JP2013142738A - Display device, control method thereof, and electronic apparatus - Google Patents

Abstract

Light control is possible with a simple configuration.
A control unit of a projection display device that outputs a control signal CTL for setting a right-eye shutter and a left-eye shutter to an open state or a closed state generates a histogram for specifying a distribution of brightness of an image signal. A unit 53, a dimming coefficient determination unit 54 that determines a dimming coefficient K1 from the histogram, an image processing coefficient determination unit 55 that determines an image processing coefficient K2 of an image to be displayed based on the dimming coefficient K1, An image processing unit 52 that performs image processing on the image signal Vd and outputs the image processing signal Va, means for displaying an image based on the image processing signal Va, and a control signal CTL based on the dimming coefficient K1 And a control signal generation unit 56.
[Selection] Figure 2

Description

  The present invention relates to a light control technique for a display device.

As a projection display device, a light source, a transmissive liquid crystal panel, a mechanical diaphragm provided between the light source and the liquid crystal panel, an optical system that projects light transmitted through the liquid crystal panel onto a screen, and a liquid crystal panel And a means for supplying a drive voltage corresponding to an image signal to the image signal is known (for example, Patent Document 1). The projection display device calculates a dimming coefficient according to the image signal, changes the aperture according to the dimming coefficient, adjusts the amount of light incident on the liquid crystal panel, and adjusts the amount of the image signal according to the dimming coefficient. The level is controlled and supplied to the liquid crystal panel.
There is also known a projection display device that changes the luminance of a light source without using a mechanical diaphragm, controls the level of an image signal in accordance with this, and supplies it to a liquid crystal panel (for example, Patent Documents). 2).

JP 2004-361703 A JP-A-5-66501

However, since the technique described in Patent Document 1 uses a mechanical diaphragm, there is a problem that the apparatus becomes large and a stepping motor is necessary to adjust the diaphragm.
The technique described in Patent Document 2 uses a type of light source (for example, a halogen lamp) whose luminance is continuously changed. However, with this type of light source, a sufficient amount of light cannot be obtained and a bright image is obtained. There was a problem that could not be projected.
The present invention has been made in view of the above-described problems, and it is an object of the present invention to adjust light with a simple configuration while ensuring a light amount.

In order to solve the above-described problem, a display device according to the present invention includes:
A control signal for setting the right-eye shutter and the left-eye shutter to an open state or a closed state is output to the glasses having the right-eye shutter and the left-eye shutter, and the right-eye image and the left-eye shutter A display device capable of displaying images in a time-sharing manner,
A dimming coefficient determining means for determining a dimming coefficient based on brightness information of the image signal;
Control signal generating means for generating the control signal based on the dimming coefficient.

According to the present invention, the display device analyzes the image signal to determine the dimming coefficient, and controls opening and closing of the right eye shutter and the left eye shutter of the glasses according to the dimming coefficient. That is, it is possible to control the opening and closing of the shutter included in the glasses according to the brightness of the image displayed on the display device. This eliminates the need to provide dimming means in the display device, thereby simplifying the configuration of the display device and reducing the size.
Moreover, since the display device according to the present invention controls glasses including a right-eye shutter and a left-eye shutter that operate in a binary manner such as an open state and a closed state, a control signal generation that generates a control signal A means can be made into a simple structure. In addition, the display device according to the present invention is applicable to any glasses that can control opening / closing of the shutter.
Note that the “brightness information of the image signal” includes the average value and the maximum value of the gradation of one screen in addition to the distribution of the brightness of the image signal (for example, a histogram).

  In the display device described above, each of the right-eye display period, which is a period for displaying the right-eye image, and the left-eye display period, for which the left-eye image is displayed, includes a shielding period and an open period. When the 3D display is performed, the control signal generation unit sets the right-eye shutter and the left-eye shutter in a closed state in the shielding period of the right-eye display period, and the right-eye display period In the open period, the left-eye shutter is set in a closed state, and in the open period, the right-eye shutter is set in an open state in a period of time corresponding to the dimming coefficient. In the occlusion period of the eye display period, the right eye shutter and the left eye shutter are set in a closed state, and in the open period of the left eye display period, the right eye shutter is closed. While being set, it is preferable to generate the control signal so that the left-eye shutter at the time length periods in accordance with the dimming factor among the opening period is set to an open state.

