JP2008112005A - Liquid crystal display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display, wherein the color unevenness and luminance unevenness of light, transmitted through a liquid crystal display panel, can be suppressed simultaneously. <P>SOLUTION: In the liquid crystal display provided with the liquid crystal display panel 21 and an illuminating means 22 for illuminating the liquid crystal display panel, the illuminating means 22 has a first light-emitting element group 23 having first light-emitting parts 51a and 53a that emit green color light G1; and a second light-emitting element group 24, having second light-emitting parts 61a and 63a emitting red color light R1 and a dichroic mirror 29 transmitting the green color light G1 and reflecting the red color light R1 and the first light-emitting parts 51a and 53a are provided closely, in parallel with each other so as to form an inclined state and the second light-emitting parts 61a and 63a are closely provided in parallel with each other so as to form an inclined state so that the transmission light region of the green color light G1 and of the reflecting light area of the red color light R1 substantially coincides with one another. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device having a liquid crystal display panel and different types of light emitting element groups for illuminating the liquid crystal display panel.

  Conventionally, this type of liquid crystal display device is known to be used in a head-up display device that displays a virtual image by reflecting a display image emitted from a liquid crystal display panel, for example (see, for example, Patent Document 1 below). ). In the head-up display device described in Patent Document 1, the display image projected by the liquid crystal display device disposed on a dashboard of a vehicle is reflected by a windshield of the vehicle toward an observer (driver). The virtual image is displayed.

  The liquid crystal display device includes a liquid crystal display panel and illumination means for illuminating the liquid crystal display panel, and the illumination means emits green light (green light emitting element group) that emits green light and red LED that emits red light. A group (red light emitting element group), a transmissive reflecting member made of, for example, a dichroic mirror that transmits the green light and reflects the red light, and a convex disposed between the transmissive reflecting member and the green LED group A first condensing lens having a convex shape, a convex second condensing lens disposed between the transmission / reflection member and the red LED group, a first wiring board on which the green LED group is mounted, And a second wiring board on which the red LED group is mounted.

In this case, the transmitting / reflecting member is disposed in a traveling direction side of the red light and the green light, and is inclined in a position where the red light and the green light intersect. According to such a configuration, each of the green light emitted from the green LED group and each of the red light emitted from the red LED group is condensed through the respective condenser lenses and the transmissive reflecting member. The colors are mixed and transmitted to the liquid crystal display panel side as individual orange light, whereby the liquid crystal display panel is transmitted and illuminated with the individual orange light.
JP 2003-295105 A

  Here, when attention is paid to the green LED group mounted on the first wiring board, the green LED group 100 is composed of a chip-type light emitting diode, and generally has a first wiring as shown in FIG. A configuration in which the substrate 110 is mounted on the substrate 110 in a matrix is employed. For example, FIG. 6 shows a simplified configuration in which a pair of green LEDs are mounted in two rows at a high density. That is, the green LED group 100 includes four green LEDs 101 to 104, and the light emitting units 101a and 102a are respectively disposed on the first vertical line A1, the first and second green LEDs 101 and 102, and the light emitting unit. 103a and 104a include third and fourth green LEDs 103 and 104, respectively, located on the second vertical line A2.

  Further, each of the green LEDs 101 to 104 includes a square light emitting part 101a to 104a that emits green light, a substantially box-shaped main body part 101b to 104b that accommodates each light emitting part 101a to 104a, and each light emitting part 101a to 104a. The pair of electrode terminals (electrode portions) 101c to 104c that extend to the outer peripheral sides of the main body portions 101b to 104b and are electrically connected to the light emitting portions 101a to 104a, respectively.

  The light emitting portion 103a in the third green LED 103 is connected to the line connecting the light emitting portion 101a and the pair of electrode terminals 101c in the first green LED 101, that is, the horizontal line (horizontal line) B1 orthogonal to the vertical line A1. A pair of electrode terminals 103c is located, and similarly, a fourth green LED 104 on a line connecting the light emitting portion 102a and the pair of electrode terminals 102c in the second green LED 102, that is, an extension of the horizontal line B2 orthogonal to the vertical line A2. The light emitting portion 104a and the pair of electrode terminals 104c in FIG.

  On the other hand, when attention is paid to the red LED group mounted on the second wiring board, the red LED group 200 is also formed on the second wiring board 210 as shown in FIG. For example, FIG. 7 shows a configuration in which a pair of red LEDs are mounted in two rows at a high density, consisting of chip type light emitting diodes arranged in a matrix. That is, the red LED group 200 includes four red LEDs 201 to 204, and the light emitting units 201a and 202a are respectively disposed on the first vertical line C1, and the first and second red LEDs 201 and 202 and the light emitting unit. 203a and 204a are provided with the third and fourth red LEDs 203 and 204 respectively located on the second vertical line C2.

  Further, each of the red LEDs 201 to 204 includes a square light emitting portion 201a to 204a that emits red light, a substantially box-shaped main body portion 201b to 204b that accommodates each light emitting portion 201a to 204a, and each light emitting portion 201a to 204a. It is mainly comprised from a pair of electrode terminal (electrode part) 201c-204c extended on the outer peripheral side of each main-body part 201b-204b and electrically connected with each light emission part 201a-204a.

