide illumination toward the liquid crystal display unit 1. There is further arranged an absorption filter 28 in an optical path from the quasi white-light-emitting devices 22 to the surface on the observation side of the liquid crystal display unit 1. The absorption filter 28 is formed of a multilayer film having a steep absorption characteristic to absorb a light in a wavelength zone between a green and a red light. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device.

  The liquid crystal display device includes a liquid crystal display element in which a plurality of pixels that control transmission of light are arranged in a matrix, and a liquid crystal display element that is disposed on a side opposite to an observation side of the liquid crystal display element, and illuminates the liquid crystal display element It is comprised by the surface light source which irradiates (refer patent document 1).

  As the surface light source of the liquid crystal display device, in order to reduce power consumption, a light emitting element made up of a light emitting diode and emitting light emitted from the light emitting element toward the liquid crystal display element is used. .

In the surface light source using the light emitting diode, in order to reduce the type and number of the light emitting diodes, the light emitting diode is provided on the emission side of the blue light emitting diode and the blue light emitting diode. A pseudo-white light emission that emits pseudo white light by blue light emitted from the blue light emitting diode and fluorescence of a color other than blue emitted from the fluorescent material. An element is used (see Patent Document 2).
JP 2000-112380 A JP 2006-108076 A

  However, a liquid crystal display device including a surface light source using a pseudo white light emitting element that emits pseudo white light by the blue light emitting diode and a fluorescent layer in which a fluorescent material emitting fluorescence of a color other than blue is dispersed, An image with high reproducibility could not be displayed.

  An object of the present invention is to provide a liquid crystal display device capable of displaying an image with high color reproducibility.

The liquid crystal display device of the present invention is
A liquid crystal display element in which a plurality of pixels for controlling light transmission are arranged in a matrix;
The blue light emitting diode, which is disposed on the opposite side of the liquid crystal display element from the observation side, includes a blue light emitting diode, and a fluorescent layer which is provided on the emission side of the blue light emitting diode and emits fluorescence of a color other than blue. A pseudo white light emitting element that emits pseudo white light composed of blue light emitted from the fluorescent layer and fluorescence of a color other than blue emitted from the fluorescent layer, and the liquid crystal display element is irradiated with light emitted from the pseudo white light emitting element. A surface light source to
It is arranged in at least one place in the light path from the pseudo-white light emitting element to the viewing side surface of the liquid crystal display element, and is composed of a multilayer film having steep absorption characteristics that absorbs light in the wavelength band between green and red. An absorption filter;
It is characterized by providing.

  The liquid crystal display device according to the present invention has a steep absorption characteristic that absorbs light in a wavelength band between green and red in at least one light path from the pseudo-white light emitting element to the observation side surface of the liquid crystal display element. Since an absorption filter made of a multilayer film having the above is disposed, an image with high color reproducibility can be displayed.

(First embodiment)
FIG. 1 is a perspective view of a liquid crystal display device according to a first embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of a part of the liquid crystal display device. The liquid crystal display element 1 in which the pixels 14 are arranged in a matrix and the observation light (upper side in FIGS. 1 and 2) of the liquid crystal display element 1 are arranged on the opposite side, and illumination light is directed toward the liquid crystal display element 1. The surface light source 20 which irradiates is provided.

  In the liquid crystal display element 1, a liquid crystal layer 4 is sealed between a pair of transparent substrates 2 and 3 that are arranged to face each other, and a plurality of pixels 14 are arranged in a matrix on the inner surfaces of the pair of substrates 2 and 3 that face each other. Transparent electrodes 5 and 7 are provided to be arranged and formed, and polarizing plates 12 and 13 are arranged on the outer surfaces of the pair of substrates 2 and 3, respectively.

  The liquid crystal display element 1 is an active matrix liquid crystal display element having a thin film transistor (hereinafter referred to as TFT) as an active element, and is formed on one of the pair of substrates 2 and 3, for example, on the inner surface of the substrate 2 opposite to the observation side. , A plurality of pixel electrodes 5 arranged in a matrix in the row direction (left and right direction of the screen) and the column direction (up and down direction of the screen), a plurality of TFTs 6 respectively corresponding to these pixel electrodes 5, and a plurality of TFTs in each row A plurality of scanning lines for supplying gate signals to the TFTs 6 and a plurality of signal lines (none of which are shown) for supplying data signals to the plurality of TFTs 6 in each column are provided, and the other substrate, that is, the substrate 3 on the observation side. Is provided with a single film-like counter electrode 7 facing the plurality of pixel electrodes 5.

