JP2015038559A - Drive circuit, display device, electronic equipment, and drive method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent crosstalk upon displaying a stereoscopic image.SOLUTION: Light transmitted through a liquid crystal panel 100WB reaches liquid crystal panels 100R, 100G, 100B. In the liquid crystal panels 100R, 100G, 100B, an image for a left eye and an image for a right eye are alternately written in a line-sequence system from a pixel in the first row. In the liquid crystal panel 100WB, pixels in an upper half are controlled to be transmissive and pixels in a lower half are controlled to be non-transmissive from the time when scanning rows in an upper half of the liquid crystal panels 100R, 100G, 100B is completed until scanning the lowermost row is completed. In the liquid crystal panel 100WB, pixels in the lower half are controlled to be transmissive and pixels in the upper half are controlled to be non-transmissive from the time when scanning rows in the lower half of the liquid crystal panels 100R, 100G, 100B is completed until scanning in the next lower half is started.

Description

  The present invention relates to a technique for displaying a right-eye image and a left-eye image so that an observer perceives a stereoscopic effect.

  Patent Document 1 discloses a system that has a liquid crystal panel and performs 3D display by a frame sequential method. In this liquid crystal panel, line-sequential scanning is performed from the upper side to the lower side of the screen, and right-eye video and left-eye video are alternately written. Also, in the ornamental glasses of this system, the shutter on the right eye side and the left eye side corresponding to the written image has the response of the lowermost liquid crystal after the response of the liquid crystal at the center of the screen is completed. Will be released by the time it is completed. In addition, the display device according to this system has a backlight including a light source for irradiating light on the upper half area of the display area and a light source for irradiating light on the upper half area. . This display device turns on the light source that irradiates light to the upper half area for a predetermined period from the time when the response of the upper half liquid crystal of the display area is completed, while the lower half of the display area does not complete the response of the liquid crystal. The light source that irradiates the area with light is turned off. The display device turns off the light source that emits light to the upper half area for a predetermined period immediately before the response of the liquid crystal at the bottom of the display area is completed, while the light is applied to the lower half area where the response of the liquid crystal is completed. Turn on the light source. In the first half of the shutter release period, the lower half of the image has not been rewritten. However, during this period, the lower half of the display area is off, so the lower half of the image is visible. There is nothing to do. In the second half of the shutter release period, rewriting of the next image starts from the upper part of the display area. In this period, the backlight of the upper half of the display area is turned off. Is not visually recognized.

JP 2011-128548 A

  By the way, in the display device disclosed in Patent Document 1, a light source for irradiating light on the upper half of the display region is disposed above one light guide plate, and the display region is disposed below the light guide plate. A light source for irradiating light to the lower half area is arranged. Here, since there is only one light guide plate, for example, when the upper light source is turned on, there is a risk that light may reach not only the upper half but also the lower side of the center, and an image below the center may be seen. In addition, when the lower light source is turned on, light may reach not only the lower half but also the upper side of the center, and an image above the center may be seen.

  The present invention has been made in view of the above-described circumstances, and one of its purposes is to prevent crosstalk from occurring when displaying a stereoscopic image.

In order to achieve the above object, a drive circuit according to the present invention includes a first modulation unit that modulates incident light and a second modulation unit that modulates incident light, and is modulated by the first modulation unit. Drive circuit that drives a device that modulates and emits the emitted light by the second modulation unit or modulates and emits the light modulated by the second modulation unit by the first modulation unit. Of the first field and the second field, one of a right-eye image and a left-eye image is formed in the first field by driving the first modulation unit in a line-sequential manner, and the other in the second field. The first modulation unit is driven in a line sequential manner, and the second modulation unit is driven so that the other image is not emitted in the second half of the first field and the first half of the second field. , The second half of the second field and the first field In the first half, the one image is to drive the second modulation section so as not to be emitted.
According to this configuration, it is possible to prevent crosstalk from occurring when displaying a right-eye image and a left-eye image for stereoscopic viewing.

In the driving circuit, in the first half of the first field and the first half of the second field, an image formed by a portion that is not driven in the first half in the first modulation unit is emitted, and the first circuit The second modulation unit is driven so that an image formed by the portion driven in the first half in the modulation unit is not emitted, and the first field is the second half of the first field and the second half of the second field. The second modulation unit is driven so that the image formed in the part not driven in the second half is emitted in the modulation unit and the image formed in the part driven in the second half is not emitted in the first modulation unit. It is good also as composition to do.
According to this configuration, the image formed in the first half of the first field is emitted in the second half of the first field, and the image formed in the second half of the first field is emitted in the first half of the second field, The image formed in the first half is emitted in the second half of the second field, and the image formed in the second half of the second field is emitted in the first half of the next first field. In the second half of the first field and the first half of the second field, only one video is emitted and the other video is not emitted. In the second half of the second field and the first half of the next first field, only the other video is emitted. Is emitted and one image is not emitted, so that crosstalk does not occur.

In the driving circuit, in the first half of the first field and the first half of the second field, the second modulation unit is doubled to the first modulation unit so that light is not emitted from the second modulation unit. In the second half of the first field and the second half of the second field, the second modulation unit is doubled with respect to the first modulation unit so that light is emitted from the second modulation unit. It is good also as a structure driven at this speed.
According to this configuration, only one image is emitted from the second half start of the first field to the first half end of the second field, and from the second half start of the second field to the first half end of the next first field. Since only the other image is emitted, no crosstalk occurs.

In the driving circuit, in the second half of the first field, the second modulation unit is driven at a speed twice that of the first modulation unit in accordance with the one image, and in the second half of the second field. In this case, the second modulation unit may be driven at a speed twice that of the first modulation unit in accordance with the other video.
According to this configuration, since the second modulation unit also contributes to the gradation of the video, high contrast can be obtained.