  In addition, each said red light emitted from each red LED 201-204 condensed by the said 2nd condensing lens and reflected by the said permeation | transmission reflection member is similarly condensed by the said 1st condensing lens. The green light emitted from the green LEDs 101 to 104 that pass through the transmissive reflecting member is mixed with the green light on the transmissive reflecting member. For example, taking the red LED 201 as an example, the red LED 201 and the green LED 101 corresponding to the red LED 201 are mixed on the transmission / reflection member. Similarly, the red LED 202 and the green LED 102, the red LED 203 and the green LED 103, and the red LED 204 and the green LED 104 are mixed on the transmission / reflection member.

  The light emitting portion 203a in the third red LED 203 is connected to the line connecting the light emitting portion 201a in the first red LED 201 and the pair of electrode terminals 201c, that is, the extended line of the horizontal line (horizontal line) D1 orthogonal to the vertical line C1. The pair of electrode terminals 203c is located, and similarly, the fourth red LED 204 is on the line connecting the light emitting portion 202a and the pair of electrode terminals 202c in the second red LED 202, that is, the extended line of the horizontal line D2 orthogonal to the vertical line C2. The light-emitting portion 204a and the pair of electrode terminals 204c in FIG.

  By the way, in the case of the mounting structure of the LED group described above on a single wiring board, one electrode terminal out of a pair of electrode terminals provided in a predetermined LED and the other adjacent to the left or right adjacent to the predetermined LED. It is necessary to mount the LED group on the single wiring board by separating the electrodes (electrode terminals adjacent to each other) by a predetermined distance so that they are not electrically connected to each other. is there.

  Specifically, in FIG. 6, the electrode terminal 101c (electrode terminal E1) located on the right side of the first green LED 101 and the electrode terminal 103c (electrode terminal F1) located on the left side of the third green LED 103 are electrically connected. Therefore, it is necessary to mount the green LEDs 101 and 103 on the first wiring board 110 by separating the two (electrode terminal E1 and electrode terminal F1) by a predetermined distance so that they are not connected to each other. Also in the other green LEDs 102 and 104, the electrode terminal 102c located on the right side of the green LED 102 and the electrode terminal 104c located on the left side of the fourth green LED 104 are not connected to each other.

  Further, even when the above-described red LED groups 201 to 204 are mounted on the second wiring board 210, predetermined adjacent electrode terminals are similarly separated from each other. Specifically, in FIG. 7, an electrode terminal 201c (electrode terminal E2) located on the right side of the first red LED 201 and an electrode terminal 203c (electrode terminal F2) located on the left side of the third red LED 203 are electrically connected. Therefore, it is necessary to mount the red LEDs 201 and 203 on the second wiring board 210 by separating the two (electrode terminal E2 and electrode terminal F2) by a predetermined distance so that they are not connected to each other. In the other red LEDs 202 and 204, the electrode terminal 202c located on the right side of the red LED 202 and the electrode terminal 204c located on the left side of the fourth red LED 204 are not connected to each other.

  According to such a configuration, the transmitted light region of the green LED groups 101 to 104 that is condensed by the first condenser lens and transmitted through the transmission and reflection member, and the second condenser lens is condensed. In addition, the reflected light regions of the red LED groups 201 to 204 reflected by the transmissive reflecting member are both substantially circular (this circular shape is slightly wider than the shape of the light emitting part by passing through the condenser lens). Therefore, the orange light that is mixed with green and red and travels toward the liquid crystal display panel is transmitted through the liquid crystal display panel in a state in which the color unevenness is suppressed. Become.

  However, the first green LED 101 and the third green LED 103 in the green LED groups 101 to 104, the second green LED 102 and the fourth green LED 104, and the first red LED 201 and the third green LED in the red LED groups 201 to 204, respectively. As described above, the red LED 203 and the second red LED 202 and the fourth red LED 204 need to separate the electrode terminals adjacent to each other by a predetermined distance between the two LEDs.

  Therefore, the interval (pitch) between the light emitting portions of the LEDs, for example, when focusing on the first green LED 101 and the third green LED 103, the interval between the light emitting portion 101a and the light emitting portion 103a (reference numeral T1 in FIG. 6), In the case where attention is paid to the first red LED 201 and the third red LED 203, the interval between the light emitting part 201a and the light emitting part 203a (reference numeral T2 in FIG. 6) must be set as wide as the electrode part is formed. You won't get.

As the light emitting unit interval is set wide in this way, a mixed color is formed by the green LED 101 and the red LED 201 in FIG. 8 showing the light emission state of the liquid crystal display panel 300 (that is, the irradiation range of the orange light). A substantially boundary portion S3 between the orange light region (light irradiation region) S1 and the green LED 103 and the orange light region S2 formed by the red LED 203, and the orange light region S4 and the green LED 104 formed by the green LED 102 and the red LED 202. The substantially boundary portion S6 with the orange light region S5 formed by the red LED 204 in a mixed color tends to be darkened, and thereby the luminance unevenness of the orange light transmitted through the liquid crystal display panel 300 in each of the boundary portions S3 and S6. It had the problem of occurring.
Accordingly, an object of the present invention is to provide a liquid crystal display device capable of simultaneously suppressing color unevenness and luminance unevenness of light transmitted through a liquid crystal display panel in order to cope with the above-described problems.