  Although the TFT 6 is simplified in FIG. 2, the TFT 6 is provided on the substrate surface of the opposite substrate 2 and substantially entirely on the substrate surface so as to cover the gate electrode. A transparent gate insulating film, an i-type semiconductor film formed on the gate insulating film so as to face the gate electrode, and n-type semiconductor films on both sides of the i-type semiconductor film The plurality of pixel electrodes 5 are formed on the gate insulating film and connected to the source electrodes of the TFTs 6 corresponding to the pixel electrodes 5, respectively. .

  The plurality of scanning lines are formed on the substrate surface of the opposite substrate 2 along one side of each pixel electrode row, and are connected to the gate electrodes of the plurality of TFTs 6 in each row. The plurality of signal lines are formed on the gate insulating film along one side of each pixel electrode column, and are connected to the drain electrodes of the plurality of TFTs in each column.

  As shown in FIG. 1, the opposite substrate 2 has an overhanging portion 2 a that protrudes outward from the observation side substrate 3, and a plurality of protrusions 2 a provided on the inner surface of the opposite substrate 2. The scanning lines and the signal lines are connected to a display driver 18 made of an LSI mounted on the overhang portion 2a.

  On the other hand, on the inner surface of the observation-side substrate 3, three colors of red, green, and blue are associated with each of the plurality of pixels 10 including regions where the plurality of pixel electrodes 5 and the counter electrode 7 face each other. Filters 8R, 8G, and 8B are provided, and the counter electrode 7 is formed thereon.

  Further, alignment films 9 and 10 are formed on the inner surfaces of the pair of substrates 2 and 3 so as to cover the electrodes 5 and 7, respectively.

  The pair of substrates 2 and 3 are joined together via a frame-shaped sealing material 11 (see FIG. 1) surrounding the array region of the plurality of pixels 10, and the seal between the substrates 2 and 3 is joined. A liquid crystal layer 4 is sealed in a region surrounded by the material 11.

  The liquid crystal display element 1 includes a TN type or STN type in which the liquid crystal molecules of the liquid crystal layer 4 are twist-oriented between the pair of substrates 2 and 3, and the liquid crystal molecules are substantially perpendicular to the surfaces of the substrates 2 and 3. An aligned vertical alignment type, a non-twisted horizontal alignment type in which liquid crystal molecules are aligned in a direction substantially parallel to the substrates 2 and 3 with the molecular long axis aligned in one direction, and a bend alignment type in which liquid crystal molecules are bend aligned. Either of them is a ferroelectric or antiferroelectric liquid crystal display element, and the polarizing plates 12 and 13 on the outer surfaces of the pair of substrates 2 and 3 are arranged with their respective transmission axes directed in the direction in advance.

  The liquid crystal display element 1 is provided with electrodes 5 and 7 for forming a plurality of pixels 14 on the inner surfaces of a pair of substrates 2 and 3, respectively. A first electrode for forming a plurality of pixels on one inner surface, and a second electrode having a plurality of elongated electrode portions formed on the liquid crystal layer side of the first electrode so as to be insulated from the first electrode. And a lateral electric field control type of changing the alignment state of liquid crystal molecules by generating a horizontal electric field (electric field in a direction along the substrate surface) between these electrodes.

  The surface light source 20 is formed with an incident end face 21a for allowing light to enter at least one end face of a plate-like transparent member, and an exit face 21b for light incident from the incident end face 21a is provided on one of the two plate faces. A reflection surface 21c is formed on the other plate surface to reflect the light incident from the incident end surface 21a toward the emission surface 21b, and the emission surface 21b is opposite to the observation side of the liquid crystal display element 1. The light guide plate 21 disposed to face the surface of the light guide plate, and a plurality of light guides 21 arranged to face the incident end surface 21a of the light guide plate 21 and emit light toward the incident end surface 21a of the light guide plate 21 (3 in FIG. 1). ) Pseudo white light emitting elements 22.

  FIG. 3 is an enlarged side view of the surface light source 20 on the light emitting element arrangement side, and the surface light source 20 transmits light emitted from the plurality of pseudo white light emitting elements 22 (pseudo white light emission) through the light guide plate 21. Then, the liquid crystal display element 1 is irradiated with the light as indicated by the arrows.