According to the present invention, it is possible to control the right-eye shutter and the left-eye shutter, which originally operate in a binary manner such as the open state and the closed state, to be in the open state for a period of time corresponding to the dimming coefficient. Therefore, the right-eye shutter and the left-eye shutter can function as a stereoscopic shutter and can function as a dimming unit.
Thereby, the structure of a display apparatus can be simplified. In addition, the display device according to the present invention can be applied to any type of glasses that can control opening and closing of the shutter, and is highly versatile.

  In the above-described display device, when the control signal generation unit performs flat display, a period in which the right-eye shutter is set to an open state and a period in which the left-eye shutter is set to an open state are It is preferable to generate the control signal so as to have a time length according to the dimming coefficient. According to the present invention, even in the case of flat display, dimming can be performed by using the glasses (stereoscopic glasses including a right eye shutter and a left eye shutter).

In the display device described above, image processing coefficient determination means for determining an image processing coefficient of an image to be displayed based on the dimming coefficient, and image processing based on the image processing coefficient are performed on the image signal. It is preferable to include an image processing unit that outputs an image processing signal and a display unit that displays an image based on the image processing signal.
According to this invention, an image is displayed according to the light control coefficient. That is, the brightness of the image displayed on the display device and the opening / closing of the shutter of the glasses can be controlled in conjunction with each other. As a result, it is not necessary to provide dimming means in the display device, so the configuration of the display device can be simplified and the size can be reduced.

  In the display device described above, it is preferable that the display unit includes a light source and a light modulation unit that modulates light from the light source based on the image processing signal. An example of such a display device is a liquid crystal television.

  In the display device described above, the display unit may include a projection unit that projects the light modulated by the light modulation unit. An example of such a display device is a projection display device such as a projector.

  An electronic apparatus for stereoscopic vision according to the present invention includes the above-described display device and glasses having a right-eye shutter and a left-eye shutter that can be controlled to an open state or a closed state based on the control signal. preferable. According to the stereoscopic electronic device, the glasses can be provided with a dimming function, so that the configuration of the display device can be simplified.

The image display method according to the present invention displays a stereoscopic image using glasses including a right-eye shutter and a left-eye shutter, and a display device capable of displaying the right-eye image and the left-eye image in a time-sharing manner. A stereoscopic image display method, comprising: determining a dimming coefficient based on brightness information of an image signal, setting the right-eye shutter to an open state or a closed state based on the dimming coefficient, and the left eye And generating a control signal for setting the shutter for opening or closing.
According to the present invention, since the brightness of the image displayed on the display device and the opening / closing of the shutter provided in the glasses can be controlled in conjunction, the right-eye shutter and the left-eye shutter are not only switched between the left and right images. It becomes possible to function as a light control means, and the configuration of the display device can be simplified and downsized.

It is a block diagram which shows the structure of the electronic device for stereoscopic vision which concerns on embodiment of this invention. It is a block diagram which shows the detailed structure of a control part. It is a graph which shows an example of the histogram which is an analysis result of an image signal. It is a graph which shows a brightness parameter and the brightness of a screen. It is explanatory drawing for demonstrating the opening-and-closing state of the shutter for right eyes and the shutter for left eyes in a three-dimensional display. It is explanatory drawing for demonstrating the relationship between the time length of the period when the shutter for right eyes and the shutter for left eyes are an open state, and the gradation which an observer perceives. It is explanatory drawing for demonstrating the opening-and-closing state of the shutter for right eyes and the shutter for left eyes in planar display. It is explanatory drawing for demonstrating the opening-and-closing state of the shutter for right eyes and the shutter for left eyes which concerns on the modification 1 of this invention.

<A. Embodiment>
FIG. 1 is a schematic diagram of a stereoscopic electronic device D according to an embodiment of the present invention. The stereoscopic electronic device D is a display device that displays a color image having parallax with each other so as to be stereoscopically visible, and includes a projection display device 100 and glasses (stereoscopic glasses) 300. The projection display device 100 projects the projection light Lp for displaying an image onto the scattering screen 200. The observer wears glasses 300. Reflected light obtained by reflecting the projection light Lp on the surface of the scattering screen 200 passes through the glasses 300 and is perceived by the observer.

