JP2013109183A - Projection-type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a projection device that automatically performs correction to deal with reduction in luminance or contrast caused by luminance reduction with time of using a light source lamp in a case where the same screen size is employed for display, in order to overcome the problem that luminance adjustment of the light source lamp and the adjustment function of gain are not sufficient when the brightness of the projection device is to be adjusted at a time or a place under such a projection environment that the amount of outside light is large.SOLUTION: The objective of the present invention is to provide a projection-type display device that improves the level of visibility by automatically adjusting optical zoom when reduction in the luminance of the light source lamp causes reduction in luminance of a projected image.

Description

  The present invention relates to a projection display device having an optical zoom function and a light source lamp. When the brightness of the lamp or the illuminance on the screen changes due to external light changes, the optical zoom function automatically improves visibility. is there.

  Conventional projectors have a problem that the illuminance and contrast on the screen decrease when the projector is used with a fixed projection size (fixed optical zoom) due to changes in brightness and changes in ambient light over time. .

  For example, when the lamp brightness is extremely reduced in a ceiling-mounted installation, the lamp replacement warning screen and menu screen are not visible, so there is a problem that the lamp replacement is not noticed and various adjustments cannot be made using the remote control. It was.

  Patent Document 1 discloses an example in which lamp brightness is adjusted so that visibility is not impaired by excessively increasing screen illuminance when the screen size is reduced by a zoom lens. However, there is no description about improving the visibility without adjusting the lamp brightness.

  Patent Document 2 discloses an example in which gain, offset (contrast and brightness), lamp brightness, and the like are adjusted so that screen brightness remains constant even when the zoom ratio is changed. However, it does not describe improving visibility without adjusting brightness, lamp brightness, and the like.

JP 2003-131323 A Japanese Patent Laid-Open No. 11-69264

  However, the conventional techniques disclosed in the above-mentioned patent documents have a problem that visibility cannot be improved when gain, offset, lamp brightness, and the like cannot be adjusted.

  In addition, depending on the location and time zone where there is a lot of external light, it may be insufficiently adjusted only by adjusting the gain, offset, and lamp brightness.

  Therefore, an object of the present invention is to provide a projection display device that improves visibility by correcting screen illuminance and contrast without adjusting gain, offset, and lamp brightness when the light source lamp brightness decreases. It is to be.

  In order to achieve the above object, the present invention detects lamp brightness, lamp time, external light, screen projection brightness, etc., and corrects the optical zoom based on these information to optimize the screen illuminance and contrast for visual recognition. It is characterized by improving the performance.

In order to solve the above problems in the projection image display device of the present invention,
According to the invention of claim 1,
A lamp serving as a light source, an optical device having a light modulation device and the like, and a projection lens having an optical zoom function,
Means for detecting the lamp brightness value;
Means for previously storing a plurality of zoom correction values corresponding to the lamp brightness values;
A first step of detecting a change in the lamp brightness value;
There is provided a brightness correction method for a projection display device, comprising a second step of automatically adjusting an optical zoom based on the detection result.
According to invention of Claim 2,
A lamp serving as a light source, an optical device having a light modulation device and the like, and a projection lens having an optical zoom function,
Means for measuring the lamp lighting time;
Means for previously storing a plurality of zoom correction values corresponding to the lamp lighting time;
A first step of detecting a change in the lamp lighting time;
There is provided a brightness correction method for a projection display device, comprising a second step of automatically adjusting an optical zoom based on the detection result.
According to invention of Claim 3,
A lamp serving as a light source, an optical device having a light modulation device and the like, and a projection lens having an optical zoom function,
Means for detecting the external light;
Means for storing a plurality of zoom correction values corresponding to an ambient light value around the projection screen, and a first step of detecting a change in the ambient light value;
There is provided a brightness correction method for a projection display device, comprising a second step of automatically adjusting an optical zoom based on the detection result.
According to invention of Claim 4,
A lamp serving as a light source, an optical device having a light modulation device and the like, and a projection lens having an optical zoom function,
Means for detecting the brightness of the projected image on the screen;
Means for storing a plurality of zoom correction values corresponding to the luminance values on the screen;
A first step of detecting a change in luminance value on the screen;
There is provided a brightness correction method for a projection display device, comprising a second step of automatically adjusting an optical zoom based on the detection result.
According to the invention of claim 5,
A lamp serving as a light source, an optical device having a light modulation device and the like, and a projection lens having an optical zoom function,
Means for detecting the lamp brightness value;
Means for measuring the lamp lighting time;
Means for detecting external light around the projection screen;
Means for detecting the brightness of the projected image on the screen;
The lamp brightness value, lamp lighting time, ambient light around the projection screen, and brightness on the screen of the projected image;
Means for storing a plurality of zoom correction values corresponding to these combinations;
The lamp brightness value, lamp lighting time, ambient light around the projection screen, and brightness on the screen of the projected image;
A first step of detecting any or all of these changes;
There is provided a brightness correction method for a projection display device, comprising a second step of automatically adjusting an optical zoom based on the detection result.
According to the invention of claim 6,
The optical zoom automatic adjustment according to any one of claims 1 to 5,
There is provided a luminance correction method for a projection display device, wherein the correction is made in the tele direction when correcting brightly, and the wide side is corrected when correcting darkly.
According to the invention of claim 7,
The optical zoom automatic adjustment according to any one of claims 1 to 5,
There is provided a luminance correction method for a projection display apparatus, wherein correction is performed in the tele direction when the correction is performed to increase the contrast, and correction is performed on the wide side when the correction is performed to decrease the contrast.
According to the invention described in claim 8,
The optical zoom automatic adjustment according to any one of claims 1 to 5,
There is provided a luminance correction method for a projection display device, wherein a variable range from a tele end to a wide end is changed.

