JP2010211065A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress luminance unevenness of transmitted illuminating light from a plurality of light-emitting diodes while preventing the deterioration of luminance thereof in a display device using the plurality of light-emitting diodes as a backlight of a light-receiving display panel. <P>SOLUTION: The display device 1 includes: the light-receiving display panel 2; the plurality of light-emitting diodes 51-54 transmissively lighting the display panel 2; and an integrator lens 3 disposed between the light-emitting diodes 51-54 and the display panel 2 and composed of a plurality of convex lenses 31-36. The relative arrangement of the light-emitting diodes 51-54 and the integrator lens 3 is set so that focal points 300 of the convex lenses 31-36 are located between the light-emitting diodes 51-54 and the integrator lens 3, and the relative arrangement of the display panel 2, the light-emitting diodes 51-54 and the convex lenses 31-36 and the focal length LF of each focal point 300 are set so that the light-emitting diodes 51-54 are imaged by the convex lenses 31-36 as actual images 500 within the display panel 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a display device including a light receiving type display panel and a plurality of light emitting diodes that transmit and illuminate the display panel.

  Conventionally, a display device including a liquid crystal panel as a light receiving display panel and a plurality of light emitting diodes that transmit and illuminate the liquid crystal panel has been put into practical use. In a display device using a plurality of light emitting diodes as a backlight of a liquid crystal panel, a diffusion plate for diffusing the light is disposed between the plurality of light emitting diodes and the liquid crystal panel in order to suppress luminance unevenness of transmitted illumination light from the plurality of light emitting diodes. is doing.

  Further, in a display device in which a halogen lamp is used as a backlight of a liquid crystal panel as a single light source, a display device in which an integrator lens composed of a plurality of convex lenses is arranged between the halogen lamp and the liquid crystal panel is disclosed (Patent Document). 1). In this display device, the light from the halogen lamp is made incident on the integrator lens to be uniform, and the luminance unevenness of the transmitted illumination light from the halogen lamp is suppressed.

Japanese Patent Laid-Open No. 5-104979

  In a display device in which a diffusing plate is arranged between a plurality of light emitting diodes and a liquid crystal panel, it is necessary to improve the light diffusing performance of the diffusing plate in order to suppress uneven brightness of transmitted illumination light from the plurality of light emitting diodes. However, when the light diffusing performance by the diffuser plate is increased, the light from the plurality of light emitting diodes is greatly diffused by the diffuser plate, and the luminance of the transmitted illumination light is lowered. For this reason, in a display device using a plurality of light emitting diodes as a backlight of a light receiving display panel, it is required to suppress luminance unevenness while suppressing a decrease in luminance of transmitted illumination light from the plurality of light emitting diodes.

  On the other hand, in Patent Document 1, how an integrator lens is configured for a display device having a plurality of light-emitting diodes as a backlight can suppress luminance unevenness while suppressing a decrease in luminance of transmitted illumination light. Is not disclosed.

  The present invention has been made in view of such circumstances, and in a display device using a plurality of light emitting diodes as a backlight of a light receiving display panel, the brightness of transmitted illumination light from the plurality of light emitting diodes is reduced. The object is to suppress luminance unevenness while suppressing.

  In order to achieve the above object, the present invention employs the following technical means.

  According to the first aspect of the present invention, the light receiving type display panel, the plurality of light emitting diodes arranged on the rear side of the display panel to transmit and illuminate the display panel, and the plurality of light emitting diodes disposed between the plurality of light emitting diodes and the display panel. And an integrator lens composed of a plurality of convex lenses, and the relative arrangement of the plurality of light emitting diodes and the integrator lens is set so that the focal points of the plurality of convex lenses are arranged between the plurality of light emitting diodes and the integrator lens. The relative arrangement of the display panel, the plurality of light emitting diodes and the plurality of convex lenses, and the focal length of each convex lens are set so that the plurality of light emitting diodes are formed as real images in the display panel by the plurality of convex lenses. It is characterized by.

  According to this configuration, the relative arrangement of the plurality of light emitting diodes and the integrator lens is set so that the focal points of the plurality of convex lenses are arranged between the plurality of light emitting diodes and the integrator lens. The diode forms a real image at a predetermined position by a plurality of convex lenses. Since the light from the light emitting diode is condensed by the convex lens and formed as a real image, a decrease in the luminance of the real image is suppressed with respect to the luminance of the light emitting diode.

  According to this configuration, the relative arrangement of the display panel, the plurality of light emitting diodes, and the plurality of convex lenses, and each convex lens so that a real image of the plurality of light emitting diodes is formed in the display panel by the plurality of convex lenses. The focal length is set. For this reason, the display panel is transmitted and illuminated with the real image formed in the display panel as transmitted illumination light from the plurality of light emitting diodes.

  Therefore, since the decrease in the luminance of the real image formed in the display panel is suppressed with respect to the luminance of the light emitting diode, the decrease in the luminance of transmitted illumination light from the plurality of light emitting diodes can be suppressed.