  The light guide plate 21 of this embodiment totally reflects light incident from the incident end surface 21a at the interface between the reflective surface 21c and the outside air (air). The reflective surface 21c may be provided with a reflective film.

  FIG. 4 is an enlarged cross-sectional view of the pseudo white light-emitting element 22. The pseudo white light-emitting element 22 has a blue color at the center of the inner bottom surface of the box-shaped housing 23 having one surface made of a resin molded product open. A blue light-emitting diode (hereinafter referred to as a blue LED) 24 that emits light is disposed with its emission surface facing the open surface of the housing 23, and a transparent material (for example, transparent resin) 26 is placed in the housing 23. The phosphor layer 25 is filled with a particulate fluorescent material 27 that is excited by light emitted from the blue LED 24 and emits fluorescence of a color other than blue.

  That is, the pseudo-white light emitting element 22 includes a blue LED 24 and a fluorescent layer 25 provided on the emission side of the blue LED 24 in which a fluorescent material 27 that emits fluorescence of a color other than blue is dispersed in a transparent material 26. Thus, pseudo white light composed of blue light emitted from the blue LED 24 and fluorescence of a color other than blue emitted from the fluorescent material 27 is emitted.

  The fluorescent material 27 dispersed in the fluorescent layer 25 of the pseudo white light emitting element 22 is a yellow fluorescent material that emits yellow fluorescence. The pseudo white light is emitted by the yellow fluorescence emitted from the fluorescent material 27.

  Further, as shown in FIGS. 1 and 3, the liquid crystal display device is disposed between the incident end surface 21a of the light guide plate 21 of the surface light source 20 and the plurality of pseudo white light emitting elements 22, respectively. An absorption filter (hereinafter referred to as a multilayer filter) 28 made of a multilayer film having a steep absorption characteristic that absorbs light in the wavelength band between red is provided. The multilayer filter 28 is formed by laminating a large number of transparent films, and refracts transmitted light at the interface of each transparent film to absorb light in a predetermined wavelength band.

  In this embodiment, the multilayer filter 28 has an absorption peak in a wavelength band of 585 ± 20 nm.

  FIG. 5 is an absorption characteristic diagram of the multilayer filter 28. The multilayer filter 28 absorbs light in the wavelength band of 585 ± 20 nm with high absorptance and transmits light in other wavelength bands with high transmissivity. It has the characteristic to make it.

  The multilayer filter 28 is provided integrally on the emission surface (surface of the fluorescent layer 25) of the plurality of pseudo white light emitting elements 22, or the plurality of pseudo white light filters on the incident end surface 21a of the light guide plate 21. The light emitting elements 22 are attached to correspond to the arrangement positions of the light emitting elements 22, respectively. When the multilayer filter 28 is attached to the incident end face 21 a of the light guide plate 21, the multilayer filter 28 may be provided over the entire incident end face 21 a of the light guide plate 21.

  In the liquid crystal display device, a blue LED 24 and a fluorescent layer 25 in which a fluorescent material 27 emitting fluorescence of a color other than blue is dispersed in a surface light source 20 disposed on the opposite side of the liquid crystal display element 1 from the observation side. And having a wavelength band between green and red between the incident end face 21a of the light guide plate 21 of the surface light source 20 and the plurality of pseudo white light emitting elements 22. Since the multilayer filter 28 having steep absorption characteristics to absorb is disposed, an image with high color reproducibility can be displayed.

  In this embodiment, the pseudo white light emitting element 22 has a fluorescent layer 25 in which a yellow fluorescent material 27 emitting yellow fluorescence is dispersed, and the multilayer filter 28 has a wavelength band of 585 ± 20 nm. Since an image having an absorption peak is provided, an image with sufficiently high color reproducibility can be displayed.

  6 is a spectral distribution diagram of the emitted light from the pseudo white light emitting element 22, and FIG. 7 is a spectral distribution diagram of the light emitted from the pseudo white light emitting element 22 and further transmitted through the multilayer filter.

  As shown in FIG. 6, the light emitted from the pseudo white light emitting element 22 having the blue LED 24 and the fluorescent layer 25 in which the yellow fluorescent material 27 is dispersed has a steep luminance peak in the vicinity of 450 nm and in the vicinity of 530 to 580 nm. The light has a moderate luminance peak, and the color purity of green light and red light is low.

