JP2016184086A - Projection type display device and light source control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection type display device that converges quickly relative to a plurality of target luminances even if the accumulative lighting time of a light source is long, or a light source control method for the projection type display device.SOLUTION: A projection type display device 10 includes: a light source 11; a light source driving unit 12 that supplies light source driving power to the light source 11; a luminance detection unit that detects the detection luminance corresponding to the light output from the light source 11; a storage unit 19 that stores the light source characteristic representing the relation between the light source driving power and the accumulative lighting time including the accumulated time for which the light source 11 is lighted for every target luminance targeted when the light source 11 is lighted; and a control unit 20 that controls the light source driving unit 12 so that when the light source 11 is lighted, the difference between the detection luminance and the target luminance becomes smaller than a predetermined value.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a projection display device and a light source control method, and more particularly to a technique for projecting a projected image with appropriate brightness.

  Movies and the like are shown using a projection display device such as a projector. The projector projects and displays an image on a projection surface. The projector includes a lamp such as an ultra-high pressure mercury lamp or a xenon lamp as a light source for projecting an image. In the screening of movies and the like, it is desirable to adjust the screen brightness of the projected image projected from the projector in accordance with the content to be screened, and to display the content with appropriate brightness (luminance).

  The screen brightness of the projector is adjusted by adjusting the output brightness of a lamp used as a light source. The projector includes a brightness sensor that detects the output brightness of the lamp, a control unit, and a storage unit. The storage unit stores the target luminance of the lamp corresponding to the screen luminance in order to obtain the screen luminance desired by the user. When the control unit receives an instruction to turn on the lamp, after supplying the light source driving power to light the lamp, the control unit outputs the lamp output luminance detected using the luminance sensor and the lamp target luminance stored in the storage unit. The driving power of the lamp (light source driving power) is controlled so that.

  For example, a case where content Cx is screened will be described. The user adjusts the output luminance of the projector for the content Cx to be shown. The user arranges a luminance sensor for detecting the screen luminance near the projection surface on which an image is projected, for example, near the center of the screen, and adjusts the output luminance of the lamp so as to obtain the optimal screen luminance for the content Cx. When the optimum screen brightness is adjusted, the user stores the detected brightness detected using the brightness sensor that detects the output brightness of the lamp at this time in the storage unit as the target brightness. When the lamp is turned on, the projector adjusts the detected brightness detected using the brightness sensor so as to match the target brightness stored in the storage unit, and screens the content Cx.

  Further, Patent Document 1 records a cumulative lighting time that is a cumulative value of a lighting time from the start of lamp use, and stores light emission characteristic data and a cumulative value indicating a temporal change from the start of use of the lamp to the end of use. It describes that brightness deterioration due to a change with time is corrected by controlling the brightness of the lamp based on the information of the lighting time. Further, the light emission characteristic data of a plurality of types of lamps are stored as respective power correction tables A, B, and C, the type of the lamp is identified by the illumination identification unit, and the power correction tables A, B, It is described that optimal control is performed for various types of lamps by switching C.

JP-A-2005-241708

  In general, it is known that the characteristics of a lamp change according to the lighting time of the lamp. For example, it is known that when the cumulative lighting time, which is the cumulative value of the lighting time from the start of use of the lamp, becomes long, the output luminance of the lamp decreases even when driven using the same light source driving power. In this case, in order to obtain a constant screen luminance, it is necessary to increase the light source driving power relative to the initial light source driving power. FIG. 7 shows an example of the relationship between the cumulative lighting time and the light source driving power of the lamp when a predetermined lamp is used to light up to a constant screen luminance. The horizontal axis indicates the cumulative lighting time (unit: time), and the vertical axis indicates the light source driving power (unit: W).

  In other words, when the brightness (output brightness) output from the light source is detected and the screen brightness is controlled to be kept constant at a predetermined value, the output brightness that matches the target brightness when the cumulative lighting time of the lamp (light source) becomes longer. There was a problem that it took time to become. This is because the difference between the preset initial value of the light source driving power supplied to the lamp and the light source driving power for obtaining the target luminance becomes large.

  Further, in Patent Document 1, luminance deterioration due to change over time is corrected by controlling the brightness of the lamp based on the light emission characteristic data indicating change over time and the accumulated lighting time information. However, the lamp emission characteristic data stored in advance is corrected. Stores and specifies in advance the mode for bright projection or when energy saving is important, and is different from the screen brightness desired by the user. In particular, in the screening of movies and the like, it is desired that the screen brightness of a projected image projected from a projector is adjusted according to the content to be screened, and the content is screened at an appropriate brightness. Therefore, in the technique described in Patent Document 1, in order to keep the screen brightness adjusted for each content constant, light emission characteristic data corresponding to all brightnesses of all types of usable lamps is stored in advance. It is necessary to keep. In this case, a very large memory is required.

  The present invention pays attention to the above-described problem, and an object thereof is to quickly converge a plurality of target luminances even when the cumulative lighting time of a light source becomes long.

In order to achieve the above object, the projection display apparatus of the present invention provides:
A light source;
A light source driving unit for supplying light source driving power to the light source;
A luminance detection unit for detecting a detection luminance corresponding to the light output from the light source;
A storage unit that stores a light source characteristic indicating a relationship between a cumulative lighting time obtained by accumulating a time during which the light source is turned on and the light source driving power for each target luminance that is a target when the light source is turned on,
A control unit that controls the light source driving unit so that a difference between the detected luminance and the target luminance is smaller than a predetermined value when the light source is turned on.

In order to achieve the above object, the light source control method of the present invention includes:
Supply light source drive power to the light source,
Detecting a detection luminance corresponding to the light output from the light source;
For each target luminance that is a target when the light source is turned on, a light source characteristic indicating a relationship between the cumulative lighting time obtained by accumulating the time during which the light source is turned on and the light source driving power is stored,
When the light source is turned on, the light source driving unit is controlled so that a difference between the detected luminance and the target luminance is smaller than a predetermined value.