  Further, the plurality of light emitting diodes are condensed by one convex lens, and are formed into a plurality of real images in principle. For this reason, a plurality of light emitting diodes are condensed by a plurality of convex lenses, and in principle, are formed as a number of real images obtained by multiplying (multiplying) a plurality of light emitting diodes and a plurality of convex lenses. Therefore, the number of real images formed in the display panel can be increased more than the plurality of light emitting diodes. For this reason, the interval between the real images when the number of the real images increased from the plurality of light emitting diodes is made to enter the display panel is narrower than that when the plurality of light emitting diodes are directly incident on the display panel. Therefore, uneven brightness of transmitted illumination light from the plurality of light emitting diodes can be suppressed.

  As a result, it is possible to suppress luminance unevenness while suppressing a decrease in luminance of transmitted illumination light from a plurality of light emitting diodes.

  According to the second aspect of the present invention, the relative arrangement of the plurality of light emitting diodes and the plurality of convex lenses is set so that the real image is enlarged with respect to the light emitting diodes.

  According to this configuration, since the real image of the light emitting diode by the convex lens is enlarged with respect to the light emitting diode, the transmitted illumination light from each light emitting diode is enlarged and the display panel is transmitted and illuminated. For this reason, the brightness nonuniformity of the transmitted illumination light from a plurality of light emitting diodes can be further suppressed. In addition, since the light from the light emitting diode is condensed by the convex lens and formed as a real image, the decrease in the luminance of the real image is suppressed relative to the luminance of the light emitting diode. But the same is true.

  As a result, luminance unevenness can be further suppressed while suppressing a decrease in luminance of transmitted illumination light from a plurality of light emitting diodes.

  According to the third aspect of the invention, the distance between a part of the plurality of light emitting diodes and the display panel is different from the distance between the remaining part of the plurality of light emitting diodes and the display panel. The focal length of a part of the plurality of convex lenses is set to be different from the focal length of the remaining part of the plurality of convex lenses so that a part of the plurality of convex lenses forms an image in the display panel as a real image. It is characterized by.

  According to this configuration, the focal length of some of the convex lenses is such that some of the light emitting diodes arranged so as to have different distances from the display panel are imaged in the display panel as real images by some of the convex lenses. It is set to be different from the focal length of the remaining convex lens. Therefore, even if the distance between the light emitting diode and the display panel is changed, a real image of the light emitting diode can be formed in the display panel without changing the distance between the light emitting diode and the convex lens. That is, even if the arrangement of a part of the display panel is changed with respect to the plurality of light emitting diodes, the plurality of light emitting diodes are connected as real images in the display panel without changing the relative arrangement of the plurality of light emitting diodes and the integrator lens. Can be imaged.

  Therefore, even if the arrangement of a part of the display panel is changed with respect to the plurality of light emitting diodes, the relative arrangement of the plurality of light emitting diodes and the integrator lens is not changed, and the luminance of the transmitted illumination light from the plurality of light emitting diodes is reduced. Luminance unevenness can be suppressed while suppressing a decrease.

  According to a fourth aspect of the present invention, the distances between the plurality of light emitting diodes and the display panel are arranged different from each other, and the focal lengths are set different from each other.

  According to this configuration, even if the distance between the plurality of light emitting diodes and the display panel is different from each other, the relative distance between the plurality of light emitting diodes and the integrator lens is set by setting the focal lengths to be different from each other. A plurality of light emitting diodes can be formed as real images in the display panel without changing the general arrangement.

  Therefore, even if the distance between the plurality of light emitting diodes and the display panel is different from each other, the transmitted light from the plurality of light emitting diodes is not changed without changing the relative arrangement of the plurality of light emitting diodes and the integrator lens. Luminance unevenness can be suppressed while suppressing a decrease in luminance of light.

  According to the fifth aspect of the present invention, the light receiving type display panel, the plurality of light emitting diodes disposed on the rear side of the display panel and transmitting and illuminating the display panel, and the plurality of light emitting diodes disposed between the light emitting diodes and the display panel. A plurality of convex lenses, an integrator lens disposed between the integrator lens and the display panel, and a diffusing member for diffusing light. The diffusing member and the plurality of light emitting diodes are set so that the focal points of the plurality of convex lenses are arranged between the diode and the integrator lens, and the plurality of light emitting diodes are formed as real images in the diffusing member by the plurality of convex lenses. The relative arrangement of a plurality of convex lenses and the focal length of each convex lens are set.

  According to this configuration, the relative arrangement of the plurality of light emitting diodes and the integrator lens is set so that the focal points of the plurality of convex lenses are arranged between the plurality of light emitting diodes and the integrator lens, and the plurality of convex lenses are used. The relative arrangement of the diffusing member, the plurality of light emitting diodes and the plurality of convex lenses, and the focal length of each convex lens are set so that the real images of the plurality of light emitting diodes are formed in the diffusing member. For this reason, since the decrease in the luminance of the real image condensed by the plurality of convex lenses and formed in the diffusing member is suppressed with respect to the luminance of the light emitting diode, the light reaching the diffusing member from the plurality of light emitting diodes is suppressed. A decrease in luminance can be suppressed.