In order to achieve the above object, a display device according to the present invention includes a first modulation unit that modulates incident light and a second modulation unit that modulates incident light, and the first modulation unit modulates the light. A device that emits light modulated by the second modulation unit and emits light modulated by the second modulation unit by the first modulation unit, wherein the first field switches alternately. Of the second fields, one of the right-eye video and the left-eye video is formed by driving the first modulation unit in a line-sequential manner in the first field, and the other video is formed in the second field. The first modulation unit is formed by line-sequential driving, and the second modulation unit is driven so that the other image is not emitted in the second half of the first field and the first half of the second field, and the second In the second half of the field and the first half of the first field Wherein one of the picture drives the second modulation section so as not to be emitted.
According to this configuration, it is possible to prevent crosstalk from occurring when displaying a right-eye image and a left-eye image for stereoscopic viewing.

  Note that the present invention can be applied to a driving method and an electronic device including the display device in addition to a driving circuit.

1 is a diagram showing an apparatus that constitutes a display system 1. FIG. FIG. 3 is a block diagram showing a hardware configuration of the display device 10. The figure which showed the structure of the projection part 17. FIG. FIG. 3 is a diagram illustrating a configuration of a liquid crystal panel 100. FIG. 6 is a diagram showing an equivalent circuit of the pixel 110. The block diagram which showed the structure which controls liquid crystal panel 100WB. The figure for demonstrating operation | movement of 1st Embodiment. The figure which showed the structure of the projection part 17 which concerns on 2nd Embodiment. The figure for demonstrating operation | movement of 2nd Embodiment. The figure which showed the structure of the projection part 17 which concerns on a modification. The figure which showed the structure of the projection part 17 which concerns on a modification.

[First Embodiment]
FIG. 1 is a diagram showing an apparatus constituting a display system 1 according to an embodiment of the present invention. The display system 1 includes a display device 10 and glasses 20. The display device 10 is an example of an electronic device that projects the video represented by the input video signal onto the screen SC. The display device 10 projects an image for viewing a stereoscopic image on the screen SC. In the present embodiment, a frame sequential method is employed as a method for viewing stereoscopic video. For this reason, the display device 10 alternately displays the right-eye video (hereinafter referred to as “right-eye video”) and the left-eye video (hereinafter referred to as “left-eye video”) in a time-sharing manner. Project to.

  The screen SC is obtained by applying white paint on the surface of the fabric, and displays an image projected by the display device 10. The glasses 20 are electronic devices for causing the right eye image projected on the screen SC to reach the viewer's right eye, and causing the left eye image projected on the screen SC to reach the viewer's left eye. It has two liquid crystal shutters. When the viewer wears the glasses 20, one liquid crystal shutter is positioned in front of the right eye, and the other liquid crystal shutter is positioned in front of the left eye.

(Configuration of display device 10)
FIG. 2 is a diagram illustrating a hardware configuration of the display device 10. As shown in FIG. 2, each part of the display device 10 is connected by a bus 11. The control unit 12 includes a CPU (Central Processing Unit) 12A, a ROM (Read Only Memory) 12B, and a RAM (Random Access Memory) 12C. When the CPU 12A executes a program stored in the ROM 12B, a function of projecting an image represented by a video signal input from an external device onto the screen SC, a function of transmitting a signal to the glasses 20 using infrared rays, and the like are realized. . The operation unit 14 includes a plurality of buttons for operating the display device 10. The control unit 12 detects the operated button, and controls each unit according to the operated button. The control unit 12 controls each unit in accordance with the operated button, so that the image quality of the image projected on the screen SC can be adjusted. The storage unit 13 has a non-volatile memory, and stores adjusted image quality parameters and the like.

  The video acquisition unit 16 acquires a video signal from an external device. This video signal includes a synchronization signal Sync including a vertical synchronization signal, a horizontal synchronization signal, and a dot clock signal. The video acquisition unit 16 has a memory for storing a video signal, and supplies the video signal to the projection unit 17. When the video signal is a video signal for viewing a stereoscopic video, the video acquisition unit 16 alternately supplies the video signal for the right eye video and the video signal for the left eye video to the projection unit 17. When the video acquisition unit 16 supplies the right-eye video signal, the video signal representing the right-eye red video, the video signal representing the right-eye green video, A video signal representing a blue video for the right eye is generated, and the video signal of each color is supplied to the projection unit 17. In addition, when the video acquisition unit 16 supplies the video signal for the left eye, the video signal representing the red video for the left eye from the acquired video signal, the video signal representing the green video for the left eye, and A video signal representing a blue video for the left eye is generated, and the video signal of each color is supplied to the projection unit 17. The video acquisition unit 16 determines whether the video supplied to the projection unit 17 is a right-eye video or a left-eye video, and data indicating the determination result (hereinafter referred to as “discrimination result data”). Then, the vertical synchronization signal included in the video signal is supplied to the communication unit 15.

  The communication unit 15 includes an LED (Light Emitting Diode) that emits infrared rays. The LED is turned on and off based on the vertical synchronization signal and the determination result data, and transmits a signal for controlling the opening and closing of the liquid crystal shutter of the glasses 20. The glasses 20 control the opening and closing of the liquid crystal shutter according to this signal, and at the timing when the image for the right eye is projected on the screen SC, the liquid crystal shutter for the left eye is opened while the liquid crystal shutter for the right eye is opened. At the timing when the shutter is closed and the left-eye image is projected on the screen SC, the left-eye liquid crystal shutter is opened while the right-eye liquid crystal shutter is closed.

  FIG. 3 is a diagram showing the configuration of the projection unit 17. The projection unit 17 includes a light source 1201, dichroic mirrors 1202 and 1203, mirrors 1204 to 1206, a dichroic prism 1207, a projection lens 1208, and liquid crystal panels 100R, 100G, 100B, and 100WB.