  According to the present invention, since the light source characteristics corresponding to a plurality of target luminances are stored, even if the cumulative lighting time of the light source becomes long, it can be quickly converged with respect to each target luminance.

1 is a block diagram illustrating a configuration of a projection display device according to a first embodiment of the present invention. It is a flowchart which shows an example of the process sequence of the projection type display apparatus which concerns on the 1st Embodiment of this invention. It is a figure which shows an example of the light source characteristic when it makes it light so that it may become fixed screen brightness using the predetermined light source 11 concerning the 1st Embodiment of this invention. It is a block diagram which shows the structure of the projection type display apparatus which concerns on the 2nd Embodiment of this invention. It is a block diagram which shows the structure of the projection type display apparatus which concerns on the 3rd Embodiment of this invention. It is a figure which shows an example of the light source characteristic when it makes it light so that it may become fixed screen brightness using the predetermined light source 11 concerning the 1st Embodiment of this invention. It is a figure which shows an example of the light source characteristic when it makes it light so that it may become a fixed screen brightness | luminance using a predetermined light source.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, in this specification and drawing, the description which overlaps by the same code | symbol may be attached | subjected about the component which has the same function.
(First embodiment)
FIG. 1 is a block diagram showing a configuration of a projector 10 which is a projection display device according to the first embodiment of the present invention. The projector 10 is an example of a video display device. The projector 10 includes a light source 11, a light source drive unit 12, an illumination optical unit 13, a signal input unit 14, a video processing unit 15, a display drive unit 16, a display unit 17, a projection optical unit 18, and a storage. The unit 19 and the control unit 20 are included.

  The light source 11 is a lamp such as an ultra-high pressure mercury lamp or a xenon lamp. The light source 11 outputs light for displaying an image in accordance with the supplied light source driving power. The type of the light source 11 may be classified using a rated power in addition to the type based on the material such as an ultra-high pressure mercury lamp or a xenon lamp.

  The light source driving unit 12 supplies predetermined light source driving power to the light source 11. The light source driving unit 12 drives the light source 11.

  The illumination optical unit 13 irradiates the display unit 17 with the light output from the light source 11. The illumination optical unit 13 includes a luminance sensor 131. The luminance sensor 131 is disposed between the light source 11 and the display unit 17 and detects a detection luminance corresponding to light (output luminance) output from the light source 11. The luminance sensor 131 is an example of a luminance detection unit.

  The signal input unit 14 receives a video signal and outputs the input video signal to the video processing unit 15. The signal input unit 14 may receive a plurality of video signals, select any one of the input video signals, and output the selected video signal to the video processing unit 15 which is a subsequent block. Further, the signal input unit 14 may convert a video signal of a predetermined format corresponding to the HDMI (registered trademark) standard or the like into a video signal of another format suitable for processing by the subsequent block. .

  The video processing unit 15 performs various types of signal processing on the input video signal and outputs the processed signal to the display driving unit 14. The signal processing performed by the video processing unit 15 includes, for example, a resolution conversion process for converting the resolution of the input video signal to the resolution of the display element, a color correction process for correcting the input video signal to an appropriate color, and an appropriate luminance for the input video signal. Gamma correction processing for converting to a trapezoidal distortion and trapezoidal distortion correction processing for correcting trapezoidal distortion that occurs when projected onto the projection surface from an oblique direction.

  The display driving unit 16 drives the display unit 17 based on the input video signal.

  The display unit 17 includes a liquid crystal panel, which is a display element, or a DMD (Digital Micromirror Device). The display unit 17 modulates the light emitted from the illumination optical unit 13 in accordance with the driving of the display driving unit 16 and outputs the modulated light to the projection optical unit 18.

  The projection optical unit 18 projects the light modulated by the display unit onto a projection surface such as a screen. That is, the projection optical unit 18 projects an image on the projection surface. The projection optical unit 18 includes a projection lens and a projection mirror that project an image.

  The display unit 17 may include, for example, three display elements corresponding to red, green, and blue. In this case, the illumination optical unit 13 separates the light emitted from the light source 11 into red, green, and blue light, and irradiates the separated light to the display elements corresponding to the respective lights. Further, the display unit 17 or the projection optical unit 18 synthesizes the light modulated by the display element.

  The display unit 17 may include, for example, one display element. In this case, the illumination optical unit 13 temporally separates the light emitted from the light source 11 into red, green, and blue light (time division) and irradiates the display device with the separated light. The light irradiated to the display element is modulated based on the video signal corresponding to each light.

  The storage unit 19 stores a program for operating the control unit 20. In addition, the storage unit 19 stores light source characteristics indicating a relationship between the cumulative lighting time obtained by accumulating the time during which the light source is turned on and the light source driving power for each target luminance that is a target when the light source is turned on. The storage unit 19 stores the cumulative lighting time of the light source. Further, the storage unit 19 stores a target luminance when the light source is turned on. In addition, you may make it instruct | indicate the target brightness | luminance when turning on a light source, when the user of a display apparatus turns on a light source.

  The target brightness is a detected brightness corresponding to the screen brightness on the projection surface. For example, the detected brightness when the screen brightness on the projection surface is 30000 lumens is set as the target brightness of screen brightness = 30000 lumens.

  The control unit 20 transmits / receives signals (information) to / from each unit of the projector 10 and controls the operation of the projector 10. When the light source 11 is turned on, the control unit 20 sets the light source driving power based on the light source characteristics stored in the storage unit 19. In addition, when the light source 11 is turned on, the control unit 20 controls the light source driving unit 12 so that the difference between the detected luminance detected by the luminance sensor 131 and the target luminance becomes smaller than a predetermined value.