  In addition, since the plurality of light emitting diodes are condensed by the plurality of convex lenses and, in principle, are formed as the number of real images obtained by multiplying the plurality of light emitting diodes and the plurality of convex lenses, the real image formed in the diffusion member. Can be increased from the number of light emitting diodes. For this reason, the interval between the real images when the light is incident on the diffusing member as a larger number of real images than the plurality of light emitting diodes is narrower than that when the plurality of light emitting diodes are directly incident on the diffusing member. Accordingly, it is possible to suppress uneven brightness of light reaching the diffusion member from a plurality of light emitting diodes.

  Therefore, luminance unevenness can be suppressed while suppressing a decrease in luminance of light reaching the diffusion member from a plurality of light emitting diodes. The light that suppresses the luminance unevenness while suppressing the decrease in luminance is diffused by the diffusing member, and the display panel can be transmitted and illuminated as transmitted illumination light while further suppressing the luminance unevenness. Here, since the light in which the luminance unevenness is suppressed while suppressing the decrease in luminance reaches the diffusing member, it is not necessary to excessively suppress the luminance unevenness with the diffusing member. For this reason, since it is not necessary to excessively improve the light diffusing performance by the diffusing member, it is possible to suppress a decrease in luminance of the transmitted illumination light by the diffusing member.

  As a result, it is possible to suppress luminance unevenness while suppressing a decrease in luminance of transmitted illumination light from a plurality of light emitting diodes.

  According to the sixth aspect of the invention, the relative arrangement of the plurality of light emitting diodes and the plurality of convex lenses is set so that the real image is enlarged with respect to the light emitting diodes.

  According to this configuration, since the real image of the light emitting diode by the convex lens is enlarged with respect to the light emitting diode, the light from each light emitting diode is enlarged and reaches the diffusion member. For this reason, light in which luminance unevenness is further suppressed while suppressing a decrease in luminance is diffused by the diffusion member, and the display panel can be transmitted and illuminated as transmitted illumination light while further suppressing luminance unevenness.

  As a result, it is possible to further suppress luminance unevenness while suppressing a decrease in luminance of transmitted illumination light from a plurality of light emitting diodes.

  According to the seventh aspect of the present invention, the distance between the part of the plurality of light emitting diodes and the diffusing member is different from the distance between the remaining part of the plurality of light emitting diodes and the diffusing member. The focal length of a part of the plurality of convex lenses is set to be different from the focal length of the remaining part of the plurality of convex lenses so that a part of the plurality of convex lenses forms an image as a real image in the diffusing member. It is characterized by.

  According to this configuration, the focal length of some convex lenses is such that some light emitting diodes arranged so as to have different distances from the diffusing member are imaged in the diffusing member as real images by some convex lenses. It is set to be different from the focal length of the remaining convex lens. For this reason, even if the distance between the light emitting diode and the diffusing member is changed, a real image of the light emitting diode can be formed in the diffusing member without changing the distance between the light emitting diode and the convex lens.

  Therefore, even if the arrangement of a part of the diffusing member is changed with respect to the plurality of light emitting diodes, the light that suppresses the luminance unevenness while suppressing the decrease in luminance without changing the relative arrangement of the plurality of light emitting diodes and the integrator lens. Is diffused by the diffusing member, and the display panel can be transmitted and illuminated as transmitted illumination light while suppressing luminance unevenness.

  As a result, even if the arrangement of a part of the diffusing member is changed with respect to the plurality of light emitting diodes, the luminance of transmitted illumination light from the plurality of light emitting diodes is not changed without changing the relative arrangement of the plurality of light emitting diodes and the integrator lens. It is possible to suppress luminance unevenness while suppressing the decrease in brightness.

  According to an eighth aspect of the present invention, the distances between the plurality of light emitting diodes and the diffusing member are arranged different from each other, and the focal lengths are set different from each other.

  According to this configuration, even if the distances between the plurality of light emitting diodes and the diffusing member are different from each other, the relative distance between the plurality of light emitting diodes and the integrator lens is set by setting the focal lengths to be different from each other. A plurality of light emitting diodes can be formed as real images in the diffusing member without changing the general arrangement.

  Therefore, even if the plurality of light emitting diodes are arranged so that the distance from the diffusing member is different from each other, the relative arrangement of the plurality of light emitting diodes and the integrator lens is not changed, and luminance unevenness is suppressed while suppressing a decrease in luminance. The light is diffused by the diffusing member, and the display panel can be transmitted and illuminated as transmitted illumination light while suppressing uneven brightness. As a result, even if the plurality of light emitting diodes are arranged so that the distance from the diffusing member is different from each other, the relative arrangement of the plurality of light emitting diodes and the integrator lens is not changed, and the transmitted illumination light from the plurality of light emitting diodes is not changed. Luminance unevenness can be suppressed while suppressing a decrease in luminance.