The glasses 300 include a right eye shutter 310 and a left eye shutter 320. The right-eye shutter 310 and the left-eye shutter 320 are in an open state in which light is transmitted (a state in which the shutter transmittance is 100%) or in a closed state in which light is blocked (the shutter transmittance is 0%). State) is controlled from one state to the other state or from the other state to one state. As the right-eye shutter 310 and the left-eye shutter 320, for example, a liquid crystal shutter that changes from one of the open state and the closed state to the other by changing the alignment direction of the liquid crystal according to the applied voltage can be employed. .
In addition, the projection display device 100 of this example can switch between stereoscopic display and flat display. When performing stereoscopic display, the projection display apparatus 100 displays the right-eye image and the left-eye image in a time-sharing manner. Further, the projection display apparatus 100 generates a control signal CTL for designating an open state or a closed state for the right eye shutter 310 and the left eye shutter 320.

  The projection display device 100 of this embodiment is a liquid crystal projector that uses a transmissive liquid crystal panel as a light valve 110 (110R, 110G, 110B). The liquid crystal panel is provided with a driver for driving the light valve. Inside the projection display apparatus 100, a lamp unit 102 made of a white light source such as a high-pressure mercury lamp is provided. Although it is possible to use a halogen lamp capable of changing the luminance as the light source, in this embodiment, since the luminance of the light source is not changed and dimming is not possible, the luminance cannot be changed, but the luminance is higher. Use a high-pressure mercury lamp that emits light. As a result, a bright image can be displayed.

  The light emitted from the lamp unit 102 is separated into red light, green light, and blue light by three mirrors 106 and two dichroic mirrors 108 disposed therein, and light valves corresponding to the respective color lights. 110R, 110G and 110B, respectively. These light valves are provided with polarizers, and each color light is modulated by each light valve to become polarized light.

  The polarized light of each color enters the dichroic prism 112 from three directions. In the dichroic prism 112, the projection light Lp in which red polarized light, green polarized light and blue polarized light are mixed is projected onto the scattering screen 200 via the projection lens 114. The projection light Lp is projected on the scattering screen 200.

  The control unit 50 determines the dimming coefficient K1 based on the brightness distribution of the image signal Vd supplied from the external device, and the image processing coefficient of the image to be displayed based on the dimming coefficient K1. A process for determining K2, a process for performing image processing on the image signal Vd based on the image processing coefficient K2 to generate an image processing signal Va and supplying the image processing signal Va to the light valves 110R, 110G, and 110B, and a dimming coefficient K1 And generating a control signal CTL for controlling the glasses 300.

FIG. 2 shows a detailed configuration of the control unit 50. The control unit 50 includes an image analysis unit 51 and an image processing unit 52.
The image analysis unit 51 analyzes the image signal Vd and the horizontal / vertical synchronization signal Sy supplied from the external device, and determines the dimming coefficient K1 and the image processing coefficient K2. The image processing unit 52 processes the image signal Vd based on the image processing coefficient K2 that is the analysis result of the image analysis unit 51 to generate an image processing signal Va.

  The image analysis unit 51 includes a histogram creation unit 53 that creates a brightness histogram from the image signal Vd, and a dimming coefficient determination unit 54 that determines a dimming coefficient from the created histogram. The histogram shows the gradation distribution included in the image, the vertical axis represents the frequency of appearance of the display gradation on the screen, and the horizontal axis represents the gradation.

  The dimming coefficient determination unit 54 extracts a brightness parameter characterizing the brightness of the image from the created histogram. As an extraction method, for example, a method in which the frequency is checked from the bright side and a gradation that has a certain size for the first time can be selected. For example, as shown in FIG. 3, a histogram is created by dividing the range of the minimum luminance and the maximum luminance into 64 parts. That is, the luminance is expressed with 64 gradations. Then, the frequency at each gradation is examined to obtain a total sum of frequencies. Next, a target value that is 5% of the total is calculated. Next, the frequency of the brighter gradation is subtracted from the target value, and the gradation that becomes zero is specified. In the example shown in FIG. 3, the gradation 58 is used as the brightness parameter.