  The present invention includes a liquid crystal display panel and an illuminating unit that illuminates the liquid crystal display panel, and the illuminating unit includes a first light emitting element group having a first light emitting unit that emits first colored light, and a first light emitting element group. A second light-emitting element group having a second light-emitting portion that emits two colored lights, and a transmissive reflecting member that transmits the first colored light and reflects the second colored light, The first colored light transmitted light region formed by transmitting through the reflecting member overlaps the second colored light reflected light region formed by reflecting by the transmitting and reflecting member. The first light emitting units are arranged adjacent to each other so that adjacent first light emitting units are inclined, and the second light emitting units are adjacent second light emitting units. It is characterized by being juxtaposed in close proximity so that they are inclined. To.

  According to the present invention, the first light emitting element group is mounted on a first wiring board, and the second light emitting element group is mounted on a second wiring board different from the first wiring board. It is characterized by being made.

  According to the present invention, an angle formed by a line connecting a pair of first electrode portions provided in the first light emitting element and a line connecting the adjacent first light emitting portions is an acute angle, and An angle formed by a line connecting a pair of second electrode portions provided in the second light emitting element and a line connecting the adjacent second light emitting portions is an acute angle.

  ADVANTAGE OF THE INVENTION According to this invention, the liquid crystal display device which can achieve an initial objective and can suppress the color nonuniformity of the light which permeate | transmits a liquid crystal display panel, and luminance nonuniformity simultaneously can be provided.

  Hereinafter, an embodiment in which the embodiment of the present invention is applied to a head-up display for a vehicle that displays various information such as a vehicle speed and an engine speed will be described as an example with reference to the accompanying drawings.

  The head-up display 10 is disposed in the dashboard 12 of the vehicle 11 (see FIG. 1). The display light L projected by the head-up display 10 is reflected by the windshield 13 toward the viewer 14 side. The observer 14 can visually recognize the virtual image V superimposed on the landscape.

  The head-up display 10 includes a liquid crystal display device 20, a reflector 30 and the like housed in a housing 40 (see FIG. 2). The liquid crystal display device 20 includes a liquid crystal display panel 21 and illumination means 22 that illuminates the liquid crystal display panel 21 (see FIG. 3).

  The liquid crystal display panel 21 is composed of, for example, a TFT (thin film transistor) type liquid crystal display element in which polarizing films are provided on the front and back surfaces of a liquid crystal cell in which liquid crystal is sealed in a pair of translucent substrates. The liquid crystal display panel 21 drives an operation circuit (not shown) for measuring the vehicle speed and the engine speed based on output signals from a vehicle speed sensor and an engine rotation sensor provided in the vehicle 11 and the liquid crystal based on the calculation result. A measured value of the speed of the vehicle 11 or the engine speed can be displayed as a numerical value by a liquid crystal drive circuit (not shown). The display information displayed by the liquid crystal display panel 21 is not limited to the vehicle speed and the engine speed, and may be travel distance information, navigation information, and outside air temperature information, for example.

  On the other hand, the illumination unit 22 includes a first light emitting element group 23, a second light emitting element group 24, a first wiring board 25, a second wiring board 26, a first condenser lens 27, A second condenser lens 28 and a dichroic mirror (transmission / reflection member) 29 are provided.

  FIG. 4 shows the first light emitting element group 23 (first wiring) when the first light emitting element group 23 (first wiring board 25) is viewed from the dichroic mirror 29 side (in the direction of arrow Z1 in FIG. 3). It is a front view of the board | substrate 25). The right side surface M1 of the first wiring board 25 in FIG. 4 corresponds to the surface N1 of the first wiring board 25 in FIG. 3, and the upper side surface M2 of the first wiring board 25 in FIG. 3 corresponds to the surface N2 of the first wiring board 25 in FIG. 3, and the lower surface M3 of the first wiring board 25 in FIG. 4 corresponds to the surface N3 of the first wiring board 25 in FIG.

  In this case, the first light emitting element group 23 is composed of four chip type light emitting diodes that are aligned and mounted on the first wiring board 25 in close proximity to each other. A first light emitting element 23a located in the region, a second light emitting element 23b disposed immediately below the first light emitting element 23a, and a third light emitting element disposed on the right side of the first light emitting element 23a. 23c, and a fourth light emitting element 23d arranged on the right side of the second light emitting element 23b.

  The first light emitting element 23a houses a first light emitting portion 51a that emits green light G1, which is first colored light, and the first light emitting portion 51a, and the outer shape is made of a resin having a substantially frame shape. 1 main body portion 51b and the first light emitting portion 51a across the outer periphery side of the first main body portion 51b, and are connected to the first light emitting portion 51a through wire bonding (not shown). A pair of first electrode portions 51c and a first light emitting portion 51a are disposed on the bottom of the first main body portion 51b so as to place the heat from the first light emitting portion 51a on the first wiring board. And a first heat radiating portion 51d for escaping to the 25 side.