  Next, the operation of the present embodiment will be described with reference to FIGS. In the present embodiment, a case where contents Ca, Cb, and Cc are screened will be described. Note that the appropriate screen brightness of the content Ca is 30000 lumens (hereinafter, the lumen may be described as lumen or lm). Further, the appropriate screen luminances of the contents Cb and Cc are 25000 lumens and 22000 lumens, respectively. Further, target luminances corresponding to the contents Ca, Cb, and Cc are set as target luminances Ya, Yb, and Yc, respectively.

  FIG. 2 is a flowchart illustrating an example of a processing procedure according to the present embodiment.

  FIG. 3 is a diagram showing ideal light source characteristics (relationship between cumulative lighting time and light source driving power) when a predetermined light source 11 is used to light up to a constant screen luminance. In addition, the drive power of the light source when the screen brightness is turned on at 30000 lumens, 25000 lumens, and 22000 lumens is indicated by dotted lines (La, Lb, Lc).

  Table 1 is a table (look-up table) showing the relationship between the cumulative lighting time and the light source driving power when a predetermined light source 11 is used to light up to a constant screen luminance, and shows the light source characteristics. It is. The relationship between the cumulative lighting time and the light source driving power shown in Table 1 corresponds to the black circle points (P1, P2,... Pn) in FIG. The driving power of the light source 11 when it is lit at a certain screen brightness depends on the driving power value up to that time as well as the cumulative lighting time, so that the actual driving power (black circle) and the ideal light source characteristic (dotted line) match. Not exclusively.

  Initially, when the projector 10 is powered on, the projector 10 shifts to a standby state. The standby state is a state where the light source 11 is not lit. When the control unit 20 detects an instruction indicating lighting of the light source 11 in the standby state (step S10: Yes), the control unit 20 determines whether or not the light source characteristic stored in the storage unit 19 is valid (step S11). It should be noted that the light source characteristic is determined to be valid when valid information is stored as the light source characteristic. It is assumed that the light source characteristics are not valid (invalid) in the initial state of the projector 10. In other words, the initial state of the projector 10 is a state in which information effective as light source characteristics is not stored. Note that the initial state of the projector 10 may be a state in which valid information is stored.

  In step S11, when it is determined No (the light source characteristic is invalid), the control unit 20 acquires a target luminance stored in advance in the storage unit 11 as an initial value (step S14), and the storage unit 11 as an initial value. Is set in the light source drive unit 12 (step S15), and the process proceeds to step S16. The light source driving unit 12 supplies the set light source driving power to the light source 11. The light source driving unit 12 drives (lights) the light source 11. Note that the state in which the light source 11 is turned on is the video display state with respect to the standby state.

  The initial state of the projector 10 may be a state in which typical light source characteristics of the light source 11 are stored. In this case, steps S11, S14, and S15 can be deleted. In step S12, the target luminance stored in advance in the storage unit 11 as an initial value is acquired, and the light source driving power is calculated based on the representative light source characteristics. Is set to 12 (step S13).

  If it is determined that the light source characteristic is valid in step S11, the control unit 20 acquires the target luminance when the light source 11 is turned on (step S12). Next, the control unit 20 sets the light source driving power corresponding to the acquired target luminance in the light source driving unit 12 based on the current accumulated lighting time and the light source characteristics of the light source 11 (step S13), and proceeds to step S16. To do. The target luminance when the light source 11 is turned on is the initial value or the target luminance selected when the light source 11 was previously turned off. Further, the target luminance when the light source 11 is turned on may be a target luminance corresponding to the content name by selecting the content name when the content is screened.

Specifically, when the information corresponding to the current cumulative lighting time of the light source 11 and the target luminance has light source characteristics, the control unit 20 sets the light source driving power based on the information corresponding to the current cumulative lighting time. For example, when displaying the content Ca, it is assumed in Table 1 that information on the accumulated lighting time t _k = 100 hours corresponding to the content Ca (target luminance Ya) is stored as the light source characteristic. Also, assuming that the current cumulative lighting time of the light source 11 is 100 hours, the sample driving power P (t _k ) = corresponding to the target luminance = Ya lumen and the cumulative lighting time t _k = 100 hours corresponding to the content Ca = 6830 [W] is set to the current light source driving power as the target driving power.

Also, if there is no information corresponding to the cumulative lighting time and the target brightness that is greater than or equal to the current cumulative lighting time, and there is information corresponding to the cumulative lighting time and the target brightness that is shorter than the current cumulative lighting time, it is shorter than the current cumulative lighting time. The light source driving power is set based on information corresponding to the cumulative lighting time and the target luminance. Specifically, the light source driving power corresponding to the cumulative lighting time immediately before the current cumulative lighting time is acquired as the sample driving power, and the sample driving power is set as the target driving power to the current light source driving power. For example, when displaying the content Cb, in Table 1, information corresponding to the content Cb (target luminance Yb) corresponding to the content Cb (target luminance Yb) is stored up to 460 hours, and information after 460 hours is stored. Suppose not. Further, when the current accumulated lighting time of the light source 11 is assumed to be 470 hours, specimens drive corresponding to the target luminance = Yb lumens, the accumulated lighting time _t k-1 = 460 hour immediately preceding the cumulative lighting time _t k = 470 h The power P (t _k−1 ) = 5791 [W] is set as the target drive power P (t _k ) and is set as the current light source drive power.