  The light source 1201 includes a lamp that emits light. Examples of the lamp include a metal halide lamp, a halogen lamp, and a xenon lamp. The liquid crystal panel 100WB (second modulation unit) is a transmissive liquid crystal panel that modulates incident light, and the transmittance is controlled by a circuit described later. Light emitted from the light source 1201 and transmitted through the liquid crystal panel 100WB enters the dichroic mirror 1202. The dichroic mirror 1202 is a mirror that transmits light in the red wavelength band and reflects light in the green wavelength band and the blue wavelength band. The light transmitted through the dichroic mirror 1202 is reflected by the mirror 1204 and enters the liquid crystal panel 100R. The dichroic mirror 1203 is a mirror that reflects light in the green wavelength band and transmits light in the blue wavelength band among the light reflected by the dichroic mirror 1202. The light reflected by the dichroic mirror 1203 enters the liquid crystal panel 100G. The mirror 1205 and the mirror 1206 are mirrors that reflect the light transmitted through the dichroic mirror 1203. The light reflected by the mirror 1205 and the mirror 1206 enters the liquid crystal panel 100B.

  The liquid crystal panel 100R, the liquid crystal panel 100G, and the liquid crystal panel 100B are transmissive liquid crystal panels (first modulation units) that modulate incident light, and include pixels arranged in a plurality of rows and a plurality of columns. In the liquid crystal panel 100R, each pixel is controlled in accordance with a video signal representing a red video, and the transmittance of each pixel changes. Since the light incident on the liquid crystal panel 100R is light in the red wavelength band, the light transmitted through the liquid crystal panel 100R becomes a red image. In the liquid crystal panel 100B, each pixel is controlled in accordance with a video signal representing a blue video, and the transmittance of each pixel changes. Since the light incident on the liquid crystal panel 100B is light in the blue wavelength band, the light transmitted through the liquid crystal panel 100B becomes a blue image. In the liquid crystal panel 100G, each pixel is controlled in accordance with a video signal representing a green video, and the transmittance of each pixel changes. Since the light incident on the liquid crystal panel 100G is light in the green wavelength band, the light transmitted through the liquid crystal panel 100G becomes a green image. The liquid crystal panel 100R, the liquid crystal panel 100G, and the liquid crystal panel 100B have different configurations except for the wavelength of incident light and the video signal to be driven. In this case, the liquid crystal panel 100 is referred to.

  The dichroic prism 1207 is a prism that changes the traveling direction of the light in the red wavelength band and the blue wavelength band by causing the incident light in the green wavelength band to go straight and reflecting the light in the incident red wavelength band and the blue wavelength band. The green image light incident on the dichroic prism 1207 travels straight and enters the projection lens 1208. Also, red and blue video light that has entered the dichroic prism 1207 and whose traveling direction has been changed also enters the projection lens 1208. The projection lens 1208 is a lens that magnifies and projects the image represented by the incident light onto the screen. When the light incident from the dichroic prism 1207 passes through the projection lens 1208, the image for the right eye and the image for the left eye are alternately projected on the screen.

  FIG. 4 is a diagram showing the configuration of the liquid crystal panel 100. In the liquid crystal panel 100, m rows of scanning lines 112 are provided, and n columns of data lines 114 are provided so as to be electrically insulated from the respective scanning lines 112. The pixels 110 are arranged corresponding to the intersections of the m rows of scanning lines 112 and the n columns of data lines 114, respectively. Therefore, in this embodiment, the pixels 110 are arranged in a matrix with m rows × n columns. In the present embodiment, the area in which the pixels 110 are arranged in this way is the display area 101.

  Around the display area 101, a scanning line driving circuit 130 and a data line driving circuit 140 are provided. The scanning line driving circuit 130 supplies scanning signals to the 1 to m rows of scanning lines 112, respectively. In the present embodiment, the scanning line driving circuit 130 selects the scanning line 112 in the order of the first, second, third,..., Mth rows by the control signal Yctr, and uses the scanning signal to the selected scanning line as a selection voltage. On the other hand, other scanning signals to scanning lines related to non-selection are set as non-selection voltages. Note that the scanning signals supplied to the scanning lines 112 in the first, second, third,..., M-th rows are denoted as G1, G2, G3,. The data line driving circuit 140 drives the pixel 110 by a so-called voltage modulation method based on the supplied data signal Vx. The data line drive circuit 140 samples the data signal Vx in accordance with the control signal Xctr supplied from the drive control circuit 200, and supplies the data signal of the voltage obtained by the sampling to the data lines 114 in the 1st to nth columns. The data signals supplied to the data lines 114 in the 1, 2, 3,..., Nth column are denoted as d1, d2, d3,.

  FIG. 5 is a diagram illustrating an example of an equivalent circuit of the pixel 110 in the liquid crystal panel 100. As shown in this figure, the pixel 110 includes a liquid crystal element 120 in which the liquid crystal 105 is sandwiched between the pixel electrode 118 and the common electrode 108, and a data line 114 and a pixel electrode 118 when a selection voltage is applied to the scanning line 112. And a thin film transistor (hereinafter simply referred to as “TFT”) 116 which is in a conductive state and becomes a non-conductive state when a non-selection voltage is applied. Note that the common electrode 108 is common to each pixel, and the voltage LCcom is applied by a circuit not shown. In the pixel 110, an auxiliary capacitor (storage capacitor) 125 is provided in parallel with the liquid crystal element 120. The auxiliary capacitor 125 has one end connected to the pixel electrode 118 and the other end commonly connected to the capacitor line 115. The capacitor line 115 is maintained at a constant voltage over time. In such a configuration, in the pixel 110, when a selection voltage is applied to the scanning line 112, the TFT 116 becomes conductive, and the voltage of the data signal supplied to the data line 114 is applied to the pixel electrode 118. On the other hand, when the application of the selection voltage to the scanning line 112 is completed and the non-selection voltage is applied, the TFT 116 becomes non-conductive, but the liquid crystal element 120 has the pixel electrode 118 when the TFT 116 is conductive. The voltage of the data signal applied to is held until the selection voltage is again applied to the scanning line 112 due to its capacitance. The molecular alignment state of the liquid crystal 105 changes according to the voltage applied to the liquid crystal element 120.

