KR101751600B1 - Display device - Google Patents

Abstract

According to an embodiment of the present invention, the first substrate includes first to fourth pixel electrodes. The layer of the color filter includes a red filter opposed to the first pixel electrode, a green filter opposed to the second pixel electrode, and a second opaque layer opposed to the third pixel electrode and having a peak of transmittance at a wavelength shorter than 460 nm And a second blue filter opposed to the fourth pixel electrode and having a peak of transmittance on the longer wavelength side than the wavelength of 460 nm.

Description

Display device {DISPLAY DEVICE}

<Related application>

The present application claims priority based on Japanese Patent Application No. 2014-196702, filed on September 26, 2014, and Japanese Patent Application No. 2015-148348, filed on July 28, 2015, The entire contents of which are incorporated herein by reference.

Embodiments described herein relate to a display device.

In recent years, portable terminals have become popular. 2. Description of the Related Art A portable terminal includes a smart phone, a personal digital assistant (PDA), or a tablet computer, and its display function is also being enhanced. As a display device of a portable terminal, various display devices such as a liquid crystal display device, a display device using an LED, a display device using an organic EL, and a cold cathode ray tube have been developed. These display devices can display color images.

1 is an exploded perspective view schematically showing a configuration example of a liquid crystal display device LCD according to the present embodiment.
Fig. 2 is a cross-sectional view schematically showing a configuration example of the liquid crystal display device LCD shown in Fig. 1. Fig.
3 is a view schematically showing the configuration and equivalent circuit of the liquid crystal display panel PNL.
Fig. 4 is a diagram showing an example of arrangement of color filters arranged for each pixel PX in one embodiment. Fig.
Fig. 5 is a diagram showing in more detail an example of the configuration of the complex color unit pixel shown in Fig. 4 as a part of columns COL1 and COL2.
Fig. 6A is a drawing showing the square-surrounding portion 1 of Fig. 5, and showing the vicinities of the source wirings S2 and S3 and the gate wiring G2 enlarged. Fig.
6B is a schematic diagram showing a cross section of the device of FIG. 6A along a line AB; FIG.
7 schematically shows a cross-sectional structure around a connection portion including the switching element SW shown in Figs. 6A and 6B in one embodiment; Fig.
8 schematically shows a cross-sectional structure around a connection portion including the switching element SW shown in Figs. 6A and 6B in another embodiment; Fig.
Fig. 9 is a diagram showing an example of a color pixel array of a part of an embodiment; Fig.
FIG. 10 is a diagram showing an example of a color pixel array of a part of another embodiment; FIG.
Fig. 11 is a diagram showing an example of a color pixel array of a part of another embodiment; Fig.
Fig. 12 is a diagram showing an example of a color pixel array of a part of another embodiment; Fig.
13 is a diagram showing examples of intensity characteristics of light obtained from B1 pixel, B2 pixel, R pixel, and G pixel in the display device according to the embodiment;
14 is a chromaticity diagram for explaining an area in which a display device of the embodiment using the B1 pixel and the B2 pixel is used to represent a color;
Fig. 15 is a view showing still another embodiment, and is a diagram showing an example of light intensity characteristics obtained when a plurality of light emitting diodes LD having different characteristics are used as light sources. Fig.
16 is a diagram showing an example of the schematic internal configuration of the second driving circuit SD;
17 is a partial cross-sectional view of a display device according to still another embodiment.

Various embodiments of the present invention will be described with reference to the accompanying drawings.

In color display devices, it has recently been studied that light having a peak at a wavelength of about 460 nm has a bad influence on cells of the human eye. For example, it is known that when a retina receives light near a wavelength of 460 nm, melatonin (a hormone related to sleep) is suppressed, resulting in insomnia and the like. Light having a peak at a wavelength of about 460 nm is output from an LED light source used in a display device. For this reason, measures for suppressing light having a peak in the vicinity of a wavelength of 460 nm in a display device are desired.

The present embodiment aims to provide a display device capable of suppressing the output of light having a peak in the vicinity of a wavelength of 460 nm.

According to the present embodiment, the first substrate has first to fourth pixel electrodes. The second substrate includes a red filter opposed to the first pixel electrode, a green filter opposed to the second pixel electrode, a second opposed electrode facing the third pixel electrode and having a peak of transmittance at a wavelength shorter than 460 nm 1 blue filter, and a second blue filter opposing the fourth pixel electrode and having a peak of transmittance on the longer wavelength side than the wavelength of 460 nm.

Hereinafter, this embodiment will be described in detail. It is to be understood that the present disclosure is merely illustrative and that those skilled in the art are, of course, within the scope of the present invention as to what can be easily overcome by timely changes while maintaining the publicity of the invention. In addition, in order to make the explanation more clear, the drawings are schematically expressed with respect to the width, thickness, shape, and the like of each part as compared with the actual shape, but the interpretation of the present invention is not limited thereto. In addition, in the present specification and the drawings, the same reference numerals are given to constituent elements having the same or similar functions as those described above with respect to the drawings, and redundant detailed explanations may be omitted.

1 is an exploded perspective view schematically showing a configuration example of a liquid crystal display device LCD according to the present embodiment. The liquid crystal display device LCD includes an active matrix type liquid crystal display panel PNL, a double-sided tape TP, an optical sheet OS, a frame FR, a light guide plate LG, a light source unit LU, a reflection sheet RS and a bezel BZ. The surface light source device LS for illuminating the liquid crystal display panel PNL includes at least a light guide plate LG and a light source unit LU.

The liquid crystal display panel PNL includes a first substrate SUB1 having a flat plate shape, a second substrate SUB2 having a flat plate shape disposed opposite to the first substrate SUB1, and a liquid crystal layer held between the first substrate SUB1 and the second substrate SUB2 Respectively. Since the liquid crystal layer is very thin compared to the thickness of the liquid crystal display panel PNL and is located inside the sealing material joining the first substrate SUB1 and the second substrate SUB2, the illustration is omitted.

The liquid crystal display panel PNL has a display area DA for displaying an image in an area in which the first substrate SUB1 and the second substrate SUB2 face each other. In the illustrated example, the display area DA is formed in a rectangular shape and may be referred to as an active area. The liquid crystal display panel PNL is a transmissive type having a transmissive display function for selectively transmitting light from the surface light source device LS to display an image. The liquid crystal display panel PNL may have a configuration corresponding to a transverse electric field mode using a transversal electric field that is substantially parallel to the main surface of the substrate as a display mode, and may be configured to correspond to a conventional electric field mode using a current- Configuration.

In the illustrated example, the driving IC chip CP and the flexible printed circuit board FPC are mounted on the first substrate SUB1 as a signal supply source for supplying a signal necessary for driving the liquid crystal display panel PNL.

The optical sheet OS has light transmittance and is located on the back side of the liquid crystal display panel PNL and faces at least the display area DA. The optical sheet OS includes a diffusion sheet OSA, a prism sheet OSB, a prism sheet OSC, a diffusion sheet OSD, and the like. In the illustrated example, these optical sheets OS are all formed in a rectangular shape.

The frame FR is located between the liquid crystal display panel PNL and the bezel BZ. In the illustrated example, the frame FR is formed in a rectangular frame shape, and has a rectangular opening OP opposed to the display area DA.

The double-sided tape TP is located between the liquid crystal display panel PNL and the frame FR outside the display area DA. The double-sided tape TP has, for example, light shielding property and is formed in a rectangular frame shape.