  According to the present invention, there is provided a projection display device that can optimally correct the illuminance and contrast on the screen by adjusting the optical zoom even when the lamp brightness fluctuates in the installation state such as a ceiling or the outside light changes. .

  Furthermore, even when the gain, offset (brightness), lamp brightness adjustment range, etc. are limited, the lamp brightness, lamp lighting time, ambient light around the projection screen, brightness on the screen of the projected image, etc. are detected in advance. The illuminance and contrast on the screen can be optimally corrected by applying the corresponding zoom correction value stored.

1 is a block diagram showing a configuration of a projector that is Embodiment 1 of the present invention. Flowchart for automatically controlling optical zoom in the first embodiment FIG. 3 is a block diagram illustrating a configuration of a projector that is Embodiment 2 of the present invention. Flowchart for automatically controlling optical zoom in the second embodiment FIG. 6 is a block diagram illustrating a configuration of a projector that is Embodiment 3 of the present invention. Flowchart for automatically controlling optical zoom in the third embodiment FIG. 9 is a block diagram showing a configuration of a projector that is Embodiment 4 of the present invention. Flowchart for automatically controlling optical zoom in the fourth embodiment Block diagram showing the configuration of a projector that is Embodiment 5 of the present invention Flowchart for automatically controlling optical zoom in the fifth embodiment Graph showing the relationship between optical zoom and screen illumination Optical zoom range

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

[Example 1]
FIG. 1 shows the configuration of a liquid crystal projector as an image display apparatus that is Embodiment 1 of the present invention. It is a figure showing main components in an embodiment of an image display device.

  First, each function, image, and control flow will be described.

  The image processing 14 receives a video input 13 from an image supply device such as a personal computer (PC) (not shown) as an input signal.

  The image signal processing 14 performs various signal processing such as scaling and color signal processing necessary for the projector, passes through the OSD 15 that displays the menu screen, etc., and then sends the image sent from the liquid crystal panel drive 16 to the liquid crystal panel 10 for projection. Form on panel 10.

The liquid crystal panel drive 16 generates a drive timing signal necessary for driving the liquid crystal panel 10,
A drive signal for the liquid crystal panel 10 is generated by performing gamma correction or the like.

  The liquid crystal panel 10 modulated by the video signal of the video input 13 receives the light of the light source lamp 9 consisting of a high-pressure mercury lamp, and optically zooms the light beam based on the control by the liquid crystal display element drive signal from the liquid crystal panel drive 16 This is sent to the projection lenses 11 and 12 having the function.

  The light from the light source lamp 9 passes through an optical filter for color separation (not shown), is optically modulated by the liquid crystal panel 10, and is sent to the projection lenses 11 and 12 through an optical filter for color synthesis (not shown).

  The projection lenses 11 and 12 project and display an image on the screen 17 with projection light corresponding to the zoom ratio and focus. The projection lens 11 is a lens that moves in accordance with the zoom ratio, and the projection lens 12 indicates a lens whose position is fixed.

