JP2008292540A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress fluctuation of luminance in a liquid crystal display device having a curved surface shape. <P>SOLUTION: The liquid crystal display 30a includes a liquid crystal display panel 20a wherein a plurality of pixels are provided in a matrix shape and which is curved in one direction and a backlight 10a of an edge light system which is curved in one direction so as to be opposed to the liquid crystal display panel 20a. The backlight 10a has an emission angle adjusting part for emitting light from a light source in the normal direction of an emission surface for every region corresponding to each pixel and a center angle of an arc formed by a cross section along circumferential direction of the liquid crystal display panel 20a is set to be ≤1/2 of an angle range in which luminance of emission light is in a prescribed range based on luminance distribution formed by previously measuring luminance of emission light at measuring points on a circumferential surface of the backlight 10a over a necessary angle. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device, and more particularly to a curved liquid crystal display device.

  A liquid crystal display device includes, for example, a liquid crystal display panel including an active matrix substrate and a counter substrate that are arranged to face each other, and a liquid crystal layer provided between the two substrates, and a planar light beam on the liquid crystal display panel. And a backlight for supplying.

  FIG. 13 is a cross-sectional view of a general backlight 110a.

  As shown in FIG. 10, the backlight 110 a includes a linear light source 101, a light guide plate 102 provided on the side of the light source 101, a reflection sheet 103 provided on the lower surface side of the light guide plate 102, and a reflection sheet. 103, a metal frame 104 provided on the lower surface side of 103, a diffusion sheet 105 provided on the upper surface side of the light guide plate 102, and a pair of lens sheets 106 and 107 provided on the upper surface side of the diffusion sheet 105. . The backlight 110a emits light from the light source 101 obliquely from the upper surface of the light guide plate 102 by exceeding the critical angle while propagating through the light guide plate 102 while repeating total reflection. After that, the pair of lens sheets 106 and 107 are configured to emit light in a direction perpendicular to the upper surface (emission surface) of the light guide plate 102.

  For example, Patent Document 1 discloses that a direct light from a linear light source disposed directly under the center of a liquid crystal display panel and a reflected light emitted from a parabolic reflector disposed under the linear light source are 2 with a Fresnel lens. A display device is disclosed in which light is bent and uniformed in the effective viewing angle direction of a liquid crystal display panel by refraction.

Patent Document 2 discloses an actual display by using a photo-alignment control element in which minute cylindrical lens-like curved surfaces or ellipsoidal lens-like curved surfaces are arranged in a certain direction in a film surface on a transparent film. A backlight that improves brightness is disclosed.
JP-A-5-61043 JP-A-6-75220

  When a flat liquid crystal display panel and a backlight (110a, see FIG. 13) are simply deformed to form a curved liquid crystal display device, as shown in FIG. Since the light L from the light 110b is easily supplied in an oblique direction to the liquid crystal display panel (not shown) via the curved lens sheets 106 and 107, the liquid crystal display device including the backlight 110b and the liquid crystal display panel Then, there is a possibility that the brightness when viewed obliquely along the cross section along the circumferential direction of the curved display surface varies depending on the position.

  The present invention has been made in view of the above points, and an object of the present invention is to improve display quality by suppressing variation in luminance in a curved liquid crystal display device.

  In order to achieve the above object, the present invention has an emission angle adjusting unit for emitting light from the light source in the normal direction of the emission surface for each region corresponding to each pixel of the backlight, and a liquid crystal display panel The center angle of the arc formed by the cross-section along the circumferential direction of the backlight is determined based on the brightness distribution obtained by measuring the brightness of the emitted light at a measurement point on the peripheral surface of the backlight over the required angle in advance. The angle is set to ½ or less of the angle range that falls within the range.

  Specifically, a liquid crystal display device according to the present invention includes a liquid crystal display panel having a plurality of pixels provided in a matrix and curved in one direction, a light guide plate curved in one direction so as to face the liquid crystal display panel, and A liquid crystal display device including an edge light type backlight having a linear light source provided along a non-curved direction of the light guide plate, wherein the backlight is provided for each region corresponding to each pixel. The center angle of the circular arc formed by the cross section along the circumferential direction of the liquid crystal display panel has an emission angle adjusting unit for emitting light from the light source through the light guide plate in the normal direction of the emission surface. The luminance of the emitted light falls within a predetermined range based on the luminance distribution obtained by measuring the luminance of the emitted light at the measurement point on the peripheral surface of the backlight over the required angle along the circumferential direction of the backlight. 1/2 of the angle range Characterized in that it is set down.