The light guide plate LG is located between the frame FR and the bezel BZ. The light guide plate LG is formed in a flat plate shape and has a first major surface LGA, a second major surface LGB on the opposite side to the first major surface LGA, and a side surface LGC connecting the first major surface LGA and the second major surface LGB.

The light source unit LU is arranged along the side LGC of the light guide plate LG. The light source unit LU includes a plurality of light emitting diodes LD functioning as a light source, a flexible circuit board LFPC on which a plurality of light emitting diodes LD are mounted, and the like. In the illustrated example, the light emitting diodes LD are arranged in a line along a side LGC parallel to the short side of the light guide plate LG. Further, the light emitting diodes LD may be arranged along the other side (the side crossing the side LGC) parallel to the long side of the light guide plate LG.

The reflective sheet RS has light reflectivity and is located between the bezel BZ and the light guide plate LG. In the illustrated example, the reflection sheet RS is formed in a rectangular shape.

The bezel BZ accommodates the liquid crystal display panel PNL, the double-sided tape TP, the optical sheet OS, the frame FR, the light guide plate LG, the light source unit LU, and the reflection sheet RS described above. In the illustrated example, the surface light source device LS is arranged on the back side of the liquid crystal display panel PNL, that is, on the side facing the first substrate SUB1, and functions as a so-called backlight.

2 is a cross-sectional view schematically showing a configuration example of the liquid crystal display device LCD shown in Fig. The liquid crystal display panel PNL, various optical sheets OSA to OSD, the light guide plate LG, and the reflective sheet RS extend not only in the display area DA but also in the non-display area NDA outside the display area DA. The light source unit LU and the frame FR are located in the non-display area NDA.

The reflective sheet RS is opposed to the second major surface LGB of the light guide plate LG. Each of the various optical sheets OSA to OSD is laminated between the first major surface LGA of the light guide plate LG and the liquid crystal display panel PNL.

In the light source unit LU, the flexible circuit board LFPC is located between the bezel BZ, the light guide plate LG, and the frame FR. The flexible circuit board LFPC is adhered to the second main surface LGB of the light guide plate LG by, for example, double-sided tape or the like. The light emitting diode LD is housed in a space between the frame FR and the bezel BZ. The light emitting surface LE of the light emitting diode LD is opposed to the side LGC of the light guide plate LG. The side LGC corresponds to the incident surface on which the radiation from the light emitting diode LD is incident. The first main surface LGA intersecting the side LGC corresponds to an emission surface for emitting light incident from the side LGC. The liquid crystal display panel PNL is located on the side facing the first main surface LGA.

The double-sided tape TP adheres the liquid crystal display panel PNL and the frame FR in the non-display area NDA. The liquid crystal display panel PNL has a first optical element OD1 bonded to the outer surface of the first substrate SUB1 and a second optical element OD2 bonded to the outer surface of the second substrate SUB2. Each of the first optical element OD1 and the second optical element OD2 includes at least a polarizing plate. The first optical element OD1 is opposed to the optical sheet (diffusion sheet) ODA.

The second substrate SUB2 includes a color filter, the detailed structure of which will be described later.

3 is a view schematically showing a configuration of the liquid crystal display panel PNL and an example of an equivalent circuit. The display device is provided with an active matrix type liquid crystal display panel PNL. The liquid crystal display panel LPN includes a first substrate SUB1, a second substrate SUB2 disposed opposite to the first substrate SUB1, and a liquid crystal layer LQ held between the first substrate SUB1 and the second substrate SUB2. The display area DA corresponds to a region where the liquid crystal layer LQ is held between the first substrate SUB1 and the second substrate SUB2, and includes, for example, a plurality of pixels PX arranged in a matrix and in a rectangular shape.

The first substrate SUB1 includes a plurality of gate wirings G (G1 to Gn) extending along the first direction X, a plurality of source wirings G1 to Gn extending along the second direction Y crossing the first direction X, S (S1 to Sm).

Each pixel PX has a switching element SW electrically connected to the gate wiring G and the source wiring S as shown on the right side of FIG. 3 (a region surrounded by a one-dot chain line), and a switching element SW A pixel electrode PE electrically connected to the pixel electrode PE, and a common electrode CE1 facing the pixel electrode PE. Although two common electrodes CE1 are shown, they are actually integrated electrodes. The storage capacitor CS is formed, for example, between the common electrode CE1 and the pixel electrode PE. The second substrate SUB2 faces the first substrate SUB1 via the liquid crystal layer LQ. Further, the storage capacitor CS may be provided as required or not provided. For example, when the liquid crystal display device LCD is in the FFS (Fringe Field Switching) mode, since the pixel electrode PE, the common electrode CE1, and the insulating material disposed therebetween function as the storage capacitor CS, You do not need to install it.

Each of the gate lines G (G1 to Gn) is drawn outside the display area DA and connected to the first driving circuit GD. Each of the source wirings S (S1 to Sm) is drawn outside the display area DA and connected to the second driving circuit SD. The first driving circuit GD and the second driving circuit SD are formed, for example, at least partially on the first substrate SUB1, and are connected to a driving IC chip (also referred to as a liquid crystal driver) CP.

In order to realize the column inversion driving method, the second driving circuit SD can output pixel signals of different polarities when outputting pixel signals to the source wirings of adjacent columns. The driving IC chip CP incorporates a controller for controlling the first driving circuit GD and the second driving circuit SD and functions as a signal supply source for supplying signals necessary for driving the liquid crystal display panel LPN. In the illustrated example, the driving IC chip CP is mounted on the first substrate SUB1 outside the display area DA of the liquid crystal display panel LPN.

The common electrode CE1 extends all over the display area DA and is formed in common to the plurality of pixels PX. The common electrode CE1 is drawn out to the outside of the display area DA and connected to the power feeding portion Vcom. The feeding portion Vcom is formed on the first substrate SUB1 outside the display area DA, for example, and is electrically connected to the common electrode CE1. A constant common voltage is supplied to the feed portion Vcom.

In the plurality of pixels PX, color filters are arranged in a predetermined rule. The color filter is formed on the second substrate SUB2, facing the pixel electrode with the liquid crystal layer LQ therebetween.

FIG. 4 shows an example of a color filter arranged for each pixel PX. Hereinafter, a pixel in which the color filter is integrated is referred to as a color pixel, and a pixel in which filters of red (R), green (G), and blue (B1 or B2) are integrated is referred to as a red (R) pixel, And blue (B1 or B2) pixels, respectively. Therefore, R, G, B1, and B2 correspond to the red filter, the green filter, the first blue filter, and the second blue filter, respectively. In Fig. 4, a part of the source wirings S (S1 to Sm) and the like are omitted for easy understanding of the arrangement of the color filters.

In this embodiment, the first column C11 by the R pixels, the second column C12 by the G pixels, and the RGB composite color unit pixels by the third column C13a or C13b in which the B1 pixel and the B2 pixel alternate exist. The composite color unit pixel includes RGB pixels.