  The position of the projection lens 11 is detected by the photo interrupter 7, and the zoom position information is transmitted from the zoom position detector 4 to the zoom control means 18 of the control means 3 comprising a microcomputer.

  The zoom control means 18 drives the zoom motor 6 from the zoom drive unit 5 to perform optical zoom control.

  In the zoom control, zoom driving is performed by a control program in the program memory 2 by a signal from the operation unit 1 by a remote controller or the like, and the zoom position desired by the user is set.

  The brightness sensor 8 detects the brightness of the light source lamp 9, and the lamp brightness information is transmitted to the lamp brightness detection means of the control means 3.

  With such a configuration, it is possible to constantly monitor the lamp brightness and to control the optical zoom ratio of the projection lens to an optimum state based on the result.

  FIG. 2 shows an operation flowchart of the configuration of FIG. 1 which is Embodiment 1 of the present invention.

  First, when the projector is energized, a zoom correction value table for the lamp luminance value is read in step S201.

  For example, this table is shown in FIG. 13 for correcting the zoom to the TELE side when the lamp brightness decreases.

  After the lamp is lit in step S202, the user adjusts zoom and focus in step S203.

  In step S204, the lamp brightness is detected, and in step S205, it is determined whether or not a zoom change is necessary. If not necessary, the process moves to step S208. If correction is necessary, the zoom is corrected in step S206.

  In step S207, the focus is automatically adjusted corresponding to the case where the focus is shifted.

  In step S208, it is determined whether or not the lamp is extinguished, and if not, the process returns to step S204.

  With this operation, even if the lamp brightness decreases so that characters and images on the screen cannot be identified, the display screen size can be reduced by automatically optically correcting to the TELE side. The contrast can be improved by increasing the illuminance on the screen to correct it.

As shown in FIG. 11, a projector having a normal optical zoom function has a characteristic that, when the distance from the screen is fixed, the illuminance on the scoon decreases on the wide side and reverses on the tele side.

  That is, when the brightness and contrast of the projector are lowered, in order to obtain the same brightness and contrast as before the change, it is improved by changing to the tele side.

  Thus, how to correct the image will be described with reference to FIG.

  When the lamp brightness is bright, the variable range of the optical zoom is 1, and there is a variable range up to the end on the tele side wide side, and it is assumed that the zoom is set to the A1 point.

  Next, when the lamp brightness decreases slightly and becomes dark, the variable range of the optical zoom is changed to 2. Since the A1 point is zoomed to the A2 point, the brightness and contrast on the screen are improved.

  Next, when the lamp brightness further decreases and becomes dark, the variable range of the optical zoom is changed to 3. Since the A2 point is zoomed to the A3 point, the brightness and contrast on the screen are improved.

  Thus, by using the lamp brightness and zoom correction table, the zoom position is corrected as the lamp brightness decreases, and the brightness and contrast on the screen are automatically improved.

[Example 2]
FIG. 3 shows a configuration of a liquid crystal projector as an image display apparatus that is Embodiment 2 of the present invention. It is a figure showing main components in an embodiment of an image display device.

  Differences from the configuration of the first embodiment will be mainly described.

  Although the lamp brightness is detected in the first embodiment, the lamp lighting time is detected instead in the second embodiment, and the optical zoom ratio is controlled to an optimum state.

  This is because a general light source lamp has a lamp brightness that decreases with the passage of lighting time, and a decrease in screen illuminance can be corrected by performing zoom correction from the lamp time.

  The same parts as Example 1 are omitted.

  When the control means 3 receives the ON signal from the operation means 1, the control means 3 turns on the light source lamp 9. The lamp lighting time is integrated by the lamp time detection means by the internal counter of the control means 3 by the program, and the result is notified to the zoom control means 18.

  The zoom control means 18 controls the optical zoom to an optimum state from the zoom correction value with respect to the lamp time.

  With such a configuration, it is possible to monitor the lamp lighting time corresponding to the lamp brightness and to control the optical zoom ratio of the projection lens to an optimum state based on the result.

  FIG. 4 shows an operation flowchart of the configuration of FIG. 3 which is Embodiment 2 of the present invention.

  The operation is basically the same as that of the first embodiment, and the same operation is performed during the lamp lighting time instead of the detection of the lamp luminance.

  In step S404, it is determined from the lamp lighting time whether zoom change is necessary in step S405. If unnecessary, the process moves to step S408, and if correction is necessary, the zoom is corrected in step S406.