  According to the above configuration, in the edge-light type backlight that is curved in one direction, the emission angle adjustment unit causes the light from the light source to exit through the light guide plate in each region corresponding to each pixel of the liquid crystal display panel. The liquid crystal display panel curved in one direction from the backlight is supplied with radial planar light whose emission direction is controlled. The central angle of the liquid crystal display panel curved in one direction is determined based on the luminance distribution obtained by measuring the luminance of the emitted light at a measurement point on the peripheral surface of the backlight over the required angle in advance. Since it is set to 1/2 or less of the angle range that falls within the range, only the light that falls within the predetermined range among the light emitted from the backlight is supplied to the liquid crystal display panel that is curved in one direction. become. As a result, in a curved liquid crystal display device, planar light whose emission direction is controlled and whose luminance is suppressed is supplied from a backlight curved in one direction to a liquid crystal display panel curved in one direction. Therefore, variation due to the luminance position when the liquid crystal display device is viewed obliquely along the cross section along the circumferential direction is suppressed. Therefore, in a curved liquid crystal display device, it is possible to improve display quality by suppressing variations in luminance.

  The exit angle adjusting section has a plurality of V-shaped grooves formed on the surface of the light guide plate opposite to the liquid crystal display panel so as to extend in parallel to each other in a direction intersecting the circumferential direction of the light guide plate. A plurality of V-shaped cross sections that are sandwiched between the first prism, the light guide plate and the liquid crystal display panel and extend parallel to each other in a direction intersecting the circumferential direction on the light guide plate side on the surface on the light guide plate side. You may provide the 2nd prism in which the groove | channel was formed.

  According to the above configuration, each pixel of the liquid crystal display panel is provided by each groove of the first prism provided on the bottom surface of the light guide plate and each groove of the second prism sandwiched between the light guide plate and the liquid crystal display panel. Since the light from the light source is emitted in the normal direction of the emission surface via the light guide plate for each corresponding region, the effect of the present invention is specifically achieved.

  The interval between the grooves in the first prism may become smaller as the distance from the light source increases.

  According to said structure, since the groove | channel for reflecting the light from a light source is formed many as it leaves | separates from a light source in the bottom face of a light-guide plate, the location away from the light source of the backlight from which the light from a light source becomes weak In this case, it becomes possible to reflect a large amount of light from the light source, and to make the luminance of the light emitted from the backlight uniform along the circumferential direction.

  The exit angle adjusting section has a plurality of V-shaped grooves formed on the surface of the light guide plate opposite to the liquid crystal display panel so as to extend in parallel to each other in a direction intersecting the circumferential direction of the light guide plate. A diffusion plate for diffusing the light from the light guide plate, and a light for aligning the light from the diffusion plate in one direction, sandwiched in order from the light guide plate side between the prism, the light guide plate and the liquid crystal display panel One lens sheet and a second lens sheet for aligning light from the first lens sheet in a direction intersecting the one direction may be provided.

  According to said structure, each groove | channel of the prism provided in the bottom face of the light-guide plate, and the diffuser plate provided between the light-guide plate and the liquid crystal display panel, the 1st lens sheet, and the 2nd lens sheet, liquid crystal display panel Since the light from the light source is emitted in the normal direction of the emission surface via the light guide plate for each region corresponding to each of the pixels, the effect of the present invention is specifically exhibited.

  The interval between the grooves in the prism may decrease as the distance from the light source increases.

  According to said structure, since the groove | channel for reflecting the light from a light source is formed many as it leaves | separates from a light source in the bottom face of a light-guide plate, the location away from the light source of the backlight from which the light from a light source becomes weak In this case, it becomes possible to reflect a large amount of light from the light source, and to make the luminance of the light emitted from the backlight uniform along the circumferential direction.

  The predetermined range may be 84% or more and 100% or less of the luminance of the emitted light in the normal direction of the measurement point.