Then, the dimming coefficient determination unit 54 determines the dimming coefficient K1 according to the brightness parameter. FIG. 4 shows the relationship between the brightness parameter extracted from the image signal Vd and the screen brightness. The determined dimming coefficient K1 is output to the image processing coefficient determination unit 55 and the control signal generation unit 56.
When the dimming coefficient K1 corresponding to the brightness parameter is set, the image processing coefficient determination unit 55 determines the image processing coefficient K2 so that the screen brightness becomes the brightness corresponding to the brightness parameter.

  The control signal generator 56 generates the control signal CTL based on the dimming coefficient K1, the horizontal / vertical synchronization signal Sy, and the dot clock signal Clk. The control signal CTL is a binary signal for setting the right-eye shutter 310 and the left-eye shutter 320 to an open state or a closed state. The dot clock signal Clk is a signal supplied from an external device, and is a signal that defines a period obtained by subdividing the horizontal scanning period defined by the horizontal / vertical synchronization signal Sy.

Here, a period in which the right eye shutter 310 is in the open state is referred to as an open state setting period TR, and a period in which the left eye shutter 320 is in the open state is referred to as an open state setting period TL. Note that the open state setting period TR and the open state setting period TL may be collectively referred to as an open state setting period T.
At this time, the control signal generation unit 56 generates the control signal CTL so that the time length t of the open state setting period T becomes a value corresponding to the dimming coefficient K1. Specifically, when the control signal generation unit 56 generates the control signal CTL for setting the right-eye shutter 310 that is in the closed state to the open state, the light control is performed from the timing when the right-eye shutter 310 is in the open state. The control signal CTL is generated so that the right-eye shutter 310 is set to the closed state when the open state setting period TR of the time length t corresponding to the coefficient K1 has elapsed. Similarly, when the control signal generation unit 56 generates the control signal CTL for setting the left-eye shutter 320 in the closed state to the open state, the dimming coefficient K1 from the timing when the left-eye shutter 320 is in the open state. The control signal CTL is generated so that the left-eye shutter 320 is set to the closed state when the open state setting period TL corresponding to the time length t has elapsed.

Here, when the time length t of the open state setting period T when the screen brightness is 100% (that is, when the entire screen displays a gradation corresponding to the maximum luminance) is expressed as “tmax”, The time length t of the open state setting period T is determined as t = (α) × (tmax) using a coefficient α determined based on the dimming coefficient K1. Here, the coefficient α is a real number satisfying 0 ≦ α ≦ 1.
For example, it is assumed that the brightness parameter extracted from the image signal Vd is a gradation at which the screen brightness is 50%. At this time, the dimming coefficient K1 is set to a value such that the amount of light is 50%, and the coefficient α is set to a value corresponding to the dimming coefficient K1, for example, “0.5”. In this example, the time length t of the open state setting period T is half the time length tmax of the open state setting period T when the screen brightness is 100%.
In the present embodiment, for convenience of explanation, the case where the values of the dimming coefficient K1 and the coefficient α are determined so that the coefficient α and the brightness of the screen have a proportional relationship will be described as an example. Is not limited to such an embodiment. The relationship between the dimming coefficient K1 and the coefficient α and the brightness of the screen may be appropriately determined according to the usage application of the stereoscopic electronic device D or the like. The dimming coefficient K1 and the coefficient α may be determined so as to increase as the screen brightness increases. For example, the relationship between the dimming coefficient K1 and the coefficient α and the screen brightness may be determined so that the coefficient α becomes a value of a quadratic function having the screen brightness as a variable. Further, when the screen brightness is a certain level or more, the coefficient α may be set to a constant value. For example, if the screen brightness is 10%, the coefficient α is “0.1”, 20% is “0.4”, 30% is “0.9”, and 33% or more. If there is, it may be “1”.

