JP5805566B2 - Barrier liquid crystal device and stereoscopic image display device - Google Patents

Description

  The present invention relates to a parallax barrier type stereoscopic image display device capable of observing a stereoscopic image without using special glasses. In particular, the present invention relates to a stereoscopic image display apparatus that expands a range in which stereoscopic viewing is possible by moving the position of a parallax barrier.

  There are two methods for viewing a display image in three dimensions: a naked eye method and a method of wearing glasses. As a method for wearing glasses, a method using a head mounted display or polarized glasses has been put into practical use. However, it is inconvenient to wear glasses when viewing a display image of a portable device or the like. In this respect, the naked-eye method does not have such inconvenience and is suitable for a display device for mobile use.

  A parallax barrier method is known as a naked eye method. In the parallax barrier method, a barrier panel is installed on the front surface or the back surface of the display panel. In the display panel, vertical lines for displaying the left image and vertical lines for displaying the right image are alternately arranged. The barrier panel is a vertical stripe shading mask in which transparent portions and opaque portions are alternately arranged at a barrier pitch. This barrier pitch is substantially equal to the pitch of the vertical lines of the display pixels. When the observer observes the display panel through the barrier panel, for example, the odd-numbered vertical lines of the display panel can be seen with the right eye, but the even-numbered vertical lines are shielded by the barrier panel and cannot be seen. On the other hand, the left eye can see even-numbered vertical lines on the display panel, but the odd-numbered vertical lines are blocked by the barrier panel and cannot be seen. The left image for the left eye and the right image for the right eye are displayed on the vertical line of the display panel for each line, so that the observer can simultaneously see the left and right images from one display panel with the naked eye. Can be recognized as a stereoscopic image.

  However, in the parallax barrier method, the observation positions that can be viewed as a stereoscopic image are limited. Therefore, it is known that the barrier electrode is composed of a bundle of six divided electrodes, the divided electrodes are switched on / off, and the light blocking barrier is moved laterally according to the position of the observer to widen the stereoscopically visible region. (For example, see Patent Document 1). According to such a configuration, the position of the light shielding barrier is variable, and stereoscopic viewing is possible even when the viewpoint of the observer is shifted laterally.

JP 2011-18049 A

  However, in Patent Document 1, since ON / OFF of the divided electrodes that form the light shielding barrier is simultaneously controlled by the output of the sensor, the temporal change of the light shielding barrier derived from the response speed characteristics of the liquid crystal is not considered. In general, in the TN liquid crystal used in the normally white mode, the change in transmittance of the liquid crystal is faster than on than off. Therefore, the time (Ton) until the transmittance changes from 90% to 10% is shorter than the time (Toff) until the transmittance changes from 10% to 90%. Also, the reaction from when the driving voltage is applied until the transmittance change starts to occur is faster than on. Therefore, when simultaneously controlling the split electrode that is turned from off to on and the split electrode that is turned from on to off, the light shielding barrier on the split electrode that is turned from off to on is turned off from on due to the difference in the response speed and reaction time of the liquid crystal. Appears before the light-shielding barrier on the split electrode disappears. Therefore, a light-shielding barrier temporarily exists on the two divided electrodes, and the transmittance is lowered. Thereafter, the light shielding barrier on the divided electrode to be turned off is gradually disappeared, and the transmittance of the barrier panel is restored. This change in transmittance will be described with reference to FIG. FIG. 12B is an on / off transmittance curve (broken line) on the divided electrode that switches from the on state to the off state and an off / on transmittance curve (solid line) on the divided electrode that switches from the off state to the on state. . The brightness of the barrier panel is determined by the transmittance of the barrier panel and the brightness of light incident on the barrier panel. The transmittance of the barrier panel when switching on and off is the on / off transmittance curve and the off / on transmittance curve shown in FIG. 12B, the transmittance on the on-divided electrode, and the transmittance on the off-divided electrode. And it is determined by the transmittance of parts other than the divided electrodes. When the transmittance change shown in FIG. 12B occurs due to the on / off switching, the brightness curve of the barrier panel is shown in FIG. A transmittance variation occurs at a change point at the time of on / off switching, and the transmittance variation appears as a luminance variation 30. When a liquid crystal having a high response speed is used, the rise of the on / off transmittance curve and the fall of the off / on transmittance curve are steeper, but the luminance fluctuation is not lost.

