JP2007163988A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector such that a user can visually change settings of a light source section. <P>SOLUTION: Image data regarding a previously stored chromaticity diagram are output to a DMD 11. In timing thereto, image data corresponding to chromaticity diagrams regarding control information of a plurality of light source sections 23 set by a control section 2 which performs illumination control over the light source sections 23 are output to the DMD 11. Information for changing the control information is accepted and the light source sections 23 are brought under the illumination control based upon the accepted control information having been changed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a projector having a control unit that controls lighting of a plurality of light source units and a spatial light modulation unit that modulates light from the light source units according to image data.

  A projector projects light (projection light) in accordance with an image signal supplied from an image supply device such as a computer and displays an image. In recent years, it has been considered to use a solid-state light emitting element for a light source unit of a projector. Projectors are required to save space and portability, and tend to be smaller and lighter. A conventional ultra-high pressure mercury lamp used as a light source unit can supply high-intensity light, but requires a large and heavy drive circuit, which hinders miniaturization and weight reduction of the projector. The solid light-emitting element is small and light, and the illumination optical system can be simplified by using the solid light-emitting element.

  For this reason, the use of a solid light emitting element in the light source unit can particularly promote the reduction in size and weight of the projector. A solid-state light emitting element is suitable for a light source of a projector because its luminance is remarkably improved by recent development, and it has a long life and low power consumption. A projector using a solid-state light emitting element is described in Patent Document 1, for example.

Further, Patent Document 2 discloses a technique for controlling a solid-state light emitting element used in a color liquid crystal display device. In the liquid crystal display device of Patent Document 2, when one color of the light emitting elements of the three primary colors of light is turned on, at least one of the other two colors is simultaneously turned on for color correction.
JP 2005-25160 A JP 2002-372953 A

  However, the technique disclosed in Patent Document 2 performs correction at the manufacturing stage in order to eliminate variations in solid-state light emitting device products themselves and individual differences between products, and a user who uses the projector can freely adjust each solid-state device. There was a problem that the light emitting element could not be adjusted. In particular, specialists and users who require high-quality images require fine color adjustments, and color re-adjustment is also necessary due to secular changes.

  Further, a projector using a color wheel uses an ND green filter in order to reduce bit diffusion noise in a low luminance region. However, this filter has a problem that the color balance is lost, and vertical stripes are generated on the display screen. There were also problems such as.

  Further, when the room where the projector is used is bright or the image data is generally bright, the reproducibility of a low-luminance color such as black is not sufficient, and conversely, when the room is dark or the image data is generally bright. In that case, there was a problem that the screen became whitish.

  The present invention has been made in view of such circumstances, and an object of the present invention is to output image data corresponding to control information of a light source unit together with image data corresponding to a chromaticity diagram, and control information of each light source unit. An object of the present invention is to provide a projector that allows the user to visually change the setting of the light source unit by accepting the change.

  Another object of the present invention is to reduce the bit diffusion noise in the low-luminance region by turning on or off one light source unit so as to reach a predetermined emission intensity step by step, and when using an ND green filter. It is an object of the present invention to provide a projector capable of improving color linearity as compared with the above.

  Another object of the present invention is to output an image according to the surrounding environment by increasing or decreasing the light emission intensity or the light emission time of the light source unit according to the ambient brightness or the average brightness of the image data. Is to provide a simple projector.

  A projector according to the present invention is a chromaticity diagram stored in advance in a projector including a control unit that controls lighting of a plurality of light source units and a spatial light modulation unit that modulates light from the light source units according to image data. Chromaticity diagram output means for outputting image data relating to the spatial modulation unit, and outputting image data corresponding to the chromaticity diagram relating to control information of a plurality of light source units set by the control unit to the spatial modulation unit Control information output means, receiving means for receiving information for changing the control information, and change control means for controlling the lighting of the light source unit based on the received control information after the change. .

  In the projector according to the present invention, the control information output means includes a file storing coordinate values on the chromaticity diagram corresponding to control information including light emission intensity or light emission time of each light source unit, and the control unit. Means for reading out coordinate values on the chromaticity diagram stored in the file corresponding to the set control information of each light source unit, and image data corresponding to the read coordinate values on the chromaticity diagram to the spatial modulation unit And means for outputting.

  The projector according to the present invention is configured such that the accepting unit accepts a coordinate value after change with respect to the coordinate value output by the control information output unit as control information after change, and the change control unit includes The control information after the change is read from the file based on the coordinate value after the change, and the light source unit is controlled based on the read control information after the change.

  In the projector according to the present invention, the control unit is configured to turn on another light source unit with a predetermined light emission intensity when one light source unit is turned on.

  The projector according to the present invention is characterized in that the control unit is configured to turn on another light source unit for a predetermined time when one light source unit is turned on.

  The projector according to the present invention is characterized in that the control unit is configured to turn on or off one light source unit so as to reach a predetermined light emission intensity step by step.