The right-eye shutter 310 and the left-eye shutter 320 transmit light during the open state setting period T. If the open state setting period T is shortened, the amount of light of an image recognized by a person is smaller than when the open state setting period T is long. Therefore, the light quantity of the image recognized by the person wearing the glasses 300 is driven by the image processing signal Va processed based on the image processing coefficient K2, and the light after being modulated by the liquid crystal light valves 110R, 110G, and 110B. The light is dimmed by the glasses 300 based on the dimming coefficient K1. That is, the light quantity of the image recognized by the person wearing the glasses 300 can be expressed by a function of the dimming coefficient K1 and the image processing coefficient K2.
The image processing coefficient K2 is determined so that the brightness of the screen corresponds to the brightness parameter while considering the dimming coefficient K1 in the image processing coefficient determination unit 55. However, for example, when the screen brightness is black, the amount of the projected light does not become zero even if the liquid crystal light valve 110 displays black.
On the other hand, in the present embodiment, when the screen brightness is black, the dimming coefficient K1 is zero. When the dimming coefficient K1 is zero, the light is further reduced in the glasses 300, so that it can be made closer to black. That is, in this embodiment, since the time length t of the open state setting period T is determined based on the dimming coefficient K1, an image with a large brightness parameter can be displayed brighter, while the brightness parameter has a small value. The image that becomes can be displayed darker. This makes it possible to increase the contrast ratio (dynamic contrast ratio) between the bright part in the bright image and the dark part in the dark image without changing the luminance of the light source in the lamp unit 102.

  Hereinafter, the relationship between the light control coefficient K1 and the open state setting period T of the right-eye shutter 310 and the left-eye shutter 320 when the stereoscopic electronic device D performs stereoscopic display will be described with reference to FIG. This will be described in detail.

  When the stereoscopic electronic device D performs stereoscopic display, the operation period of the stereoscopic electronic device D includes a right-eye display period Tx for displaying a right-eye image and a left-eye display for displaying a left-eye image. It can be divided into periods Ty. In the present embodiment, the right-eye display period Tx and the left-eye display period Ty are alternately arranged on the time axis. Each of the right-eye display period Tx and the left-eye display period Ty is divided into a shielding period T1 and an open period T2 subsequent to the shielding period T1.

In FIG. 5, display frames R1, R2, and R3 are a right-eye display period Tx for displaying a right-eye image, and display frames L1, L2, and L3 are for a left-eye that displays a left-eye image. This is the display period Ty. In FIG. 5, the transmittance of the right-eye shutter 310 is indicated by a solid line, and the transmittance of the left-eye shutter 320 is indicated by a dotted line.
In this example, the value of the dimming coefficient K1 is “ka” in the display frames R1 and L1, the value of the dimming coefficient K1 is “kb” in the display frames R2 and L2, and the value of the dimming coefficient K1 in the display frames R3 and L3. Changes to “kc”. The coefficient α corresponding to ka is “1”, the coefficient α corresponding to kb is “0.5”, and the coefficient α corresponding to kc is “0.25”.

When the screen brightness is 100%, the right-eye shutter 310 is set to an open state (transmittance is 100%) in the entire open period T2 in the right-eye display period Tx, and the screen brightness is 100%. If the value is smaller, the open state is set in a part of the open period T2 in the right-eye display period Tx. Specifically, the time length t of the open state setting period TR of the right-eye shutter 310 is set to a value equal to the time length of the open period T2 when the screen brightness is 100%. Is smaller than 100%, it is set to a value obtained by multiplying the time length of the open period T2 by the coefficient α.
Similarly, when the screen brightness is 100%, the left-eye shutter 320 is set to the open state (transmittance is 100%) in the entire open period T2 in the left-eye display period Ty. Is a value smaller than 100%, the open state is set in a part of the open period T2 in the display period Ty for the left eye. That is, the time length t of the open state setting period TL of the left-eye shutter 320 is set to a value equal to the time length of the open period T2 when the screen brightness is 100%, and the screen brightness is 100%. Is set to a value obtained by multiplying the time length of the open period T2 by the coefficient α.

In the example shown in FIG. 5, the time length t of the open state setting period T in the display frame R1 and the display frame L1 is expressed as “ta”, and the time length t of the open state setting period T in the display frame R2 and the display frame L2 is expressed as “ tb ”, and the time length t of the open state setting period T in the display frame R3 and the display frame L3 is represented as“ tc ”.
At this time, the time length ta is obtained by integrating the time length of the open period T2 (that is, the time length tmax of the open state setting period T when the screen brightness is 100%) and the coefficient α corresponding to ka. It becomes the value. The time length tb is a value obtained by integrating the time length of the open period T2 and the coefficient α corresponding to kb. The time length tc is a value obtained by integrating the time length of the open period T2 and the coefficient α corresponding to kc. That is, the time length ta is equal to the time length tmax, the time length tb is 0.5 times the time length tmax, and the time length tc is 0.25 times the time length tmax.