  Since the configuration of the other light emitting elements 23b to 23d is exactly the same as the configuration of the first light emitting element 23a, detailed description thereof will be omitted. However, for the sake of explanation, the reference numerals of the respective parts are different for each light emitting element. That is, the second light emitting element 23b includes a first light emitting part 52a, a first main body part 52b, a first electrode part 52c, and a first heat radiating part 52d, and the third light emitting element 23c includes 1 light-emitting part 53a, the 1st main-body part 53b, the 1st electrode part 53c, and the 1st thermal radiation part 53d, and the 4th light-emitting element 23d is the 1st light-emitting part 54a and the 1st main-body part. 54b, the 1st electrode part 54c, and the 1st thermal radiation part 54d shall be provided.

  In the present embodiment, a horizontal line (line) X1 connecting the first light emitting part 51a in the first light emitting element 23a and the first light emitting part 53a in the third light emitting element 23c is the first light emitting element. The first and third light emitting elements cross the line X2 connecting the pair of first electrode parts 51c in 23a and the line X3 connecting the pair of first electrode parts 53c in the third light emitting element 23c. 23 a and 23 c are mounted on the first wiring board 25.

  Similarly, for the second and fourth light emitting elements 23b and 23d, a horizontal line connecting the first light emitting part 52a in the second light emitting element 23b and the first light emitting part 54a in the fourth light emitting element 23d ( Line X4 intersects with a line X5 connecting the pair of first electrode portions 52c in the second light emitting element 23b and a line X6 connecting the pair of first electrode portions 54c in the fourth light emitting element 23d. The second and fourth light emitting elements 23b and 23d are mounted on the first wiring board 25 together with the first and third light emitting elements 23a and 23c.

  In the present embodiment, the angle K1 at which the horizontal line X1 and the line X2 intersect is approximately 60 degrees. This means that when the line X2 is rotated approximately 60 degrees counterclockwise about the first light emitting portion 51a in the first light emitting element 23a, the line X2 substantially coincides with the horizontal line X1. is doing.

  Needless to say, the other horizontal lines X1 and X3, the horizontal lines X4 and X5, and the horizontal lines X4 and X6 are also in the same positional relationship as that of the horizontal lines X1 and X2.

  That is, when the line X3 is rotated approximately 60 degrees counterclockwise about the first light emitting portion 53a in the third light emitting element 23c, the line X3 substantially coincides with the horizontal line X1, and the second light emission When the line X5 is rotated approximately 60 degrees counterclockwise around the first light emitting portion 52a in the element 23b, the line X5 substantially coincides with the horizontal line X4, and the first light emitting element 23d in the fourth light emitting element 23d The line X6 substantially coincides with the horizontal line X4 when the line X6 is rotated approximately 60 degrees counterclockwise around the light emitting portion 54a.

  By adopting such a configuration, the first main body 51b of the first light-emitting element 23a and the first main-body part 53b of the third light-emitting element 23c can be brought closer to each other than before. In addition, the first main body portion 52b of the second light emitting element 23b and the first main body portion 54b of the fourth light emitting element 23d can be brought closer to each other as compared with the related art. In other words, compared to the conventional case where all the electrode portions are positioned on the horizontal line, in the present embodiment, the pair of electrode portions 51c, 52c, 53c, and 54c are positioned on the horizontal lines X1 and X4. In addition, the first light emitting element 23a and the third light emitting element 23c, or the second light emitting element are arranged by tilting the pair of electrode portions 51c, 52c, 53c, and 54c at positions off the horizontal lines X1 and X4. The element 23b and the fourth light emitting element 23d are mounted closer to each other on the first wiring board 25.

  Accordingly, when the first wiring board 25 is viewed from the front as shown in FIG. 4, the distance between the pair of light emitting units adjacent to the left side or the right side on the first wiring board 25 (that is, the first wiring board 25). The interval between the light emitting unit 51a and the first light emitting unit 53a and the interval between the first light emitting unit 52a and the first light emitting unit 54a) can be set narrower than in the past. This means that the width dimension of the symbol T3 in FIG. 4 is set narrower than the width dimension of the symbol T1 in FIG.

  Note that the first light emitting element 23a is inclined at a predetermined angle with respect to the horizontal line X1 as described above, when the first light emitting unit 51a looks at the first wiring board 25 from the front. Needless to say, the shape is not a substantially square shape but a substantially rhombus shape. The same applies to the other light emitting elements 23b to 23d. That is, the first light emitting portions 52a, 53a, and 54a are not substantially square-shaped when the first wiring board 25 is viewed from the front, and are substantially the same. It has a rhombus shape.

  Therefore, when attention is paid to the first and third light emitting elements 23a and 23c, the first light emitting portions 51a and 53a are in a state in which these (adjacent first light emitting portions 51a and 53a) are inclined together. When the second and fourth light emitting elements 23b and 23d are focused on, the first light emitting units 52a and 54a are connected to these (adjacent first light emitting units 52a and 54a). Are arranged close to each other so as to form an inclined state.