  According to the above configuration, the in-plane luminance variation in the curved liquid crystal display device is 20% or less, and the operational effect of the present invention is effective in the liquid crystal display device for amusement applications in which the tolerance range of the luminance variation is generally wide. To be played.

  The predetermined range may be 91% or more and 100% or less of the luminance of the emitted light in the normal direction of the measurement point.

  According to the above configuration, the in-plane luminance variation of the curved liquid crystal display device is 10% or less, and the operation and effect of the present invention can be achieved in a liquid crystal display device for mobile phones that generally has a narrow tolerance range of luminance variation. Played effectively.

  According to the present invention, the backlight has the emission angle adjustment unit for emitting the light from the light source in the normal direction of the emission surface for each region corresponding to each pixel, and extends along the circumferential direction of the liquid crystal display panel. The central angle of the arc formed by the cross section is an angle range in which the luminance of the emitted light falls within a predetermined range based on the luminance distribution obtained by measuring the luminance of the emitted light at a measurement point on the peripheral surface of the backlight over the required angle in advance. Since it is set to 1/2 or less, in a curved liquid crystal display device, variation in luminance can be suppressed and display quality can be improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following embodiments.

Embodiment 1 of the Invention
1 to 8 show Embodiment 1 of a liquid crystal display device according to the present invention.

  FIG. 1 is a cross-sectional view of the liquid crystal display device 30a of this embodiment. 2 is a plan view showing each pixel of the liquid crystal display panel 20a constituting the liquid crystal display device 30a, and FIG. 3 is a cross-sectional view of the liquid crystal display panel 20a. Further, FIG. 4 is a cross-sectional view of the backlight 10a constituting the liquid crystal display device 30a.

  As shown in FIG. 1, the liquid crystal display device 30a includes a liquid crystal display panel 20a curved in one direction and an edge light type backlight 10a curved in one direction so as to face the liquid crystal display panel 20a. .

  As shown in FIGS. 1 and 3, the liquid crystal display panel 20a includes a first substrate 21a and a second substrate 22a arranged to face each other, a liquid crystal layer 24 provided between the substrates 21a and 22a, The sealing material 23 provided so that the liquid crystal layer 24 may be enclosed between both board | substrates 21a and 22a is provided.

  A phase difference plate 25a and a polarizing plate 26a are sequentially provided on the surface of the first substrate 21a opposite to the liquid crystal layer 24.

  A phase difference plate 25b and a polarizing plate 26b are sequentially provided on the surface of the second substrate 22a opposite to the liquid crystal layer 24.

  As shown in FIG. 3, the first substrate 21a protrudes from the second substrate 22a, and an IC (integrated circuit) chip 27, an FPC (flexible printed circuit) 28, and the like are provided on the protruding portion. Yes.

  The first substrate 21a is provided with a plurality of first transparent electrodes (not shown) so as to extend in parallel with each other. The second substrate 22a is provided with a plurality of second transparent electrodes (not shown) so as to extend in parallel with each other in a direction orthogonal to the first transparent electrodes.

Here, in the liquid crystal display panel 20a, a pixel which is the minimum unit of an image is configured for each intersection of the plurality of first transparent electrodes and the plurality of second transparent electrodes, and each pixel E as shown in FIG. _{R 1} , E _G, and E _B are arranged in a matrix. Further, in FIG. 2, a pixel in which the pixel E _R is for displaying red, a pixel where the pixel E _G is to display a green pixel E _B is the pixel to be displayed blue. For example, when the panel outer shape is 1.8 inches, the horizontal 128 × 3 (RGB) dots, and the vertical 160 dots, the size of each pixel E _R , E _G and E _B is as shown in FIG. Wa = 0.060 mm, Wb = 0.015 mm, Wc = 0.200 mm and Wd = 0.015 mm.

The second substrate 22a during each pixel E _R, the E _G and E _B, red layer, a color filter green layer and blue layer is provided respectively, the respective colored layers (red layer, a green layer and blue layer) And a black matrix.