  The projector according to the present invention further includes a sensor that detects ambient brightness, and a unit that increases or decreases the light emission intensity or the light emission time of the light source unit based on the brightness detected by the sensor. And

  The projector according to the present invention further includes means for calculating an average luminance of the image data, and means for increasing or decreasing the light emission intensity or the light emission time of the light source unit by the control unit based on the calculated average luminance. To do.

  In the present invention, image data relating to a chromaticity diagram stored in advance is output to the spatial modulation unit. In accordance with this, image data corresponding to the chromaticity diagram relating to the control information of the plurality of light source units set by the control unit that controls the lighting of the light source unit is output to the spatial modulation unit. This is based on the control information of each light source unit set from the file storing the coordinate values on the chromaticity diagram corresponding to the control information including the light emission intensity or the light emission time of each light source unit. This is done by reading the upper coordinate value and outputting image data corresponding to the coordinate value on the chromaticity diagram to the spatial modulation unit.

  Then, information for changing the control information is received, and lighting control of the light source unit is performed based on the received control information after the change. This is to accept the changed coordinate value for the output coordinate value as the changed control information, read the changed control information from the file based on the received changed coordinate value, and read the changed control information The light source unit is controlled to be turned on based on the information. The light source unit is controlled by, for example, turning on another light source unit at a predetermined light emission intensity or lighting it for a predetermined time when one light source unit is turned on. With this configuration, the user can set the desired light source unit visually with reference to the chromaticity diagram.

  Further, in the present invention, the control unit turns on or off one light source unit so as to reach a predetermined emission intensity step by step, so that it is possible to reduce the bit diffusion noise in the low luminance region as in the case of using a filter. Moreover, since no filter is used, the linearity can be improved without losing the color balance.

  In the present invention, the sensor detects the brightness around the projector. Then, based on the brightness detected by the sensor, the control unit increases or decreases the light emission intensity or the light emission time of the light source unit. In addition, the average luminance of the image data is calculated, and based on the calculated average luminance, the control unit increases or decreases the light emission intensity or the light emission time of the light source unit, so that an image with higher contrast can be output.

  In the present invention, since the chromaticity diagram is output and the image data corresponding to the control information of each light source unit is output together and the control information is changed, the user can visually adjust the desired color. Can be done.

  Further, in the present invention, since one light source unit is turned on or off step by step so as to reach a predetermined light emission intensity, bit diffusion noise in a low luminance region can be reduced as in the case of using a filter, and the filter Therefore, linearity can be improved without losing the color balance.

  In the present invention, the light emission intensity or the light emission time of the light source unit is increased or decreased based on the brightness detected by the sensor. In addition, since the average luminance of the image data is calculated and the light emission intensity or the light emission time of the light source unit is increased or decreased based on the calculated average luminance, the present invention has an excellent effect such that an image with higher contrast can be output. .

Embodiment 1
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a hardware configuration of a projector according to the present invention, and FIG. 2 is a block diagram showing a hardware configuration of a control unit. In FIG. 1, reference numeral 1 denotes a projector according to the present invention, which includes a light source unit 23, a control unit 2, a sensor 24, an average luminance calculation circuit 25, a spatial light modulation unit (hereinafter referred to as DMD: Digital Micromirror Device) 11, a DMD controller 12, and a field lens. 13 includes a projection lens 14 that projects light onto the screen 15, a separation signal input unit 17, a decoded signal input unit 18, a 3DYC separation processing unit 19, and an input switching unit 16.

  The light source unit 23 of the projector 1 includes a plurality of light emitting diode elements (hereinafter referred to as LEDs) that are solid state light emitting elements, and each LED is controlled by the control unit 2. The light source unit 23 includes a red LED 23R that supplies red light, a green LED 23G that supplies green light, and a blue LED 23B that supplies blue light.

  The light supplied from the light source unit 23 passes through the field lens 13 and then enters the DMD 11. The field lens 13 has a function of illuminating the DMD 11 in a telecentric manner, that is, a function of making the illumination light enter the DMD 11 as parallel as possible to the principal ray. As the DMD 11, a tilt mirror device can be used, for example, a DMD manufactured by Texas Instruments Incorporated. The DMD 11 has a movable mirror element (not shown) that reflects light from the light source unit 23 toward the projection lens 14. The projector 1 forms an image of the light source unit 23 at the position of the entrance pupil of the projection lens 14 and irradiates the DMD 11 with Koehler illumination. The DMD 11 modulates incident light according to image data in accordance with an instruction from the DMD controller 12. The light modulated by the DMD 11 is emitted in the direction of the projection lens 14. The projection lens 14 projects the light emitted from the DMD 11 onto the screen 15.

  The DMD 11 has a plurality of movable mirror elements, and each movable mirror element is selectively moved between the first reflection position and the second reflection position in accordance with an instruction from the DMD controller 11 according to the image data. Incident light is reflected in the direction of the projection lens 14 (on) or in a direction other than the projection lens 14 (off). The light traveling in the direction of the projection lens 14 forms a projection image on the screen 15.