Here, the third column is denoted by C13a and C13b. The third column C13a is a column in which the first blue (B1) pixel and the second blue (B2) pixel alternate (the odd row is the B1 pixel and the even row is the B2 Pixels), the third column C13b is a column in which the second blue (B2) pixel and the first blue (B1) pixel alternate (the odd row is the B2 pixel and the even row is the B1 pixel). The B1 pixel and the B2 pixel can also be arranged such that the B1 pixel and the B2 pixel are repeatedly arranged alternately when viewed in the row direction. In FIG. 4, the columns COL1, COL2, COL3, COL4,... . The columns COL1, COL2, COL3, COL4, ... of each complex color unit pixel Includes a first column C11, a second column C12, and a third column C13a (or C13b), respectively. Then, gate wirings G (G1, G2, G3, G4, ..., Gn) are wired in the row direction corresponding to each row of pixels.

The first blue (B1) filter used for the B1 pixel has a peak of transmittance on the shorter wavelength side than the wavelength of 460 nm. The second blue (B2) filter used for the B2 pixel has a peak of transmittance on the longer wavelength side than the wavelength of 460 nm. The first blue (B1) pixel and the second blue (B2) pixel play an important role in this display apparatus. By using the first blue (B1) pixel and the second blue (B2) pixel, it is possible to provide a display device capable of suppressing the output of light having a peak in the vicinity of a wavelength of 460 nm. This is due to the use of a first blue (B1) filter having a transmittance peak at a shorter wavelength side than a wavelength of 460 nm and a second blue (B2) filter having a transmittance peak at a wavelength longer than 460 nm. Functions and effects of the first blue (B1) pixel and the second blue (B2) pixel will be described later in detail.

In the present specification, the first blue color and the second blue color are wavelengths having a peak on the shorter wavelength side than the wavelength 460 nm among the wavelengths in the range of blue that can be recognized as blue by human eyes, 2 Blue is a wavelength having a peak at a longer wavelength side than a wavelength of 460 nm. More specifically, the first blue color is a wavelength of 435 to 495 nm, the wavelength of the peak is smaller than 460 nm, and the second blue color is a wavelength of 435 to 495 nm, the wavelength of which is larger than 460 nm.

In Fig. 4, the + or - sign is attached to each color pixel, but this sign indicates the polarity of the pixel signal written in each color pixel. Each column has +, -, +, -, ... Is reversed and is called a column inversion driving system. The column inversion driving method is a liquid crystal driving method in which the polarities of driving voltages of adjacent pixel columns are driven with different polarities and the polarity is reversed for each frame in order to improve liquid crystal driving efficiency.

With this driving method, the following effects can be obtained. Now, attention will be paid to the writing process of the pixel signal for the red pixel R, for example. For example, when the gate wiring G1 is on and viewed in the row direction, the columns COL1, COL3, COL5, ... (Minus potential) is written in the red pixel R of the row COL2, COL4, COL6, ... The pixel signal (positive potential) is written to the red pixel R in FIG. The R pixel has a polarity of +, -, +, -, ... As shown in Fig. Therefore, the polarity balance of the common electrode with respect to red is not biased by either one of the polarities. That is, in the writing process of the red pixel signal, the potential of the common electrode is not biased in the plus or minus direction. The same effect can be obtained in the writing process of the pixel signal to the green G pixel and the writing process of the pixel signal to the B1 pixel and the B2 pixel.

5 is a diagram showing a more detailed example of the configuration of the complex color unit pixel shown in Fig. 4 on the part of columns COL1 and COL2. In Fig. 5, the structure of the pixel electrode PE and the source wirings S1 to S4 are further shown in comparison with Fig. 5 schematically shows the periphery of the connection of the pixel electrode PE and the source wiring S (S1 to S4) and the gate wiring G (G1 to G3) corresponding to the pixel electrode PE. Openings are formed in regions partitioned by the source wirings S (S1 to S4) and the gate wirings G (G1 to G3). In each opening, pixel electrodes PE are arranged.

The pixel electrode PE is connected to the source wiring S by the switching element SW formed in the connecting portion. The switching element SW is controlled to be turned on or off by a control signal from the gate wiring G. The configuration of this connecting portion will be described later with reference to Figs. 6A and 6B.

Figs. 6A and 6B show the rectangular portion 1 of Fig. 5 taken out. In Fig. 6A, the vicinities of the source wirings S2, S3 and the gate wirings G2 are shown enlarged. Fig. 6B shows a schematic configuration of a section of the device of Fig. 6A taken along the line A-B. 6A and 6B, the area of the second blue (B2) pixel connected to the gate wiring G2 will be described in detail.

In the present embodiment, the pixel electrode PE has a slit and employs a FFS (Fringe Field Switching) method as a method of driving the liquid crystal molecules between the pixel electrode PE and the common electrode CE1.

The source wiring S 3 is located between the insulating film 12 and the insulating film 13. A semiconductor layer SC is formed under the source wiring S3 with the insulating films 12 and 11 interposed therebetween. The source electrode WS connected to a part of the source wiring S3 is connected to the source portion of the semiconductor layer SC through the contact hole CH1. The semiconductor layer SC extends along the lower portion of the source wiring S3, passes through the lower portion of the gate wiring G2, and enters the region of the second blue pixel B2. The semiconductor layer SC drawn into the region of the second blue pixel B2 is used as a drain portion.

The gate wiring G2 is located between the lower insulating film 11 of the layer of the source wiring S3 and the insulating film 12. A part of the gate wiring G2 protrudes to the pixel formation region. And a part thereof is shown as G2 '.

The drain portion of the semiconductor layer SC is connected to the drain electrode WD through the contact hole CH2 passing through the insulating films 11 and 12. [ The drain electrode WD is connected to the pixel electrode PE through the insulating film 13, the common electrode CE1, and the contact hole CH3 passing through the insulating film 14. [ The common electrode CE1 of FIG. 6B is not shown in FIG. 6A.

Fig. 7 is a view schematically showing a cross-sectional structure around a connection portion including the switching element SW shown in Figs. 6A and 6B.

The first substrate SUB1 is formed using a first insulating substrate 10 having optical transparency such as a glass substrate or a resin substrate. The first substrate SUB1 includes a switching element SW, a first common electrode CE1, a pixel electrode PE, a first insulating film 11, a second insulating film 12, a third insulating film 13, a fourth insulating film 14, A horizontal alignment film AL1, and the like.

In the illustrated example, the switching element SW is a top gate type thin film transistor. The switching element SW is provided with a semiconductor layer SC disposed on the first insulating substrate 10. An undercoat layer, which is an insulating film, may be interposed between the first insulating substrate 10 and the semiconductor layer SC.

The semiconductor layer SC is covered with a first insulating film 11. The first insulating film 11 is also disposed on the first insulating substrate 10. The first insulating film 11 is formed of an inorganic material such as, for example, silicon oxide or nitrogen oxide.

The gate electrode WG of the switching element SW is formed on the first insulating film 11 and is located directly above the semiconductor layer SC. The gate electrode WG is electrically connected to the gate lines G2 and G2 '(or formed integrally with the gate line), and is covered with the second insulating film 12. [ The second insulating film 12 is also disposed on the first insulating film 11. The second insulating film 12 is formed of an inorganic material such as silicon nitride.

The source electrode WS and the drain electrode WD of the switching element SW are formed on the second insulating film 12. The source wiring S3 is also formed on the second insulating film 12 in the same manner. The illustrated source electrode WS is electrically connected to the source wiring S3 (or formed integrally with the source wiring S3). The source electrode WS and the drain electrode WD are in contact with the semiconductor layer SC through the contact holes CH1 and CH2 penetrating the first insulating film 11 and the second insulating film 12, respectively. The switching element SW is covered with the third insulating film 13 together with the source wiring S3. The third insulating film 13 is also disposed on the second insulating film 12. The third insulating film 13 is formed of, for example, a transparent resin material.