  When the liquid crystal display panel 20a having the above-described configuration applies a predetermined voltage to each first transparent electrode and each second transparent electrode in time series during image display, the first transparent electrode selected at a certain point in time is displayed. A voltage is applied to the liquid crystal layer 24 in the pixel at the intersection of the second transparent electrodes, and the alignment state of the liquid crystal molecules constituting the liquid crystal layer 24 changes. In the liquid crystal display panel 20a, an image is obtained by adjusting the transmittance of light from the backlight 10a by utilizing the change in the alignment state of liquid crystal molecules according to the magnitude of the voltage applied to the liquid crystal layer 24. Is displayed.

  As shown in FIG. 4, the backlight 10 a includes a light guide plate 2 curved in one direction, a linear light source 1 provided along a non-curved side of the light guide plate 2, and a lower surface ( The reflection sheet 3 provided on the bottom surface side and the second prism Pb provided on the top surface side of the light guide plate 2 are provided.

  Further, the backlight 10a is inclined from the upper surface of the light guide plate 2 to the upper surface by exceeding the critical angle while the light L from the light source 1 propagates through the curved light guide plate 2 while repeating total reflection. After exiting in the direction, the second prism Pb, which will be described later, emits in the direction normal to the exit surface.

  The light source 1 is, for example, an LED (light-emitting diode), a cold cathode fluorescent tube, a hot cathode fluorescent tube, or the like.

  The light guide plate 2 is made of, for example, a transparent acrylic resin. A plurality of grooves C extending in parallel to each other in a direction orthogonal to the circumferential direction are formed on the lower surface of the light guide plate 2. Here, as shown in FIG. 4, each of the grooves C has a V-shaped cross section, and the interval decreases as the distance from the light source increases. The lower surface of each light guide plate 2 where the grooves C are formed is a first prism Pa for reflecting the light L from the light source 1.

  The reflection sheet 3 is made of, for example, a white PET (polyethylene terephthalate) film.

  For example, as shown in FIG. 4, the second prism Pb is configured such that a plurality of triangular prisms each having an inverted triangular cross section are arranged in parallel with each other along the circumferential direction of the light guide plate 2. ing. Here, in the second prism Pb, as shown in FIG. 4, a groove C having a V-shaped cross section is formed by the side surfaces of a pair of adjacent triangular prisms.

First prism Pa and the second prism Pb is emitted, for example, each pixel _E R of the liquid crystal display panel 20a, each region overlapping with the _{E G} and _{E B,} the light L from the light source 1 in the normal direction of the emission surface The emission angle adjustment part T for making it comprise is comprised. Here, the first prism Pa is configured such that the light L from the light source 1 is totally reflected by the slope of each groove C. The second prism Pb is configured such that the light L from the light source 1 is reflected and refracted by the slope of each groove C.

  Next, a method for setting the degree of bending of the liquid crystal display panel 20a will be described.

  First, the luminance distribution of the emitted light is measured for the curved backlight 10a having a predetermined radius of curvature. Here, FIG. 5 is a schematic diagram showing a method of measuring the emitted light distribution of the backlight 10a.

  Specifically, as shown in FIG. 5, a luminance meter 40 (for example, EZContrast 160D manufactured by ELDIM, measurement diameter: 1 mm) is installed above the measurement point M on the center line X on the peripheral surface of the backlight 10a. Thereafter, the backlight 10a is turned on, and the luminance at the measurement point M is measured while moving the luminance meter 40 along the circumferential direction (X direction) by a required angle (centering on the measurement point M).

  FIG. 6 is a graph schematically showing the measurement result of the emitted light distribution of the backlight 10a. Here, in FIG. 6, the horizontal axis indicates the angle θ with respect to the normal direction of the measurement point M, and the vertical axis indicates the luminance B.

  In the backlight 10a, as shown in FIG. 6, the luminance of the front (θ = 0 °) is maximum. When the luminance variation of α% or more is allowed with respect to the front luminance, the allowable angle range is A as shown in FIG. Therefore, the central angle Z (see FIG. 3) of the arc formed by the cross section along the circumferential direction of the liquid crystal display panel 20a is ½ or less of A. Thereby, only the light whose luminance falls within a predetermined range (α% or more with respect to the front luminance) among the light emitted from the backlight 10a is supplied to the liquid crystal display panel 20a.

