JP2007206725A - Projection-type video display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a practical projection-type video display device that uses a solid-state light-emitting devices. <P>SOLUTION: The projection-type video display device is equipped with first, second and third light sources 12, where a plurality of solid light-emitting devices 11 are arranged in an arrayed state; first, second and third display elements 3 for modulating light emitted from the respective light sources 12; first, second and third integrating means 13 for integrating and guiding the light emitted from the respective light sources 12 to the respective display elements 3; a compositing means 4 compositing the modulated lights of respective colors modulated by the respective display elements 3; a projection means 5 for projecting video light composited by the composing means 4; and a lighting control means 21 for controlling power supplied to the respective solid-state light-emitting devices 11. The lighting control means 21 supplies a current higher than stationary current to the solid-state light-emitting devices 11 at prescribed time intervals. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a projection display apparatus.

As an illuminating device used for a liquid crystal projector or the like, a lighting device such as an ultra-high pressure mercury lamp, a metal halide lamp, a xenon lamp or the like and a parabolic reflector that collimates the irradiation light is generally used. Further, in such an illumination device, in order to reduce unevenness in the amount of light on the irradiation surface, an integration function by a pair of fly-eye lenses (a plurality of illumination areas of a predetermined shape sampled and formed in a plane by an optical device on an illumination object Some have a function of superimposing and condensing). Furthermore, in recent years, it has been attempted to use a light emitting diode (LED) as a light source from the viewpoint of power saving or the like (see Patent Documents 1-7).
Japanese Patent Laid-Open No. 10-186507 Japanese Patent Laid-Open No. 11-065477 JP 2000-056410 A Japanese Patent Laid-Open No. 2000-112031 JP 2001-016551 A JP 2001-249400 A Japanese Patent Application Laid-Open No. 2002-244211

  However, the actual situation is that a practical lighting device has not been obtained using a light emitting diode. In view of the above circumstances, an object of the present invention is to provide a practical projection display apparatus using a solid light emitting element such as a light emitting diode.

  In order to solve the above-described problem, the present invention provides a first light source in which a plurality of solid state light emitting elements emitting a first color are arranged in an array, and light emitted from the first light source. A first display element that performs modulation; a first integration means that guides light emitted from the first light source by integrating it into the first display element; and a plurality of solid state light emitting elements that emit a second color Are arranged in an array, a second display element that modulates the light emitted from the second light source, and the light emitted from the second light source as the second light source. Second integration means for integrating and guiding to the display element, a third light source in which a plurality of solid-state light emitting elements emitting a third color are arranged in an array, and light emitted from the third light source A third display element which modulates the third light source, and the third light source Each color modulated by the third integrating means for integrating and guiding the light emitted from the third display element, the first display element, the second display element, and the third display element A projection-type image display apparatus comprising: a combining unit that combines the modulated light; a projection unit that projects the image light combined by the combining unit; and a lighting control unit that controls power supplied to each of the solid-state light emitting elements. The lighting control means supplies a current larger than a steady current to the solid state light emitting element at a predetermined time interval.

  In the above configuration, the amount of light increases when a solid current is instantaneously caused to emit light rather than a steady current caused to flow to the solid state light emitting element.

  In the projection display apparatus, each of the plurality of solid state light emitting elements is divided into at least two groups, and the lighting control unit controls power supplied in units of the groups. Features. By causing another solid light emitting element to emit light between the time when one solid light emitting element emits light and the next time it emits light, it is possible to increase the amount of light compared to the case where a plurality of solid light emitting elements emits light in total. become. Further, since the light emitted from each solid-state light emitting element is integrated and guided to the illumination object, it is possible to prevent the light and darkness of the array from being formed on the illumination object.

  Further, in the projection display apparatus, at least one of the first integration unit, the second integration unit, and the third integration unit may use a fly-eye lens.

  As described above, according to the present invention, a plurality of solid state light emitting elements arranged in an array are sequentially emitted, so that the amount of light is increased compared to the case where a plurality of solid state light emitting elements emits light in total. obtain.

  Hereinafter, a projection display apparatus according to an embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a diagram showing an optical system and a control system of a three-plate type projection display apparatus. The projection display apparatus includes three illumination devices 1R, 1G, and 1B (hereinafter, when the individual illumination devices are indicated without being specified, the symbol “1” is used). The illumination device 1R emits red light, the illumination device 1G emits green light, and the illumination device 1B emits blue light. The light emitted from each illuminating device 1 is guided to the liquid crystal display panels 3R, 3G, and 3B for the respective colors by the condenser lens 2 (hereinafter, when the individual liquid crystal display panels are indicated without being specified, the symbol “3” is indicated). Use). Each liquid crystal display panel 3 includes an incident side polarizing plate, a panel portion in which liquid crystal is sealed between a pair of glass substrates (pixel electrodes and alignment films are formed), and an output side polarizing plate. . The modulated light (each color video light) modulated by passing through the liquid crystal display panels 3R, 3G, 3B is synthesized by the dichroic prism 4 to become color video light. This color image light is enlarged and projected by the projection lens 5 and projected and displayed on the screen.