The common electrode CE1 extends over the third insulating film 13. [ As shown in the drawing, the common electrode CE1 covers the upper portion of the source wiring S3 and extends toward the adjacent pixel. The common electrode CE1 is formed of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO). On the common electrode CE1, a fourth insulating film 14 is disposed.

The third insulating film 13 and the fourth insulating film 14 are provided with a contact hole CH3 penetrating to the drain electrode WD. The fourth insulating film 14 is formed to have a thin film thickness as compared with the third insulating film 13, and is formed of an inorganic material such as silicon nitride. This fourth insulating film 14 corresponds to an interlayer insulating film covering the common electrode CE1.

The pixel electrode PE is formed with a slit above the fourth insulating film 14 and faces the first common electrode CE1. The pixel electrode PE is electrically connected to the drain electrode WD of the switching element SW through the contact hole CH3. The pixel electrode PE is formed of a transparent conductive material such as ITO or IZO. The pixel electrode PE is covered with the first horizontal alignment film AL1.

On the other hand, the second substrate SUB2 is formed using a second insulating substrate 30 having optical transparency such as a glass substrate or a resin substrate. The second substrate SUB2 is provided with a light shielding layer 31, a color filter 32, an overcoat layer 33, a second horizontal alignment film AL2, and the like on the side opposite to the first substrate SUB1 of the second insulating substrate 30 .

The light shielding layer 31 divides each pixel PX in the display area DA and forms an opening. The light shielding layer 31 is formed at a boundary of color pixels or at a position opposite to the source wiring provided on the first substrate SUB1. The light-shielding layer 31 is formed of a light-shielding metal material or a black resin material.

The color filter 32 is formed in an opening formed in a region partitioned by a gate wiring and a source wiring, and a part of the color filter 32 overlaps with the light shielding layer 31. For example, in the case of this figure, the color filter 32 is a filter for B2 pixels, and a resin material colored with a second blue color is used. In the case of a red filter, a resin material colored with red is used. In the case of a green filter, a resin material colored with green is used. In the case of the first blue filter, a resin material colored with a first blue color is used.

The red filter is arranged in R pixels for displaying red, the green filter is arranged in G pixels for displaying green, and the first and second blue filters are arranged in B1 and B2 pixels for displaying blue. The boundary between the color filters of different colors overlaps the light shielding layer above the source wiring.

The overcoat layer (33) covers the color filter (32). The overcoat layer 33 flattens the irregularities of the light shielding layer 31 and the color filter 32. The overcoat layer 33 is formed of a transparent resin material. The overcoat layer 33 is used as a base and is covered with the second horizontal alignment film AL2.

The first horizontal alignment film AL1 and the second horizontal alignment film AL2 are formed of a material exhibiting horizontal alignment properties and have an alignment regulating force for aligning the liquid crystal molecules in the normal direction of the substrate without the need for alignment treatment such as rubbing.

The first horizontal alignment film AL1 and the second horizontal alignment film AL2 are disposed so as to oppose each other on the first substrate SUB1 and the second substrate SUB2 as described above. At this time, a predetermined cell gap is formed between the first substrate SUB1 and the second substrate SUB2 by the columnar spacers formed on one of the substrates. The first substrate SUB1 and the second substrate SUB2 are bonded by a sealing material in a state where cell gaps are formed. The liquid crystal layer LQ is sealed in the cell gap between the first horizontal alignment film AL1 and the second horizontal alignment film AL2.

A backlight BL is disposed on the back side of the liquid crystal display panel having the above-described structure. As the backlight BL, various forms are applicable, but a detailed description of the structure is omitted here.

On the outer surface of the first insulating substrate 10, a first optical element including the first polarizing plate PL1 is disposed. On the outer surface of the second insulating substrate 30, a second optical element including the second polarizing plate PL2 is disposed. The first polarizing plate PL1 and the second polarizing plate PL2 are arranged, for example, so that the respective polarizing axes are in a positional relationship of crossed Nicols perpendicular to each other.

7, the switching element SW, the pixel electrode PE, the common electrode CE1, and the like are disposed on the first substrate SUB1, and the layer of the color filter 32 is disposed on the second substrate SUB2 facing the first substrate SUB1 . That is, in Fig. 7, an example is shown in which the layers of the color filters 32 are disposed on the side of the counter substrate facing the array substrate.

However, in the display device of the present embodiment, the structure is not limited to the structure in which the layers of the color filters are disposed on the side of the opposing substrate, but may be a structure arranged on the array substrate side, that is, a so-called color filter-on-array (COA) structure.

8 shows an example in which the liquid crystal display device according to the present embodiment is manufactured by a COA structure. 8 shows an example in which a layer of the color filter 32 is formed between the second insulating film 12 and the third insulating film 13 in Fig.

In Fig. 8, the layer of the color filter 32 is formed so as to cover the source wiring S, the gate wiring G, the switching element SW, and the like. A part of the color filter 32 layer formed in each pixel is formed on the black matrix 31. The black matrix 31 is basically formed so as to cover the portions of the source wiring S, the gate wiring G and the switching element SW.

A red (R) filter, a green (G) filter, a first blue (B1) filter, and a second blue (B2) filter are formed as the layers of the color filters 32 in each pixel.

In the first substrate SUB1 as the array substrate, the irregularities caused by the arrangement of the switching element SW, the gate wiring G, the source wiring S, the black matrix, and the color filter layer are planarized by the third insulating film 13. [ This makes it unnecessary to provide an overcoat layer for planarizing the counter substrate side as compared with a configuration in which a black matrix or a color filter layer is disposed on the counter substrate side, thereby making it possible to reduce thickness, weight, and cost.

Fig. 9 shows a main part of an embodiment taken out. In the display device of the embodiment, the first substrate SUB1 includes first to fourth pixel electrodes. The first pixel electrode is, for example, a pixel electrode of R pixel, the second pixel electrode is a pixel electrode of G pixel, the third pixel electrode is a pixel electrode of B1 pixel, and the fourth pixel electrode is pixel electrode of B2 pixel to be. In Fig. 9, PE is shown as a representative of the pixel electrode, but the codes of the first to fourth pixel electrodes may be referred to as PE1 to PE4.

Therefore, the red (R) filter, the green (G) filter, the first blue (B1) filter and the second blue (B2) filter formed on the second substrate SUB2 respectively correspond to the first, And faces the fourth pixel electrode PE. The first blue (B1) filter is opposed to the third pixel electrode and has a peak of transmittance on the shorter wavelength side than the wavelength of 460 nm. The second blue (B2) filter is opposed to the fourth pixel electrode and has a peak of transmittance on the longer wavelength side than the wavelength of 460 nm. For example, the first blue (B1) filter has a transmittance peak at a wavelength of 430 nm, and the second blue (B2) filter has a transmittance peak at a wavelength of 470 nm. With this configuration, a display device capable of suppressing the output of light having a peak in the vicinity of a wavelength of 460 nm could be realized. In this display device, a pixel including an RGB filter is referred to as a complex color pixel. In this embodiment, the color balance is obtained by two complex color pixels 2R, 2G, B1, and B2.