  By performing this operation, even if the lamp brightness decreases as the lamp lighting time elapses, it automatically and optically corrects to the TELE side, thereby reducing the size of the display screen and increasing the illuminance on the screen. To improve the contrast.

[Example 3]
FIG. 5 shows a configuration of a liquid crystal projector as an image display apparatus that is Embodiment 3 of the present invention. It is a figure showing main components in an embodiment of an image display device.

  Differences from the configuration of the first embodiment will be mainly described.

  In the first embodiment, the brightness of the lamp is detected. However, in the third embodiment, so-called external light that is illuminated by an external illumination or the like is detected instead, and the optical zoom ratio is controlled to an optimum state. .

  This is because even when the brightness of the lamp light source and the optical zoom are the same, when the ambient light changes from a weak state to a strong environment, the contrast on the screen decreases and the visibility deteriorates. In particular, this tendency has a great influence on the gradation expression in the dark part, which causes problems such as blackout.

  In such a situation, it is necessary to further increase the brightness of the projected image, and the reduction in screen illuminance of the projected image can be corrected by correcting to the TELE side by zoom correction.

  The same parts as Example 1 are omitted.

  The illumination 22 is assumed to be illumination arranged on the ceiling of a conference room or sunlight incident from a window.

  In order to detect such external light, the intensity is detected by the luminance sensor 8 and notified to the external light detection means 21 of the control means 3.

  The zoom control means 18 of the control means 3 controls the optical zoom to an optimum state from the zoom correction value for the intensity of outside light.

  With such a configuration, it is possible to monitor the intensity of external light and control the optical zoom ratio of the projection lens based on the result, thereby optimizing the contrast of the projected image on the screen.

  FIG. 6 shows an operation flowchart of the configuration of FIG. 5 which is Embodiment 3 of the present invention.

  The operation is basically the same as that of the first embodiment, and the same operation is performed by detecting external light such as illumination instead of the detection of the lamp luminance.

  In step S604, it is determined whether or not the zoom change is necessary in step S605 from the detection of the external light luminance. If unnecessary, the process moves to step S608. If correction is necessary, the zoom is corrected in step S606.

  By performing this operation, even when the external light intensity increases, optically automatically corrects to the TELE side to reduce the size of the display screen and increase the illuminance on the screen of the projected image. The contrast can be improved by correcting.

[Example 4]
FIG. 7 shows a configuration of a liquid crystal projector as an image display apparatus that is Embodiment 4 of the present invention. It is a figure showing main components in an embodiment of an image display device.

  Differences from the configuration of the first embodiment will be mainly described.

  In the first embodiment, the brightness of the lamp is detected, but in the fourth embodiment, the brightness on the screen of the projected image is detected instead, and the illuminance of the projected image is controlled to an optimum state by the optical zoom ratio. Yes.

  The reason for this is that the brightness reduction factor of the projector is not only due to the passage of the lighting time of the light source lamp but also due to, for example, an optical filter that performs color separation and synthesis. This is because it is possible to correct the decrease in the image quality.

  The same parts as Example 1 are omitted.

  The brightness sensor 22 detects the brightness of the projected image on the screen, and the screen brightness information is transmitted to the screen brightness detection means of the control means 3.

  With such a configuration, it is possible to constantly monitor the screen brightness and to control the optical zoom ratio of the projection lens to an optimum state based on the result.

  FIG. 8 shows an operation flowchart of the configuration of FIG. 7 which is Embodiment 4 of the present invention.

  The operation is basically the same as that of the first embodiment, and the same operation is performed with the screen luminance instead of the detection of the lamp luminance.

  In step S804, for example, a 100% white image is projected to detect the screen brightness, and in step S805, it is determined whether or not a zoom change is necessary. If unnecessary, the process moves to step S808. If correction is necessary, the zoom is corrected in step S806.

  By performing this operation, even when the brightness is reduced by a lamp or optical filter, the display screen size is reduced and the illuminance on the screen is increased by automatically and optically correcting to the TELE side. Can improve contrast.

[Example 5]
FIG. 9 shows a configuration of a liquid crystal projector as an image display apparatus that is Embodiment 5 of the present invention. It is a figure showing main components in an embodiment of an image display device.

  Differences from the configuration of the first embodiment will be mainly described.