The right-eye shutter 310 and the left-eye shutter 320 are set in a closed state (transmittance is 0%) in the shielding period T1 in both the right-eye display period Tx and the left-eye display period Ty.
In the shielding period T1 of the right-eye display period Tx, the right-eye image displayed in the right-eye display period Tx and the left-eye display period Ty immediately before the right-eye display period Tx are displayed. Mixed with ophthalmic images. Similarly, in the shielding period T1 of the left-eye display period Ty, the left-eye image displayed in the left-eye display period Ty and the right-eye display period Tx immediately before the left-eye display period Ty are displayed. Mixed with the right-eye image.
On the other hand, in the present embodiment, by closing both the right-eye shutter 310 and the left-eye shutter 320 in the shielding period T1 of the right-eye display period Tx and the left-eye display period Ty, The right-eye image is transmitted through the left-eye shutter 320, and the left-eye image is prevented from transmitting through the right-eye shutter 310. This prevents the viewer from perceiving the mixture of the right eye image and the left eye image (crosstalk) and allows the viewer to recognize a clear stereoscopic effect.

FIG. 6 is an explanatory diagram showing the relationship between the time length t of the open state setting period T and the gradation G perceived by the observer in the example shown in FIG.
As shown in FIG. 6, when the time length of the open state setting period T is ta, the observer is that the maximum value of the gradation of the image displayed in the display frame R1 and the display frame L1 is G1a, and the minimum value is Perceived as G2a. The contrast ratio in this case is a value based on the ratio CRa of the maximum gradation value G1a to the minimum gradation value G2a. When the time length of the open state setting period T is tc, the observer perceives that the maximum value of the gradation of the images displayed in the display frame R3 and the display frame L3 is G1c and the minimum value is G2c. To do. The contrast ratio in this case is a value based on the ratio CRc of the maximum gradation value G1c to the minimum gradation value G2c.
On the other hand, the ratio DRC between the maximum gradation value perceived by the observer in a bright image (eg, G1a) and the minimum gradation value perceived by the observer in a dark image (eg, G2c) is the ratio CRa described above. And larger than the ratio CRc. Therefore, in this embodiment, the contrast ratio (dynamic contrast ratio) between the bright part in the bright image and the dark part in the dark image can be increased, and a clear moving image can be displayed.

  Next, referring to FIG. 7, the relationship between the light control coefficient K1 and the open state setting period T of the right eye shutter 310 and the left eye shutter 320 when the stereoscopic electronic device D performs planar display. Will be described in detail.

When the stereoscopic electronic device D performs planar display, the operation period of the stereoscopic electronic device D is configured as a repetition of the open period T2. That is, unlike the case of performing stereoscopic display, the shielding period T1 is not provided, and there is no distinction between the right-eye display period Tx and the left-eye display period Ty.
In this case, the control signal generator 56 generates the control signal CTL such that the right eye shutter 310 and the left eye shutter 320 are simultaneously opened and closed in each open period T2. More specifically, the control signal generator 56 determines that the time length t of the open state setting period T is the time length obtained by integrating the time length of the open period T2 and the coefficient α determined based on the dimming coefficient K1. As described above, the control signal CTL is generated.

As in the example shown in FIG. 7, the value of the dimming coefficient K1 in the display frame V1 is “ka”, the value of the dimming coefficient K1 in the display frame V2 is “kb”, and the value of the dimming coefficient K1 in the display frame V3 is In the case of “kc”, the time length ta of the open state setting period T in the display frame V1 is a value obtained by integrating the time length of the open period T2 and the coefficient α corresponding to ka, and the open state setting in the display frame V2 The time length tb of the period T is a value obtained by integrating the time length of the open period T2 and the coefficient α corresponding to kb, and the time length tc of the open state setting period T in the display frame V3 is the time length of the open period T2. And a coefficient α corresponding to kc. Then, the control signal generation unit 56 generates a control signal CTL that causes the right-eye shutter 310 and the left-eye shutter 320 to be in the open state in the open state setting period T in the display frames V1, V2, and V3.
As described above, when the stereoscopic electronic device D performs planar display, the glasses 300 function only as a light control unit and do not function as a shutter.