1 is a schematic diagram illustrating an overall configuration of a vehicle head-up display device to which a liquid crystal display device according to an embodiment of the present invention is applied. It is an expansion perspective view of the liquid crystal display device shown in FIG. FIG. 3 is a schematic diagram taken in the direction of arrow III in FIG. 2 showing the imaging position of the light emitting diode by the convex lens shown in FIG. 2 and the arrangement of the liquid crystal panel. FIG. 4 is an optical path diagram showing an imaging position of four light emitting diodes by one convex lens shown in FIG. 3 and an arrangement of a liquid crystal panel. It is an optical path figure which shows arrangement | positioning of the light emitting diode with respect to the convex lens shown in FIG. It is a schematic diagram which shows the 1st modification of FIG. It is a schematic diagram which shows the 2nd modification of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the mutually same or equivalent part in a figure.

(Constitution)
A vehicle head-up display device 10 shown in FIG. 1 includes a liquid crystal display device 1 and a half mirror layer 13 formed on the inner surface of a front windshield 11. The half mirror layer 13 has both a function of reflecting light and a function of transmitting light.

  The liquid crystal display device 1 includes a liquid crystal panel 2, an integrator lens 3, and light emitting diodes 51 to 54, and is disposed in the instrument panel 12. The light emitting diodes 51 to 54 are light sources that are disposed on the rear side of the liquid crystal panel 2 that is a light receiving type display panel and illuminate and transmit the liquid crystal panel 2. The light emitting diodes 51 to 54 are mounted on the printed circuit board 4 and arranged on a plane. The liquid crystal panel 2 is disposed to be inclined with respect to the light emitting diodes 51 to 54 disposed on the plane. The integrator lens 3 is a lens that uniformizes the light from the light emitting diodes 51 to 54 and guides the light to the liquid crystal panel 2, and is disposed between the light emitting diodes 51 to 54 and the liquid crystal panel 2.

  For example, the liquid crystal display device 1 displays a display image 21 representing the vehicle speed of the host vehicle. Specifically, the light from the light emitting diodes 51 to 54 is made uniform by the integrator lens 3, and the liquid crystal panel 2 on which the display image 21 is drawn is transmitted and illuminated, whereby the display image 21 is displayed. The light of the display image 21 is reflected toward the viewer M by the half mirror layer 13 according to the optical path P1, and is thereby viewed by the viewer M as a virtual image 22 of the display image 21 in front of the front windshield 11.

  The reason why the liquid crystal panel 2 is inclined with respect to the light emitting diodes 51 to 54 arranged on the plane is that the extraneous light transmitted through the half mirror layer 13 is reflected by the surface of the liquid crystal panel 2 according to the optical path P21. This is to prevent the reflected light from being reflected toward the viewer M by the half mirror layer 13 according to the optical path P1. When the reflected light on the surface of the liquid crystal panel 2 is reflected toward the viewer M, the viewer M visually recognizes the reflected light on the surface of the liquid crystal panel 2 in addition to the virtual image 22 of the display image 21 described above. It becomes difficult to visually recognize the virtual image 22 of the display image 21.

  By tilting the liquid crystal panel 2 as shown in FIG. 1, even if extraneous light transmitted through the half mirror layer 13 is reflected by the surface of the liquid crystal panel 2 according to the optical path P21, the reflected light is visually recognized according to the optical path P22. Heading in a different direction from person M. For this reason, it is possible to prevent the viewer M from visually recognizing the reflected light on the surface of the liquid crystal panel 2.

  On the other hand, if the light emitting diodes 51 to 54 (that is, the printed circuit board 4) are also inclined in accordance with the inclination of the liquid crystal panel 2, that is, if the printed circuit board 4 is arranged in parallel with the inclined liquid crystal panel 2. Since the light from the light emitting diodes 51 to 54 travels along the optical path deviated from the optical path P1, the viewer M cannot visually recognize the virtual image 22 of the display image 21.

  That is, the light emitting diodes 51 to 54 are arranged so that the light from the light emitting diodes 51 to 54 travels in the optical path P1, and the reflected light on the surface of the liquid crystal panel 2 travels in the optical path P22 deviated from the optical path P1. In order to arrange the liquid crystal panel 2, the liquid crystal panel 2 is inclined with respect to the light emitting diodes 51 to 54 arranged on the plane.

  The basic configuration of the liquid crystal display device 1 has been described above. Hereinafter, a characteristic configuration of the liquid crystal display device 1 will be described.

(Characteristic configuration)
As shown in FIG. 2, the integrator lens 3 includes a plurality of convex lenses 31 to 36 and is disposed in parallel with the printed circuit board 4 (light emitting diodes 51 to 54). 2 shows the liquid crystal display device 1 in such a manner that the horizontal direction in FIG. 2 is the vertical direction in FIG. In the integrator lens 3, the convex lenses 31 to 36 are arranged in a line of six in the direction indicated by the arrow AR in FIG. 2, and the integrator lens 3 is composed of 36 convex lenses 31 to 36. .