In the embodiment of Fig. 9, the areas of the red (R) filter, the green (G) filter, the first blue (B1) filter and the second blue (B2) filter are the same. However, this embodiment is only an example, and a display device for suppressing the output of light having a peak in the vicinity of a wavelength of 460 nm, even in the configuration shown in Fig. 10, could be realized. In Fig. 9, the first substrate SUB1 and the second substrate SUB2 are superimposed on each other in a plan view. In the following, the area of the pixel is equal to the area of the color filter, respectively.

In the embodiment of FIG. 10, the R pixel and the G pixel are alternately arranged in the first column, and the first blue (B1) pixel and the second blue (B2) pixel are alternately arranged in the second column . Further, the first blue (B1) pixel and the second blue (B2) pixel are alternately arranged even when viewed in the row direction. The areas of the R pixel and the G pixel are the same as the areas of the first blue (B1) pixel (or the second blue (B2) pixel) For example, 1/2. A pixel including an RGB filter is referred to as a complex color pixel. In this embodiment, a color balance is obtained by two complex color pixels 2R, 2G, B1, and B2. Also in FIG. 10, the first substrate SUB1 and the second substrate SUB2 are superimposed on each other in a plan view.

Fig. 11 shows another embodiment. In this embodiment, the first column is an R pixel and the second column is a G pixel. In the third column, the first blue (B1) pixel and the second blue (B2) pixel are alternately arranged, but the area of the pixel B1 is large and the area of the pixel B2 is small. For example, the area of the R pixel is equal to the area of the G pixel, the area of the B1 pixel is larger than the area of the B2 pixel, the area of the B1 pixel is larger than the area of each of the R pixel and the G pixel, And G pixels, respectively. More specifically, the area of the B1 pixel is 1.5 times as large as the R pixel or G pixel, and the area of the B2 pixel is 0.5 times as large as the R pixel or G pixel. By controlling the area ratio of the B1 pixel and the B2 pixel, the light transmission amount can be controlled. In this embodiment, the B1 pixel and the B2 pixel are alternately arranged even when viewed in the row direction. Also in Fig. 11, the first substrate SUB1 and the second substrate SUB2 are superimposed on each other in a plan view.

Figure 12 also shows another embodiment. In this embodiment, the R pixel and the G pixel are alternately arranged in the first column, and the first blue (B1) pixel and the second blue (B2) pixel are alternately arranged in the second column. Further, the first blue (B1) pixel and the second blue (B2) pixel are alternately arranged even when viewed in the row direction. For example, the areas of the R pixel and the G pixel are the same, the area of the B1 pixel is larger than the area of the B2 pixel, the area of the B1 pixel is larger than the total area of the R pixel and the G pixel, And the area of the G pixel. More specifically, the area of the B1 pixel is 2/3 of the total area of two R pixels and two G pixels. The area of the B2 pixel is 1/3 of the total area of the area for two R pixels and the area for two G pixels. In other words, as for the area, the ratio of the B1 pixel to the B2 pixel is 2: 1. An area equal to the total area of the areas of the pixels B1 and B2 is acquired in the next column. The acquired area is divided into four areas. Two G pixels and two R pixels are allocated to the four pixels. When the total area of the B1 pixel and the B2 pixel is 3, the area of the B1 pixel is 2/3 of the total area, and the area of the B2 pixel is 1/3 of the total area. The area of each of the R pixel and G pixel is set to 3/4 = 0.75 of the B2 pixel area. In this embodiment, the color balance is obtained by the two complex color pixels 4R, 4G, 2B1 and 2B2. 12, the first substrate SUB1 and the second substrate SUB2 are superimposed on each other in plan view.

13 shows intensity characteristics of light obtained from B1 pixel, B2 pixel, R pixel, and G pixel in the display device of the present embodiment. A curve marked with a black circle mark and a curve marked with a black square mark indicate the intensity of light output from the B1 pixel and the B2 pixel, respectively. A curve in which white square marks are shown and a curve in which white circles are marked are characteristics showing the intensity of light output from R pixels and G pixels, respectively. The curve indicated by the dotted line is a characteristic indicating the intensity of light output from the light emitting diode LD and is shown for the sake of reference.

As can be seen from this characteristic graph, the display device according to the present embodiment can suppress the output of light having a peak in the vicinity of a wavelength of 460 nm. In this embodiment, for example, a blue (B1) pixel having a peak in an output light having a wavelength of 430 nm and a blue (B2) pixel having a peak in an output light having a wavelength of 470 nm are used. However, It is not. The original purpose can be achieved by using only blue pixels having a peak on the shorter wavelength side than the wavelength of 460 nm. In addition, even if only blue pixels having a peak on the longer wavelength side than the wavelength of 460 nm are used, the original purpose can be achieved. When two blue pixels having a peak on the shorter wavelength side than the wavelength 460 nm and a peak on the longer wavelength side than the wavelength 460 nm are used, the output of light having a peak near the wavelength 460 nm can be more effectively suppressed.

14 is a chromaticity diagram for explaining an area in which a display device of the embodiment using the B1 pixel and the B2 pixel is used for color representation. Basically, various colors are represented by the three primary colors of R, G, and B1. Since the display device of the present embodiment uses the B2 pixel in addition to the B1 pixel in the blue representation, it is a blue representation based on the color Bj on the line connecting the two pixels. Therefore, a color expression area enlarged beyond the color expression area expressed by the three primary colors of R, G, and B1 can be obtained. According to this display apparatus, the output of light having a peak in the vicinity of a wavelength of 460 nm can be suppressed.

15 is a view showing still another embodiment. This embodiment is an example of light intensity characteristics obtained when a plurality of light emitting diodes LD having different characteristics are combined as a light source. This embodiment can suppress the output of light having a peak in the vicinity of a wavelength of 460 nm by combining a plurality of light emitting diodes LD having different characteristics. In this embodiment, as the light emitting diode LD, a light emitting diode having a peak in the output light having a wavelength of 430 nm and a light emitting diode having a peak in the output light having a wavelength of 470 nm are incorporated in the light source unit LU shown in Fig. When this light source unit LU is used, the characteristic of the output light of the curve shown by the solid line in Fig. 15 is obtained. 15 is a graph showing the characteristics of the output light of the light emitting diode having a peak in the output light having a wavelength of 430 nm (curve shown by the dotted line) and the characteristics of the output light of the light emitting diode having the peak in the output light having a wavelength of 450 nm Curve).

In the embodiment, a first white light source having a peak of the emission spectrum on the shorter wavelength side than the wavelength of 460 nm as opposed to the incident surface of the light guide plate LG shown in Fig. 1, and a second white light source emitting light on the longer wavelength side The output of light having a peak in the vicinity of the wavelength of 460 nm can be suppressed by using at least the second white light source having the peak of the spectrum. The first white light source and the second white light source can be realized by a blue light emitting diode and a yellow phosphor.

Even when the characteristics of a plurality of light emitting diodes LD functioning as a light source are selected as described above, the output of light having a peak near a wavelength of 460 nm can be suppressed. In this case, as the color filter, the object can be achieved even if a conventional RGB filter is used. However, by combining the embodiment using the above-described B1 pixel and B2 pixel and the embodiment for selecting the characteristics of a plurality of light-emitting diode LDs, a display device that achieves the object more effectively can be obtained.

As the light sources (the first white light source and the second white light source), quantum dots may be used instead of light emitting diodes. The quantum dots can form arbitrary peaks from the long wavelength to the short wavelength region. In addition, as a light source (also referred to as an organic light-emitting diode (OLED)) using an organic electroluminescent (organic EL) material instead of a light emitting diode as the light source (the first white light source and the second white light source) May be used.