  On the other hand, the light emitted from the pseudo white light emitting element 22 and further transmitted through the multilayer filter 28 has a wavelength between green and red from the light having the spectral distribution shown in FIG. It is light that has absorbed light in a band (585 ± 20 nm), and this light has independent luminance peaks for each wavelength band near 450 nm, near 550 nm, and near 650 nm, as shown in FIG. Light with high color purity of each color of blue, green, and red, that is, light closer to white than the pseudo white light.

  In the liquid crystal display device of this embodiment, the multilayer filter 28 is disposed between the incident end face 21a of the light guide plate 21 of the surface light source 20 and the plurality of pseudo white light emitting elements 22, and the pseudo white light emitting element. 22 and further, light in the wavelength band (585 ± 20 nm) between green and red is absorbed by the multilayer filter 28, which is closer to white (the color purity of each color of blue, green, and red is high). Since the illumination light is guided by the light guide plate 21 of the surface light source 20 and irradiated to the liquid crystal display element 1, the three colors of red, green, and blue are emitted from each pixel 14 of the liquid crystal display element 1. The color purity of red, green, and blue light that is colored and emitted by the filters 8R, 8G, and 8B can be increased.

  FIG. 8 shows a comparative example of a liquid crystal display device that does not include the multilayer filter 28 (a liquid crystal display device that emits pseudo white light emitted from the pseudo white light emitting element 22 toward the liquid crystal display element 1 as it is). FIG. 9 is a spectral distribution diagram of emitted light from each pixel of red, and FIG. 9 is a spectral distribution diagram of emitted light from each pixel of blue, green, and red of the liquid crystal display device of the above embodiment, and includes the multilayer filter 28. The liquid crystal display device of the example has higher color purity of the emitted red, green, and blue light than the liquid crystal display device of the comparative example.

  10 is a CIE chromaticity diagram of light emitted from the liquid crystal display device of the comparative example and the liquid crystal display device of the above example. The y-coordinate value is close to the NTSC standard compared to the emitted light of the liquid crystal display device of the comparative example.

  Therefore, according to the liquid crystal display device of the above embodiment, an image with high color reproducibility can be displayed.

  In the above embodiment, the multilayer filter 28 is disposed between the incident end face 21 a of the light guide plate 21 of the surface light source 20 and the plurality of pseudo white light emitting elements 22. As long as it is in the optical path from the pseudo white light emitting element 22 to the observation side surface of the liquid crystal display element 1 (the outer surface of the observation side polarizing plate 13), it may be disposed at another location.

(Second Embodiment)
FIG. 11 is an enlarged cross-sectional view of a part of a liquid crystal display device according to a second embodiment of the present invention. In this embodiment, the multilayer is provided between the light guide plate 21 of the surface light source 20 and the liquid crystal display element 1. A membrane filter 28 is disposed.

  In this embodiment, a multilayer filter 28 is disposed on the light exit surface 20 a of the light guide plate 21, but the multilayer filter 28 is the polarizing plate 12 on the side opposite to the observation side of the liquid crystal display element 1. You may arrange | position on the outer surface of.

(Third embodiment)
FIG. 12 is an enlarged cross-sectional view of a part of a liquid crystal display device showing a third embodiment of the present invention. This embodiment shows either one of a pair of substrates 2 and 3 of the liquid crystal display element 1 and its outer surface. The multilayer filter 28 is disposed between the polarizing plate (between the observation side substrate 3 and the observation side polarizing plate 13 in the figure).

  As shown in FIG. 12, when the multilayer filter 28 is disposed between the observation side substrate 3 and the observation side polarizing plate 13 of the liquid crystal display element 1, the pseudo light emitted from the pseudo white light emitting element 22. White light is guided as it is by the light guide plate 20 and enters the liquid crystal display element 1, but light emitted from each pixel 14 of the liquid crystal display element 1 is wavelength band between green and red by the multilayer filter 28. Since the light of (585 ± 20 nm) is absorbed and becomes light with high color purity of each color of blue, green, and red, it is emitted to the observation side, so that an image with high color reproducibility can be displayed.

(Fourth embodiment)
FIG. 13 is an enlarged cross-sectional view of a part of a liquid crystal display device showing a fourth embodiment of the present invention. This embodiment is a phase difference plate for improving the contrast and field of view of the liquid crystal display element 1. In this embodiment, the retardation plate 15 is provided between the observation side substrate 3 and the observation side polarizing plate 13 of the liquid crystal display element 1, and the retardation plate 15 and the observation side are provided. The multilayer filter 28 is disposed between the polarizing plate 13 and the polarizing plate 13.