Returning to FIG. 4, the drive control circuit 200 is a drive circuit that drives the liquid crystal panel 100 by controlling the scanning line drive circuit 130 and the data line drive circuit 140 in accordance with the video signal supplied from the video acquisition unit 16. The drive control circuit 200 is provided in each of the liquid crystal panels 100R, 100G, and 100B. The video signal supplied to the drive control circuit 200 corresponding to the liquid crystal panel 100R is a video signal representing a red video, and the video signal supplied to the drive control circuit 200 corresponding to the liquid crystal panel 100G is a green video. The video signal supplied to the drive control circuit 200 corresponding to the liquid crystal panel 100B is a video signal representing a blue video.
The video signal supplied to the drive control circuit 200 includes a synchronization signal Sync and a signal that defines the gradation level of each pixel in the liquid crystal panel 100. The drive control circuit 200 generates various control signals such as the control signal Xctr and the control signal Yctr from the synchronization signal Sync included in the supplied video signal. The drive control circuit 200 supplies the control signal Xctr to the data line driving circuit 140 and supplies the control signal Yctr to the scanning line driving circuit 130. The drive control circuit 200 generates a data signal Vx from the gradation level of each pixel included in the supplied video signal, and supplies the generated data signal Vx to the data line drive circuit 140.

The configuration of the liquid crystal panel 100WB is different from that of the liquid crystal panel 100. Specifically, the liquid crystal panel 100WB has pixels arranged in a plurality of rows and a plurality of columns, but the arrangement of the scanning lines 112 and the data lines 114 is different, and the upper half of the pixels in the plurality of rows has the maximum transmittance, The first state in which the lower half pixels of the plurality of rows have the minimum transmittance, the upper half pixels of the plurality of rows have the minimum transmittance, and the lower half pixels of the plurality of rows have the maximum transmittance. There are two states, a third state in which all the pixels have the maximum transmittance, and a fourth state in which all the pixels have the minimum transmittance. As shown in FIG. 6, a drive control circuit 200WB for controlling the liquid crystal panel 100WB is provided for the liquid crystal panel 100WB. The drive control circuit 200WB is a drive circuit that drives the liquid crystal panel 100WB in accordance with the synchronization signal Sync supplied from the video acquisition unit 16. The drive control circuit 200WB controls the liquid crystal panel 100WB so as to be in any one of the first state to the fourth state described above.
Note that the drive control circuit 200, the drive control circuit 200WB, the liquid crystal panel 100, and the liquid crystal panel 100WB are examples of a display device that displays an image.

(Operation example of the first embodiment)
Next, an operation example when observing a stereoscopic image with the display system 1 according to the first embodiment will be described. First, when the video signal of the left-eye video is supplied to the display device 10, the drive control circuit 200 supplies the control signal Yctr to the scanning line drive circuit 130. In addition, the drive control circuit 200 supplies the control signal Xctr and the data signal Vx for projecting the left-eye video to the data line drive circuit 140. Thereby, the left-eye video is written on the liquid crystal panel 100.

FIG. 7A shows the temporal transition of the scanning lines selected by the scanning signals G1 to Gm, where 1 to m rows of the scanning lines 112 of the liquid crystal panel 100 are taken on the vertical axis and the time is taken on the horizontal axis. Show. Note that the temporal transition of the selected scanning line 112 is indicated by a solid line that descends to the right in FIG. Since the pixels related to each scanning line 112 are driven when the scanning line 112 is selected, the period for displaying an image corresponding to the data signal Vx in the pixels 110 in each row of the display region 101 is shown in FIG. As shown in the above, it will be different for each row. In the present embodiment, the scanning period for one frame is 1/60 second, and the scanning period for the left-eye video (first field) and the scanning period for the right-eye video (second field) are respectively 1/120 seconds.
When the writing of the left-eye video to the liquid crystal panel 100 from time t1 is completed (time t3), the drive control circuit 200 controls the liquid crystal panel 100 based on the video signal of the right-eye video supplied next. . Then, as shown in FIG. 7A, writing of the right-eye video starts from time t3, and writing of the right-eye video ends at time t5. Since the video signal for the left eye video and the video signal for the right eye video are supplied to the display device 10 alternately, the operations of the drive control circuit 200 and the liquid crystal panel 100 are the same as those for the left eye video and the right eye video. The above operation is performed every time a video signal is supplied.

Next, the operation of the liquid crystal panel 100WB will be described. When the video signal for the left-eye video is supplied to the display device 10, the drive control circuit 200WB is supplied with the synchronization signal Sync included in the video signal. Based on the vertical synchronization signal included in the synchronization signal Sync, the drive control circuit 200WB sets the upper half pixel of the liquid crystal panel 100WB to the minimum transmittance and sets the lower half pixel to the maximum at the time point t1 (time point t5). Transmittance. The drive control circuit 200WB finishes writing to the liquid crystal panel 100 in the upper half of the left-eye video image at the time point t2 (time point t6) when the selection of the scanning line 112 in the m / 2th row is completed in the liquid crystal panel 100. At that time, the upper half pixel of the liquid crystal panel 100WB is set to the maximum transmittance, and the lower half pixel is set to the minimum transmittance.
In addition, when the video signal of the right eye video is supplied to the display device 10, the drive control circuit 200WB is supplied with the synchronization signal Sync included in the video signal. Based on the vertical synchronization signal included in the synchronization signal Sync, the drive control circuit 200WB sets the upper half pixel of the liquid crystal panel 100WB to the minimum transmittance and sets the lower half pixel to the maximum transmittance at time t3. To do. When the drive control circuit 200WB finishes selecting the m / 2th row scanning line 112 in the liquid crystal panel 100, that is, when the writing to the liquid crystal panel 100 in the upper half of the right-eye video image is completed, The upper half pixel of the liquid crystal panel 100WB is set to the maximum transmittance, and the lower half pixel is set to the minimum transmittance.

  FIG. 7B shows a temporal transition of light transmission in the display area when the vertical direction of the display area of the liquid crystal panel 100WB is taken on the vertical axis and the time is taken on the horizontal axis. When the drive control circuit 200WB performs the above-described operation, as shown in FIG. 7B, in the period from the time point t1 to the time point t2, from the time point t3 to the time point t4, and from the time point t5 to the time point t6. In the liquid crystal panel 100WB, the upper half pixels are in a non-transmissive state and the lower half pixels are in a transmissive state. In the period from time t2 to time t3, from time t4 to time t5, and from time t6 to time t7, the liquid crystal panel 100WB has the upper half pixels in the transmissive state and the lower half pixels in the non-transmissive state. It becomes.