  The light source unit 23 illuminates the DMD 11 by sequentially lighting the red LED 23R, the green LED 23G, and the blue LED 23B during one frame of the projected image. An observer integrates and recognizes red light, green light, and blue light that are sequentially illuminated from the light source unit 23 and modulated by the DMD 11. For this reason, a full-color projection image is obtained on the screen 15. In order to sequentially project red light, green light, and blue light and obtain a white projected image as a whole, the amount of green light needs 60 to 80% of the total amount of light. If the output amount and quantity of each color light LED are the same, the amount of green light flux will be insufficient. Therefore, when the same number of LEDs for red light, green light, and blue light are arranged, the lighting time of the green LED 23G is made longer than the lighting time of the red LED 23R and the blue LED 23B. When the number of green LEDs 23G is larger than the number of red LEDs 23R and blue LEDs 23B, the lighting time of the green LEDs 23G can be the same as or shorter than the lighting times of LEDs of other color lights. Thereby, a natural full-color image can be obtained.

  The image data is a composite signal input unit 18 to which a composite signal in which the luminance signal and color signal are combined without being separated is input from the outside, or a separation signal in which a separation signal from which the luminance signal and color signal are separated is input from the outside Input from the input unit 17. The composite signal input unit 18 or the separation signal input unit 17 is connected to an external device (not shown) such as an external tuner, a set top box, or a video recording device, and is configured to receive image data from the external device. The composite signal input unit 18 is connected to a 3DYC separation processing unit 19 that performs 3DYC separation processing of image data. The composite signal input unit 18 inputs a composite signal input from the outside to the 3DYC separation processing unit 19, and the 3DYC separation processing unit 19 performs 3DYC separation processing on the composite signal input from the composite signal input unit 18. The composite signal is separated into a luminance signal and a color signal and output to the input switching unit 16.

  The 3DYC separation processing unit 19 and the separation signal input unit 17 are connected to the input switching unit 16, and the image data obtained by separating the luminance signal and the color signal is input to the input switching unit 16. The input switching unit 16 switches the image data input from the 3DYC separation processing unit 19 or the separation signal input unit 17 according to the input, and outputs the input image data to the average luminance calculation circuit 25. The average luminance calculation circuit 25 calculates the average luminance of the luminance signal for one frame input from the input switching unit 16 and outputs the calculated average luminance to the control unit 2. The average luminance calculation circuit 25 outputs the luminance signal and the color signal input from the input switching unit 16 to the DMD controller 12.

  The control unit 2 shown in FIG. 2 includes a CPU (Central Processing Unit) 21, a RAM (Random Access Memory) 22, and an LED driver 26D that drives a red LED 23R, a green LED 23G, and a blue LED 23B. The CPU 21 is connected to each hardware part of the control unit 2 via the bus 27 and controls them, and executes various software functions according to a control program stored in the RAM 22. A sensor 24 is connected to the controller 2. The sensor 24 is provided with the periphery facing the surface of the casing (not shown) of the projector 1, detects the brightness of the environment around the projector 1, and outputs the detected brightness to the CPU 21.

  An input unit 26 composed of a plurality of input buttons and the like is provided on the surface of the projector 1 (not shown). Information input from the input unit 26 is received by the control unit 2. In addition, you may comprise the input part 26 by the remote control provided with an infrared receiver and an infrared transmitter. The RAM 22 stores the coordinate information on the chromaticity diagram corresponding to the control information including the light emission intensity or the light emission time of the red LED 23R, the green LED 23G, and the blue LED 23B. Includes luminance file 223 storing control information of LED 23R, green LED 23G and blue LED 23B, chromaticity diagram file 222 storing image data of chromaticity diagram, and emission intensity or emission time of red LED 23R, green LED 23G and blue LED 23B A setting file 224 that stores current control information is stored.

  FIG. 3 is an explanatory diagram showing a chromaticity diagram displayed on the screen 15 and control information of the light source unit 23. The graph shown in FIG. 3 is an xy chromaticity diagram developed on the x-axis and the y-axis. The chromaticity diagram defines the light intensity of all red, green and blue as 1, the x-axis as the ratio of red, the y-axis as the ratio of green, and the relative ratio of the remaining blue as the ratio of red and green. In the coordinate space, a color corresponding to each ratio is expressed. In FIG. 3, rectangular G is a green region, R is a red region, and B is a blue region. A triangle indicated by a dotted line includes a vertex coordinate 10R related to the initial setting of the control information of the red LED 23R, a vertex coordinate 10G related to the initial setting of the control information of the green LED 23G, and a vertex coordinate 10B related to the initial setting of the control information of the blue LED 23B. The coordinate value of each color at the time of factory shipment is shown as a vertex.