  The light-emitting diodes 51 to 54 are distinguished for convenience as four light-emitting diodes arranged in a row in the direction indicated by the arrow AR in FIG. 2, but the sixteen light-emitting diodes 51 to 54 are the same. The light emitting diode. As shown in FIG. 3, the relative arrangement of the light emitting diodes 51 to 54 and the integrator lens 3 is set so that the focal points 300 of the convex lenses 31 to 36 are arranged between the light emitting diodes 51 to 54 and the integrator lens 3. is doing. That is, in FIG. 3, the light-emitting diodes 51 to 54 are arranged on the left side of the focal point 300.

  The relative arrangement of the liquid crystal panel 2, the light emitting diodes 51 to 54, and the convex lenses 31 to 36 (integrator lens 3) so that the light emitting diodes 51 to 54 are imaged in the liquid crystal panel 2 as a real image 500 by the convex lenses 31 to 36. And the focal length Lf of the convex lenses 31-36 is set. In FIG. 3, the light emitting diodes 51 to 54 are indicated by arrows, and the real image 500 is inverted by the convex lenses 31 to 36, and thus is indicated by arrows opposite to the arrow directions of the light emitting diodes 51 to 54.

  As described above, since the liquid crystal panel 2 is inclined with respect to the light emitting diodes 51 to 54, the distance between the light emitting diodes 51 to 54 and the liquid crystal panel 2 is increased in the order of the light emitting diodes 51 to 54. For this reason, the focal length Lf of each convex lens 31-36 is set so that it may become long in the order of the convex lenses 31-36, and the light emitting diodes 51-54 are imaged in the liquid crystal panel 2 as the real image 500. FIG.

  As shown in FIG. 4, the four light-emitting diodes 51 to 54 are condensed by one convex lens 33 and, in principle, four real images 531 to 534 at image forming positions parallel to the light-emitting diodes 51 to 54. To form an image. In the example shown in FIG. 4, the relative relationship between the liquid crystal panel 2, the light emitting diodes 51 to 54, and the convex lens 33 so that two of the four real images 531 to 534 are imaged in the liquid crystal panel 2. And the focal length Lf of the focal point 300 of the convex lens 33 are set.

  In FIG. 4, as the focal length Lf of the convex lens 33 increases, the imaging positions of the real images 531 to 534 move in a direction away from the convex lens 33 (rightward in FIG. 4). Further, as the focal length Lf of the convex lens 33 becomes shorter, the imaging positions of the real images 531 to 534 move in a direction approaching the convex lens 33 (leftward in FIG. 4).

  In this way, on the plane shown in FIG. 3, the four light emitting diodes 51 to 54 increase to nine real images 500 (532, 533) and form an image in the liquid crystal panel 2. 2, the relative arrangement of the light emitting diodes 51 to 54 and the convex lenses 31 to 36 and the focal length Lf of the focal point 300 of the convex lenses 31 to 36 are set.

  In the real image 500, the relative arrangement of the light emitting diodes 51 to 54 and the convex lenses 31 to 36 is set so as to be enlarged with respect to the light emitting diodes 51 to 54. Specifically, in FIG. 5, the light emitting diode 52 is disposed on the left side of the position 520 with respect to the convex lens 33. The position 520 is a position where the real image 501 by the convex lens 33 is the same size as the light emitting diode 52 when the light emitting diode 52 is disposed at the position 520. Therefore, even if the light emitting diode 52 is disposed at a position on the left side of the focal point 300, the real image 501 is smaller than the light emitting diode 52 when the light emitting diode 52 is disposed at the position 520 and the focal point 300.

  The liquid crystal display device 1 corresponds to the display device described in the claims, and the liquid crystal panel 2 corresponds to the display panel described in the claims.

(Function and effect)
Next, the operation and effect of the liquid crystal display device 1 of the first embodiment will be described.

  In the liquid crystal display device 1 according to the present embodiment, as a characteristic configuration, a plurality of light emitting diodes 51 to 54 and the integrator lens 3 are arranged in a relative manner between the plurality of light emitting diodes 51 to 54 and the integrator lenses 31 to 36. Since the focal points 300 of the convex lenses 31 to 36 are set to be disposed, the light emitting diodes 51 to 54 are formed as real images 500 at predetermined positions by the convex lenses 31 to 36. Since the light from the light emitting diodes 51 to 54 is collected by the convex lenses 31 to 36 and formed as a real image 500, a decrease in the luminance of the real image 500 is suppressed with respect to the luminance of the light emitting diodes 51 to 54.

  Further, the relative arrangement of the liquid crystal panel 2, the light emitting diodes 51 to 54, and the convex lenses 31 to 36 is formed so that a real image 500 of the plurality of light emitting diodes 51 to 54 is formed in the liquid crystal panel 2 by the plurality of convex lenses 31 to 36. , And the focal length Lf of each focal point 300 of the convex lenses 31 to 36 is set. Therefore, the liquid crystal panel 2 is transmitted and illuminated using the real image 500 formed in the liquid crystal panel 2 as the transmitted illumination light from the light emitting diodes 51 to 54.

  Therefore, since the decrease in the luminance of the real image 500 formed in the liquid crystal panel 2 is suppressed with respect to the luminance of the light emitting diodes 51 to 54, the decrease in the luminance of the transmitted illumination light from the light emitting diodes 51 to 54 is suppressed. Can do.