Further, the sample driving power that is the light source driving power corresponding to the two previous cumulative lighting times with respect to the current cumulative lighting time is acquired, and the relationship between the cumulative lighting time and the light source driving power of the acquired sample driving power is shown. The light source driving power obtained on the extension of the straight line connecting two points on the graph may be set as the current light source driving power as the target driving power. For example, when displaying the content Cb, in Table 1, information corresponding to the content Cb (target luminance Yb) corresponding to the content Cb (target luminance Yb) is stored up to 460 hours, and information after 460 hours is stored. Suppose not. Also, assuming that the current cumulative lighting time of the light source 11 is 470 hours, the two points of cumulative lighting time t _k−2 = 360 hours and t immediately before the target luminance = Yb lumen and the cumulative lighting time t _k = 470 hours. _The sample drive powers corresponding to _k−1 = 460 hours are P (t _k−2 ) = 5763 [W] and P (t _k−1 ) = 5791 [W]. From these, the target driving power P (t _k ) = 5794 [W] corresponding to the cumulative lighting time t _k = 470 hours is calculated and set as the current light source driving power.

If there is no information corresponding to the current cumulative lighting time and target brightness, and there is information corresponding to the cumulative lighting time shorter than the current cumulative lighting time and longer cumulative lighting time and target brightness, the current cumulative lighting time The light source driving power is set based on information corresponding to the shorter cumulative lighting time, the cumulative lighting time longer than the current cumulative lighting time, and the target luminance. For example, the cumulative lighting time and the light source driving power immediately before and after the current cumulative lighting time are acquired, linear interpolation is performed, and the current light source driving power corresponding to the current cumulative lighting time is set. For example, when displaying the content Cb, it is assumed in Table 1 that the current cumulative lighting time of the light source 11 is 400 hours. The sample driving power corresponding to the target lighting = Yb lumen and the cumulative lighting time t _k−1 = 360 hours immediately before the cumulative lighting time t _k = 400 hours is P (t _k−1 ) = 5763 [W]. The sample driving power corresponding to the cumulative lighting time t _{k + 1} = 460 hours immediately after the cumulative lighting time t _k = 400 hours is P (t _{k + 1} ) = 5791 [W]. From these, the target driving power P (t _k ) = 5774 [W] corresponding to the cumulative lighting time t _k = 400 hours is calculated and set as the current light source driving power. Here, _k and _k-1 of the symbols t _k and t _k−1 mean subscripts to t, and t _k−1 is one time earlier corresponding to the same target luminance with respect to t _k . Means information. Further, the symbol t _{k + 1} means information that is one after t _k .

  By setting the light source driving power as described above, for example, when the light source 11 is used for the lifetime of the light source 11 and then replaced with a new light source 11, the projector can perform an appropriate operation. That is, this is particularly effective when the same type of light source 11 is used under the same condition after the light source characteristic is created by operating using the predetermined light source 11.

  The light source 11 is driven using the light source driving power set by the control unit 20. When the light source 11 is turned on, the control unit 20 starts measuring the lighting time of the light source 11 and also uses the past cumulative lighting time of the light source 11 stored in the storage unit 19 and the current lighting time. The lighting time is measured (step S16). The control unit 20 updates the cumulative lighting time of the light source 11 stored in the storage unit 19 every predetermined time, for example, every 10 minutes. In addition, when the continuous lighting time during which the light source 11 is continuously turned on is short, the update interval of the cumulative lighting time can be set sufficiently shorter than the continuous lighting time to reduce the error in the cumulative lighting time. Alternatively, the cumulative lighting time of the light source 11 may be updated when the light source 11 is turned off.

  When the light source 11 is turned on, the control unit 20 acquires the detected luminance corresponding to the output luminance of the light source 11 using the luminance sensor 131 provided in the illumination optical unit 13 (step S17). Further, the control unit 20 controls the light source driving unit 12 based on the detected luminance detected by the luminance sensor 131 and the target luminance acquired from the storage unit 19. The light source drive unit 12 adjusts the light source drive power based on an instruction from the control unit 20 (step S18). For example, the control unit 20 compares the target luminance and the detected luminance, and when the luminance difference becomes larger than a predetermined value, the control unit 20 controls the light source driving unit 12 so that the luminance difference becomes smaller than the predetermined value (adjustment is performed). Start). Specifically, when the luminance difference is larger than a predetermined value and the target luminance is larger than the detected luminance, the light source driving power is increased, and when the target luminance is smaller than the detected luminance, the light source driving power is decreased. When the luminance difference is smaller than a predetermined value, the adjustment process is terminated. The control unit 20 adjusts the output luminance of the light source 11 via the light source driving unit 12 and adjusts the difference between the detected luminance and the target luminance to be smaller than a predetermined value as luminance adjustment processing. Note that the predetermined value at the end of the brightness adjustment process may be different from the predetermined value at the start. In this case, it is desirable that the predetermined value at the end of the brightness adjustment process is smaller than the predetermined value at the start.

  Thereafter, the control unit 20 repeats the processing from step S17 to step S18. However, after the light source characteristic storing process for storing the light source characteristics in the storage unit 19 in the previous time, a predetermined time, for example, 100 hours elapses (step S19). : Yes), the light source characteristics are added and stored in the storage unit 19 (light source characteristic storage processing is executed) (step S20). If the luminance difference obtained in step 18 is larger than a predetermined value, the light source characteristic storage processing may be performed after performing the luminance adjustment processing.

  That is, when the control unit 20 detects an instruction to turn on the light source 11, the control unit 20 turns on the light source 11 based on the target luminance when turning on the light source 11, the cumulative lighting time of the light source 11, and the light source characteristics. Specifically, for example, when the light source is turned on, the control unit uses the light source characteristic corresponding to the target luminance when the light source is turned on, and uses at least two immediately preceding current accumulated lighting times. The sample driving power corresponding to the cumulative lighting time or the cumulative lighting time immediately before and after is obtained. A target drive power corresponding to the current cumulative lighting time is obtained using the obtained sample drive power, and the light source drive unit is caused to light using the obtained target drive power. In addition, when the light source 11 is turned on, the control unit 20 controls the light source driving unit 12 so that the difference between the detected luminance detected by the luminance sensor 131 and the target luminance becomes smaller than a predetermined value.