  FIG. 13 shows waveforms applied to the barrier panel when switching from on to off and switching from off to on at the same time. FIG. 13A shows the common electrode waveform supplied to the common electrode, FIG. 13B shows the ON / OFF electrode waveform supplied to the divided electrode A that is switched from the ON state to the OFF state, and FIG. FIG. 13 (d) shows an off / on electrode waveform supplied to the divided electrode B that is switched from the off state to the on state, and FIG. 13 (d) shows an on electrode waveform supplied to the divided electrode C that maintains the on state. ) Shows an off-electrode waveform supplied to the divided electrode D that maintains the off-state. Here, the timing at which the on / off electrode waveform switches from on to off and the timing at which the off / on electrode waveform switches from off to on are the same. The transmittance on the divided electrode A to which the on / off electrode waveform is applied corresponds to the on / off transmittance curve in FIG. 12B, and the transmittance on the divided electrode B to which the off / on electrode waveform is applied. Corresponds to the off-on transmittance curve of FIG. In other words, the brightness fluctuation 30 shown in FIG. 12A occurs in the barrier panel to which the waveform as shown in FIG. 13 is applied which is switched on and off at the same time. When the luminance variation 30 occurs, the observer feels uncomfortable with the stereoscopic video viewed.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a barrier liquid crystal device with less luminance fluctuation when switching on and off.

  The barrier liquid crystal device of the present invention includes a barrier panel that generates a dividing barrier having a transmission portion and a light shielding portion arranged in a vertical stripe by a barrier generation means. The division barriers arranged in the vertical stripe control the positions of the transmission part and the light shielding part, and the left and right images respectively reach the left and right eyes of the observer. The transmission part and the light shielding part are controlled in synchronization with the position information of the observer and the acceleration and angular velocity of the stereoscopic image display device. The divided barrier is displayed by a barrier liquid crystal panel that exhibits characteristics in which response speeds Ton and Toff are each between 1 ms and 20 ms. The input waveform supplied to the barrier panel sets a time difference of 1 ms to 20 ms between the input signal of the electrode that switches from the on state to the off state and the input signal of the electrode that switches from the off state to the on state. That is, the time difference at which the transmittance change starts to occur after the signal is input is adjusted.

  According to such a configuration, the luminance variation is small, and the observer is difficult to recognize as flicker. Therefore, a comfortable stereoscopic image can be observed even when the division barrier is moved.

  A stereoscopic image display device according to the present invention includes a barrier liquid crystal device having any one of the above-described configurations, a position detection circuit that calculates a correlation position between an observer's head and a barrier panel included in the barrier liquid crystal device, A display panel in which line-shaped pixels for displaying an image of the image and line-shaped pixels for displaying an image for the right eye are alternately arranged, display data for the left eye, and display data for the right eye are generated and displayed. A display panel driving circuit to be supplied to the panel and a stereoscopic video selection circuit for outputting a signal for instructing display of a stereoscopic image to the display panel driving circuit and a barrier panel control circuit included in the barrier liquid crystal device are provided.

  A stereoscopic image display apparatus that can reduce the luminance fluctuation of the barrier panel that occurs when moving the divided barrier and can observe a comfortable stereoscopic image is realized.

It is a schematic diagram which shows the main structures of a stereo image display apparatus. It is a fragmentary sectional view of a barrier panel. It is a fragmentary sectional view of a barrier panel. 3 is a plan view schematically showing a pattern shape of a barrier electrode used in Example 1. FIG. 3 is a partial cross-sectional view illustrating a barrier electrode used in Example 1. FIG. It is a figure explaining the display state of a barrier panel. 6 is a chart showing driving waveforms of a barrier panel according to Example 1. It is a figure showing the brightness | luminance variation and transmittance | permeability change of the barrier panel by Example 1. FIG. 10 is a chart showing driving waveforms of a barrier panel according to Example 2. It is a figure showing the brightness | luminance fluctuation | variation and transmittance | permeability change of the barrier panel by Example 2. FIG. 12 is a chart showing driving waveforms of a barrier panel according to Example 3. It is a figure which shows the luminance fluctuation and transmittance | permeability change of the conventional barrier panel. It is a chart which shows the drive waveform of the conventional barrier panel.