  In this embodiment, a retardation plate 15 is provided between the observation-side substrate 3 and the observation-side polarizing plate 13 of the liquid crystal display element 1, but on the opposite side of the liquid crystal display element 1 from the observation side. The retardation plate 15 is provided between the substrate 2 and the opposite polarizing plate 12 disposed on the outer surface thereof, and the multilayer filter 28 is disposed between the retardation plate 15 and the opposite polarizing plate 12. May be.

  Further, in this embodiment, the liquid crystal display element 1 is provided with one retardation plate 15. However, the number of retardation plates may be two, and in this case, the two retardation plates are overlapped. The multilayer filter 28 may be disposed between them.

(Fifth embodiment)
FIG. 14 is an enlarged sectional view of a part of a liquid crystal display device showing a fifth embodiment of the present invention. In this embodiment, the liquid crystal display element 1 is enclosed inside (between a pair of substrates 2 and 3). On the inner surface of the substrate 2 on the opposite side of the liquid crystal layer 4 to the observation side, for example, on the opposite side to the observation side, a predetermined region of the plurality of pixels 14 (a region that is substantially half of the pixel 14 in the drawing). A reflection display unit 14a that is provided correspondingly and reflects the light incident from the observation side and emits the light to the observation side; and transmits the light incident from the opposite side to the observation side and emits the light to the observation side A reflective / transmissive display element including a reflective film 16 for forming the transmissive display part 14b other than the reflective display part 14a for each of the plurality of pixels 14 is used, and the multilayer filter 28 is used as a simulation of the surface light source 20. From the white light emitting element 22 to the liquid crystal display element 1 One position of the light path of the serial to the reflective film 16 is for example those arranged on the exit surface 21b of the light guide plate 21 of the surface light source 20.

  In this embodiment, a transparent liquid crystal layer thickness adjusting film 17 is provided on the inner surface of the observation side substrate 3 of the liquid crystal display element 1 so as to correspond to the reflective display portion 14a of each pixel 14, and is incident from the observation side. The value of the product Δnd of the liquid crystal birefringence anisotropy Δn and the liquid crystal layer thickness d of the reflective display portion 14a that the transmitted light reciprocates through the liquid crystal layer 4 and is emitted to the observation side is expressed as the transmission display portion. It is set to substantially 1/2 of Δnd of 14b.

  In the liquid crystal display device of this embodiment, since the liquid crystal display element 1 is a reflective / transmissive display element, the reflective display using the external light (white light) that is the light of the usage environment of the liquid crystal display device, and the surface It is possible to perform transmissive display using irradiation light from the light source 20.

  In this embodiment, since the multilayer filter 28 is disposed in the optical path from the pseudo white light emitting element 22 to the reflective film 16 of the liquid crystal display element 1, the liquid crystal display element 1 has an observation side. The light that is incident on the reflective film 16 and is reflected by the reflective film 16 and exits to the observation side does not pass through the multilayer filter 28, and thus the color reproducibility of the reflective display that uses the external light is not degraded. The color reproducibility of the transmissive display using the irradiation light from the surface light source 20 can be improved.

(Other embodiments)
In each of the above-described embodiments, the steep light that absorbs light in the wavelength band between green and red at one place in the light path from the pseudo white light emitting element 22 to the surface on the observation side of the liquid crystal display element 1. Although the multilayer filter 28 having excellent absorption characteristics is arranged, a plurality of locations (2 locations or 3 locations) in the optical path from the pseudo white light emitting element 22 to the observation side surface of the liquid crystal display element 1 A multilayer filter having a steep absorption characteristic that absorbs light in the wavelength band between green and red may be disposed, and in that case, the total absorption characteristic of each multilayer filter disposed in the plurality of locations may be determined. The absorption characteristic of one multilayer filter 28 in the above embodiment may be substantially the same.

  In addition, the surface light source 20 of each of the above-described embodiments is configured to guide the light emitted from the pseudo white light emitting element 22 by the light guide plate 21 and irradiate the liquid crystal display element 1, but the light emitted from the pseudo white light emitting element 22. The light guiding means for irradiating the liquid crystal display element 1 toward the liquid crystal display element 1 may have another configuration.