FIG. 7D shows the temporal transition of the image projected on the screen SC when the vertical direction of the image projected on the screen SC is taken on the vertical axis and the time is taken on the horizontal axis.
In the period from the time point t1 to the time point t2, the left-eye video is written in the upper half of the display area of the liquid crystal panel 100. However, the upper half of the liquid crystal panel 100WB is in a non-transparent state. Since half of the pixels are in the transmissive state, as shown in FIG. 7D, the upper half of the screen SC does not display an image, and the lower half displays a written right-eye image.
In the period from the time point t2 to the time point t3, the left-eye video is written in the lower half of the display area of the liquid crystal panel 100, but the upper half of the liquid crystal panel 100WB is in a transmissive state and the lower half. Thus, the written left-eye video is displayed in the upper half of the screen SC, and the written left-eye video is not displayed in the lower half.
During the period from the time point t3 to the time point t4, the right-eye video is written in the upper half of the display area of the liquid crystal panel 100, but the upper half of the liquid crystal panel 100WB is in a non-transparent state. Since half of the pixels are in the transmissive state, no video is displayed on the upper half of the screen SC, and the written left-eye video is displayed on the lower half.
In the period from the time point t4 to the time point t5, the right-eye video is written in the lower half of the display area of the liquid crystal panel 100, but the upper half of the liquid crystal panel 100WB is in a transmissive state and the lower half. Thus, the written right-eye image is displayed on the upper half of the screen SC, and the right-eye image being written is not displayed on the lower half.
In the period from the time point t5 to the time point t6, the left-eye video is written to the upper half of the display area of the liquid crystal panel 100, but the upper half of the liquid crystal panel 100WB is in a non-transparent state. Since half of the pixels are in a transmissive state, no video is displayed on the upper half of the screen SC, and a written right-eye video is displayed on the lower half.

  That is, when the video signal for the left eye and the video signal for the right eye are alternately supplied to the display device 10, the upper half of the image projected on the screen SC is black → left eye image → black. → Display for right eye → Black → Left eye → →. Further, the lower half of the image projected on the screen SC is repeated as follows: right eye image → black → left eye image → black → right eye image →.

  Next, the operation of the glasses 20 will be described. FIG. 7C is a diagram showing the opening / closing timings of the left-eye liquid crystal shutter and the right-eye liquid crystal shutter when time is taken on the horizontal axis. As shown in FIG. 7C, the left-eye liquid crystal shutter is opened from the time when writing of the upper half of the left-eye video ends (time t2, t6), and the upper half of the right-eye video. Is closed from the time (time t4) when the writing is completed. Further, as shown in FIG. 7C, the liquid crystal shutter for the right eye is opened from the time (time t4) when the writing of the upper half of the right-eye video is completed, and the upper half of the left-eye video. Is closed from the time (time t2, t6) when the writing is completed.

  Here, as shown in FIG. 7D, in the period from the time point t2 to the time point t4, the lower half is displayed on the screen SC next to the upper half of the left-eye video image. The right-eye video is not visually recognized while the liquid crystal shutter is open. Further, as shown in FIG. 7D, in the period from the time point t4 to the time point t6, the lower half is displayed next to the upper half of the right eye image on the screen SC. The left-eye video is not visually recognized while the liquid crystal shutter is open.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. FIG. 8 is a block diagram illustrating a configuration of the projection unit 17 of the display device 10 according to the second embodiment. As shown in this figure, the liquid crystal panel provided in the projection unit 17 according to the second embodiment is different from that in the first embodiment. The projection unit 17 according to the present embodiment does not include the liquid crystal panel 100WB but includes the liquid crystal panels 100RA, 100GA, and 100BA. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

The liquid crystal panel 100RA, the liquid crystal panel 100GA, and the liquid crystal panel 100BA are transmissive liquid crystal panels that modulate incident light, and include pixels arranged in a plurality of rows and a plurality of columns. The liquid crystal panel 100RA is disposed between the liquid crystal panel 100R and the mirror 1204. The liquid crystal panel 100GA is disposed between the liquid crystal panel 100G and the dichroic mirror 1203, and the liquid crystal panel 100BA is disposed between the liquid crystal panel 100B and the mirror 1206.
The plurality of pixels of the liquid crystal panel 100R and the plurality of pixels of the liquid crystal panel 100RA correspond to the respective positions. For example, light transmitted through the pixels 110 in the m rows and n columns of the liquid crystal panel 100RA is m in the liquid crystal panel 100R. The pixel in row n column is reached. Note that the positions of the plurality of pixels also correspond to each other in the pair of the liquid crystal panel 100B and the liquid crystal panel 100BA and the pair of the liquid crystal panel 100G and the liquid crystal panel 100GA.

A drive control circuit 200 is also provided for each of the liquid crystal panel 100RA, the liquid crystal panel 100GA, and the liquid crystal panel 100BA. Hereinafter, for convenience of explanation, a drive control circuit provided in each of the liquid crystal panel 100RA, the liquid crystal panel 100GA, and the liquid crystal panel 100BA is referred to as a drive control circuit 200A. Further, when it is not necessary to distinguish each of the liquid crystal panel 100RA, the liquid crystal panel 100GA, and the liquid crystal panel 100BA, they are referred to as a liquid crystal panel 100A.
A video signal representing a red video is supplied to the drive control circuit 200A corresponding to the liquid crystal panel 100RA. The drive control circuit 200A controls the liquid crystal panel 100RA according to a video signal representing a red video, and controls the transmittance of each pixel of the liquid crystal panel 100RA. In addition, a video signal representing a green video is supplied to the drive control circuit 200A corresponding to the liquid crystal panel 100GA. The drive control circuit 200A controls the liquid crystal panel 100GA according to a video signal representing a green video, and controls the transmittance of each pixel of the liquid crystal panel 100GA. Further, a video signal representing a blue video is supplied to the drive control circuit 200A corresponding to the liquid crystal panel 100BA. The drive control circuit 200A controls the liquid crystal panel 100BA according to a video signal representing a blue video, and controls the transmittance of each pixel of the liquid crystal panel 100BA.