  Here, for example, the liquid crystal display panel 20a is manufactured by first manufacturing the first substrate 21a and the second substrate 22a by using a plastic substrate having a thickness of about 50 μm by a roll-to-roll method. The substrate 21a and the second substrate 22a can be manufactured by pasting them together through the sealing material 23 and the liquid crystal layer 24, and forming the curved shape when the sealing material 23 is cured. The first substrate 21a and the second substrate 22a are not limited to the plastic substrates described above, and each glass substrate may be thinned to a thickness of about 100 μm after being manufactured using a glass substrate.

  In addition, the backlight 10a is formed by heat-processing a flat light guide plate into a curved shape or by previously forming the light guide plate 2 into a curved shape to produce the light guide plate 2, and then the light source 1, the reflective sheet 3, and the second prism Pb. Can be manufactured.

  Furthermore, the liquid crystal display device 30a can be manufactured by modularizing the liquid crystal display panel 20a to which the IC chip 27 and the FPC 28 are attached and the backlight 10a by fixing them to a metal bezel or chassis. .

  Next, a specific experiment will be described.

  In the present embodiment, a liquid crystal display device 30a having a screen size of 2.2 inches will be described. In FIG. 3, the panel length Y, which is the length along the circumferential direction of the second substrate 22a, is 56.1 mm.

  FIG. 7 is a graph showing a specific outgoing light distribution of the backlight 10a corresponding to FIG.

  Here, the curvature radius of the backlight 10a is 400 mm.

  When the in-plane luminance variation in the liquid crystal display device 30a is 10% or less (for mobile phone use), the front luminance is 91% or more by 100 (%) / 110 (%) × 100 = 90.9 (%). And it is sufficient. The angle range Aa in which the luminance of the emitted light is 91% or more of the front luminance is ± 9.5 ° (= 19 °) by reading the numerical value from the graph of the emitted light distribution in FIG. At this time, the central angle Z of the arc formed by the cross section along the circumferential direction of the liquid crystal display panel 20a is 9.5 ° or less, which is 1/2 of Aa. And the curvature radius R of the liquid crystal display panel 20a is 338.3 mm or more by 180L / (πZ) (see FIG. 8).

  Further, when the in-plane luminance variation in the liquid crystal display device 30a is set to 20% or less (for amusement use), 100% (%) / 120 (%) × 100 = 83.3 (%) and 84% of the front luminance. That is all. The angle range Ab in which the luminance of the emitted light is 84% or more of the front luminance is ± 14 ° (= 28 °) by reading the numerical value from the graph of the emitted light distribution in FIG. At this time, the central angle Z of the arc formed by the cross section along the circumferential direction of the liquid crystal display panel 20a is equal to or less than 14 ° which is 1/2 of Aa. The curvature radius R of the liquid crystal display panel 20a is 229.6 mm or more by 180 × L / (πZ) (see FIG. 8).

  As described above, in the curved liquid crystal display device 30a, the center angle Z and the radius of curvature R of the arc of the liquid crystal display panel 20a can be set according to the allowable range of luminance variation.

As described above, according to the liquid crystal display device 30a of the present embodiment, in the edge light type backlight 10a curved in one direction, each groove C of the first prism Pa provided on the bottom surface of the light guide plate 2, as well as the emission angle adjusting section T made of each groove C of the second prism Pb which is sandwiched between the light guide plate 2 and the liquid crystal display panel 20a, the pixels E _R of the liquid crystal display panel _20a, overlaps with the E _G and E _B Since the light L from the light source 1 is emitted in the normal direction of the emission surface via the light guide plate 2 for each region, the emission direction is controlled in the liquid crystal display panel 20a curved in one direction from the backlight 10a. Radial planar light is supplied. The central angle Z of the liquid crystal display panel 20a curved in one direction is determined based on the luminance distribution obtained by measuring the luminance of the emitted light at the measurement point M on the peripheral surface of the backlight 10a in advance over the required angle. Is set to ½ or less of the angle range A (Aa and Ab) that falls within a predetermined range, the liquid crystal display panel 20a curved in one direction has a luminance out of the light emitted from the backlight 10a. Only those that fall within a predetermined range will be supplied. Thereby, in the curved liquid crystal display device 30a, the emission direction is controlled from the backlight 10a curved in one direction to the liquid crystal display panel 20a curved in one direction, and the variation in luminance is suppressed. Since light is supplied, it is possible to suppress variations due to the position of the luminance when the liquid crystal display device 30a is viewed obliquely along the cross section along the circumferential direction. Therefore, in the curved liquid crystal display device 30a, variations in luminance can be suppressed and display quality can be improved.