  The lighting device 1 includes a light source 12 in which LED chips 11 are arranged in an array and lens cells 14 are arranged on the light emission side of each LED chip 11, and the lens cells 14 that are emitted from the LED chips 11 and emitted from the LED cells 11. The fly-eye lens pair 13 integrates and guides the light collimated by the liquid crystal display panel 3. The fly-eye lens pair 13 is composed of a pair of lens groups 13 a and 13 b, and each lens pair guides light emitted from each LED chip 11 to the entire surface of the liquid crystal display panel 3. The LED chips 11 are molded with a transparent resin, and the transparent resin is formed in a convex shape to constitute the lens cells 14. The LED chip 11 and the lens cell 14 may be round, but in this embodiment, the LED chip 11 and the lens cell 14 are formed in a square shape and further correspond to the aspect ratio of the liquid crystal display panel 3.

  Further, as shown in FIG. 2A, the LED chips 11 are divided into two groups A and B, and are configured such that power is supplied in units of groups. The light source lighting control unit 21 causes the LED chip 11 to emit light in pulses. In pulsed light emission, the amount of light increases compared to steady light emission when a large current is input in a short time. However, a predetermined interval is required from the pulse emission to the next pulse emission. In order to fill this interval, the light source lighting control unit 21 supplies power to cause the two groups A and B to emit pulses on the other side during the interval on one side, as shown in FIG. To control.

  In the above configuration, it is desirable from the viewpoint of light integration that the LED chips 11 of the two groups A and B are interspersed.

  FIG. 3 shows another example of the optical system and pulse emission control. As shown in FIG. 2B, the LED chips 11 are divided into four groups C, D, E, and F, and are configured such that power is supplied in units of groups. In this optical system, a condenser lens pair 7 including a first condenser lens group 7a and a second condenser lens group 7b is provided on the optical path from the fly-eye lens pair 13 to the liquid crystal display panel 3, and this condenser By the action of the lens pair 7, the pulsed light is irradiated on the liquid crystal display panel 3 in different areas from each other in a stripe shape. Optical integration is also performed in such a striped irradiation of the pulsed light on the liquid crystal display panel 3 (non-entire surface of the liquid crystal display panel). In this embodiment, the pulsed light from the group C is guided to the upper quarter region of the liquid crystal display panel 3, and the pulsed light from the group D is below the irradiation region of the pulsed light from the group C. The pulsed light from the group E is guided to the lower 1/4 region of the irradiation region of the pulsed light from the group D, and the pulsed light from the group F is guided to the liquid crystal display panel 3. To the lower quarter region.

  FIG. 3B shows the light emission timings of the four groups C, D, E, and F. As can be seen from this figure, the pulse emission of the group D starts during the pulse emission of the group C, and the pulse emission of the group E starts simultaneously with the end of the pulse emission of the group C. Then, the pulse emission of the group D ends in the middle of the pulse emission of the group E, and the pulse emission of the group F is started simultaneously with this end. That is, the four groups C, D, E, and F in the LED chips 11... Emit light in a pulse manner as C + D → D + E → E + F → F + C →.

  In this embodiment, video data is written on the liquid crystal display panel 3 from the upper side, and the pulse emission irradiation area on the liquid crystal display panel 3 changes in accordance with the writing position of the video data. It will be. Accordingly, as shown in FIG. 5C, it becomes possible to irradiate the pulsed light while avoiding the transition period in the liquid crystal response of the liquid crystal display panel 3 as much as possible, and the liquid crystal display panel 3 (other hold type) It is possible to prevent the deterioration of moving image quality (including afterimage reduction / motion compensation effect) that tends to occur in a display element).

  FIG. 4 shows another example of the optical system and pulse emission control. The light source 50 is formed by arranging molded LEDs 50b... In an array on the outer peripheral surface of the cylindrical body 50a. . A gear (not shown) is provided on a side surface of the cylindrical body 50a, and a driving force from a driving system (not shown) (including a motor and a reduction gear) is transmitted to the gear, so that the cylindrical body 50a is Driven by rotation. The LEDs 50b... Arranged in the axial direction form one group, and power is supplied in units of groups. For example, the LEDs 50b arranged in the axial direction are connected to a common power supply line, a terminal is provided at the end of the power supply line, and a fixedly arranged brush (power supply terminal) (not shown) is in contact with the terminal. It is provided in the position to be. Further, the ground wire is common to all the LEDs 50b, and this ground wire is brought into contact with the fixed shaft (made of metal), for example. When the cylindrical body 50a rotates, each group receives a large current and emits pulses when the terminal of the power supply line comes into contact with the fixedly arranged brush.