  Furthermore, in each Example mentioned above, what has the fluorescent layer 25 which disperse | distributed the yellow fluorescent substance 27 as the pseudo white light emitting element 22 is provided, but a pseudo white light emitting element is a green fluorescent substance which emits green fluorescence, and Alternatively, a fluorescent layer in which a red fluorescent material emitting red fluorescence is dispersed may be used.

1 is a perspective view of a liquid crystal display device showing a first embodiment of the present invention. FIG. 3 is an enlarged sectional view of a part of the liquid crystal display device according to the first embodiment. The expanded side view by the side of the light emitting element arrangement | positioning of the surface light source in a 1st Example. The expanded sectional view of a pseudo white light emitting element. The absorption characteristic figure of a multilayer filter. The spectral distribution map of the emitted light of the pseudo white light emitting element which has blue LED and the fluorescent layer in which the yellow fluorescent material was disperse | distributed. The spectral distribution map of the light radiate | emitted from the pseudo white light emitting element, and also permeate | transmitted the multilayer filter. The spectral distribution figure of the emitted light of the liquid crystal display device of the comparative example which is not provided with a multilayer filter. The spectral distribution map of the emitted light of the liquid crystal display device of a 1st Example. The CIE chromaticity diagram of the emitted light of the liquid crystal display device of the comparative example and the liquid crystal display device of the first embodiment. FIG. 5 is an enlarged sectional view of a part of a liquid crystal display device showing a second embodiment of the present invention. FIG. 6 is an enlarged sectional view of a part of a liquid crystal display device showing a third embodiment of the present invention. FIG. 9 is an enlarged cross-sectional view of a part of a liquid crystal display device showing a fourth embodiment of the present invention. FIG. 10 is an enlarged sectional view of a part of a liquid crystal display device showing a fifth embodiment of the present invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display element, 2, 3 ... Substrate, 4 ... Liquid crystal layer, 5 ... Pixel electrode, 6 ... TFT, 7 ... Counter electrode, 8R, 8G, 8B ... Color filter, 12, 13 ... Polarizing plate, 14 ... Pixel , 14a ... reflection display unit, 14b ... transmission display unit, 15 ... phase difference plate, 16 ... reflection film, 17 ... liquid crystal layer thickness adjustment film, 20 ... surface light source, 21 ... light guide plate, 22 ... pseudo white light emitting element, 24 ... Blue LED, 25 ... Fluorescent layer, 26 ... Transparent material, 27 ... Fluorescent substance, 28 ... Multilayer filter.

Claims (4)

A liquid crystal display element in which a plurality of pixels for controlling light transmission are arranged in a matrix;
The blue light emitting diode, which is disposed on the opposite side of the liquid crystal display element from the observation side, includes a blue light emitting diode, and a fluorescent layer which is provided on the emission side of the blue light emitting diode and emits fluorescence of a color other than blue. A pseudo white light emitting element that emits pseudo white light composed of blue light emitted from the fluorescent layer and fluorescence of a color other than blue emitted from the fluorescent layer, and the liquid crystal display element is irradiated with light emitted from the pseudo white light emitting element. A surface light source to
It is arranged in at least one place in the light path from the pseudo-white light emitting element to the viewing side surface of the liquid crystal display element, and is composed of a multilayer film having steep absorption characteristics that absorbs light in the wavelength band between green and red. An absorption filter;
A liquid crystal display device comprising:   The liquid crystal display device according to claim 1, wherein the fluorescent layer of the pseudo-white light emitting element contains a yellow fluorescent material that emits yellow fluorescence.   The liquid crystal display device according to claim 1, wherein the absorption filter has an absorption peak in a wavelength band of 585 ± 20 nm.   The liquid crystal display element is provided on the opposite side to the observation side of the liquid crystal layer enclosed therein, corresponding to a predetermined region of a plurality of pixels, and reflects light incident from the observation side. A reflective display unit that emits light to the observation side and a transmissive display unit other than the reflective display unit that transmits light incident from the opposite side to the observation side and emits the light to the observation side are formed for each of the plurality of pixels. The reflection / transmission type display element having a reflection film for performing the above operation, wherein the absorption filter is arranged in an optical path from a pseudo white light emitting element to the reflection film of the liquid crystal display element. 2. A liquid crystal display device according to 1.

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