As described above, in the present embodiment, the glasses 300 are caused to function as dimming means by controlling the opening and closing of the right-eye shutter 310 and the left-eye shutter 320. There is no need to provide means. Therefore, the configuration of the projection display device 100 can be greatly simplified.
Further, since the control signal CTL is a binary signal for setting the right-eye shutter 310 and the left-eye shutter 320 to an open state or a closed state, the configuration of the control signal generation unit 56 that generates the control signal CTL is simplified. Can be.
In the glasses 300, since the shutters (the right eye shutter 310 and the left eye shutter 320) are also used as the light control means, the glasses 300 can also perform light control without adding a special configuration.
In addition, since it is not necessary to vary the luminance of the light source, a light source with sufficient luminance can be used, and a bright image can be displayed.

<B. Modification>
The present invention is not limited to the above-described embodiments, and for example, the following modifications are possible. Also, two or more of the modifications shown below can be combined.

(1) Modification 1
In the embodiment described above, when the stereoscopic electronic device D performs stereoscopic display, the right-eye display period Tx and the left-eye display period Ty are alternately arranged on the time axis. However, the present invention is not limited to such an embodiment. For example, two consecutive right-eye display periods Tx and two consecutive left-eye display periods Ty may be set as one unit, and this may be repeated.

FIG. 8 is an explanatory diagram for explaining an open state setting period T of the stereoscopic electronic device D according to the first modification. As shown in FIG. 8, each unit period Tu is composed of two consecutive right-eye display periods Tx and two consecutive left-eye display periods Ty.
Here, of the two consecutive right-eye display periods Tx, the first right-eye display period Tx is referred to as “first right-eye display period Tx”, and the second right-eye display period Tx. Tx is referred to as “the last right-eye display period Tx”. Of the two consecutive left eye display periods Ty, the first left eye display period Ty is referred to as the “first left eye display period Ty”, and the second left eye display period Ty. Is referred to as the “last left eye display period Ty”. At this time, in the last right-eye display period Tx, the stereoscopic electronic device D displays the same image as the right-eye image displayed in the first right-eye display period Tx immediately before the period. Similarly, in the last left-eye display period Ty, the same image as the left-eye image displayed in the first left-eye display period Ty immediately before the period is displayed.

In the first right-eye display period Tx, the right-eye image displayed in the period and the left-eye image displayed in the last left-eye display period Ty immediately before the period are mixed. Similarly, in the first left-eye display period Ty, the left-eye image displayed in the period and the right-eye image displayed in the last right-eye display period Tx immediately before the period are mixed.
Therefore, in the first modification, unlike the embodiment, the relationship between the right eye display period Tx and the left eye display period Ty, and the shielding period T1 and the open period T2 is determined as follows.
That is, the stereoscopic electronic device D according to the first modification uses the first right-eye display period Tx and the first left-eye display period Ty as the shielding period T1, and the right-eye shutter 310 and the left-eye shutter 320 Both are controlled to be closed. On the other hand, the stereoscopic electronic device D according to the first modification uses the last right-eye display period Tx as the open period T2, and is determined by the coefficient α calculated based on the dimming coefficient K1 in the open period T2. In the open state setting period TR, the right-eye shutter 310 is controlled to be in the open state. Similarly, the stereoscopic electronic device D according to the first modification uses the last left-eye display period Ty as the open period T2, and uses the coefficient α calculated based on the dimming coefficient K1 in the open period T2. In the set open state setting period TL, the left eye shutter 320 is controlled to be in the open state.
In the last right-eye display period Tx, the right-eye image displayed in the period and the right-eye image displayed in the right-eye display period Tx immediately before the period are mixed. These two images Since both are images for the right eye, the observer does not perceive a mixture of the image for the right eye and the image for the left eye. Similarly, in the last left-eye display period Ty, only the left-eye image is displayed, and the mixture of the right-eye image and the left-eye image is not perceived by the observer.
As described above, the stereoscopic electronic device D according to the modified example 1 prevents the observer from perceiving the mixture of the right-eye image and the left-eye image (crosstalk), and the observer has a clear stereoscopic image. It is possible to recognize a feeling.