  5 shows the second light emitting element group 24 (second wiring) when the second light emitting element group 24 (second wiring board 26) is viewed from the dichroic mirror 29 side (in the direction of arrow Z2 in FIG. 3). It is a front view of the board | substrate 26). Note that the right side surface M4 of the second wiring board 26 in FIG. 5 corresponds to the surface N4 of the second wiring board 26 in FIG. 3, and the upper side surface M5 of the second wiring board 26 in FIG. 3 corresponds to the surface N5 of the second wiring board 26 in FIG. 3, and the lower surface M6 of the second wiring board 26 in FIG. 5 corresponds to the surface N6 of the second wiring board 26 in FIG.

  As shown in FIG. 5, the second light emitting element group 24 is composed of four chip-type light emitting diodes that are aligned and mounted on the second wiring board 26 in close proximity to each other. A fifth light emitting element 24a located in the upper right region of the second light emitting element 26, a sixth light emitting element 24b disposed immediately below the fifth light emitting element 24a, and a seventh light emitting element disposed on the left side of the fifth light emitting element 24a. Light emitting element 24c and an eighth light emitting element 24d disposed on the left side of the sixth light emitting element 24b.

  The fifth light emitting element 24a accommodates the second light emitting portion 61a that emits the red light R1 that is the second colored light, and the second light emitting portion 61a, and the outer shape is made of a resin having a substantially frame shape. The second main body portion 61b extends to the outer peripheral side of the second main body portion 61b with the second light emitting portion 61a interposed therebetween, and is electrically connected to the second light emitting portion 61a via wire bonding (not shown). A pair of second electrode parts 61c and a second light emitting part 61a are disposed at the bottom of the second main body part 61b so as to place the heat from the second light emitting part 61a on the second wiring board. And a second heat radiating portion 61d for escaping to the 26th side.

  Since the configuration of the other light emitting elements 24b to 24d is exactly the same as the configuration of the fifth light emitting element 24a, detailed description thereof will be omitted, but for the sake of explanation, the reference numerals of the respective parts are different for each light emitting element. That is, the sixth light emitting element 24b includes a second light emitting part 62a, a second main body part 62b, a second electrode part 62c, and a second heat radiating part 62d, and the seventh light emitting element 24c includes The second light emitting portion 63a, the second main body portion 63b, the second electrode portion 63c, and the second heat radiating portion 63d, and the eighth light emitting element 24d includes the second light emitting portion 64a and the second main body portion. 64b, the 2nd electrode part 64c, and the 2nd thermal radiation part 64d shall be provided.

  In the present embodiment, the horizontal line (line) Y1 connecting the second light emitting part 61a in the fifth light emitting element 24a and the second light emitting part 63a in the seventh light emitting element 24c is the fifth light emitting element. The fifth and seventh light emitting elements intersect the line Y2 connecting the pair of second electrode parts 61c in 24a and the line Y3 connecting the pair of second electrode parts 63c in the seventh light emitting element 24c. 24 a and 24 c are mounted on the second wiring board 26.

  Similarly, for the sixth and eighth light emitting elements 24b and 24d, a horizontal line connecting the second light emitting part 62a in the sixth light emitting element 24b and the second light emitting part 64a in the eighth light emitting element 24d ( Line Y4 intersects line Y5 connecting the pair of second electrode portions 62c in the sixth light emitting element 24b and line Y6 connecting the pair of first electrode portions 64c in the eighth light emitting element 24d. The sixth and eighth light emitting elements 24b and 24d are mounted on the second wiring board 26 together with the fifth and seventh light emitting elements 24a and 24c.

  In the present embodiment, the angle K2 at which the horizontal line Y1 and the line Y2 intersect is approximately 60 degrees. This means that the line Y2 substantially coincides with the horizontal line Y1 when the line Y2 is rotated approximately 60 degrees clockwise around the second light emitting portion 61a in the fifth light emitting element 24a. ing.

  It goes without saying that the other horizontal lines Y1 and Y3, the horizontal lines Y4 and Y5, and the horizontal lines Y4 and Y6 are also in the same positional relationship as that of the horizontal lines Y1 and Y2.

  That is, when the line Y3 is rotated approximately 60 degrees clockwise around the second light emitting portion 63a in the seventh light emitting element 24c, the line Y3 substantially coincides with the horizontal line Y1, and the sixth light emitting element The line Y5 substantially coincides with the horizontal line Y4 when the line Y5 is rotated approximately 60 degrees clockwise around the second light emitting part 62a in 24b, and the second light emitting part in the eighth light emitting element 24d. The line Y6 substantially coincides with the horizontal line Y4 when the line Y6 is rotated approximately 60 degrees clockwise around 64a.

  By adopting such a configuration, the second main body portion 61b of the fifth light emitting element 24a and the second main body portion 63b of the seventh light emitting element 24c can be brought closer to each other compared to the conventional case. In addition, the second main body portion 62b of the sixth light emitting element 24b and the second main body portion 64b of the eighth light emitting element 24d can be brought closer to each other as compared with the related art. In other words, compared to the conventional case where all the electrode portions are positioned on the horizontal line, in the present embodiment, the pair of electrode portions 61c, 62c, 63c, and 64c are positioned on the horizontal lines Y1 and Y4. In addition, the fifth light emitting element 24a, the seventh light emitting element 24c, and the sixth light emitting element are disposed by incliningly arranging the pair of electrode portions 61c, 62c, 63c, 64c away from the horizontal lines Y1, Y4. The element 24b and the eighth light emitting element 24d are mounted closer to each other on the second wiring board 26.