  In addition, the 16 light emitting diodes 51 to 54 are condensed by one convex lens and formed as 16 real images in principle. For this reason, the 16 light-emitting diodes 51 to 54 are condensed by the 36 convex lenses 31 to 36 and are formed into 576 real images obtained by multiplying (multiplying) 16 and 36 in principle. Therefore, the number of real images formed in the liquid crystal panel 2 can be increased from 16 of the light emitting diodes 51 to 54.

  Specifically, on the plane shown in FIG. 3, four light emitting diodes 51 to 54 increase to nine real images 500 and form an image in the liquid crystal panel 2. For this reason, on the plane shown in FIG. 3, the interval between the real images 500 when the nine real images 500 increased from the four light-emitting diodes 51 to 54 are incident on the liquid crystal panel is four light-emitting diodes 51. ˜54 becomes narrower than the case of direct incidence on the liquid crystal panel 2. Therefore, it is possible to suppress uneven brightness of transmitted illumination light from the plurality of light emitting diodes 51 to 54.

  As a result, luminance unevenness can be suppressed while suppressing a decrease in luminance of transmitted illumination light from the plurality of light emitting diodes 51 to 54.

  In addition, since the real image 500 of the light emitting diodes 51 to 54 by the convex lenses 31 to 36 is enlarged with respect to the light emitting diodes 51 to 54, the transmitted illumination light from each of the light emitting diodes 51 to 54 is expanded and the liquid crystal panel 2 is transmitted and illuminated. To do. For this reason, the brightness | luminance nonuniformity of the transmitted illumination light from the light emitting diodes 51-54 can be suppressed more. In addition, since the light from the light emitting diodes 51 to 54 is collected by the convex lenses 31 to 36 and formed as a real image 500, a decrease in the luminance of the real image 500 is suppressed with respect to the luminance of the light emitting diodes 51 to 54. Is the same even if the real image 500 is enlarged with respect to the light emitting diodes 51 to 54.

  As a result, luminance unevenness can be further suppressed while suppressing a decrease in luminance of transmitted illumination light from the plurality of light emitting diodes 51 to 54.

  Further, the distance between a part of the light emitting diodes 51 to 54 and the liquid crystal panel 2 is arranged to be different from the distance between the remaining part of the light emitting diodes 51 to 54 and the liquid crystal panel 2, and a part of the light emitting diodes 51 to 54 is a convex lens. The focal length Lf of a part of the convex lenses 31 to 36 is set to be different from the focal length Lf of the remaining part of the convex lenses 31 to 36 so that a real image 500 is formed by a part of 31 to 36 in the liquid crystal panel 2. ing. For this reason, even if the distance between the light emitting diodes 51 to 54 and the liquid crystal panel 2 is changed, the real image 500 of the light emitting diodes 51 to 54 is displayed in the liquid crystal panel 2 without changing the distance between the light emitting diodes 51 to 54 and the convex lenses 31 to 36. Can be imaged. That is, even if the arrangement of a part of the liquid crystal panel 2 is changed with respect to the light emitting diodes 51 to 54, the relative arrangement of the light emitting diodes 51 to 54 and the integrator lens 3 is not changed, and the light emitting diodes 51 to 54 are displayed as real images 500. As shown in FIG.

  Therefore, even if the arrangement of a part of the liquid crystal panel 2 is changed with respect to the plurality of light emitting diodes 51 to 54, the relative arrangement of the plurality of light emitting diodes 51 to 54 and the integrator lens 3 is not changed. Luminance unevenness can be suppressed while suppressing a decrease in luminance of transmitted illumination light from 51 to 54.

  Even if the distances between the light emitting diodes 51 to 54 and the liquid crystal panel 2 are different from each other, the focal lengths Lf are set to be different from each other, so that the light emitting diodes 51 to 54 and the integrator lens 3 The light emitting diodes 51 to 54 can be formed as the real image 500 in the liquid crystal panel 2 without changing the relative arrangement.

  Therefore, even if the plurality of light emitting diodes 51 to 54 are arranged so that the distances from the liquid crystal panel 2 are different from each other, the plurality of light emitting diodes 51 to 54 and the integrator lens 3 are not changed in relative arrangement without changing the relative arrangement. Luminance unevenness can be suppressed while suppressing a decrease in the luminance of transmitted illumination light from the diodes 51 to 54.

  In the example shown in FIG. 3, even when the liquid crystal panel is tilted with respect to the light emitting diodes 51 to 54, the integrator lens 3 is maintained in a parallel arrangement state with the light emitting diodes 51 to 54, that is, the light emitting diodes 51 to 54. The light emitting diodes 51 to 54 can be formed as the real image 500 in the liquid crystal panel 2 without changing the relative arrangement of the integrator lens 3. Therefore, even if the liquid crystal panel is tilted with respect to the light emitting diodes 51 to 54, the integrator lens 3 does not need to be provided in a complicated shape and can be formed in a simple plate shape.