  Further, according to the liquid crystal display device 30a of the present embodiment, the distance between the grooves C in the first prism Pa becomes smaller as the distance from the light source 1 decreases, so that the light from the light source 1 is reflected on the lower surface of the light guide plate 2. More grooves C are formed as the distance from the light source 1 increases. Therefore, a large amount of light from the light source 1 can be reflected at a location away from the light source 1 of the backlight 10a where the light from the light source 1 is weakened, so that the luminance of the emitted light from the backlight 10a is adjusted along its circumferential direction. And uniform.

<< Embodiment 2 of the Invention >>
FIG. 9 is a cross-sectional view of the backlight 10b constituting the liquid crystal display device of the present embodiment. In addition, in each following embodiment, the same code | symbol is attached | subjected about the same part as FIGS. 1-8, and the detailed description is abbreviate | omitted.

  In the first embodiment, the exit angle adjustment unit T includes the first prism Pa and the second prism Pb. However, in the present embodiment, as illustrated in FIG. 9, the exit angle adjustment unit T is used as the first prism Pa. The corresponding prism P, the diffusion plate 5 for diffusing light from the light guide plate 2, the first lens sheet 6 for aligning the light from the diffusion plate 5 in the circumferential direction of the light guide plate 2, and the first lens sheet 6, for example. For example, a second lens sheet 7 for aligning light from the light guide plate 2 in a direction orthogonal to the circumferential direction of the light guide plate 2 is provided.

  As the first lens sheet 6, for example, BEF (Brightness Enhancement Film) manufactured by 3M is suitably used. Further, as the second lens sheet 7, for example, BEF-RP (Brightness Enhancement Film-Reflective Polarizer) manufactured by 3M is preferably used.

According to the liquid crystal display device including the backlight 10b of the present embodiment, the emission angle adjustment unit including the prism P, the diffusion plate 5, the first lens sheet 6, and the second lens sheet 7 provided on the bottom surface of the light guide plate 2. the T, each pixel E _R of the liquid crystal display _panel, since the emitted in the normal direction of the emission surface light L via a light guide plate 2 from the light source 1 in each region overlapping with E _G and E _B, the above-described embodiment As in the case of No. 1, in a curved liquid crystal display device, variation in luminance can be suppressed and display quality can be improved.

<< Embodiment 3 of the Invention >>
FIG. 10 is a cross-sectional view of the liquid crystal display device 30b of this embodiment. FIG. 11 is a schematic diagram showing a method for measuring the emitted light distribution of the backlight 10c constituting the liquid crystal display device 30b.

  In each of the above embodiments, the liquid crystal display device (30a) is convexly curved upward. In this embodiment, as shown in FIG. 10, the first substrate 21b and the second substrate constituting the liquid crystal display panel 20b. The substrate 22b and the backlight 10c are each curved upwardly in a concave shape, and the liquid crystal display device 30b is curved upwardly in a concave shape. Since this liquid crystal display device 30b is the same as the liquid crystal display device 30a of the first embodiment except for the direction of curvature, detailed description thereof is omitted. As shown in FIG. 11, the method of measuring the emitted light distribution of the backlight 10b may be the same as that of the first embodiment, except that the shape of the backlight described in FIG. 5 is reversed. .

<< Embodiment 4 of the Invention >>
FIG. 12 is a cross-sectional view of a liquid crystal display panel 20c constituting the liquid crystal display device of the present embodiment.

  In each of the above embodiments, the passive matrix driving liquid crystal display panel has been described. However, the present invention can also be applied to an active matrix driving liquid crystal display panel. In the liquid crystal display panel 20c shown in FIG. 12, the first substrate 21c is a so-called active matrix substrate, and the second substrate 21c is a so-called counter substrate.

  As described above, the present invention is useful for a liquid crystal display device having a curved surface because variations in luminance are suppressed even for a curved display.