  The barrier liquid crystal device of the present invention includes a barrier panel and a barrier control circuit that drives the barrier panel, and includes a line-like pixel that displays an image for the left eye and a line-like pixel that displays an image for the right eye. Is used in a display device for observing a stereoscopic image in combination with a display panel in which are alternately arranged. The barrier panel has a configuration in which liquid crystal is sandwiched between a transparent substrate on which a stripe-shaped barrier electrode is formed and a counter substrate on which a common electrode is formed. The barrier electrode is formed of a plurality of divided electrodes. The barrier control circuit supplies a rectangular wave as a common electrode waveform to the common electrode. Also, among the plurality of divided electrodes, a rectangular wave having a phase opposite to that of the common electrode waveform is supplied as an ON waveform to the divided electrode in the ON state, and a rectangular wave having the same phase as the common electrode waveform is supplied to the OFF divided electrode as an off waveform. Supply as. Furthermore, the waveform supplied to the divided electrodes that change from the on state to the off state is a signal waveform that switches from the on waveform to the off waveform at time T. At this time, the waveform supplied to the divided electrode that changes from the off state to the on state is a signal waveform that is switched from the off waveform to the on waveform with a delay of 1 ms to 20 ms from the time T. By using such a waveform, it is possible to adjust the time difference at which the transmittance change starts to occur after the signal is input, and the brightness of the barrier panel due to the liquid crystal transmittance change being turned on earlier than off. Variation can be reduced. At this time, a barrier panel having a response speed of 1 ms to 20 ms may be used.

  Further, the off waveform applied to the divided electrode that changes from the on state to the off state is a waveform that reverses the polarity with a time difference of 1 ms to 20 ms from the polarity reversal of the common electrode waveform. The off waveform applied to the divided electrodes adjacent to each other is a waveform whose polarity is inverted with a time difference of 1 ms to 20 ms from the polarity inversion of the common electrode waveform. By using such a waveform, not only luminance fluctuation when the barrier display position is moved, but also minute luminance fluctuation appears when the barrier display position is not moved. For this reason, the time when the luminance fluctuation occurs is a short-time change with a human critical fusion frequency of 50 Hz or more. Therefore, it is difficult for the observer to recognize the luminance fluctuation as flicker, and a comfortable stereoscopic image can be observed.

  Alternatively, an off waveform applied to a divided electrode that is not adjacent to the divided electrode in the on state among the divided electrodes in the off state may be a waveform whose polarity is reversed with a time difference of 1 ms to 20 ms from the polarity reversal of the common electrode waveform. Also in this case, not only the luminance fluctuation when the barrier display position is moved, but also the minute luminance fluctuation appears when the barrier display position is not moved. For this reason, the time when the luminance fluctuation occurs is a short-time change with a human critical fusion frequency of 50 Hz or more. Therefore, it is difficult for the observer to recognize the luminance fluctuation as flicker, and a comfortable stereoscopic image can be observed.

  Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. In the following embodiments, an example in which the barrier electrode is composed of six divided electrodes and three adjacent divided electrodes are collectively turned on / off will be described, but the present invention can be similarly applied to other division numbers and display numbers.

(Example 1)
A stereoscopic image display apparatus according to the present embodiment will be described with reference to the drawings. FIG. 1 is a schematic diagram illustrating a schematic configuration of a stereoscopic image display apparatus. The stereoscopic image display device includes a sensor 2, a position detection circuit 3, a barrier display device 1, a stereoscopic video selection circuit 6, a display panel drive circuit 7, and a display panel 8. The barrier display device 1 includes a barrier panel control circuit 4 and a barrier panel 5. The sensor 2 is a camera that captures the face of the observer, an acceleration sensor that detects the level of the stereoscopic image device, and a gyroscope that detects the angular velocity. The position detection circuit 3 calculates the position of the observer with respect to the barrier display device 1 based on the signal output from the sensor 2 and determines the driving state of the barrier panel 5. The barrier panel control circuit 4 generates a barrier panel drive signal based on signals from the position detection circuit 3 and the stereoscopic image selection circuit 6 and drives the barrier panel 5. When the observer selects to view a stereoscopic image or when an image to be displayed on the display panel 8 is a stereoscopic image, the stereoscopic image selection circuit 6 sends a signal instructing to display the stereoscopic image to the barrier panel control circuit 4. To the display panel drive circuit 7. The display panel drive circuit 7 generates display data for the left eye and display data for the right eye based on the signal from the stereoscopic video selection circuit 6 and supplies the display data to the display panel 8. In the display panel 8, a pixel column that displays an image for the left eye and a pixel column that displays an image for the right eye are alternately arranged. The barrier panel 5 is disposed on the display surface side or the back surface side of the display panel 8. In this example, the response speed Ton (time until the transmittance changes from 90% to 10%) and Toff (time until the transmittance changes from 10% to 90%) each have a characteristic of 1 ms to 20 ms. A panel is used. The observer recognizes a stereoscopic image by the parallax barrier method when observing an image in which the left-eye pixel row and the right-eye pixel row are alternately arranged with the barrier displayed on the barrier panel 5. can do.