(Modification)
In the above example, the real image 500 of the light emitting diodes 51 to 54 formed by the convex lenses 31 to 36 is formed in the liquid crystal panel 2, but the present invention is not limited to this. In the liquid crystal display device 101 according to the first modification shown in FIG. 6, a real image 500 of the light emitting diodes 51 to 54 by the convex lenses 31 to 36 is formed in the diffusion plate 6. The diffusion plate 6 diffuses the light from the light emitting diodes 51 to 54 and is disposed between the integrator lens 3 and the liquid crystal panel 2.

  The liquid crystal display device 101 corresponds to the display device described in the claims, the liquid crystal panel 2 corresponds to the display panel described in the claims, and the diffusion plate 6 corresponds to the diffusion member described in the claims.

  In the liquid crystal display device 101, the relative arrangement of the diffusion plate 6, the light emitting diodes 51 to 54, and the convex lenses 31 to 36 is formed so that a real image 500 of the light emitting diodes 51 to 54 by the convex lenses 31 to 36 is formed in the diffusion plate 6. , And the focal length Lf of each focal point 300 of the convex lenses 31 to 36 is set. For this reason, since the fall of the brightness | luminance of the real image 500 condensed by the several convex lenses 31-36 and image-forming in the diffuser plate 6 is suppressed with respect to the brightness | luminance of the light emitting diodes 51-54, a some light emitting diode A decrease in luminance of light reaching the diffusion plate 6 from 51 to 54 can be suppressed.

  In addition, the 16 light emitting diodes 51 to 54 are condensed by one convex lens and formed as 16 real images in principle. For this reason, the 16 light-emitting diodes 51 to 54 are condensed by the 36 convex lenses 31 to 36 and are formed into 576 real images obtained by multiplying 16 by 36 in principle. Therefore, the number of real images formed in the diffusing plate 6 can be increased from 16 of the light emitting diodes 51 to 54.

  Specifically, on the plane shown in FIG. 6, the four light emitting diodes 51 to 54 increase to nine real images 500 and form an image in the diffusion plate 6. Therefore, on the plane shown in FIG. 6, the interval between the real images 500 when the nine real images 500 increased from four of the light emitting diodes 51 to 54 are incident on the diffusion plate 6 is four light emitting diodes. This is narrower than when 51 to 54 are directly incident on the diffusion plate 6. That is, the luminance unevenness of the light reaching the diffusion plate 6 from the plurality of light emitting diodes 51 to 54 can be suppressed.

  Therefore, it is possible to suppress luminance unevenness while suppressing a decrease in the luminance of light reaching the diffusion plate 6 from the plurality of light emitting diodes 51 to 54. The light that suppresses the luminance unevenness while suppressing the decrease in luminance is diffused by the diffusion plate 6, and can further transmit the liquid crystal panel 2 as transmitted illumination light while suppressing the luminance unevenness. Here, since the light with suppressed luminance unevenness while suppressing the decrease in luminance reaches the diffusion plate 6, it is not necessary to excessively suppress the luminance unevenness with the diffusion plate 6. For this reason, it is not necessary to excessively improve the light diffusing performance of the diffusing plate 6, so that it is possible to suppress a decrease in luminance of the transmitted illumination light due to the diffusing plate 6.

  As a result, luminance unevenness can be suppressed while suppressing a decrease in luminance of transmitted illumination light from the plurality of light emitting diodes 51 to 54.

  Similarly to the above example, if the relative arrangement of the plurality of light emitting diodes and the plurality of convex lenses is set so that the real image 500 is enlarged with respect to the light emitting diodes 51 to 54, the plurality of light emitting diodes 51 are arranged. The luminance unevenness can be further suppressed while suppressing a decrease in the luminance of the transmitted illumination light from .about.54.

  In the above example, the real image 500 is formed in the liquid crystal panel 2 inclined with respect to the light emitting diodes 51 to 54 or in the diffusion plate 6 inclined with respect to the light emitting diodes 51 to 54. I did it. In the integrator lens 3 of the liquid crystal display device 1 shown in FIG. 3, the focal length Lf of the convex lenses 31 to 36 is increased in the order of the convex lenses 31 to 36 in order to form a real image 500 in the inclined liquid crystal panel 2. Was set as follows.

  In contrast, in the liquid crystal display device 102 according to the second modification shown in FIG. 7, the liquid crystal panel 2 is arranged in parallel to the light emitting diodes 51 to 54, and the real image 502 of the light emitting diodes 51 to 54 is inside the liquid crystal panel 2. In the integrator lens 30, the focal length Lf of the focal point 301 of each convex lens 37 is set to be the same. For this reason, the 16 light-emitting diodes 51 to 54 are condensed by the 36 convex lenses 37 and, in principle, 576 pixels obtained by multiplying the 16 and 36 by the imaging positions parallel to the light-emitting diodes 51 to 54. It forms as a real image.