  Accordingly, when the second wiring board 26 is viewed from the front as shown in FIG. 5, the distance between the pair of light emitting units adjacent to the left side or the right side on the second wiring board 26 (that is, the second wiring board 26). The distance between the light emitting part 61a and the second light emitting part 63a and the distance between the second light emitting part 62a and the second light emitting part 64a) can be set narrower than in the prior art. This means that the width dimension of the symbol T4 in FIG. 5 is set narrower than the width dimension of the symbol T2 in FIG. 5 is the same as the width dimension of the symbol T3 in FIG. 4, and the interval between the line Y1 and the line Y4 in FIG. 5 is the same as the line X1 in FIG. It is the same as the interval of the line X4. This means that in each of the light emitting element groups 23 and 24, the distances between the light emitting portions adjacent in the vertical and horizontal directions are all equal.

  Note that the fifth light emitting element 24a is inclined at a predetermined angle with respect to the horizontal line Y1 as described above, when the second light emitting unit 61a views the second wiring board 26 from the front. Needless to say, the shape is not a substantially square shape but a substantially rhombus shape. The same applies to the other light emitting elements 24b to 24d. That is, the second light emitting portions 62a, 63a, and 64a are not substantially square-shaped when the second wiring board 26 is viewed from the front, and are substantially the same. It has a rhombus shape.

  Accordingly, when focusing on the fifth and seventh light emitting elements 24a and 24c, the second light emitting portions 61a and 63a are in a state in which these (the adjacent first light emitting portions 61a and 63a) are both inclined. In the case where the sixth and eighth light emitting elements 24b and 24d are focused, the second light emitting units 62a and 64a are connected to these (adjacent first light emitting units 62a and 64a). Are arranged close to each other so as to form an inclined state.

  The first wiring board 25 is made of, for example, a substantially rectangular aluminum substrate having high thermal conductivity, and is mounted (mounted) with at least first electronic components such as the light emitting elements 23a to 23d. A first wiring portion (not shown) for supplying power to the component is provided.

  The second wiring board 26 is made of, for example, a substantially rectangular aluminum substrate with high thermal conductivity, and is mounted (mounted) with at least second electronic components such as the light emitting elements 24a to 24d. A second wiring part (not shown) for supplying power to the component is provided. The outer shape of the second wiring board 26 is substantially the same as the outer shape of the first wiring board 25.

  The first condenser lens 27 is made of a translucent synthetic resin, and protrudes toward the dichroic mirror 29 corresponding to the individual light emitting elements 23a to 23d of the first light emitting element group 23 as shown in FIG. The spherical surface 27a has a function of condensing illumination light emitted from the light emitting elements 23a to 23d. Then, the condensed illumination light (each green light G1) of each of the light emitting elements 23a to 23d is guided to the dichroic mirror 29 side.

  The second condenser lens 28 is made of a translucent synthetic resin, and includes a plurality of convex spherical surfaces 28 a that protrude toward the dichroic mirror 29 corresponding to the individual light emitting elements 24 a to 24 d of the second light emitting element group 24. The spherical surface 28a is formed and has a function of condensing illumination light emitted from each of the light emitting elements 24a to 24d. And the condensed illumination light (each red light R1) of each light emitting element 24a-24d is guide | induced to the dichroic mirror 29 side similarly to each green light G1. In addition, the shape of the 2nd condensing lens 28 (each spherical surface 28a) shall be the same as the shape of the 1st condensing lens 27 (each spherical surface 27a).

  The dichroic mirror 29 includes a glass substrate 29a and a reflective film 29b formed by vapor deposition on the front surface of the glass substrate 29 (that is, the surface facing the back surface of the liquid crystal display panel 21). Inclinedly arranged so as to have an inclination of approximately 45 degrees with respect to the direction and the traveling direction of each red light R1.

  The dichroic mirror 29 transmits the green light G1 emitted from the first light emitting element group 23 and reflects the red light R1 emitted from the second light emitting element group 24. The green light G1 transmitted through the dichroic mirror 29 and the red light R1 reflected through the dichroic mirror 29 are mixed with each other by the dichroic mirror 29, and the mixed illumination lights (each orange light) L1 are mixed. By being led to the liquid crystal display panel 21 side, the liquid crystal display panel 21 is transmitted and illuminated.

  At this time, on the dichroic mirror 29, the green light G1 emitted from the light emitting portions 51a, 52a, 53a, 54a in the light emitting elements 23a-23d and the light emitting portions 61a, 62a, 63a in the light emitting elements 24a-24d. , 64a and the red light R1 are individually mixed to become orange light L1. In other words, from the green light G1 emitted from the first light emitting part 51a and the red light R1 emitted from the second light emitting part 61a, from the green light G1 emitted from the first light emitting part 52a and from the second light emitting part 62a. Red light R1 emitted, green light G1 emitted from the first light emitting portion 53a and red light R1 emitted from the second light emitting portion 63a, and green light G1 emitted from the first light emitting portion 54a and the second light emission. The red light R1 emitted from the part 64a is mixed with each other.