  Next, a process for storing the light source characteristics will be described with a specific example.

  In the initial state of the projector 10, the light source characteristic is in a state in which valid information is not stored. First, for the content Ca to be screened, the screen brightness of the projected video of the projector 10 is adjusted according to the user's operation. Note that the user's operation is performed via an operation unit including buttons provided on the projector 10 and a remote controller for operating the projector 10. Specifically, a brightness sensor (not shown) for detecting screen brightness is arranged near the center of the projection surface for projecting an image, and the output brightness of the light source 11 is set so that the screen brightness is appropriate for the content Ca. It is adjusted according to the operation. The following adjustment shall be performed promptly. When the screen luminance is adjusted to an appropriate value (30000 lumens), the control unit 20 detects the detection luminance (corresponding to the output luminance of the light source 11 at this time in accordance with a user operation, for example, an operation indicating storage of the adjustment value. = Ya), the accumulated lighting time and the light source driving power are associated with each other and stored in the storage unit 19 as light source characteristics. The detected brightness at this time becomes the target brightness. This corresponds to the point P1 in FIG. 3, and as shown in Table 1, corresponding to the content Ca (target luminance = Ya [lumen]), the cumulative lighting time = 0 [hour], the target light source driving power = It is stored as 6800 [W]. At this time, the content name (content Ca) and various values corresponding to the output luminance of the light source 11 (target luminance = Ya [lumen], cumulative lighting time, target light source driving power) are stored in association with each other. The information stored at this time is an example of the light source characteristic indicating the relationship between the cumulative lighting time and the light source driving power. The light source characteristics are managed for each type of light source 11 and luminance of the light source 11. The process of storing the light source characteristics is an example of a light source characteristic storage process. When the light source characteristic is stored, it is determined that the light source characteristic is valid.

  Thereafter, the projector 10 is supposed to screen the content Ca.

  When a predetermined time, for example, 100 hours elapses after the previous light source characteristic storage process, the control unit 20 stores the current cumulative lighting time and light source driving power in the storage unit 19 (executes the light source characteristic storage process). ). For example, if the previous light source characteristic storage process is performed when the cumulative lighting time t = 0 [hour] and the content Ca is screened, the control unit 20 causes the cumulative lighting time t ≧ 100 [hour] = 0 + 100 = ( When the time of the previous light source characteristic storage process) + (predetermined time), the light source characteristic storage process is performed. The light source 11 may be turned off before t = 100 [hours]. In this case, when the light source 11 is turned on again and the accumulated lighting time becomes t ≧ 100 [hours], the light source characteristic storage process is performed. This corresponds to the point P2 in FIG. 3, and as shown in Table 1, corresponding to the content Ca (detected luminance = Ya [lumen]), cumulative lighting time = 100 [hour], target light source driving power = It is stored as 6830 [W].

  Next, when the cumulative lighting time is 160 hours, the content to be screened is changed from the content Ca to the content Cb, and the screen brightness of the projected image of the projector 10 is adjusted according to the user's operation with respect to the content Cb. . When the screen brightness is adjusted to an appropriate value (25000 lumens), the control unit 20 performs cumulative lighting in association with the detected brightness (= Yb) corresponding to the output brightness of the light source 11 at this time according to the user's operation. The time and the light source driving power are stored in the storage unit 19. This corresponds to the point P3 in FIG. 3, and as shown in Table 1, corresponding to the content Cb (target luminance = Yb [lumen]), cumulative lighting time = 160 [hour], target light source driving power = It is stored as 5703 [W].

  In addition, when the cumulative lighting time is 200 hours, it is assumed that the content to be screened is changed from the content Cb to the content Cc, and the screen brightness of the projected video of the projector 10 is adjusted according to the user's operation with respect to the content Cc. When the screen brightness is adjusted to an appropriate value (22000 lumens), the control unit 20 correlates with the detected brightness corresponding to the output brightness of the light source 11 at this time according to the user's operation, and the cumulative lighting time and the light source drive. The power is stored in the storage unit 19. This corresponds to the point P4 in FIG. 3, and as shown in Table 1, corresponding to the content Cc (target luminance = Yc [lumen]), cumulative lighting time = 200 [hour], target light source driving power = Stored as 5033 [W]. Further, when the content Cc is screened and the accumulated lighting time becomes t ≧ 300 = 200 + 100 [hours], the light source characteristic storage processing is performed. This corresponds to point P5 in FIG. 3, and as shown in Table 1, corresponding to the content Cc (target luminance = Yc [lumen]), cumulative lighting time = 300 [hour], target light source driving power = Stored as 5055 [W].

  Further, when the content to be screened is changed from the content Cc to the content Cb when the cumulative lighting time is 360 hours, for example, the previous light source driving power is set to 5703 [W] based on the cumulative lighting time. Thereafter, the output luminance of the light source 11 is adjusted according to the detection luminance detected by the luminance sensor 131, and when the difference between the target detection luminance Yb and the current detection luminance becomes smaller than a predetermined value, the light source characteristic storage processing is executed. Here, it is assumed that the adjustment process is executed promptly and the storage process is executed when the cumulative lighting time is 360 hours. This corresponds to point P6 in FIG. 3, and as shown in Table 1, corresponding to content Cb (detected luminance = Yb [lumen]), cumulative lighting time = 360 [hour], target light source driving power = Stored as 5763 [W].