  The length of the LEDs 50b arranged in the axial direction is made to correspond to the horizontal length in the aspect ratio of the liquid crystal display panel 3. The rotational speed of the cylindrical body 50a is set so that the rotational movement amount of the LED 50b during the pulse emission time corresponds to the vertical length in the aspect ratio of the liquid crystal display panel. Of course, in addition to the one-to-one correspondence with the aspect ratio of the liquid crystal display panel 3, by adjusting the pulse emission timing and the rotational movement amount, the aspect ratio of the liquid crystal display panel 3 is one-to-one and one to one vertically. It is also possible to make it correspond by 1/2.

  In the above configuration, the lighting timing is controlled by the drive system and the power supply system using the brush, and the LEDs 50b... That have reached a predetermined position (brush position) by rotation sequentially emit pulses. In addition to the general lighting timing control, it is possible to perform electronic lighting timing control.

  Further, it is preferable to provide a fly-eye lens pair at a position where the pulsed light from the light source 50 is received. Furthermore, it is preferable that the aspect ratio of the individual lenses in the fly-eye lens pair correspond to the aspect ratio of the liquid crystal display panel 3, or the light emission area of the LED 50b corresponds to the aspect ratio of the liquid crystal display panel 3. Further, a rod integrator may be provided instead of the fly-eye lens pair. Also for this rod integrator, it is preferable that the shape on the light emitting side and the shape on the light incident side correspond to the aspect ratio of the liquid crystal display panel 3.

  In the above embodiment, a liquid crystal display panel is used as the display panel. However, the present invention is not limited to this, and a display panel of a type that individually drives micromirrors serving as pixels may be used. Further, the solid state light emitting device is not limited to a light emitting diode (LED). Moreover, although the structure provided with three display panels was shown, it is good also as a structure which guides the light from the illuminating device 1 to the display panel of 1 sheet, disperse | distributing or not disperse | distributing. For example, R, G, and B LEDs are arranged on a plane, and pulsed light emission is performed in order ({R: light emission, G, B: off} → {G: light emission, R, B: off} ...), and RGB If a liquid crystal panel provided with a color filter is used, a single-plate projector is obtained.

It is explanatory drawing which showed the projection type video display apparatus concerning this invention. (A) It is explanatory drawing which showed the illuminating device of the projection type video display apparatus concerning this invention, (b) It is explanatory drawing which showed control of the pulse light emission of an illuminating device. (A) An explanatory view showing a lighting device according to another example, (b) an explanatory view showing control of pulsed light emission of the lighting device according to another example, and (c) illustrating the relationship between the liquid crystal response and the pulse light emission timing. FIG. It is explanatory drawing which showed the illuminating device which concerns on another example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Illuminating device (1R: Red light illuminating device, 1G: Green light illuminating device, 1B: Blue light illuminating device), 2 ... Condensing lens, 3 ... Liquid crystal display panel (3R: Red liquid crystal display panel, 3G: Green Liquid crystal display panel, 3B: blue liquid crystal display panel), 4 ... dichroic prism, 5 ... projection lens, 7 ... condenser lens pair (7a: first condenser lens group, 7b: second condenser lens group), 11 ... LED Chip: 12 ... Light source, 13 ... Fly eye lens pair, 14 ... Lens cell, 21 ... Light source lighting control unit, 50 ... Light source (50a cylindrical body, 50b LED)

Claims (3)

A first light source in which a plurality of solid state light emitting elements emitting a first color are arranged in an array; a second light source in which a plurality of solid state light emitting elements emitting a second color are arranged in an array; and a third A third light source in which a plurality of solid-state light emitting elements emitting colors are arranged in an array; a first display element that modulates light emitted from the first light source; and the second light source A second display element that modulates the light emitted from the third light source, a third display element that modulates the light emitted from the third light source, and the light emitted from each light source. Integrating means for integrating and leading to each display element; combining means for combining modulated light of each color modulated by the first display element, the second display element, and the third display element; Projection means for projecting image light synthesized by the synthesis means; and And lighting control means for controlling the power supplied to the solid-state light-emitting element, in the projection type image display apparatus comprising,
The projection display device characterized in that the lighting control means supplies a current larger than a steady current to the solid state light emitting element at a predetermined time interval.   2. The projection display apparatus according to claim 1, wherein each of the plurality of solid state light emitting elements is divided into at least two groups, and the lighting control unit controls power supplied in units of the groups. A projection display apparatus characterized by the above.   3. The projection display apparatus according to claim 1, wherein at least one of the first integration means, the second integration means, and the third integration means is a fly-eye lens. A projection-type image display device.

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