In the above example, two kinds of light sources, that is, a light emitting diode having a peak in the output light having a wavelength of 430 nm and a light emitting diode having a peak in the output light having a wavelength of 470 nm are used, May be combined with each other. For example, four wavelengths of wavelengths of 410 nm, 430 nm, 450 nm, and 470 nm may be used. The wavelength interval does not have to be equally spaced, but the energy intensity near the wavelength of 460 nm can be effectively suppressed by using the light source having the peak on the short wavelength side and the long wavelength side with the wavelength of 460 nm as the center. It is also possible to adopt a configuration in which this configuration is combined with the B1 pixel and B2 pixel described in the previous embodiments. With this configuration, it is possible to effectively suppress the energy intensity in the vicinity of the wavelength of 460 nm.

The present invention is not limited to the above-described embodiment. When the B1 pixel and the B2 pixel in the form of Figs. 9, 10, 11, and 12 are used, the blue signal is obtained by applying the conventional blue pixel signal to the B1 pixel and the B2 pixel, There is a case in which the color reproduction is not obtained. Therefore, it is preferable that a pixel signal suitable for the pixel arrangement pattern of Figs. 9 to 12 is generated.

16 is a diagram showing a schematic configuration of the inside of the second driving circuit SD. In the second driving circuit SD, a plurality of circuits are provided for performing digital / analog conversion on pixel data to be supplied to each pixel, amplifying analog pixel signals, and outputting them to the source wiring. The second driving circuit SD has an input interface 211. In the input interface 211, image data from the driving IC chip CP and a synchronizing signal Sync are inputted. The image data from the input interface 211 is latched by the image data latch circuit 213 for one horizontal line or a plurality of horizontal lines.

The image data corresponding to each of the source wirings S (S1 to Sm; in the example of Fig. 16, the source wirings S1 to S4 is represented as a representative) is corrected by the correction circuits 2141 to 2144, Are input to the digital-to-analog converters DA1 to DA4, and are generated as analog signals (pixel signals). The correction values corrected by the correction circuits 2141 to 2144 are set to values suitable for the pixel arrangement patterns in Figs. Further, the correction value can be switched to an odd-numbered line and an even-numbered line. In the actual circuit, although there is a gamma correction circuit, it is omitted.

The output pixel signals of the digital-to-analog converters DA1 to DA4 are generated as a plus pixel signal and a minus pixel signal, respectively. For example, in the case of the digital-to-analog converter DA1, the positive-polarity pixel signal is directly input to one terminal of the switch SL1, while the negative-polarity pixel signal is generated by the inverting circuit IN1 and input to the other terminal of the switch SL1 . One of the positive and negative electrode pixel signals of the digital-to-analog converter DA1 is selected on the switch SL1 and outputted to the source wiring S1. Likewise, the positive and negative electrode pixel signals of the digital-to-analog converter DA2 are selected on the switch SL2 and output to the source wiring S2. Also, the positive and negative electrode pixel signals of the digital-to-analog converter DA3 are selected on the switch SL3 and output to the source wiring S3. One of the positive and negative electrode pixel signals of the digital-to-analog converter DA4 is selected by the switch SL4 and output to the source wiring S4. The column polarity inversion is realized by the selection mode of the switches SL1 to SL4.

A sequencer (also referred to as a timing control circuit) 230 is synchronized with a synchronization signal from the outside. The sequencer 230 generates various timing signals based on the internal clock generated by the oscillator 231. [

The sequencer 230 has a timing signal for the input interface 211 to introduce image data from the outside, a timing signal for the image data memory 212 to introduce the image data from the input interface 211, The circuit 213 generates a timing signal for introducing the image data from the image data memory 212. [

The sequencer 230 also receives a timing signal for correcting the image data respectively by the correction circuits 2141 to 2144, a clock and timing signal for converting the image data to analog data by the digital-to-analog converters DA1 to DA4, SL4 are operated.

In addition, the sequencer 230 may include a central processing unit (CPU) 230a and a memory (not shown). The timing processing operation and the data processing operation based on the CPU 230a may be changed in accordance with software written in the memory. Thus, for example, the correction values used in the correction circuits 2141 to 2144 can be adjusted in accordance with the type of the filter (pixel array pattern). The correction circuits 2141 to 2144 including the adjustment means may be referred to as a gain control circuit or adjustment circuit of the pixel signal.

The panel control signal generating circuit 232 generates a timing pulse for controlling the display operation of the liquid crystal display panel PNL based on a predetermined timing signal from the sequencer 230. [ For example, the panel control signal generation circuit 232 generates gate drive pulses for driving the gate lines G (G1 to Gn). The panel control signal generation circuit 232 feeds back the timing signal to the sequencer 230 in order to synchronize with the sequencer 230. The sequencer 230 also gives a timing pulse to the drive IC chip CP as a reference for receiving image data.

Also, in the above embodiment, it has been described that the gain of each pixel signal is adjusted by the correction value at the stage of digital data. However, the gain of each pixel signal may be adjusted at the stage of the analog signal.

As described above, by correcting the image data output from the pixel data latch circuit 213 by the correction circuit, it is possible to generate a pixel signal having a value suitable for the pixel arrangement pattern in Figs. 9 to 12. In the case of the pixel arrangement pattern of Fig. 9, it is assumed that the gains of the pixel signals given to, for example, the R pixel and the G pixel are, for example, "1", respectively. At this time, the gain of the pixel signal given to the B1 pixel and the B2 pixel may be "1", but the gain of the pixel signal given to the B1 pixel and the B2 pixel may be adjusted. For example, the gain of the pixel signal given to the B1 pixel is made smaller than the gain of the pixel signal given to the B2 pixel, and the gain of the pixel signal given to the B2 pixel and the gain of the pixel signal given to the B1 pixel are made 2 Can be controlled.

The gains of the pixel signals given to the B1 pixel and the B2 pixel may be adjusted by varying the correction value if necessary. This adjustment is performed, for example, in the manufacturing process of the driving IC chip CP, the testing process, and the like.

In the case of the pixel arrangement pattern of Fig. 10, the gain of the pixel signal given to the R pixel and the G pixel is set to "2 ", for example. The gains of the pixel signals given to the B1 pixel and the B2 pixel are set to "1 ", for example. As a result, the RGB balance can be observed in the unit area of the complex color pixel. In this case as well, the gain of the pixel signal given to the pixels B1 and B2 may be adjusted by varying the correction value if necessary. This adjustment is performed, for example, in the manufacturing process of the driving IC chip CP, the testing process, and the like.

In the case of the pixel arrangement pattern of Fig. 11, for example, the gains of the pixel signals given to the R pixel and the G pixel are, for example, "1 ". At this time, the gain of the pixel signal given to the pixel B 2 is 2/4, and the gain of the pixel signal given to the pixel B 1 is 6/4. Thus, in the unit area of the complex color pixel, the gain of each pixel signal of the red pixel, the green pixel, and the blue pixel can be controlled to be 2.

In the case of the pixel arrangement pattern of Fig. 12, for example, the gains of the pixel signals given to the R pixel and the B pixel are, for example, "1 ". At this time, the gain of the pixel signal given to the pixel B2 is 2/4, and the gain of the pixel signal given to the pixel signal given to the pixel B1 is 6/4. Thus, in the unit area of the complex color pixel, the gain of each pixel signal of the red pixel, the green pixel, and the blue pixel can be controlled to be 2.