  Further, the triangle indicated by the solid line is the vertex coordinates 20R related to the control information of the current red LED 23R changed by the user, the vertex coordinates 20G related to the control information of the green LED 23G, and the vertex coordinates 20B related to the control information of the blue LED 23B. It is said. FIG. 3 shows a state where the vertex coordinates 10B and the vertex coordinates 20B, and the vertex coordinates 10R and the vertex coordinates 20R are both coincident. In the series box 32, explanations of dotted lines and solid lines are displayed. The user can move the vertex coordinates 20R of the red LED 23R, the vertex coordinates 20G of the green LED 23G, or the vertex coordinates 20B of the blue LED 23B by operating a cursor 30 indicated by an arrow from the input unit 26. In the present embodiment, an example of changing the control information of the green LED 23G is shown. When changing the green LED 23G, the user selects the “green adjustment” tab from the menu box 31 shown in FIG. The menu box displays "Adjust green color. Move the desired coordinates with the cursor 30 and press the enter button."

  Thereby, the user can change the coordinates of the vertex coordinates 20G related to the control information of the green LED 23G from the input unit 26. Similarly, when the user changes the vertex coordinates 20R of the red LED 23R, the user clicks the red adjustment tab in the menu box 31 and browses the cursor 30 including the four-direction arrows displayed near the vertex coordinates 20R. The vertex 20G is moved. When the user changes the vertex coordinates 20B of the blue LED 23B, the user clicks the blue adjustment tab in the menu box 31 and moves the cursor 30 formed of an arrow displayed near the vertex coordinates 20B. When the user operates the determination button from the input unit 26, lighting control of the red LED 23R, the green LED 23G, or the blue LED 23B is performed based on the control information corresponding to the coordinate value of the vertex coordinate 20G after the change.

  A procedure for displaying the chromaticity diagram shown in FIG. 3 and other information by the control unit 2 will be described. When setting the red LED 23R, the green LED 23G, or the blue LED 23B, the user operates the input unit 26 to display a menu screen including a chromaticity diagram as shown in FIG. The CPU 21 receives an instruction from the input unit 26 and reads out the chromaticity diagram image data from the chromaticity diagram file 222 stored in the RAM 22. The image data relating to this chromaticity diagram includes the chromaticity diagram, rectangular regions G, R, and B, vertex coordinates 10R, vertex coordinates 10G, and dotted triangles defined by vertex coordinates 10B, as shown in FIG. A cursor 30, a menu box 31, and a series box 32.

  Further, the CPU 21 reads the control information of the current red LED 23R, green LED 23G, and blue LED 23B from the setting file 224, reads the coordinate value corresponding to the read control information from the control information file 221, and the vertex coordinate 20G corresponding to the coordinate value. , 20R, 20B and solid line triangle image data defined by these, image processing for superimposing the image data on the chromaticity diagram described above is performed. The CPU 21 outputs the image data after this image processing to the DMD 11 via the DMD controller 12. As a result, the screen shown in FIG.

  FIG. 4 is an explanatory diagram showing a record layout of the control information file 221. The control information file 221 stores coordinate values in association with control information including the light emission intensity or light emission time of the red LED 23R, the green LED 23G, and the blue LED 23B. The control information file 221 includes a coordinate value field, a current ratio red field, a current ratio blue field, a duty ratio red field, and a duty ratio blue field. In the coordinate value field, coordinate values on the x and y axes on the chromaticity diagram shown in FIG. 3 are stored.

  In the current ratio red field as control information, the ratio when the current value for lighting the red LED 23R in the initial setting state is set to “1” is stored, and when “0.1” is stored, the red value is stored. The LED 23R is lit at a current value obtained by multiplying the initial current value by 0.1. Similarly to the current ratio red field, the current ratio blue field stores the ratio when the current value for turning on the blue LED 23B in the initial setting is “1” as control information. In the duty ratio red field as control information, the ratio when the pulse width for lighting the red LED 23R in the initial setting state is “1” is stored in%, and “10%” is stored. The red LED 23R is turned on with a pulse width of 10%. Similarly, in the duty ratio blue field as control information, the ratio when the pulse width for lighting the blue LED 23B in the initial setting state is “1” is stored in%.

  The example of FIG. 4 stores the control information including the light emission intensity or the light emission time with respect to the coordinate value of the green LED 23G, that is, the current ratio of the red LED 23R and the blue LED 23B, and the duty ratio of the red LED 23R and the blue LED 23B. . In the example of FIG. 4, when the coordinate value of the green LED 23G is (0.18, 0.7), the green LED 23G is in the initial position of the vertex coordinate 10G in the chromaticity diagram shown in FIG. Correspondingly, the current ratio of the red LED 23R and the blue LED 23B is stored as “0”, and the duty ratio of the red LED 23R and the blue LED 23B is also stored as “0”.