  The cross-sectional configuration of the barrier panel 5 is illustrated in FIGS. As shown, the liquid crystal 21 is sandwiched between a lower glass substrate 25 on which the common electrode 20 is formed and an upper glass substrate 24 on which the barrier electrode 10 is formed. The barrier electrode 10 is composed of a plurality of divided electrodes, and the position of the light shielding barrier can be arbitrarily changed by individually driving these divided electrodes to control on / off. In this embodiment, the barrier electrode 10 is divided into six. These are represented as first divided electrode 11 to sixth divided electrode 16. The first to sixth divided electrodes 11 to 16 are arranged at positions facing the common electrode 20. The first to sixth divided electrodes 11 to 16 constitute the barrier electrode 10 with six as one unit, and are repeatedly arranged in the horizontal direction. Here, six divided electrodes are used as one unit, but any number of divided electrodes may be used as long as it is two or more.

  In the barrier panel 5 shown in FIG. 2, a spherical spacer 22 is provided between the upper glass substrate 24 and the lower glass substrate 25 in order to make the thickness of the liquid crystal uniform. On the other hand, in the barrier panel 5 shown in FIG. 3, a columnar spacer 23 is provided between the upper glass substrate 24 and the lower glass substrate 25 in order to make the thickness of the liquid crystal uniform. The columnar spacer 23 is formed of resin or the like on at least one of the upper glass substrate 24 and the lower glass substrate 25.

  Next, the pattern shape of the barrier electrode 10 is shown in FIG. FIG. 4 is a plan view schematically showing the divided electrode group. The first divided electrodes 11 of all the barrier electrodes 10 are connected to the first barrier wiring 11L through the through holes TH. Therefore, the same waveform is applied to all the first barrier electrodes 11. The same applies to the other divided electrodes, and the second divided electrode 12 to the sixth divided electrode 16 are connected to the second barrier wiring 11L to the sixth barrier wiring 16L through the through holes TH. A driving waveform is supplied from the first barrier electrode 11L to the sixth divided electrode 16 from the first barrier electrode 11L via the sixth barrier wire 16L. A driving voltage is applied between the first to sixth divided electrodes 11 to 16 and the common electrode 20, and the liquid crystal 21 is driven to display the barrier. FIG. 5 is a sectional view taken along line AB in FIG. On the upper glass substrate 24, the 1st-6th barrier wiring 11L-16L, the insulating layer 26, and the 1st-6th divisional electrodes 11-16 are laminated | stacked in order. A through hole TH is formed on each barrier wiring, and the corresponding divided electrode and the barrier wiring are electrically connected. In the cross section shown in FIG. 5, a first barrier wiring 11L, a second barrier wiring 12L, and a third barrier wiring 13L are formed on the upper glass substrate 24, and an insulating layer 26 is provided so as to cover these barrier wirings. The first barrier wiring 11L and the first divided electrode 11 on the insulating film 26 are electrically connected by a through hole TH provided on the first barrier wiring 11L.

  FIG. 6 is a plan view showing a part of the barrier part and the transmissive part when the barrier panel 5 is driven. Divided electrodes indicated by diagonal lines shield light, and divided electrodes not indicated by diagonal lines transmit light. Here, on the display panel 8, a pixel column for displaying an image for the left eye and a pixel column for displaying an image for the right eye are alternately arranged. The width of the six divided electrodes corresponds to two columns of a pixel column for the left eye and a pixel column for the right eye. For example, the total width of the first divided electrode 11 to the third divided electrode 13 corresponds to the width of the pixel array for the left eye, and the total width of the fourth divided electrode 14 to the sixth divided electrode 16 is the pixel array for the right eye. Corresponds to the width of. When the barrier panel 5 is in the normally white mode, a voltage is applied between the light-shielded divided electrode and the common electrode, which is in the on state, and no voltage is applied between the light-shielded divided electrode and the common electrode. State. In the state of FIG. 6A, the first to third divided electrodes 11 to 13 are in an on state, and a drive voltage is applied between the common electrode 20. The fourth to sixth divided electrodes 14 to 16 are in an off state. When the state of FIG. 6A changes to the state of FIG. 6B, the first divided electrode 11 is switched from the on state to the off state, and the fourth divided electrode 14 is switched from the off state to the on state. When the state of FIG. 6B is changed to the state of FIG. 6C, the second barrier electrode 12 is switched from the on state to the off state, and the fifth divided electrode 15 is switched from the off state to the on state. By switching each divided electrode between the on state and the off state in this manner, the position of the transmitting electrode can be moved sideways. In the parallax barrier type stereoscopic video device, the viewer sees the stereoscopic video even when the positional relationship between the viewer and the stereoscopic image display device fluctuates by setting the transmission position of the barrier panel to face the viewer's eyes. be able to.