Also in each of the above embodiments, the gain of the pixel signal given to the pixels B1 and B2 may be adjusted by varying the correction value as necessary. This adjustment is performed, for example, in the manufacturing process of the driving IC chip CP, the testing process, and the like. The distribution of the pixel signal gains given to the B1 pixel and the B2 pixel may be adjusted by the light transmittance of the filter. Therefore, according to the display device of the embodiment, it is provided with an adjustment circuit capable of adjusting the distribution of the pixel signal gains to be supplied to at least the B1 pixel and the B2 pixel.

Fig. 17 is another embodiment, schematically showing a cross-sectional structure of a display device in which a display device using an organic EL element is used instead of a liquid crystal display device LCD. Since the organic EL element is self-emission, the display device shown in Fig. 17 is not provided with a light source different from that of the organic EL element.

The first substrate SUB1 and the second substrate SUB2 face each other. The first substrate SUB1 includes a first insulating substrate 110, a second insulating film 112, a third insulating film 113, and ribs 115 on the second substrate SUB2 side.

The first substrate SUB1 has switching elements SW1, SW2, SW3, ..., SW3 on the side facing the second substrate SUB2 of the first insulating substrate 110 , Organic EL elements OLED1, OLED2, OLED3 ... And the like. In Fig. 16, three switching elements SW1 to SW3 and organic EL elements OLED1 to OLED3 are shown representatively. The switching elements SW1 to SW3 are disposed on the first insulating substrate 110. [ The switching elements SW1 to SW3 are, for example, thin film transistors (TFTs) each including a semiconductor layer SC. The switching elements SW1 to SW3 all have the same structure. Here, the structure of the switching element SW1 will be described in more detail.

The switching element SW1 is of the top gate type, but may be of the bottom gate type. The semiconductor layer SC is formed on the first insulating substrate 110 and covered with the first insulating film 111. [ The first insulating film 111 is also disposed on the first insulating substrate 110. On the first insulating film 111, a gate electrode WG of the switching element SW1 is formed. The gate electrode WG is covered with a second insulating film 112. The second insulating film 112 is also disposed on the first insulating film 111. On the second insulating film 112, a source electrode WS and a drain electrode WD of the switching element SW1 are formed. The source electrode WS and the drain electrode WD are in contact with the semiconductor layer SC, respectively. The source electrode WS and the drain electrode WD are covered with a third insulating film 113. The third insulating film 113 is also disposed on the second insulating film 112.

The organic EL elements OLED1 to OLED3 are disposed on the third insulating film 113. [ The organic EL element OLED1 is electrically connected to the switching element SW1, the organic EL element OLED2 is electrically connected to the switching element SW2, and the organic EL element OLED3 is electrically connected to the switching element SW3. The organic EL elements OLED1 to OLED3 are all configured as a top emission type emitting white light toward the second substrate SUB. These organic EL elements OLED1 to OLED3 all have the same structure.

The organic EL element OLED1 has a pixel electrode PE1 formed on the third insulating film 113. [ The pixel electrode PE1 makes contact with the drain electrode WD of the switching element SW1 and is electrically connected to the switching element SW1. Similarly, the organic EL element OLED2 has a pixel electrode PE2 electrically connected to the switching element SW2, and the organic EL element OLED3 has a pixel electrode PE3 electrically connected to the switching element SW3.

The organic EL elements OLED1 to OLED3 further include an organic light emitting layer ORG and a common electrode CE. The organic light-emitting layer ORG is a white light-emitting layer which emits white light and is respectively located on the pixel electrodes PE1 to PE3. The organic light-emitting layer ORG is continuously formed over the organic EL elements OLED1-OLED3, for example, without interruption. The common electrode CE is located above the organic light emitting layer ORG. The common electrode CE is continuously formed over the organic EL elements OLED1 to OLED3 without interruption.

That is, the organic EL element OLED1 includes the pixel electrode PE1, the organic light emitting layer ORG, and the common electrode CE. Similarly, the organic EL element OLED2 includes the pixel electrode PE2, the organic light emitting layer ORG, and the common electrode CE, and the organic EL element OLED3 includes the pixel electrode PE3, the organic light emitting layer ORG, and the common electrode CE.

In the organic EL elements OLED1 to OLED3, a hole injection layer or a hole transport layer may be interposed between each of the pixel electrodes PE1 to PE3 and the organic light emitting layer ORG. Further, the organic light emitting layer ORG and the common electrode CE An electron injecting layer or an electron transporting layer may be interposed.

The organic EL elements OLED1 to OLED3 are partitioned by the ribs 115 respectively. The ribs 115 are formed on the third insulating film 113 and cover the respective edges of the pixel electrodes PE1 to PE3. Although the ribs 115 are not described in detail, they are formed in a lattice shape or a stripe shape on the third insulating film 113, for example.

Although not shown, it is preferable that the organic EL elements OLED1 to OLED3 are sealed by a transparent sealing film. As the sealing film, a single layer film or laminate of a transparent inorganic material (for example, silicon nitride, silicon oxide, or the like) can be applied, and a laminate in which a thin film of an inorganic material and a thin film of an organic material are alternately laminated is also applicable.

The second substrate SUB2 has color filters CF1-CF3 and the like on the side of the second insulating substrate 120 facing the first substrate SUB1. The color filter CF1 is a red (R) filter that opposes the organic EL element OLED1 and transmits light having a red wavelength in white. The color filter CF2 is a green (G) filter which opposes the organic EL element OLED2 and transmits light of a green wavelength in white. The color filter CF3 is a blue (B1 or B2) filter which opposes the organic EL element OLED3 and transmits light having a blue wavelength in white.

The first substrate SUB1 and the second substrate SUB2 are bonded to each other by a transparent adhesive (or a filler) 130. [

In this display apparatus, when each of the organic EL elements OLED1-OLED3 emits light, each of the emitted light (white light) is emitted to the outside through the color filter CF1, the color filter CF2, and the color filter CF3. At this time, of the white light emitted from the organic EL element OLED1, light of a red wavelength transmits through the color filter CF1. Among the white light emitted from the organic EL element OLED2, light having a green wavelength transmits the color filter CF2. Of the white light emitted from the organic EL element OLED3, the blue wavelength light transmits through the color filter CF3. Thereby, color display is realized.

In the above-described display device, the arrangement of the pixels can be made to the pixel arrangement pattern of Figs. 9 to 12. Fig. In this display device, a display device capable of suppressing the output of light having a peak near a wavelength of 460 nm could be realized.

One embodiment of the disclosed invention is as follows.

(1) the first substrate includes first, second, third, and fourth pixel electrodes,

Wherein the layer of the color filter comprises a red filter opposed to the first pixel electrode, a green filter opposed to the second pixel electrode, and a first filter having a peak of transmittance at a wavelength shorter than 460 nm A blue filter, and a second blue filter opposed to the fourth pixel electrode and having a peak of transmittance on the longer wavelength side than the wavelength of 460 nm.

(2) The display device according to (1), wherein the layer of the color filter is formed on a second substrate facing the first substrate.

(3) The display device according to (1), wherein the layer of the color filter is formed on the first substrate.