  Further, for example, even when the difference between the target detection luminance Yb and the current detection luminance is smaller than a predetermined value when the previous light source driving power is set to 5703 [W], the elapsed time from the previous light source characteristic storage processing Based on the above, the light source characteristic storage processing may be executed. For example, as for the light source characteristic corresponding to the content Cb, information of t = 160 hours is the previous information. That is, the previous light source characteristic storage process is executed when the cumulative lighting time t = 160 hours. The current cumulative lighting time is t = 360 hours, and [current cumulative lighting time] ≧ [cumulative lighting time of previous information (160 hours)] + [predetermined time (100 hours)]. That is, a predetermined time (100 hours) has elapsed since the previous light source characteristic storage process. At this time, the current cumulative lighting time and light source driving power are stored in the storage unit 19 (light source characteristic storage processing is executed). Note that the luminance adjustment process may be executed before the light source characteristic storage process.

  Thereafter, the content Cb is screened, and when the accumulated lighting time becomes t ≧ 460 = 360 + 100 [hours], the light source characteristic storage process is performed. This corresponds to the point P7 in FIG. 3, and as shown in Table 1, corresponding to the content Cb (target luminance = Yb [lumen]), cumulative lighting time = 460 [hour], target light source driving power = It is stored as 5791 [W]. Similarly, when the accumulated lighting time becomes t ≧ 560 = 460 + 100 [hours], the light source characteristic storage process is performed. This corresponds to point P8 in FIG. 3, and as shown in Table 1, corresponding to content Cb (target luminance = Yb [lumen]), cumulative lighting time = 560 [hour], target light source driving power = It is stored as 5819 [W].

Thereafter, a condition such as when a predetermined operation performed by the user, for example, a signal indicating execution of the light source characteristic storage process after adjusting the output luminance of the light source 11 (such as a signal indicating that the output luminance of the light source has been changed) is detected. When the above condition is satisfied, the accumulated lighting time of the light source 11 and the light source driving power are associated with each other and stored in the storage unit 19 as light source characteristics. Further, even when a predetermined time has elapsed since the previous light source characteristic storage process has been performed, or when a brightness adjustment process has been performed, the accumulated lighting time of the light source 11 and the light source drive for each target brightness are also satisfied. The storage unit 19 stores the light source characteristics in association with the power. Also, when the target brightness (content or screen brightness) is changed, a signal indicating that the light source 11 is turned on is detected (after the light source 11 is turned on and stabilized), and the like, the conditions are satisfied The accumulated lighting time of the light source 11 and the light source driving power are associated with each other and stored in the storage unit 19 as light source characteristics. In addition, when a signal indicating that the light source 11 is turned off is detected (before the light source is turned off), when a new one is set, and the like, the cumulative lighting time of the light source 11 for each target luminance is also obtained. The light source driving power is associated and stored in the storage unit 19 as light source characteristics. It is not necessary to store at all the above timings.

  Further, for example, when 2000 hours, which is the life of the light source 11, elapses, the light source 11 is replaced with a new light source 11. The light source characteristic before the light source 11 is replaced corresponds to the point Pn. When the user replaces the light source 11, the cumulative lighting time is reset, and the cumulative lighting time corresponding to the light source 11 is set to 0 hour.

  According to the present embodiment, since the light source characteristics corresponding to a plurality of target luminances are stored, even if the cumulative lighting time of the light source becomes long, it can be quickly converged with respect to each target luminance.

  According to the present embodiment, the target luminance can be freely set within the operating power range of the light source, and the light source characteristic corresponding to the freely set target luminance is stored, so that the cumulative lighting time of the light source becomes long. However, it is possible to quickly converge with respect to the set target luminance.

  According to the present embodiment, the projector can display the content by adjusting the screen brightness to an optimum level according to the content.

According to the present embodiment, since the content name and various values (target luminance, cumulative lighting time, light source driving power) corresponding to the output luminance of the light source 11 are stored in association with each other, the user designates the content name. By doing so, the screen brightness can be easily set.
(Second Embodiment)
FIG. 4 is a block diagram showing a configuration of a projector 30 which is a projection display device according to the second embodiment of the present invention. Note that a description of portions common to the projector 10 according to the first embodiment is omitted. Hereinafter, differences from the projector 10 will be mainly described.

  The projector 30 includes a light source 11, a light source driving unit 12, an illumination optical unit 13, a signal input unit 14, a video processing unit 15, a display driving unit 16, a display unit 17, a projection optical unit 18, and a storage. The unit 19 and the control unit 40 are included.

  In the second embodiment, the light source driving power is controlled based on the light source characteristics created in the first embodiment.

  When the control unit 40 changes to the target luminance not having the light source characteristic, the accumulated lighting time of the light source 11 is stored from the light source characteristic corresponding to the target luminance larger and smaller than the target luminance after the change stored in the storage unit 19. The current light source driving power is calculated using the light source characteristics corresponding to the time before and after.

  Table 2 is a table showing light source characteristics similar to those in Table 1. However, Table 1 shows a case where various values are stored in relation to the screen brightness instead of the content name.

  For example, a case where the control unit 40 adjusts the screen brightness to 23000 lumen when the current cumulative lighting time is 250 hours will be described. The control unit 40 adjusts the screen brightness to 23000 lumens according to the user's operation to change the screen brightness. For example, as shown in Table 2, it is assumed that the light source characteristics when the screen brightness = 25,000 lumens and 22,000 lumens are stored. Cumulative lighting time when screen luminance = 25000 lumens = 160 hours, light source driving power (sample driving power) = 5703 [W], cumulative lighting time = 360 hours, light source driving power (sample driving power) = 5763 [W] For example, linear interpolation is performed. Thereby, the light source driving power = 5730 [W] for the cumulative lighting time 250 hours when the screen luminance = 25000 lumens is calculated. Further, as shown in Table 2, when the screen brightness = 22,000 lumens, the cumulative lighting time = 200 hours, the light source driving power (sample driving power) = 5033 [W], the cumulative lighting time = 300 hours, and the light source driving power ( For example, linear interpolation is performed using (sample driving power) = 5055 [W]. Thereby, the light source driving power = 5044 [W] for the cumulative lighting time 250 hours when the screen luminance = 22000 lumens is calculated. Using the screen luminance and the calculated light source driving power, for example, by linear interpolation or the like, the light source driving power (target driving power) = 5273 [W] when the screen luminance = 23000 lumens and the cumulative lighting time 250 hours is calculated, The light source driving power is set to 5273 [W].