(2) Modification 2
In the embodiment and the modification described above, the projection display device using the light valve is illustrated as an example of the display device, but the present invention is not limited to this, and is a projection display device using a digital mirror device. Alternatively, it may be a liquid crystal display device such as a liquid crystal television or an electro-optical device such as an organic EL display device. In short, any display device that can display in combination with glasses capable of controlling the opening and closing of the shutter may be used.

(3) Modification 3
In the embodiment and the modification described above, the image analysis unit 51 generates a brightness histogram in the analysis of the image signal Vd, and the dimming coefficient determination unit 54 determines the dimming coefficient from the histogram. The information is not limited to this, and any information may be used as long as the image analysis unit 51 analyzes the brightness of the image signal Vd. For example, the image analysis unit 51 analyzes the average value or maximum value of the gradation of one screen and outputs it as brightness information of the image signal Vd, and the dimming coefficient determination unit 54 adjusts the brightness based on this. The light coefficient may be determined.

DESCRIPTION OF SYMBOLS 100 ... Projection type display apparatus, 50 ... Control part, 51 ... Image analysis part, 52 ... Image processing part, 53 ... Histogram preparation part, 54 ... Dimming coefficient determination part, 55 ... Image processing coefficient determination part, 56 ... Control signal Generating unit, 200 ... scattering screen, 300 ... glasses, 310 ... shutter for right eye, 320 ... shutter for left eye.

Claims (8)

A control signal for setting the right-eye shutter and the left-eye shutter to an open state or a closed state is output to the glasses having the right-eye shutter and the left-eye shutter, and the right-eye image and the left-eye shutter A display device capable of displaying images in a time-sharing manner,
A dimming coefficient determining means for determining a dimming coefficient based on brightness information of the image signal;
Control signal generating means for generating the control signal based on the dimming coefficient;
A display device comprising: Each of the display period for the right eye that is a period for displaying the image for the right eye and the display period for the left eye that is a period for displaying the image for the left eye consists of a shielding period and an open period,
When the control signal generating means performs stereoscopic display,
In the shielding period of the right eye display period, the right eye shutter and the left eye shutter are set in a closed state,
In the open period of the right-eye display period, the left-eye shutter is set in a closed state, and in the open period, the right-eye shutter is in an open state in a period of time corresponding to the dimming coefficient Set to
In the shielding period of the left eye display period, the right eye shutter and the left eye shutter are set in a closed state,
In the open period of the left-eye display period, the right-eye shutter is set in a closed state, and in the open period, the left-eye shutter is in an open state in a period of time corresponding to the dimming coefficient The display device according to claim 1, wherein the control signal is generated to be set as follows. When the control signal generation unit performs flat display, a period during which the right-eye shutter is set to an open state and a period during which the left-eye shutter is set to an open state are in accordance with the dimming coefficient. The display device according to claim 1, wherein the control signal is generated so as to have a time length. Image processing coefficient determination means for determining an image processing coefficient of an image to be displayed based on the dimming coefficient;
Image processing means for performing image processing on the image signal based on the image processing coefficient and outputting an image processing signal;
Display means for displaying an image based on the image processing signal;
The display device according to any one of claims 1 to 3, further comprising: The display device according to claim 4, wherein the display unit includes a light source and a light modulation unit that modulates light from the light source based on the image processing signal. The display device according to claim 5, wherein the display unit includes a projection unit that projects the light modulated by the light modulation unit. The display device according to any one of claims 1 to 6,
Glasses having a right-eye shutter and a left-eye shutter that can be controlled to an open state or a closed state based on the control signal;
A stereoscopic electronic device comprising: A stereoscopic image display method for displaying a stereoscopic image using glasses including a shutter for a right eye and a shutter for a left eye and a display device capable of displaying a right eye image and a left eye image in a time-sharing manner,
Determine the dimming coefficient based on the brightness information of the image signal,
Based on the dimming coefficient, generating a control signal for setting the right-eye shutter in an open state or a closed state and setting the left-eye shutter in an open state or a closed state;
An image display method characterized by the above.

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