  The drive control circuit 200A is different from the drive control circuit 200 in controlling the corresponding liquid crystal panel 100A. Specifically, the drive control circuit 200A sets a pair of odd-numbered scanning lines 112 and one even-numbered scanning line 112 adjacent to the scanning lines 112, and each set is selected in order. Thus, the scanning line driving circuit 130 related to the liquid crystal panel 100A is controlled. As a result, the scanning lines 112 are selected at the same time, such as the first and second lines, the third and fourth lines,..., The m−1th line and the mth line. That is, the scanning period of the liquid crystal panel 100 </ b> A is a half period of the liquid crystal panel 100.

Further, the drive control circuit 200A differs from the drive control circuit 200 in the video written to the liquid crystal panel 100A. Specifically, when a video signal is supplied, the drive control circuit 200A first controls the liquid crystal panel 100A so that two scanning lines are simultaneously selected, and the transmittance of all the pixels of the liquid crystal panel 100A is controlled. Minimize.
Next, when the drive control circuit 200A selects one set of scan lines, the drive control circuit 200A supplies a data signal Vx indicating the gray level of the pixels related to the scan lines in the odd-numbered rows of the set to the data line drive circuit 140. As described above, in the liquid crystal panel 100A, since one adjacent odd-numbered scanning line and one even-numbered scanning line are simultaneously selected, the same column among the pixels related to the selected scanning line. These pixels have the same transmittance. That is, the resolution of the video written on the liquid crystal panel 100A is half the resolution of the video written on the liquid crystal panel 100.

(Operation example of the second embodiment)
Next, an operation example when a stereoscopic image is observed with the display system 1 according to the second embodiment will be described. FIG. 9A shows scanning selected by the scanning signals G1 to Gm, where 1 to m rows of the scanning lines 112 of the liquid crystal panel 100 according to the second embodiment are taken on the vertical axis and time is taken on the horizontal axis. The time transition of the line is shown. First, the operation of the liquid crystal panel 100 is the same as that of the first embodiment. Therefore, as shown in FIG. 9A, the left-eye video and the right-eye video are alternately written on the liquid crystal panel 100.

Next, (b) of FIG. 9 shows the temporal transition of the scanning line selected when the vertical axis is 1 to m rows of the scanning line 112 of the liquid crystal panel 100A and the time is the horizontal axis. First, when the video signal of the left-eye video is supplied to the drive control circuit 200A, as described above, in the liquid crystal panel 100A, two scanning lines 112 are selected and the transmittance of all pixels is minimized. It becomes. The drive control circuit 200A writes the image for the left eye on the liquid crystal panel 100A after minimizing the transmittance of all the pixels. In the liquid crystal panel 100A, the same video as the video of the selected odd-numbered row is written in the pixels of the next even-numbered row after the selected odd-numbered row. Therefore, the resolution of the video written to the liquid crystal panel 100A is liquid crystal This is half the resolution of the left-eye video written on the panel 100.
Next, when the video signal of the right-eye video is supplied to the drive control circuit 200A, two scanning lines 112 are selected in the liquid crystal panel 100A, and the transmittance of all pixels is minimized. The drive control circuit 200A writes the image for the right eye on the liquid crystal panel 100A after minimizing the transmittance of all the pixels. Also in this case, since the same video as the video of the selected odd row is written in the pixels of the even row next to the selected odd row, the resolution of the video written to the liquid crystal panel 100A is written to the liquid crystal panel 100. Half the resolution of the right-eye video.

FIG. 9D shows a temporal transition of the image projected on the screen SC when the vertical direction of the image projected on the screen SC is taken on the vertical axis and the time is taken on the horizontal axis.
In the period from the time point t1 to the time point t2 when the video signal of the left-eye video is supplied to the drive control circuit 200 and the drive control circuit 200A, the transmittance of the liquid crystal panel 100A is sequentially minimized from the first row. At the time t2 when selection of all the scanning lines of the liquid crystal panel 100A is completed, the light from the light source 1201 does not reach the liquid crystal panel 100, and the screen SC is displayed as shown in FIG. Black display. In addition, during the period from time t2 to time t3, the left-eye video with half the resolution is written to the liquid crystal panel 100A. Here, since the image for the left eye is written in the liquid crystal panel 100 and the liquid crystal panel 100A, the image for the left eye is displayed on the screen SC at the time t3 when selection of all the scanning lines is completed.
Next, in the period from time t3 to time t4 when the video signal of the right-eye video is supplied to the drive control circuit 200 and the drive control circuit 200A, the transmittance of the liquid crystal panel 100A is sequentially minimized from the first row. Therefore, at the time t4 when the selection of all the scanning lines of the liquid crystal panel 100A is completed, the light from the light source 1201 does not reach the liquid crystal panel 100, and the screen SC as shown in FIG. Is displayed in black. In the period from time t4 to time t5, right-eye video with half the resolution is written to the liquid crystal panel 100A. Here, since the right-eye video is written in the liquid crystal panel 100 and the liquid crystal panel 100A, the right-eye video is displayed on the screen SC at the time t5 when selection of all the scanning lines is completed.
In the period from time t5 to time t6 when the video signal of the next left-eye video is supplied to the drive control circuit 200 and the drive control circuit 200A, the transmittance of the liquid crystal panel 100A is sequentially minimized from the first row. Then, at the time t6 when selection of all the scanning lines of the liquid crystal panel 100A is completed, the light from the light source 1201 does not reach the liquid crystal panel 100, and the screen SC is displayed as shown in FIG. Becomes black.

  As described above, when the left-eye video signal and the right-eye video signal are alternately supplied to the display device 10, the video projected on the screen SC is black → left-eye video → black → Repeatedly, right-eye video → black → left-eye video →.