  FIG. 5 is a chart showing the control timing of the red LED 23R, the green LED 23G, and the blue LED 23B. FIG. 5A is a chart when the red LED 23R, the green LED 23G, or the blue LED 23B is lit alone, and the green LED 23G is at the initial position of the vertex coordinate 10G. In the chart, the horizontal axis is time, and the vertical axis is current value. Upon receiving the LED ON signal, the LED driver 26D turns on the green LED 23G, and turns off the green LED 23G after a predetermined time has elapsed. Thereafter, the red LED 23R is turned on, and the red LED 23R is turned off after a predetermined time has elapsed. After the red LED 23R is turned off, the blue LED 23B is turned on, and after a predetermined time has elapsed, the blue LED 23B is turned off. The LED driver 26D repeats this operation. As shown in the control information file 221 in FIG. 4, when the green LED 23G is located at the vertex coordinate 10 that is the initial position, the current ratio of the red LED 23R and the blue LED 23B and the duty ratio of the red LED 23R and the blue LED 23B are “0”. Therefore, when the green LED 23G is lit, the red LED 23R and the blue LED 23B are not controlled to be lit.

  On the other hand, when the vertex coordinate 20G of the green LED 23G is moved from the vertex coordinate 10G by an instruction from the user input unit 26, for example, when the vertex coordinate 20G is moved to (0.19, 0.65), Corresponding to the coordinate values of FIG. 4, the current ratio of the red LED 23R is “0.1”, and the current ratio of the blue LED 23B is “0”. The CPU 21 reads the current ratio corresponding to the coordinate value from the control information file 221 and outputs it to the LED driver 26D. In response to this, the LED driver 26D lights up with a current value 0.1 times as large as when the red LED 23R is normally lit when the green LED 23G is lit. Since the current ratio of the blue LED 23B is “0”, simultaneous lighting is not performed. FIG. 5B is a chart when the red LED 23R is turned on in accordance with the lighting of the green LED 23G. As shown in FIG. 5B, it can be understood that the red LED 23R is simultaneously lit in a superimposed manner with a lower peak value in accordance with the lighting of the green LED 23G.

  The LED driver 26D causes the red LED 23R to pass a current that is 0.1 times that during normal lighting at the same timing as the lighting of the green LED 23G. When the green LED 23G is lit, the red LED 23R is lit simultaneously, but the blue LED 23B is not lit simultaneously because the current ratio is “0”. After the green LED 23G and the red LED 23R having a low peak value are turned off, the red LED 23R and the blue LED 23B are sequentially turned on / off. This makes it possible to display the color desired by the user on the screen 15.

  When the user further moves the vertex coordinates 20G of the green LED 23G and the vertex coordinates 20G becomes (0.26, 0.6), the CPU 21 reads the current ratio “0.2” of the corresponding red LED 23R from the control information file 221. The current ratio “0.1” of the blue LED 23B is read out. The CPU 21 outputs the read current ratio to the LED driver 26D. When the green LED 23G is lit based on the output current ratio, the LED driver 26D sets the red LED 23R to the current ratio “0.2” and the blue LED 23B to the current ratio “ At “0.1”, all the colors are simultaneously superimposed and turned on. In addition, although the example which controls by the ratio of the electric current sent to the light source part 23 as light emission intensity was shown, you may make it control the light source part 23 similarly by ratio of the voltage to apply. When the red LED 23R is composed of a plurality of LEDs, the number of LEDs that emit light may be increased or decreased in order to increase or decrease the emission intensity.

  In FIG. 5, the red LED 23R, the green LED 23G, or the blue LED 23B is controlled by increasing / decreasing the peak value, but these may be controlled by increasing / decreasing the duty ratio as the light emission time by PWM (Pulse Width Modulation) control. When the vertex coordinates 20G of the green LED 23G are moved from the vertex coordinates 10G by an instruction from the user input unit 26, for example, when the vertex coordinates 20G are moved to (0.19, 0.65), the coordinate values of FIG. The duty ratio of the red LED 23R is “10%” and the duty ratio of the blue LED 23B is “0%”. The CPU 21 reads the duty ratio corresponding to the coordinate value from the control information file 221 and outputs it to the LED driver 26D. In response to this, the LED driver 26D lights up with the duty ratio of 10% when the red LED 23R is normally lit when the green LED 23G is lit. Since the duty ratio of the blue LED 23B is “0%”, lighting is not performed. FIG. 6 is a chart when the red LED 23R is turned on in accordance with the lighting of the green LED 23G. As shown in FIG. 6, it can be understood that the red LED 23R is simultaneously lit in a superimposed manner with a shorter pulse width in accordance with the lighting of the green LED 23G.

  When the user further moves the vertex coordinate 20G of the green LED 23G and the vertex coordinate 20G becomes (0.26, 0.6), the CPU 21 reads the duty ratio “20%” of the corresponding red LED 23R from the control information file 221 and Read the current ratio “10%” of the blue LED 23B. The CPU 21 outputs the read duty ratio to the LED driver 26D. When the green LED 23G is turned on based on the output duty ratio, the LED driver 26D sets the red LED 23R to the duty ratio “20%” and the blue LED 23B to the duty ratio “10”. % "Lights up all colors simultaneously.