  The luminance sensor 8 is composed of three types, detects the brightness of each, and is transmitted as information to various detection means 24 of the control means 3.

  The first detects the light source lamp 9, the second detects the external light illumination 22, and the third detects the brightness of the screen.

  The various detection means of the control means 3 monitor the brightness and contrast on the screen from the three types of brightness information and lamp lighting time, and control the optical zoom ratio of the projection lens to the optimum state based on the results. It becomes possible.

  FIG. 10 shows an operation flowchart of the configuration of FIG. 7 which is Embodiment 5 of the present invention.

  The operation is basically the same as that of the first embodiment, and the same operation is performed with the outside light, the screen luminance, and the lamp time in addition to the detection of the lamp luminance.

  In step S1004, various pieces of luminance information are detected, and in step S1005, it is determined whether or not zoom change is necessary. If unnecessary, the process moves to step S1008. If correction is necessary, the zoom is corrected in step S1006.

  With this operation, even if the brightness decreases due to multiple factors such as lamps, external light, and optical filters, the display screen size can be reduced by automatically and optically correcting to the TELE side. The brightness and contrast can be improved by increasing the illuminance on the screen.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

DESCRIPTION OF SYMBOLS 1 Operation part 2 Program memory 3 Control means 4 Zoom position detection means 5 Zoom drive part 6 Zoom motor 7 Zoom position detector 8 Luminance sensor 9 Light source lamp 10 Liquid crystal panel 11 Projection zoom lens 1
12 Projection zoom lens 2
13 Video input 14 Image processing 15 OSD (On-screen display)
16 Liquid crystal panel drive 17 Screen 18 Zoom control means 19 Lamp brightness detection means 20 Lamp time detection means 21 External light detection means 22 Illumination 23 Screen brightness detection means 24 Various detection means

Claims (8)

A lamp serving as a light source, an optical device having a light modulation device, and a projection lens having an optical zoom function,
Means for detecting the lamp brightness value;
Means for previously storing a plurality of zoom correction values corresponding to the lamp brightness values;
A first step of detecting a change in the lamp brightness value;
A projection display device comprising a second step of automatically adjusting an optical zoom based on the detection result. A lamp serving as a light source, an optical device having a light modulation device, and a projection lens having an optical zoom function,
Means for measuring the lamp lighting time;
Means for previously storing a plurality of zoom correction values corresponding to the lamp lighting time;
A first step of detecting a change in the lamp lighting time;
A projection display device comprising a second step of automatically adjusting an optical zoom based on the detection result. A lamp serving as a light source, an optical device having a light modulation device, and a projection lens having an optical zoom function,
Means for detecting the external light;
Means for storing a plurality of zoom correction values corresponding to an ambient light value around the projection screen, and a first step of detecting a change in the ambient light value;
A projection display device comprising a second step of automatically adjusting an optical zoom based on the detection result. A lamp serving as a light source, an optical device having a light modulation device, and a projection lens having an optical zoom function,
Means for detecting the brightness of the projected image on the screen;
Means for storing a plurality of zoom correction values corresponding to the luminance values on the screen;
A first step of detecting a change in luminance value on the screen;
A projection display device comprising a second step of automatically adjusting an optical zoom based on the detection result. A lamp serving as a light source, an optical device having a light modulation device, and a projection lens having an optical zoom function,
Means for detecting the lamp brightness value;
Means for measuring the lamp lighting time;
Means for detecting external light around the projection screen;
Means for detecting the brightness of the projected image on the screen;
The lamp brightness value, lamp lighting time, ambient light around the projection screen, and brightness on the screen of the projected image;
Means for storing a plurality of zoom correction values corresponding to these combinations;
The lamp brightness value, lamp lighting time, ambient light around the projection screen, and brightness on the screen of the projected image;
A first step of detecting any or all of these changes;
A projection display device comprising a second step of automatically adjusting an optical zoom based on the detection result. Automatic optical zoom adjustment
6. The projection type display device according to claim 1, wherein when correcting brightly, the telephoto direction is corrected, and when correcting darkly, the wide side is corrected. Automatic optical zoom adjustment
6. The projection display device according to claim 1, wherein when the correction is made to increase the contrast, the telephoto direction is corrected, and when the correction is made to decrease the contrast, the correction is made to the wide side. Automatic optical zoom adjustment
6. The projection display device according to claim 1, wherein a variable range from the tele end to the wide end is changed.