  FIG. 7 schematically shows waveforms supplied to each divided electrode and the common electrode. FIG. 7A shows a common electrode waveform supplied to the common electrode 20. As shown, the common electrode waveform is a rectangular wave. FIG. 7B shows the ON / OFF electrode waveform supplied to the divided electrode that is switched from the ON state to the OFF state. FIG. 7C shows the OFF / ON electrode that is supplied to the divided electrode that is switched from the OFF state to the ON state. An electrode waveform is shown. FIG. 7D shows an on-electrode waveform supplied to the divided electrode that maintains the on state, and FIG. 7E shows an off-electrode waveform supplied to the divided electrode that maintains the off state. Here, in the off / on electrode waveform, the timing for switching from the off state to the on state is delayed by a time difference Td1 from the timing T for switching the on / off electrode waveform from the on state to the off state.

  This will be specifically described with reference to FIG. It is assumed that switching from the barrier display state of FIG. 6A to the barrier display state of FIG. That is, the first divided electrode 11 is switched from the on state to the off state, and the fourth divided electrode 14 is switched from the off state to the on state. Therefore, the on / off electrode waveform shown in FIG. 7B is applied to the first divided electrode 11, and the off / on electrode waveform shown in FIG. 7C is applied to the fourth divided electrode 14. . The on-electrode waveform shown in FIG. 7 (d) is applied to the second divided electrode 12 and the third divided electrode 13, and the off-electrode waveform shown in FIG. 7 (e) is applied to the fifth divided electrode 15 and the sixth divided electrode 16. Supplied in. As described above, the time for the off / on electrode waveform to switch from the off state to the on state is delayed by the time difference Td1 from the time for the on / off electrode waveform to switch from the on state to the off state. The on / off electrode waveform is switched at a timing earlier than that of the off / on electrode waveform. The time difference Td1 is set between 1 ms and 20 ms.

  By supplying such a waveform, the conventional luminance fluctuation shown in FIG. FIG. 8 shows the luminance fluctuation and transmittance change of the barrier panel according to this embodiment. FIG. 8A is a graph showing the brightness of the barrier panel. When the transmission position of the barrier panel is moved, the brightness fluctuation 30 appears. Since it is corrected by the input waveform shown in FIG. FIG. 8B shows an on / off transmittance curve on the divided barrier electrode switched from the on state to the off state and an off / on transmittance curve on the divided barrier electrode switched from the off state to the on state. The observer can recognize a comfortable three-dimensional image without recognizing luminance fluctuations at the time of switching. Here, in order to correct the change of the luminance fluctuation 30 according to the temperature change of the use environment, the time difference Td1 may be changed according to the environment temperature.

(Example 2)
A stereoscopic image display apparatus according to the present embodiment will be described with reference to the drawings. The present embodiment is different from the first embodiment in the waveform applied to the divided electrode that switches from the on state to the off state and the divided electrode that switches from the off state to the on state in the off state. Since the other configuration is basically the same as that of the first embodiment, a duplicate description is omitted as appropriate.