  In this way, the user can visually change the control information of the green LED 23G while looking at the chromaticity diagram, and can similarly change the control information of the red LED 23R and the blue LED 23B. In the present embodiment, the processing for separately controlling the light emission intensity (current ratio, voltage ratio, number of light emission lighting, etc.) or light emission time (duty ratio, etc.) has been described. The red LED 23R, the green LED 23G, or the blue LED 23B may be controlled in combination. Further, in the present embodiment, for the sake of explanation, the processing by the CPU 21 referring to the control information file 221 storing the control information corresponding to the coordinate values of the chromaticity diagram has been described. However, using the mathematical formula stored in the RAM 22, Control information for the coordinate value may be calculated by the CPU 21. For example, the control information for the red LED 23R may be determined according to the distance between the green vertex coordinate 20G and the initial red vertex coordinate 10R. In this case, a mathematical formula may be used in which the emission intensity or emission time increases asymptotically as the green vertex coordinate 20G approaches the red vertex coordinate 10R. Also for the blue vertex coordinates 10B, a mathematical formula for changing the control information in accordance with the distance from the green vertex coordinates 20G may be used.

  FIG. 7 is a flowchart showing a procedure for outputting a chromaticity diagram. When the user adjusts the color of the projector 1, the user operates a menu button (not shown) of the input unit 26. CPU21 receives the display request of the menu input from the input part 26 (step S71). In response to this, the CPU 21 reads out the image data of the chromaticity diagram shown in FIG. 3 from the chromaticity diagram file 222 (step S72). This read image data includes a semi-elliptical color chromaticity diagram including coordinate axes, initial vertex coordinates 10G, 10B and 10R, dotted dotted triangles formed by these, rectangular G region, B region, R An area, a series box 32, and a menu box 31 are included. The CPU 21 outputs the read chromaticity diagram image data to the DMD 11 via the DMD controller 12 (step S73). The output image data of the chromaticity diagram is displayed on the screen 15. When image data other than the chromaticity diagram is input from the separation signal input unit 17 or the composite signal input unit 18, the image data of the chromaticity diagram is superimposed on this image data and then superimposed on the DMD 11. The combined image data is output.

  The CPU 21 reads the control information of the current red LED 23R, green LED 23G, and blue LED 23B from the setting file 224 (step S74). As this control information, control information such as light emission intensity or light emission time of the other two color LEDs when one color LED is lit is stored. The CPU 21 reads coordinate values corresponding to the read control information from the control information file 221 (step S75). For example, when the green vertex coordinate 20G is determined, the current ratio of the red LED 23R and the current ratio of the blue LED 23B are read out, and the CPU 21 reads out the coordinate value of the green LED 23G provided with the AND condition from the control information file 221. Similarly, the vertex coordinates 20R of the red LED 23R and the vertex coordinates 20B of the blue LED 23B can be determined. Note that the coordinate values of the vertex coordinates 20G, 20R, and 20B changed by the user operating from the input unit 26 may be sequentially stored in the setting file 224 and read out.

  The CPU 21 outputs corresponding image data to the DMD 11 based on the read coordinate value (step S76). The CPU 21 generates and outputs to the DMD 11 a point of each coordinate of the read vertex coordinates 20G, 20R, and 20B and a solid triangle image formed by each point. As a result, the image data of the chromaticity diagram output in step S73 is displayed on the screen 15 with the solid line triangle and the image of each point of the vertex coordinates 20G, 20R, and 20B of the current red LED 23R, green LED 23G, and blue LED 23B. It is displayed on the screen 15 as control information.

  The user selects a tab of the color desired to be adjusted while looking at the menu box 31. The CPU 21 accepts this color selection from the input unit 26 (step S77). The CPU 21 outputs the image data of the cursor 30 including the four-direction arrows stored in the RAM 22 to the DMD 11 near the vertex coordinates of the received color (step S78). For example, in the example of FIG. 3, since the user has requested a change in the control information of the green LED 23G, the CPU 21 outputs image data so that the cursor 30 is displayed near the green vertex coordinates 20G.

  FIG. 8 is a flowchart showing a procedure for changing the control information. When changing the control information of a specific color LED, the user moves the coordinates of the vertex while looking at the cursor 30 from the input unit 26. The CPU 21 receives the changed coordinate value from the input unit 26 (step S81), and stores the received changed coordinate value in the setting file 224 (step S82). Along with this processing, the CPU 21 generates solid line triangle image data composed of the vertex coordinates of the changed color and other vertex coordinates, and outputs the image data to the DMD 11. The CPU 21 searches the control information file 221 based on the coordinate values after the change, and reads the control information of the corresponding other color LED (step S83).