3 is a cross-sectional view of a liquid crystal display device 30a according to Embodiment 1. FIG. It is a top view which shows the pixel of the liquid crystal display panel 20a which comprises the liquid crystal display device 30a. It is sectional drawing of the liquid crystal display panel 20a which comprises the liquid crystal display device 30a. It is sectional drawing of the backlight 10a which comprises the liquid crystal display device 30a. It is a schematic diagram which shows the method of measuring the emitted light distribution of the backlight 10a. It is a graph which shows typically the measurement result of the outgoing light distribution of back light 10a. It is a graph which shows the specific emitted light distribution of a backlight. It is a graph which shows the relationship between the curvature radius and center angle of a liquid crystal display panel. It is sectional drawing of the backlight 10b which comprises the liquid crystal display device which concerns on Embodiment 2. FIG. It is sectional drawing of the liquid crystal display device 30b which concerns on Embodiment 3. FIG. It is a schematic diagram which shows the method of measuring the emitted light distribution of the backlight 10c which comprises the liquid crystal display device 30b. It is sectional drawing of the liquid crystal display panel 20c which comprises the liquid crystal display device which concerns on Embodiment 4. It is sectional drawing of the general backlight 110a. It is sectional drawing of the backlight 110b which comprises the conventional curved-surface-shaped liquid crystal display device.

Explanation of symbols

C groove E _R , E _G , E _B pixel P prism Pa first prism Pb second prism T emission angle adjustment unit Z central angle 1 light source 2 light guide plate 5 diffusion plate 6 first lens sheet 7 second lens sheets 10a to 10c Backlight 20a-20c Liquid crystal display panel 30a, 30b Liquid crystal display device

Claims (7)

A plurality of pixels provided in a matrix and a liquid crystal display panel curved in one direction;
A liquid crystal display device comprising: a light guide plate curved in one direction so as to face the liquid crystal display panel; and an edge light type backlight having a linear light source provided along the non-curved direction of the light guide plate Because
The backlight has an emission angle adjustment unit for emitting light from the light source in the normal direction of the emission surface via the light guide plate for each region corresponding to each pixel,
The central angle of the arc formed by the cross section along the circumferential direction of the liquid crystal display panel is the brightness of the emitted light at the measurement point on the circumferential surface of the backlight over the required angle along the circumferential direction of the backlight. A liquid crystal display device characterized in that, based on a luminance distribution measured in advance, the luminance of the emitted light is set to ½ or less of an angular range that falls within a predetermined range. The liquid crystal display device according to claim 1,
The exit angle adjusting section has a plurality of V-shaped grooves formed on the surface of the light guide plate opposite to the liquid crystal display panel so as to extend in parallel to each other in a direction intersecting the circumferential direction of the light guide plate. A plurality of V-shaped cross sections that are sandwiched between the first prism, the light guide plate and the liquid crystal display panel and extend parallel to each other in a direction intersecting the circumferential direction on the light guide plate side on the surface on the light guide plate side. A liquid crystal display device comprising: a second prism formed with a groove. The liquid crystal display device according to claim 2,
2. A liquid crystal display device according to claim 1, wherein a distance between the grooves in the first prism decreases as the distance from the light source increases. The liquid crystal display device according to claim 1,
The exit angle adjusting section has a plurality of V-shaped grooves formed on the surface of the light guide plate opposite to the liquid crystal display panel so as to extend in parallel to each other in a direction intersecting the circumferential direction of the light guide plate. A diffusion plate for diffusing the light from the light guide plate, and a light for aligning the light from the diffusion plate in one direction, sandwiched in order from the light guide plate side between the prism, the light guide plate and the liquid crystal display panel A liquid crystal display device comprising: a lens sheet; and a second lens sheet for aligning light from the first lens sheet in a direction intersecting the one direction. The liquid crystal display device according to claim 4,
The liquid crystal display device according to claim 1, wherein an interval between the grooves in the prism decreases as the distance from the light source increases. The liquid crystal display device according to claim 1,
The liquid crystal display device according to claim 1, wherein the predetermined range is 84% or more and 100% or less of the luminance of the emitted light in the normal direction of the measurement point. The liquid crystal display device according to claim 1,
The liquid crystal display device according to claim 1, wherein the predetermined range is 91% or more and 100% or less of the luminance of emitted light in the normal direction of the measurement point.

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