  FIG. 9 schematically shows waveforms according to this embodiment supplied to each divided electrode and the common electrode. A common electrode waveform supplied to the common electrode 20 is shown in FIG. As shown, the common electrode waveform is a rectangular wave. FIG. 9B shows an on / off electrode waveform supplied to the divided electrode that is switched from the on state to the off state. When the on / off electrode waveform is switched from the off state to the on state at timing T, the off waveform is supplied. The off waveform supplied here is inverted in polarity with the time difference Td2 from the polarity inversion of the common electrode waveform. Although the polarity inversion is delayed in this figure, if there is a time difference from the common electrode waveform, the voltage is applied to the liquid crystal at that stage, so the polarity may be inverted earlier by the time difference Td2. FIG. 9C shows an off-on electrode waveform supplied to the divided electrode that is switched from the off state to the on state. In the off / on electrode waveform, the off waveform supplied in the off state is inverted in polarity with respect to the polarity inversion of the common electrode waveform and the time difference Td2. Although the polarity inversion is delayed in this figure, if there is a time difference from the common electrode waveform, the voltage is applied to the liquid crystal at that stage, so the polarity may be inverted earlier by the time difference Td2. Further, the timing of switching from the off state to the on state is delayed by a time difference Td1 from the timing T at which the on / off electrode waveform switches from the on state to the off state. FIG. 9D shows an ON electrode waveform supplied to the divided electrode that maintains the ON state, and FIG. 9E shows an OFF electrode waveform supplied to the divided electrode that maintains the OFF state.

  This will be specifically described with reference to FIG. It is assumed that switching from the barrier display state of FIG. 6A to the barrier display state of FIG. That is, the first divided electrode 11 is switched from the on state to the off state, and the fourth divided electrode 14 is switched from the off state to the on state. Therefore, the on / off electrode waveform shown in FIG. 9B is applied to the first divided electrode 11. That is, in the barrier display state of FIG. 6B, an off waveform that reverses the polarity of the common electrode waveform and the time difference Td2 is supplied. Further, the OFF / ON electrode waveform shown in FIG. 9C is applied to the fourth divided electrode 14. In the barrier display state of FIG. 6 (a), an off waveform that reverses the polarity of the common electrode waveform and the time difference Td2 is supplied. That is, in the barrier display state of FIG. 6A, an off waveform whose polarity is inverted with respect to the polarity inversion of the common electrode waveform and the time difference Td2 is supplied to the divided electrode adjacent to the on-state divided electrode among the divided electrodes in the off state. Is done. Specifically, the fourth divided electrode 14 and the sixth divided electrode 16 are supplied with a polarity reversal of the common electrode waveform and an off waveform whose polarity is reversed with an arbitrary time difference between 1 ms and 20 ms. On the other hand, the fifth divided electrode 15 is supplied with a rectangular wave in phase with the common electrode waveform as an off waveform. That is, the fifth electrode 15 is supplied with the off-electrode waveform shown in FIG. The second divided electrode 12 and the third divided electrode 13 are supplied with a rectangular wave having a phase opposite to that of the common electrode waveform shown in FIG. Thereafter, when the state shifts to the barrier display state of FIG. 6B, the waveform changes as follows. Since the fifth divided electrode 15 is an off-state electrode adjacent to the divided electrode in the on state (here, the fourth divided electrode 14), the polarity of the common electrode waveform is reversed and the off-electrode waveform whose polarity is reversed with the time difference Td2 is generated. Will be supplied. On the other hand, since the sixth divided electrode 16 is changed to an off-state electrode not adjacent to the on-state divided electrode, a rectangular wave having a phase opposite to that of the common electrode waveform is supplied as the off-electrode waveform. That is, the time difference Td2 is not set for the waveform applied to the sixth divided electrode 16.

  Thus, the waveform applied to each divided electrode is determined according to the change in the barrier display position. Further, the time differences Td1 and Td2 may be individually changed according to the temperature change of the use environment.

  By supplying such a waveform, the conventional luminance fluctuation shown in FIG. 12A is alleviated, resulting in the luminance fluctuation and transmittance change of the barrier panel as shown in FIG. FIG. 10A is a chart showing the brightness of the barrier panel, and FIG. 10B is an on / off transmittance curve on the divided electrode that is switched from the on state to the off state, and switching from the off state to the on state. It is a chart which shows the off-on transmittance | permeability curve on the divided electrode. As shown in the figure, a luminance variation 30 appears when the barrier display position is moved, and a luminance variation 31 appears when the barrier display position is not moved. This minute luminance variation is caused by the polarity inversion of the common electrode waveform shown in FIGS. 9B and 9C and the off waveform in which the polarity is inverted with the time difference Td2. The minute luminance fluctuation 31 has an effect of making the luminance fluctuation 30 inconspicuous, and the observer hardly recognizes the luminance fluctuation 30 at the time of switching.

  By devising the drive waveform as in the present embodiment, it is possible to make the observer more difficult to recognize the luminance fluctuation. Therefore, a comfortable stereoscopic image can be seen.