  By the way, in this embodiment, the 1st light emission part 51a in the 1st light emitting element 23a and the 2nd light emission part 61a in the 5th light emitting element 24a are with respect to the reference plane P in which the reflective film 29b is formed. It is mounted on each wiring board 25, 26 in an inclined state so as to have a plane-symmetrical positional relationship. Note that the first light emitting unit 52a and the sixth light emitting element 24b in the second light emitting element 23b, the second light emitting unit 62a in the sixth light emitting element 24b, and the first light emitting unit 53a and the seventh light emitting element 24c in the third light emitting element 23c. Similarly, the second light-emitting portion 63a of the first light-emitting portion 54a and the first light-emitting portion 54a of the fourth light-emitting element 23d and the second light-emitting portion 64a of the eighth light-emitting element 24d are also symmetrical with respect to the reference plane P. Needless to say, they are in a positional relationship.

  Therefore, for example, when attention is paid to the first light emitting element 23a and the fifth light emitting element 24a, the light is emitted from the first light emitting portion 51a of the first light emitting element 23a and condensed by the first condenser lens 27. In addition, the green light G1 transmitted light region formed by passing through the dichroic mirror 29 and the second light emitting portion 61a of the fifth light emitting element 24a are emitted and condensed by the second condenser lens 28. In addition, the reflected light region of the red light R1 formed by being reflected by the dichroic mirror 29 substantially coincides (overlaps) when emitted from the dichroic mirror 29, and as a result, color unevenness is suppressed. The orange light L <b> 1 is guided to the liquid crystal display panel 21. That is, this assumes that the light-emitting area of the first light-emitting portion 51 a and the light-emitting area of the second light-emitting portion 61 a are assumed to be the dichroic mirror 29 when it is assumed that the condenser lenses 27 and 28 are not provided. This means that they are exactly the same. Similarly, the first light emitting unit 52a and the second light emitting unit 62a, the first light emitting unit 53a and the second light emitting unit 63a, and the first light emitting unit 54a and the second light emitting unit 64a are similarly colored uneven. The suppressed orange light L1 is guided to the liquid crystal display panel 21.

  Moreover, in the present embodiment, the first light emitting unit 51a and the second light emitting unit 61a, the first light emitting unit 52a and the second light emitting unit 62a, the first light emitting unit 53a and the second light emitting unit 63a, and As the distance (pitch) between the first light emitting part 54a and the second light emitting part 64a is set narrower as described above, the first light emitting part 51a and the second light emitting part 61a are formed. The amount of light guided to the boundary between the orange light region (light irradiation region) and the orange light region formed by the first light emitting unit 53a and the second light emitting unit 63a is increased. The problem that the boundary portion is likely to be darkened is eliminated, whereby not only the color unevenness of the orange light L1 transmitted through the liquid crystal display panel 21 but also the brightness unevenness can be suppressed. A boundary region between the orange light region formed by the first light emitting unit 52a and the second light emitting unit 62a and the orange light region formed by the first light emitting unit 54a and the second light emitting unit 64a. Needless to say, not only the color unevenness but also the brightness unevenness is suppressed.

  Then, the orange light L1 transmitted through the liquid crystal display panel 21 and irradiated (emitted) from the liquid crystal display panel 21 in a state in which color unevenness and luminance unevenness are suppressed is emitted from the liquid crystal display device 20 as display light L and reflected. It is the structure led to the container 30 side.

  As shown in FIG. 2, the reflector 30 includes a concave mirror 31, a holding member 32, and a stepping motor 33. The concave mirror 31 is formed by depositing a metal (for example, aluminum) on a resin (for example, polycarbonate) to form a reflective surface 31a. The reflection surface 31a is a concave surface, and the display light L emitted from the liquid crystal display device 20 is enlarged to display the virtual image V. The concave mirror 31 is bonded to the holding member 32 with a double-sided adhesive tape. The holding member 32 is made of resin (for example, ABS), and the gear portion 34 and the shaft portion 35 are integrally formed. The shaft portion 35 of the holding member 32 is pivotally supported by the housing 40.

  A gear 36 is attached to the rotation shaft of the stepping motor 33, and the gear 36 is engaged with the gear portion 34 of the holding member 32. The concave mirror 31 is supported in a rotatable state together with the holding member 32, and the concave mirror 31 can be rotated by the stepping motor 33 to adjust the projection direction of the display light L. The observer 14 operates a push button switch (not shown) to adjust the angle of the concave mirror 31 so that the display light L is reflected at the position of the eyes (that is, the virtual image V can be visually recognized).