  Next, the operation of the glasses 20 will be described. FIG. 9C is a diagram showing the opening / closing timings of the left-eye liquid crystal shutter and the right-eye liquid crystal shutter when time is taken on the horizontal axis. As shown in FIG. 9C, the liquid crystal shutter for the left eye is opened from the time (time t2, t6) when the writing of the video for the left eye is started in the liquid crystal panel 100A, and the right shutter in the liquid crystal panel 100A. It closes from the time (time t4) when the writing of the eye video starts. Further, as shown in FIG. 9C, the liquid crystal shutter for the right eye is opened from the time (right time t4) when the writing of the video for the right eye is started in the liquid crystal panel 100A, and left in the liquid crystal panel 100A. It closes from the time (time t2, t6) when the writing of the eye video starts.

  Here, as shown in FIG. 9D, in the period during which the left-eye video is displayed (the period from time t2 to time t4), the left-eye video is displayed on the screen SC. Therefore, the right-eye video is not visually recognized during the period when the left-eye liquid crystal shutter is open. Further, as shown in FIG. 9 (d), the right-eye video is displayed on the screen SC during the period in which the right-eye video is displayed (the period from time t4 to time t6). The left-eye video is not visually recognized during the period in which the right-eye liquid crystal shutter is open.

[Modification]
As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above, It can implement with another various form. For example, the present invention may be implemented by modifying the above-described embodiment as follows. In addition, you may combine each of embodiment mentioned above and the following modifications.

  In the embodiment described above, the left-eye video is written on the liquid crystal panel 100 in the first field, and the right-eye video is written on the liquid crystal panel 100 in the second field, but the right eye is written on the liquid crystal panel 100 in the first field. The video for the left eye may be written, and the video for the left eye may be written in the liquid crystal panel 100 in the second field. In this configuration, the shutter for the left eye is closed during the period from time t2 to time t4, while the shutter for the right eye is opened while the shutter for the left eye is open during the period from time t4 to time t6. While the shutter is opened, the right-eye shutter is closed.

In the first embodiment described above, the liquid crystal panel 100WB is disposed between the light source 1201 and the dichroic mirror 1202. However, the liquid crystal panel 100WB may be disposed between the dichroic prism 1207 and the projection lens 1208. . In the configuration in which the liquid crystal panel 100WB is disposed between the dichroic prism 1207 and the projection lens 1208, the liquid crystal is displayed in accordance with the luminance signal indicating the luminance of the right-eye image and the luminance signal indicating the luminance of the left-eye image. Panel 100WB may be driven.
Further, the liquid crystal panel 100WB may be disposed between the liquid crystal panel 100 and the dichroic prism 1207 instead of being disposed between the light source 1201 and the dichroic mirror 1202.
In addition, the liquid crystal panel 100WB is not disposed between the light source 1201 and the dichroic mirror 1202, but between the liquid crystal panel 100R and the mirror 1204, between the liquid crystal panel 100G and the dichroic mirror 1203, and between the liquid crystal panel 100B and the mirror 1206. You may make it arrange | position between.

In the first embodiment described above, in the period from the start of writing of the left-eye video (right-eye video) to the end in the liquid crystal panel 100 (the period from time t1 to time t2), the liquid crystal panel 100WB. Then, after selecting two scanning lines 112 to minimize the transmittance of all pixels, two scanning lines 112 may be selected to maximize the transmittance of all pixels.
In the second embodiment, in the period from the start of the writing of the left-eye video (right-eye video) to the end thereof, the liquid crystal panel 100A selects two scanning lines 112 at a time for all pixels. After minimizing the transmittance, two scanning lines 112 may be selected to maximize the transmittance of all the pixels.

  In the second embodiment described above, the odd-numbered video is written in the even-numbered row when the odd-numbered and even-numbered rows are selected in the liquid crystal panel 100A, but the even-numbered video may be written in the odd-numbered row. Good.

  In the above-described embodiment, the apparatus including the liquid crystal panels 100, 100A, and 100WB is a so-called projector. However, the apparatus that includes the liquid crystal panels 100, 100A, and 100WB and displays an image is not limited to the projector. . For example, in a direct-view device such as a liquid crystal television which is an example of an electronic device, a liquid crystal panel that forms an image is the liquid crystal panel 100, and the liquid crystal panel 100WB or the liquid crystal panel 100A is provided between the backlight and the liquid crystal panel that forms the image. The liquid crystal panel 100WB or the liquid crystal panel 100A may be disposed on the side opposite to the backlight when viewed from the liquid crystal panel forming the video.

  In the embodiment described above, the liquid crystal panels 100, 100A, and 100WB are transmissive liquid crystal panels, but are not limited to this configuration. FIG. 10 is a diagram illustrating a configuration of the projection unit 17 of the display device 10 according to the present modification. In the configuration of FIG. 10, the liquid crystal panels 100R, 100G, and 100B are reflective liquid crystal panels (first modulation unit), and the liquid crystal panels 100RA, 100GA, and 100BA are transmissive liquid crystal panels (second modulation). Part). The light source 1211 emits yellow light, and the light source 1212 emits light in the blue wavelength band. The dichroic mirror 1213 is a mirror that transmits light in the red wavelength band and reflects light in the green wavelength band. The half mirrors 1214 to 1216 are mirrors that transmit light incident from one surface and reflect light incident from the other surface.