  In the present embodiment, the calculation is performed using the cumulative lighting times before and after the current cumulative lighting time, but the previous two cumulative lighting times may be used as in the first embodiment. In the present embodiment, the changed target luminance is the target luminance between the target luminances stored in the light source characteristics, but may be a value larger or smaller than the stored target luminance. In this case, the sample driving power corresponding to at least two stored target luminances and the current cumulative lighting time can be obtained, for example, as a value on a straight line connecting the two sample driving powers.

  That is, when changing to the target luminance not included in the light source characteristics stored in the storage unit, the control unit 40 uses the light source characteristics to at least the two cumulative lighting times immediately before the current cumulative lighting time or Sample drive power corresponding to the cumulative lighting time immediately before and after is obtained for each of at least two types of target luminances. The target drive power corresponding to the current cumulative lighting time is obtained using the obtained sample drive power, and the light source drive unit 12 is caused to light the light source 11 using the obtained target drive power.

In the present embodiment, in addition to the effects of the first embodiment, the control unit is appropriate based on the light source characteristics corresponding to the plurality of screen luminances stored in the storage unit 19 according to the screen luminance newly set by the user. Since the light source driving power is set, a new screen brightness can be easily set.
(Third embodiment)
FIG. 5 is a block diagram showing a configuration of a projector 50 which is a projection display device according to the third embodiment of the present invention. Note that a description of portions common to the projector 10 according to the first embodiment is omitted. Hereinafter, differences from the projector 10 will be mainly described. The third embodiment can also be applied to the second embodiment.

  The projector 50 includes a light source 11, a light source driving unit 12, an illumination optical unit 13, a signal input unit 14, a video processing unit 15, a display driving unit 16, a display unit 17, a projection optical unit 18, and a storage. Unit 19, exchange detection unit 21, and control unit 60. The exchange detection unit 21 detects that the light source 11 has been exchanged. The control unit 60 performs processing based on the result detected by the replacement detection unit 21 in addition to the operation of the control unit 20 or 40.

  In the third embodiment, when it is detected that the light source 11 has been replaced, the cumulative lighting time of the light source 11 is reset, adjusted using the light source 11 before replacement, and based on the light source characteristics stored in the storage unit 19. To adjust the brightness. The replacement of the light source 11 is detected, for example, by detecting that a door or cover near the light source 11 that is opened and closed when the light source 11 is replaced, and determining that the light source 11 has been replaced if there is an open / close. Also good. Further, the light source 11 is exchanged when the light source driving power when the light source 11 is turned on is compared between the previous state where the power source of the projector 50 is activated and the current state is larger than a predetermined power difference. It may be determined that In addition, a general technique can be used to detect replacement of the light source 11.

  For example, when the light source 11 is replaced with a new light source, the accumulated lighting time of the light source 11 may not be reset and the accumulated lighting time stored before the replacement may be used. In this case, since the light source characteristic after using the light source 11 for a long time is used, the difference between the set light source driving power and the appropriate light source driving power becomes large, and adjustment is performed for a new light source 11. There is a problem that it takes time.

  In the third embodiment, in addition to the effects of the first or second embodiment, the replacement of the light source 11 is detected and the cumulative lighting time of the light source 11 is reset, so that the above problem can be prevented.

  Further, the light source characteristics stored in the storage unit 19 may be stored by adding the light source characteristics of the light source 11 after replacement while maintaining the light source characteristics of the light source 11 before replacement. In this case, there is a possibility that a plurality of pieces of information on the same cumulative lighting time may exist. For example, a general information processing technique such as using an average value or making a determination based on the relationship with the previous and subsequent cumulative lighting times. Can be used to determine the appropriate light source driving power.

The light source characteristics stored in the storage unit 19 may be deleted according to the accumulated lighting time of the light source 11 after replacement. For example, if the light source characteristic storage process is executed when the cumulative lighting time of the light source 11 is 500 hours, the information of the light source 11 before replacement before the cumulative lighting time of 500 hours is deleted. In this case, since the amount of information to be used is small compared to the configuration in which the information is added, the light source driving power can be easily obtained.
(Modification)
In the first embodiment, the content name and various values corresponding to the output luminance of the light source 11 are stored in association with each other. In the second embodiment, the screen luminance and the various values corresponding to the output luminance of the light source 11 are stored. However, the screen brightness in the first embodiment, the content name in the second embodiment, and various values corresponding to the output brightness of the light source 11 may be stored in association with each other.

  In the first embodiment, when the screen brightness is different, in other words, the case where the detected brightness Ya, Yb, and Yc is different from each other is shown. . When any one of the detected luminances Ya, Yb, and Yc has the same value, the content having the same value may be stored as one light source characteristic.

  In the present embodiment, the light source characteristic storage process is executed when a predetermined time elapses after the previous light source characteristic storage process. However, the predetermined time may be, for example, 1 hour or 10 hours.

  In the present embodiment, the light source characteristics are stored for each luminance of the light source, but may be stored for each luminance of the light source and / or for each type of the light source. In this case, the control unit sets the light source driving power according to the luminance of the light source and / or the type of the light source. The video display device may include a light source detection unit that detects the type of the light source, and the control unit may operate according to the output of the light source detection unit.