  The housing 40 accommodates the liquid crystal display device 20 and the reflector 30. The housing 40 is provided with a window 41 from which the display light L is emitted. This window part 41 consists of translucent resin (for example, acrylic), and has a curved shape. Further, the housing 40 is provided with a light shielding wall 42 to prevent a phenomenon (washout) in which external light such as sunlight enters the liquid crystal display device 20 and the virtual image V becomes difficult to see. The light shielding wall 42 has a flat plate shape and is formed so as to hang obliquely from the upper part of the housing 40.

  As described above, in the present embodiment, the liquid crystal display panel 21 and the illumination unit 22 that illuminates the liquid crystal display panel are provided, and the illumination unit 22 emits the green light G1 to the first light emitting units 51a, 52a, 53a, and 54a. A first light emitting element group 23 having a second light emitting section 61a, 62a, 63a, 64a that emits red light R1, a green light G1 and a red light R1. The first light emitting portions 51a, 52a, 53a, 54a are adjacent to each other so that the transmitted light region of the green light G1 and the reflected light region of the red light R1 substantially coincide with each other. The first light emitting units 51a, 53a to be adjacent to each other or the adjacent first light emitting units 52a, 54a are arranged close to each other so as to be inclined and the second light emitting units 61a, 62a are arranged side by side. The liquid crystal display panel is formed by arranging 63a and 64a adjacent to each other so that the adjacent second light emitting portions 61a and 63a or the adjacent second light emitting portions 62a and 64a are inclined. The color unevenness and the brightness unevenness of the light (orange light L1) transmitted through 21 can be suppressed at the same time.

  In the present embodiment, the four light emitting elements 23a to 23d or the four light emitting elements 24a to 24d are densely arranged in a matrix on the single first wiring board 25 or the single second wiring board 26. Although the case where it is mounted has been described, for example, a configuration in which two or more light-emitting elements arranged in a row are mounted at a high density on a single wiring board, or two pieces arranged in a row may be used. A plurality of sets of the above light-emitting elements may be provided, and the plurality of sets of light-emitting elements may be mounted on a single wiring board with high density.

  In this embodiment, the angle K1 formed by the horizontal lines X1 and X2 (X3), the horizontal lines X4 and X5 (X6) is 60 degrees, and the horizontal lines Y1 and Y2 (Y3) and the horizontal lines Y4 and The case where the angle K2 formed by the line Y5 (Y6) is 60 degrees equal to the angle K1 has been described. However, if the angles K1 and K2 are both the same angle, any angle (in this case, greater than 0 degrees) An angle less than 90 degrees (that is, an acute angle) can be employed. For example, both the angles K1 and K2 may be set to 30 degrees or 75 degrees.

  In particular, when the angle K1 is set to about 135 degrees and the angle K2 is set to about 45 degrees, or conversely, the angle K1 is set to about 45 degrees and the angle K2 is set to about 135 degrees, the same effect as the present embodiment. Can be obtained. In this case, since the first wiring part provided in the first wiring board 25 and the second wiring part provided in the second wiring board 26 can be made common, the wiring part is applied to the aluminum substrate as a base material. Only one type of wiring board is produced instead of two types as in this embodiment. Therefore, it is possible to reduce the manufacturing cost of the wiring board (cost required for patterning the dedicated wiring part).

It is a general-view figure of the head up display by the embodiment of the present invention. It is sectional drawing of the head-up display by the embodiment. It is a side view of the liquid crystal display device by the same embodiment. It is a front view of the 1st wiring board by the embodiment. It is a front view of the 2nd wiring board by the embodiment. It is a front view of the wiring board by a prior art. It is a front view of the other wiring board by a prior art. It is a figure which shows the light emission state of the liquid crystal display panel by a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 21 Liquid crystal display panel 22 Illumination means 23 1st light emitting element group 24 2nd light emitting element group 25 1st wiring board 26 2nd wiring board 27 1st condensing lens 28 2nd condensing lens 29 Dichroic mirror (Transmission and reflection member)
30 reflector 40 housing 51a, 53a first light emitting part 51c, 53c first electrode part 61a, 63a second light emitting part 61c, 63c second electrode part G1 green light R1 red light L1 orange light

Claims (3)

A liquid crystal display panel; and illumination means for illuminating the liquid crystal display panel,
The illumination means includes: a first light emitting element group having a first light emitting part that emits first colored light; a second light emitting element group having a second light emitting part that emits second colored light; A transmission and reflection member that transmits the first colored light and reflects the second colored light;
The first colored light transmission light region formed by transmitting through the transmission reflection member overlaps the second colored light reflection light region formed by reflection by the transmission reflection member. As described above, the first light emitting units are arranged adjacent to each other so that adjacent first light emitting units are inclined, and the second light emitting units are adjacent to each other. A liquid crystal display device, wherein the light emitting units are arranged in close proximity so as to form an inclined state. The first light emitting element group is mounted on a first wiring board, and the second light emitting element group is mounted on a second wiring board different from the first wiring board. The liquid crystal display device according to claim 1. An angle formed by a line connecting a pair of first electrode parts provided in the first light emitting element and a line connecting the adjacent first light emitting parts is an acute angle, and the second light emitting element The liquid crystal display device according to claim 1, wherein an angle formed between a line connecting the pair of second electrode portions provided in the line and a line connecting the adjacent second light emitting portions is an acute angle.

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