The light in the blue wavelength band emitted from the light source 1212 passes through the half mirror 1216 and then enters the liquid crystal panel 100B. The light reflected by the liquid crystal panel 100B is reflected by the half mirror 1216 and enters the liquid crystal panel 100BA. Further, the light emitted from the light source 1212 enters the dichroic mirror 1213. Of the light incident on the dichroic mirror 1213, light in the red wavelength band is transmitted, and light in the green wavelength band is reflected and incident on the half mirror 1215. The light in the red wavelength band that has passed through the dichroic mirror 1213 passes through the half mirror 1214 and then enters the liquid crystal panel 100R. The light reflected by the liquid crystal panel 100R is reflected by the half mirror 1214 and enters the liquid crystal panel 100RA. Further, the light in the green wavelength band reflected by the dichroic mirror 1213 passes through the half mirror 1215 and then enters the liquid crystal panel 100G. The light reflected by the liquid crystal panel 100G is reflected by the half mirror 1215 and enters the liquid crystal panel 100GA.
In the configuration shown in FIG. 10, the positions of the liquid crystal panel 100 and the liquid crystal panel 100A are switched, the liquid crystal panel 100A is a reflective liquid crystal panel (second modulator), and the liquid crystal panel 100 is a transmissive liquid crystal. It is good also as a panel (1st modulation | alteration part).

In the above-described embodiment, the light is modulated by the liquid crystal panel 100 or the liquid crystal panel 100A. However, what modulates the light is not limited to the liquid crystal panel. For example, DMD (Digital Mirror Device) It is good. FIG. 11 is a diagram illustrating a configuration of the projection unit 17 that uses a DMD to modulate light.
The color wheel 1220 is a disk in which red, blue, and green filters are integrated. Light emitted from the light source 1201 passes through the rotating color wheel and becomes light in the red wavelength band, green wavelength band, or blue wavelength band. The light transmitted through the color wheel 1220 passes through the half mirror 1221 and reaches the digital mirror device DMD1. The light reflected by the digital mirror device DMD1 is reflected by the half mirror 1221, passes through the half mirror 1222, and reaches the digital mirror device DMD2. The light reflected by the digital mirror device DMD 1 is reflected by the half mirror 1222 and enters the projection lens 1208.

  In the configuration shown in FIG. 11, one of the digital mirror device DMD1 and the digital mirror device DMD2 operates in the same manner as the liquid crystal panel 100 (first modulation unit), and the other operates as the liquid crystal panel 100A (second modulation unit). With the same operation, the image projected on the screen SC can be the same image as that shown in FIG. 7D or FIG. 9D.

DESCRIPTION OF SYMBOLS 1 ... Display system, 10 ... Display apparatus, 12 ... Control part, 15 ... Communication part, 16 ... Image | video acquisition part, 17 ... Projection part, 100, 100A, 100R, 100G, 100B, 100RA, 100GA, 100BA, 100WB ... Liquid crystal Panel, 101 ... Display area, 105 ... Liquid crystal, 110 ... Pixel, 112 ... Scan line, 114 ... Data line, 120 ... Liquid crystal element, 130 ... Scan line drive circuit, 140 ... Data line drive circuit, 200, 200A, 200WB ... Drive control circuit, 1201... Light source, 1202, 1203... Dichroic mirror, 1204, 1205, 1206... Mirror, 1207. Half mirror, 1220 ... color ho Lumpur, 1221, 1222 ... half mirror, DMD1, DMD2 ... digital mirror device

Claims (7)

A first modulation unit that modulates the incident light and a second modulation unit that modulates the incident light, and the light modulated by the first modulation unit is modulated by the second modulation unit and emitted. A drive circuit for driving a device that modulates the light modulated by the second modulation unit with the first modulation unit and emits the light;
Of the first field and the second field that are alternately switched, one of the right-eye video and the left-eye video is formed in the first field by driving the first modulation unit line-sequentially, and the second field Forming the other image in the field by driving the first modulation unit line-sequentially;
The second modulation unit is driven so that the other video is not emitted in the second half of the first field and the first half of the second field, and the one of the second field and the first half of the first field The second modulation unit is driven so as not to emit the image of the driving circuit. In the first half of the first field and the first half of the second field,
The second modulation is performed so that an image formed in a portion that is not driven in the first half is emitted in the first modulation unit, and an image formed in a portion driven in the first half is not emitted in the first modulation unit. Drive part,
In the second half of the first field and the second half of the second field,
The second modulation is performed so that an image formed in a portion not driven in the second half is emitted in the first modulation unit, and an image formed in a portion driven in the second half is not emitted in the first modulation unit. The driving circuit according to claim 1, wherein the driving circuit is driven. In the first half of the first field and the first half of the second field, the second modulator is driven at a speed twice that of the first modulator so that light is not emitted from the second modulator.
In the second half of the first field and the second half of the second field, the second modulation unit is driven at a speed twice that of the first modulation unit so that light is emitted from the second modulation unit. Item 2. The drive circuit according to Item 1. In the second half of the first field, the second modulation unit is driven at a speed twice that of the first modulation unit in accordance with the one video, and in the second half of the second field, the other 4. The drive circuit according to claim 3, wherein the second modulation unit is driven at a speed twice that of the first modulation unit in accordance with the video image. A first modulation unit that modulates the incident light and a second modulation unit that modulates the incident light, and the light modulated by the first modulation unit is modulated by the second modulation unit and emitted. An apparatus for modulating and emitting the light modulated by the second modulation unit by the first modulation unit,
Of the first field and the second field that are alternately switched, one of the right-eye video and the left-eye video is formed in the first field by driving the first modulation unit line-sequentially, and the second field Forming the other image in the field by driving the first modulation unit line-sequentially;
The second modulation unit is driven so that the other video is not emitted in the second half of the first field and the first half of the second field, and the one of the second field and the first half of the first field The display device is characterized in that the second modulation unit is driven so that the image is not emitted.   An electronic apparatus having the display device according to claim 5. A first modulation unit that modulates the incident light and a second modulation unit that modulates the incident light, and the light modulated by the first modulation unit is modulated by the second modulation unit and emitted. A driving method for driving a device that modulates and emits light modulated by the second modulation unit by the first modulation unit,
Of the first field and the second field that are alternately switched, one of the right-eye video and the left-eye video is formed in the first field by driving the first modulation unit line-sequentially, and the second field Forming the other image in the field by driving the first modulation unit line-sequentially;
The second modulation unit is driven so that the other video is not emitted in the second half of the first field and the first half of the second field, and the one of the second field and the first half of the first field The second modulation unit is driven so that the image is not emitted. A driving method comprising:

Images