  In the liquid crystal display device 102, the liquid crystal panel 2 is arranged in parallel to the light emitting diodes 51 to 54, and most of the 576 real images can be formed as the real images 502 in the liquid crystal panel 2. Therefore, a significantly larger number of real images 502 can be formed in the liquid crystal panel 2 as compared with the number of real images 500 formed in the inclined liquid crystal panel 2 or the diffusion plate 6. For this reason, compared with the liquid crystal display devices 1 and 101, the liquid crystal display device 102 according to the second modification has uneven brightness while suppressing a decrease in the brightness of the transmitted illumination light from the plurality of light emitting diodes 51 to 54. It can be suppressed more.

  In the liquid crystal display device in which a real image is formed in the diffusion plate 6 arranged parallel to the light emitting diodes 51 to 54, the focal point of each convex lens in the integrator lens is the same as in the second modification. The distance Lf is set to be the same. Thereby, the effect similar to a 2nd modification can be acquired.

  In the above example, the 16 light emitting diodes 51 to 54 and the 36 convex lenses 31 to 36 (37) are used. However, the number is not limited thereto.

  Further, on the plane shown in FIG. 3, the four light emitting diodes 51 to 54 are increased to nine real images 500 to form an image in the liquid crystal panel 2, but the liquid crystal panel for the light emitting diodes 51 to 54 is formed. The number of real images formed in the liquid crystal panel 2 varies depending on the degree of inclination of 2, the plate thickness of the liquid crystal panel 2, and the like.

  On the plane shown in FIG. 6, the four light emitting diodes 51 to 54 are increased to nine real images 500 and imaged in the diffusion plate 6, but the inclination degree of the diffusion plate 6 with respect to the light emitting diodes 51 to 54, The number of real images formed in the diffusion plate 6 varies depending on the thickness of the diffusion plate 6 and the like.

1,101-102 Liquid crystal display device (display device), 2 Liquid crystal panel (display panel)
21 Display image, 22 Virtual image, 3, 30 Integrator lens 31-36, 37 Convex lens, 300, 301 Focus, 4 Printed circuit board 51-54 Light emitting diode, 500, 501, 502, 531-534 Real image 520 Position, 6 Diffuser ( Diffusion member) 10 Head-up display device for vehicle 11 Front windshield, 12 Instrument panel 13 Half mirror layer, P1, P21, P22 Optical path, Lf Focal length AR Arrow, M Viewer

Claims (8)

A light receiving display panel;
A plurality of light emitting diodes disposed on the rear side of the display panel and transmitting and illuminating the display panel;
An integrator lens that is disposed between the plurality of light emitting diodes and the display panel and includes a plurality of convex lenses, and
The relative arrangement of the plurality of light emitting diodes and the integrator lens is set so that the focal points of the plurality of convex lenses are arranged between the plurality of light emitting diodes and the integrator lens,
Relative arrangement of the display panel, the plurality of light emitting diodes, and the plurality of convex lenses so that the plurality of light emitting diodes form an image in the display panel as a real image by the plurality of convex lenses; and A display device characterized in that a focal length is set.   The display device according to claim 1, wherein the relative arrangement of the plurality of light emitting diodes and the plurality of convex lenses is set so that the real image is enlarged with respect to the light emitting diode. A distance between a part of the plurality of light emitting diodes and the display panel is arranged to be different from a distance between the remaining part of the plurality of light emitting diodes and the display panel,
The partial focal length of the plurality of convex lenses is the remainder of the plurality of convex lenses so that the part of the plurality of light emitting diodes forms an image in the display panel as a real image by a part of the plurality of convex lenses. The display device according to claim 1, wherein the display device is set to be different from a focal length of the display device. The distance between the plurality of light emitting diodes and the display panel is arranged so as to be different from each other,
The display device according to claim 3, wherein the focal lengths are set to be different from each other. A light receiving display panel;
A plurality of light emitting diodes disposed on the rear side of the display panel and transmitting and illuminating the display panel;
An integrator lens that is disposed between the plurality of light emitting diodes and the display panel and includes a plurality of convex lenses;
A diffusing member that is disposed between the integrator lens and the display panel and diffuses light;
The relative arrangement of the plurality of light emitting diodes and the integrator lens is set so that the focal points of the plurality of convex lenses are arranged between the plurality of light emitting diodes and the integrator lens,
A relative arrangement of the diffusing member, the plurality of light emitting diodes, and the plurality of convex lenses, and a plurality of light emitting diodes formed as real images within the diffusing member by the plurality of convex lenses, A display device characterized in that a focal length is set.   The display device according to claim 5, wherein the relative arrangement of the plurality of light emitting diodes and the plurality of convex lenses is set so that the real image is enlarged with respect to the light emitting diodes. A distance between a part of the plurality of light emitting diodes and the diffusion member is arranged to be different from a distance between the remaining part of the plurality of light emitting diodes and the diffusion member,
The focal length of the part of the plurality of convex lenses is the remainder of the plurality of convex lenses so that the part of the plurality of light emitting diodes forms an image in the diffusion member as a real image by a part of the plurality of convex lenses. The display device according to claim 5, wherein the display device is set so as to be different from the focal length. The distance between the plurality of light emitting diodes and the diffusing member is arranged so as to be different from each other,
The display device according to claim 7, wherein the focal lengths are set to be different from each other.

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