  In this embodiment, the light source driving power is used as a parameter for adjusting the luminance of the light source. However, instead of the light source driving power, a light source driving current, a light source driving voltage, or a light source driving power may be used in combination. good.

  In the present embodiment, the light source characteristics are stored as a look-up table. However, the present invention is not limited to this, and an approximation curve as shown in FIG. 6 or a line graph in which each measurement point is connected by a straight line is used. You may remember. The approximate curve P30 in FIG. 6 corresponds to the content Ca, the approximate curve P25 corresponds to the content Cb, and the approximate curve P22 corresponds to the content Cc.

  Further, in the present embodiment, when the content is shown, the user sets the name of the content to be shown in the projector 10, but the screen brightness corresponding to the content to be shown may be set instead of the content name. In accordance with the set content name or screen brightness, the projector 10 sets various values corresponding to the target brightness stored in the storage unit 19 in the projector 10 to display the content. The content name or screen brightness set by the user may be set before the light source 11 is turned on, or may be set after the light source 11 is turned on.

  In this embodiment, the lamp is used as the light source of the projector. However, the present invention is not limited to this. For example, a solid light source such as an LED may be used as the light source.

  In this embodiment, a straight line is obtained using information corresponding to two (two points) accumulated lighting times indicated by the light source characteristics as the set value of the light source driving power, and the obtained straightness value is used. However, other processes may be used. For example, you may perform the process which calculates | requires an approximated curve using the information corresponding to the cumulative lighting time of several points (three points) or more.

  Moreover, the memory | storage part 19 may memorize | store the light source representative characteristic which is the typical characteristic of the light source 11 to be used previously. The control unit 20 predicts a change in the light source driving power based on the light source representative characteristics using the accumulated lighting time and the current accumulated lighting time when stored last time, and previously stored the light source characteristics with respect to a predetermined target luminance. The current light source driving power may be obtained based on the change in the light source driving power and the predicted light source driving power.

DESCRIPTION OF SYMBOLS 10, 30, 50 Projector 11 Light source 12 Light source drive part 13 Illumination optical part 14 Signal input part 15 Image processing part 16 Display drive part 17 Display part 18 Projection optical part 19 Storage part 20, 40, 60 Control part 21 Exchange | exchange detection part

Claims (10)

A light source;
A light source driving unit for supplying light source driving power to the light source;
A luminance detection unit for detecting a detection luminance corresponding to the light output from the light source;
A storage unit that stores a light source characteristic indicating a relationship between a cumulative lighting time obtained by accumulating a time during which the light source is turned on and the light source driving power for each target luminance that is a target when the light source is turned on,
When the light source is turned on, a control unit that controls the light source driving unit so that a difference between the detected luminance and the target luminance is smaller than a predetermined value;
A projection display device comprising:   The control unit, when detecting an instruction to turn on the light source, turns on the light source based on the target luminance when the light source is turned on, a cumulative lighting time of the light source, and the light source characteristics. The projection display device described in 1.   When the light source is turned on, the control unit uses the light source characteristic corresponding to the target luminance when the light source is turned on, and at least two previous cumulative lighting times or immediately before the current cumulative lighting time. A sample driving power corresponding to the immediately subsequent cumulative lighting time is obtained, a target driving power corresponding to the current cumulative lighting time is obtained using the obtained sample driving power, and the light source driving unit is obtained using the obtained target driving power. The projection display device according to claim 2, wherein the light source is turned on. The light source characteristics stored in the storage unit include light source characteristics for at least two or more target luminances,
When the control unit changes to the target luminance not included in the light source characteristics, the light source characteristics are used, and at least two cumulative lighting times immediately before the current cumulative lighting time or cumulative lighting times immediately before and immediately after the current cumulative lighting time. Is obtained for each of at least two types of target luminances, the target driving power corresponding to the current cumulative lighting time is obtained using the obtained sample driving power, and the obtained target driving power is used to determine the target driving power. The projection display device according to claim 3, wherein the light source is turned on by a light source driving unit.   5. The control unit according to claim 1, wherein, when a predetermined condition is satisfied, the accumulated lighting time of the light source and the light source driving power are associated with each target luminance and stored in the storage unit as the light source characteristic. A projection display device according to claim 1. The predetermined condition is:
When it detects a signal indicating that the output brightness of the light source has changed,
When a predetermined time has elapsed since the previous light source storage process of storing the cumulative lighting time and the light source driving power in the storage unit,
When performing a brightness adjustment process for adjusting the difference between the detected brightness and the target brightness to be smaller than a predetermined value,
When a signal indicating turning on the light source is detected,
Detecting a signal indicating turning off the light source; and
When the target brightness is changed,
When the new target brightness is set,
The projection display device according to claim 5, wherein at least one of the projection display devices is included.   The projection display device according to claim 1, wherein the light source characteristic is stored for each type of light source. The video display device further includes a replacement detection unit that detects that the light source has been replaced,
The projection display device according to claim 1, wherein when the control unit detects that the light source has been replaced, the cumulative lighting time of the light source is set to 0 hour.   The projection type according to any one of claims 1 to 8, wherein the light source characteristics stored in the storage unit are additionally stored with the light source characteristics of the light source after replacement while maintaining the light source characteristics of the light source before replacement. Display device. A light source control method for a projection display device,
Supply light source drive power to the light source,
Detecting a detection luminance corresponding to the light output from the light source;
For each target luminance that is a target when the light source is turned on, a light source characteristic indicating a relationship between the cumulative lighting time obtained by accumulating the time during which the light source is turned on and the light source driving power is stored,
A light source control method for controlling the light source driving unit so that a difference between the detected luminance and the target luminance is smaller than a predetermined value when the light source is turned on.

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