(4) a liquid crystal layer held between the first substrate and the second substrate; and a backlight unit disposed on a back surface side of the first substrate, wherein the backlight unit includes: A first white light source facing the incident surface and having a peak of an emission spectrum on a shorter wavelength side than the wavelength of 460 nm and a second white light source opposed to the incident surface and having a wavelength 460 And a second white light source having a peak of an emission spectrum on a longer wavelength side than nm.

(5) The display device according to (4), wherein the first white light source and the second white light source include a blue light emitting diode and a yellow phosphor.

(6) The display device according to (4), wherein the first white light source and the second white light source are quantum dots.

(7) The display device according to (1), wherein the first substrate includes a white light emitting layer positioned on the first to fourth pixel electrodes and a common electrode located on the white light emitting layer.

(8) the red filter is arranged in a first column in a first direction, the green filter is arranged in a second column in the first direction, and the first blue filter and the second blue filter are arranged in a third column in the first direction , And the first blue filter and the second blue filter are arranged in a second direction crossing the first direction.

(9) the red filter and the green filter are alternately arranged in the first direction and the first column, and the first blue filter and the second blue filter are arranged in the first direction and the second column , And the display device described in (1).

(10) a first column arranged in a first direction and having a plurality of the red filters, a second column arranged in the first direction and having a plurality of the green filters, arranged in a column next to the first column, The first blue filter and the second blue filter being arranged in a first direction and having a plurality of the first blue filter and the second blue filter and having a third column arranged in the next column of the second column, Is arranged in a second direction intersecting with the first direction.

(11) A liquid crystal display comprising: a first row arranged in a first direction and having a plurality of said red filters and a plurality of said green filters; and a second row arranged in said first direction and having a plurality of said first blue filters and said second blue filters , And a second row arranged in the next column of the first column, and the first blue filter and the second blue filter are arranged in a second direction intersecting the first direction .

(12) The display device according to (1), wherein the first blue filter has an area larger than that of the second blue filter.

(13) A red pixel including the first pixel electrode, a green pixel including the second pixel electrode, a first blue pixel including the third pixel electrode, and a second blue pixel including the fourth pixel electrode And a driving circuit for supplying pixel signals to the red pixel, the green pixel, the first blue pixel and the second blue pixel, respectively, and the driving circuit supplies at least the first blue pixel and the second blue pixel And a circuit for adjusting the gain of the pixel signal.

While several embodiments of the present invention have been described, these embodiments are provided by way of example only, and are not intended to limit the scope of the present invention. Indeed, the novel devices described herein can be implemented in a variety of different forms, and various omissions, substitutions, and transformations can be made without departing from the spirit of the invention in the form of the devices described herein . The appended claims and their equivalents are intended to cover such forms or modifications as fall within the scope and spirit of the invention.

Claims (13)

As a display device,
The first substrate includes first, second, third, and fourth pixel electrodes,
Wherein the layer of the color filter comprises a red filter opposed to the first pixel electrode, a green filter opposed to the second pixel electrode, and a first filter having a peak of transmittance at a wavelength shorter than 460 nm A blue filter, and a second blue filter opposed to the fourth pixel electrode and having a peak of transmittance at a wavelength longer than 460 nm,
Wherein the red filter is arranged in a first column in a first direction, the green filter is arranged in a second column in the first direction and the first blue filter and the second blue filter are arranged in a third column in the first direction,
And the first blue filter and the second blue filter are arranged in a second direction crossing the first direction. The method according to claim 1,
And the layer of the color filter is formed on a second substrate facing the first substrate. The method according to claim 1,
And the layer of the color filter is formed on the first substrate. 3. The method of claim 2,
A liquid crystal layer held between the first substrate and the second substrate,
Further comprising a backlight unit disposed on a rear surface side of the first substrate,
The backlight unit includes:
A light guide plate having an exit surface facing the first substrate and an incident surface intersecting the exit surface,
A first white light source opposed to the incident surface and having a peak of an emission spectrum on a shorter wavelength side than a wavelength of 460 nm;
And a second white light source facing the incident surface and having a peak of emission spectrum on a longer wavelength side than a wavelength of 460 nm. 5. The method of claim 4,
Wherein the first white light source and the second white light source include a blue light emitting diode and a yellow phosphor. 5. The method of claim 4,
Wherein the first white light source and the second white light source are quantum dots. The method according to claim 1,
Wherein the first substrate includes a white light emitting layer located on the first to fourth pixel electrodes and a common electrode located on the white light emitting layer. As a display device,
The first substrate includes first, second, third, and fourth pixel electrodes,
Wherein the layer of the color filter comprises a red filter opposed to the first pixel electrode, a green filter opposed to the second pixel electrode, and a first filter having a peak of transmittance at a wavelength shorter than 460 nm A blue filter, and a second blue filter opposed to the fourth pixel electrode and having a peak of transmittance at a wavelength longer than 460 nm,
Wherein the red filter and the green filter are alternately arranged in a first direction and in a first direction and the first blue filter and the second blue filter are arranged in the first direction and the second column. As a display device,
The first substrate includes first, second, third, and fourth pixel electrodes,
Wherein the layer of the color filter comprises a red filter opposed to the first pixel electrode, a green filter opposed to the second pixel electrode, and a first filter having a peak of transmittance at a wavelength shorter than 460 nm A blue filter, and a second blue filter opposed to the fourth pixel electrode and having a peak of transmittance at a wavelength longer than 460 nm,
A first row arranged in a first direction and having a plurality of said red filters,
A second column arranged in the first direction and having a plurality of the green filters, arranged in the next column of the first column,
And a third column arranged in the first direction and having a plurality of the first blue filters and the second blue filters and arranged in a column next to the second column,
And the first blue filter and the second blue filter are arranged in a second direction intersecting with the first direction. As a display device,
The first substrate includes first, second, third, and fourth pixel electrodes,
Wherein the layer of the color filter comprises a red filter opposed to the first pixel electrode, a green filter opposed to the second pixel electrode, and a first filter having a peak of transmittance at a wavelength shorter than 460 nm A blue filter, and a second blue filter opposed to the fourth pixel electrode and having a peak of transmittance at a wavelength longer than 460 nm,
A first row arranged in a first direction and having a plurality of the red filters and the plurality of green filters,
And a second row arranged in the first direction and having a plurality of the first blue filter and the second blue filter and arranged in the next column of the first column,
And the first blue filter and the second blue filter are arranged in a second direction intersecting with the first direction. 11. The method according to any one of claims 8 to 10,
A second substrate facing the first substrate,
A liquid crystal layer held between the first substrate and the second substrate,
Further comprising a backlight unit disposed on a rear surface side of the first substrate,
The backlight unit includes:
A light guide plate having an exit surface facing the first substrate and an incident surface intersecting the exit surface,
A first white light source opposed to the incident surface and having a peak of an emission spectrum on a shorter wavelength side than a wavelength of 460 nm;
And a second white light source facing the incident surface and having a peak of emission spectrum on a longer wavelength side than a wavelength of 460 nm. The method according to claim 1,
Wherein the first blue filter has an area larger than that of the second blue filter. The method according to claim 1,
A second pixel including the first pixel electrode, a second pixel including the second pixel electrode, a second pixel including the third pixel electrode, and a second pixel including the fourth pixel electrode,
Further comprising a driving circuit for supplying pixel signals to the red pixel, the green pixel, the first blue pixel, and the second blue pixel,
Wherein the driving circuit includes a circuit for adjusting a gain of a pixel signal to be supplied to at least the first blue pixel and the second blue pixel.

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