  The CPU 21 stores the changed control information in the setting file 224 in association with the coordinate value stored in step S82 (step S84). The CPU 21 outputs the changed control information to the LED driver 26D (step S85). The LED driver 26D controls each LED according to the changed control information (step S86). By performing the processing described above for each color, the user can visually change the control information of the red LED 23R, the green LED 23G, or the blue LED 23B while referring to the chromaticity diagram.

  Subsequently, a control procedure between the sensor 24 and the control unit 2 will be described. The lightness detected from the sensor 24 is output to the CPU 21 as digital data consisting of, for example, 8-bit lightness gradation. The CPU 21 refers to the luminance file 223 and performs control to increase or decrease the emission intensity or emission time of the red LED 23R, the green LED 23G, and the blue LED 23B based on the output brightness.

  FIG. 9 is an explanatory diagram showing a record layout of the luminance file 223. The luminance file 223 includes a brightness / luminance field and a voltage ratio field. In the lightness / luminance field, the lightness or luminance is stored in 256 gradations. The lower the numerical value, the darker, and the higher the numerical value, the brighter. In the voltage ratio field, the ratio of the voltage applied to each LED is stored in association with the brightness. When the voltage ratio is “1.0”, the initial setting voltage is applied to the red LED 23R, the green LED 23G, and the blue LED 23B. Applied.

  The voltage ratio is stored so that the voltage ratio decreases as the brightness or luminance decreases, in other words, the applied voltage decreases as it becomes darker. On the other hand, the voltage ratio is stored such that the voltage ratio increases as the brightness or luminance increases, in other words, the applied voltage increases as the brightness increases. The CPU 21 reads out the voltage ratio corresponding to the brightness output from the sensor 24 from the luminance file 223, and outputs information on the voltage ratio to the LED driver 26D. The LED driver 26D applies a voltage obtained by multiplying the voltage applied to the red LED 23R, the green LED 23G, or the blue LED 23B by a voltage ratio in the initial setting. In the present embodiment, the voltage ratio, which is the emission intensity, is increased or decreased. However, the current ratio or the number of LEDs to be lit may be increased or decreased. Furthermore, the light emission time may be increased or decreased by PWM control.

  FIG. 10 is a flowchart showing a control procedure for the light source unit 23 based on the output of the sensor 24. The sensor 24 measures the ambient brightness and outputs it to the CPU 21 (step S101). The CPU 21 searches the luminance file 223 based on the output brightness, and reads the voltage ratio corresponding to the brightness (step S102). The CPU 21 outputs the read voltage ratio to the LED driver 26D (step S103). The LED driver 26D controls each of the red LED 23R, the green LED 23G, and the blue LED 23B based on the output voltage ratio (step S104).

  Next, a processing procedure between the average luminance calculation circuit 25 and the control unit 2 will be described. The average luminance calculation circuit 25 calculates the average luminance of all the pixels in one frame of the image data output from the input switching unit 16. The calculated average luminance is output to the CPU 21 as digital data composed of, for example, 8-bit luminance gradation. In the present embodiment, the average luminance is calculated for each frame, but the average luminance of several frames of image data may be calculated and output. The CPU 21 refers to the luminance file 223 and performs control to increase / decrease the light emission intensity or light emission time of the red LED 23R, the green LED 23G, and the blue LED 23B based on the output average luminance. In the same way as the control related to the brightness output from the sensor 24, the control is performed so that the emission intensity such as the voltage ratio increases when the average brightness is high, and the emission intensity such as the voltage ratio is decreased when the average brightness is low. Control as follows.

  FIG. 11 is a flowchart showing a control procedure for the light source unit 23 based on the output of the average luminance calculation circuit 25. The average luminance calculation circuit 25 calculates the average luminance of one frame of image data (step S111). The average luminance calculation circuit 25 outputs the calculated average luminance to the CPU 21 (step S112). The CPU 21 searches the luminance file 223 based on the output average luminance, and reads the voltage ratio corresponding to the average luminance (step S113). The CPU 21 outputs the read voltage ratio to the LED driver 26D (step S114). The LED driver 26D controls each of the red LED 23R, the green LED 23G, and the blue LED 23B based on the output voltage ratio (step S115). This makes it possible to display an image with enhanced contrast according to the surrounding situation or the brightness of image data.

Embodiment 2
FIG. 12 is a chart showing control timings of the red LED 23R, the green LED 23G, and the blue LED 23B according to the second embodiment. In the invention according to the second embodiment instead of the ND green filter used in the color wheel, the green LED 23G is turned on or off in a stepwise manner so as to reach a predetermined emission intensity. As shown in FIG. 12, the normal LED driver 26D controls the lighting of the green LED 23G with the light emission intensity indicated by the peak value Y. In addition to this control, the LED driver 26D performs the lighting control of the green LED 23G with the peak value Y / 2 for a predetermined time at the rising of the peak of the lighting. After the predetermined time has elapsed, control is performed so that the normal peak value Y is obtained. With this configuration, it is possible to reduce the bit diffusion noise in the low luminance region, and since no filter is used, the linearity can be improved without losing the color balance.