(Example 3)
A stereoscopic image display apparatus according to the present embodiment will be described with reference to the drawings. The present embodiment is different from the first embodiment in the waveform applied to the divided electrodes in which the OFF state continues. Since the other configuration is basically the same as that of the first embodiment, a duplicate description is omitted as appropriate.

  FIG. 11 schematically shows waveforms according to this embodiment supplied to each divided electrode and common electrode. The waveforms shown in FIGS. 11A to 11D are the same as those in the first embodiment. FIG. 11A shows the common electrode waveform supplied to the common electrode 20, FIG. 11B shows the ON / OFF electrode waveform supplied to the divided electrode that is switched from the ON state to the OFF state, and FIG. FIG. 11 (d) shows an on-electrode waveform supplied to the divided electrode that maintains the on-state, and FIG. 11 (d) shows an off-on-electrode waveform supplied to the divided electrode that is switched from the off-state to the on-state. FIG. 11E shows an off-electrode waveform supplied to the divided electrode that maintains the off-state. The off-electrode waveform supplied here is inverted in polarity with a time difference Td2 from the polarity inversion of the common electrode waveform. Although the polarity inversion is delayed in this figure, if there is a time difference from the common electrode waveform, the voltage is applied to the liquid crystal at that stage, so the polarity may be inverted earlier by the time difference Td2. FIG. 11C shows an off / on electrode waveform supplied to the divided electrode that is switched from the off state to the on state. The timing of switching from the off state to the on state is delayed by a time difference Td1 from the timing T at which the on / off electrode waveform switches from the on state to the off state.

  This will be specifically described with reference to FIG. It is assumed that switching from the barrier display state of FIG. 6A to the barrier display state of FIG. That is, the first divided electrode 11 is switched from the on state to the off state, and the fourth divided electrode 14 is switched from the off state to the on state. Therefore, the on / off electrode waveform shown in FIG. 11B is applied to the first divided electrode 11. In the barrier display state shown in FIG. 6A, a rectangular wave having a phase opposite to that of the common electrode waveform is supplied to the first divided electrode 11 as an ON waveform. In the barrier display state shown in FIG. 6B, a rectangular wave having the same phase as the common electrode waveform is supplied to the first divided electrode 11 as an off waveform. Then, the OFF / ON electrode waveform shown in FIG. 11C is applied to the fourth divided electrode 14. In the barrier display state shown in FIG. 6A, a rectangular wave having the same phase as the common electrode waveform is supplied to the fourth divided electrode 14 as an off waveform. The time for the off / on electrode waveform to switch from the off state to the on state is delayed by a time difference Td1 from the time for the on / off electrode waveform to switch from the on state to the off state. Therefore, in the barrier display state shown in FIG. 6B, an OFF waveform is continuously supplied to the fourth divided electrode 14 at a time difference Td1 from the timing T, and then a rectangular wave (ON) that is in reverse phase to the common electrode waveform. Waveform). Further, the second divided electrode 12 and the third divided electrode 13 are supplied with a rectangular wave having a phase opposite to that of the common electrode waveform shown in FIG.

  Next, the waveform supplied to the fifth divided electrode 15 will be described. In the barrier display state shown in FIG. 6A, the fifth divided electrode 15 is an electrode in the off state that is not adjacent to the divided electrode in the on state. Therefore, the fifth divided electrode 15 is supplied with an off waveform that reverses the polarity of the common electrode waveform with the time difference Td2. Thereafter, when the state shifts to the barrier display state of FIG. 6B, the waveform changes as follows. Since the fifth divided electrode 15 is an off-state electrode adjacent to the divided electrode in the on state (here, the fourth divided electrode 14), the fifth divided electrode 15 is supplied with an off-waveform in phase with the common electrode waveform. Will be. That is, the time difference Td2 is not set in the off waveform applied to the fifth divided electrode 15 in the barrier display state of FIG.

  Next, the waveform supplied to the sixth divided electrode 16 will be described. In the barrier display state shown in FIG. 6A, the sixth divided electrode 16 is an off-state electrode adjacent to the on-state divided electrode (here, the first divided electrode 11). For this reason, the sixth divided electrode 16 is supplied with an off waveform in phase with the common electrode waveform. Thereafter, when the state shifts to the barrier display state of FIG. 6B, the waveform changes as follows. Since the sixth divided electrode 16 has changed to an off-state electrode that is not adjacent to the divided electrode in the on-state, the sixth divided electrode 16 is supplied with an off-waveform that reverses the polarity of the common electrode waveform and the time difference Td2. Will be.