  In the example of FIG. 12, the control for lighting for a predetermined time when the peak value is Y / 2 is performed. However, for example, the control for lighting for a predetermined time at the peak value Y / 5 is performed until the peak value Y is reached. It may be performed a plurality of times. In the present embodiment, the lighting control of the green LED 23G is described. However, the same control may be performed for the red LED 23R and the blue LED 23B.

  FIG. 13 is a chart showing control timing of other red LEDs 23R, green LEDs 23G, and blue LEDs 23B according to the second embodiment. As shown in FIG. 13, the green LED 23G may be turned off step by step until the peak value 0 is reached. That is, the LED driver 26D turns on the green LED 23G at the peak value Y and then lights it for a predetermined time at the peak value Y / 2 before reaching the peak value 0, and then turns off the green LED 23G. In this case as well, the bit diffusion noise in the low luminance region can be reduced by turning off the light step by step as in the case of lighting.

  In the present embodiment, the mode in which the light is turned on or off in stages is shown. However, the light may be turned on and off in steps at both the time of turning on and off. Furthermore, as shown in FIG. 13, control may be performed so that the red LED 23R and the blue LED 23B described in the first embodiment are turned on simultaneously when the green LED 23G is turned on.

  The second embodiment is configured as described above, and the other configurations and operations are the same as those of the first embodiment. Therefore, corresponding parts are denoted by the same reference numerals, and detailed description thereof is omitted.

It is a block diagram which shows the hardware constitutions of the projector which concerns on this invention. It is a block diagram which shows the hardware constitutions of a control part. It is explanatory drawing which shows the chromaticity diagram displayed on a screen, and the control information of a light source part. It is explanatory drawing which shows the record layout of a control information file. It is a chart figure which shows the control timing of red LED, green LED, and blue LED. It is a chart figure at the time of making red LED light according to lighting of green LED. It is a flowchart which shows the procedure at the time of outputting a chromaticity diagram. It is a flowchart which shows the procedure at the time of changing control information. It is explanatory drawing which shows the record layout of a brightness | luminance file. It is a flowchart which shows the control procedure with respect to the light source part based on the output of a sensor. It is a flowchart which shows the control procedure with respect to the light source part based on the output of an average luminance calculation circuit. FIG. 6 is a chart showing control timings of a red LED, a green LED, and a blue LED according to the second embodiment. It is a chart figure which shows the control timing of other red LED concerning Embodiment 2, green LED, and blue LED.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Projector 2 Control part 11 DMD (spatial light modulation part)
12 DMD controller 13 Field lens 14 Projection lens 15 Screen 21 CPU
22 RAM
23 Light source 23R Red LED
23G green LED
23B Blue LED
24 sensor 25 average luminance calculation circuit 26 LED driver

Claims (8)

In a projector having a control unit that controls lighting of a plurality of light source units, and a spatial light modulation unit that modulates light from the light source units according to image data,
Chromaticity diagram output means for outputting image data relating to a chromaticity diagram stored in advance to the spatial modulation unit;
Control information output means for outputting image data corresponding to the chromaticity diagram relating to control information of a plurality of light source units set by the control unit to the spatial modulation unit;
Receiving means for receiving information for changing the control information;
A projector comprising: change control means for controlling lighting of the light source unit based on the received control information after change. The control information output means includes
A file storing coordinate values on the chromaticity diagram in correspondence with control information including emission intensity or emission time of each light source unit;
Means for reading out coordinate values on the chromaticity diagram stored in the file corresponding to the control information of each light source unit set in the control unit;
The projector according to claim 1, further comprising: means for outputting image data corresponding to a coordinate value on the read chromaticity diagram to the spatial modulation unit. The accepting unit is configured to accept the coordinate value after change with respect to the coordinate value output by the control information output unit as control information after change,
The change control means is configured to read control information after change from the file based on the coordinate value after change, and to control the light source unit based on the read control information after change. The projector according to claim 2.   The projector according to claim 1, wherein the control unit is configured to turn on another light source unit with a predetermined light emission intensity when one light source unit is turned on.   The projector according to claim 1, wherein the control unit is configured to turn on another light source unit for a predetermined time when one light source unit is turned on.   6. The projector according to claim 1, wherein the control unit is configured to turn on or off one light source unit so as to reach a predetermined light emission intensity in a stepwise manner. A sensor for detecting ambient brightness;
7. The projector according to claim 1, further comprising: a unit that increases or decreases a light emission intensity or a light emission time of the light source unit by the control unit based on the brightness detected by the sensor. Means for calculating the average luminance of the image data;
The projector according to any one of claims 1 to 6, further comprising: means for increasing or decreasing a light emission intensity or a light emission time of the light source unit by the control unit based on the calculated average luminance.

Images