  Thus, the waveform applied to each divided electrode is determined according to the change in the barrier display position. Further, the time differences Td1 and Td2 may be individually changed according to the temperature change of the use environment. Here, the time difference Td1 is set to a time between 1 ms and 20 ms. The time difference Td2 may also be set individually at an arbitrary time between 1 ms and 20 ms.

  By supplying such a waveform, the conventional luminance fluctuation shown in FIG. 12A is alleviated, resulting in the luminance fluctuation and transmittance change of the barrier panel as shown in FIG. FIG. 10A is a chart showing the brightness of the barrier panel, and FIG. 10B is an on / off transmittance curve on the divided electrode that is switched from the on state to the off state, and switching from the off state to the on state. It is a chart which shows the off-on transmittance | permeability curve on the divided electrode. As shown in the figure, a luminance variation 30 appears when the barrier display position is moved, and a luminance variation 31 appears when the barrier display position is not moved. The minute luminance fluctuation is caused by the polarity inversion of the common electrode waveform illustrated in FIG. 11E and the off waveform in which the polarity is inverted with the time difference Td2. That is, this time difference Td2 constantly changes the transmittance, and causes a slight luminance fluctuation. The minute luminance fluctuation 31 has an effect of making the luminance fluctuation 30 inconspicuous, and the observer hardly recognizes the luminance fluctuation 30 at the time of switching.

  According to the drive waveform of the present embodiment, it becomes more difficult for the observer to recognize the luminance variation, and a comfortable stereoscopic image can be seen.

DESCRIPTION OF SYMBOLS 1 Barrier liquid crystal device 2 Sensor 3 Position detection circuit 4 Barrier panel control circuit 5 Barrier panel 6 Stereo image selection circuit 7 Display panel drive circuit 8 Display panel 10 Barrier electrode 11 1st division electrode 12 2nd division electrode 13 3rd division electrode 14 Fourth divided electrode 15 Fifth divided electrode 16 Sixth divided electrode 11L First barrier wiring 12L Second barrier wiring 13L Third barrier wiring 14L Fourth barrier wiring 15L Fifth barrier wiring 16L Sixth barrier wiring 20 Common electrode 21 Liquid crystal 22 Spherical spacer 23 Columnar spacer 24 Upper glass substrate 25 Lower glass substrate 30 Luminance variation 31 Luminance variation TH Through hole Td1 Time difference Td2 Time difference

Claims (5)

A barrier panel in which liquid crystal is sandwiched between a transparent substrate on which a stripe-shaped barrier electrode is formed and a counter substrate on which a common electrode is formed;
In a barrier liquid crystal device comprising a barrier control circuit for driving the barrier panel,
The barrier electrode is formed of a plurality of divided electrodes,
The barrier control circuit supplies a rectangular wave as a common electrode waveform to the common electrode, and supplies a rectangular wave having a phase opposite to that of the common electrode waveform as an ON waveform to an ON-state divided electrode among the plurality of divided electrodes. In addition, the off-state divided electrode is supplied with a rectangular wave in phase with the common electrode waveform as an off waveform,
When the waveform supplied to the split electrode that changes from the on state to the off state switches from the on waveform to the off waveform at time T, the waveform that is supplied to the split electrode that changes from the off state to the on state is A barrier liquid crystal device, which is switched from the off waveform to the on waveform with a delay of 1 ms to 20 ms from T. The off waveform applied to the divided electrodes that change from the on state to the off state is inverted in polarity with a time difference of 1 ms to 20 ms from the polarity inversion of the common electrode waveform,
The off waveform applied to a divided electrode adjacent to the divided electrode in the on state among the divided electrodes in the off state is inverted in polarity with a time difference of 1 ms to 20 ms from a polarity reversal of the common electrode waveform. Item 2. The barrier liquid crystal device according to Item 1.   The off waveform applied to a divided electrode not adjacent to the divided electrode in the on state among the divided electrodes in the off state is inverted in polarity with a time difference of 1 ms to 20 ms from the polarity reversal of the common electrode waveform. Item 2. The barrier liquid crystal device according to Item 1.   The barrier liquid crystal device according to claim 1, wherein a response speed of the barrier panel exhibits a characteristic of 1 ms to 20 ms. A barrier liquid crystal device according to any one of claims 1 to 4;
A position detection circuit for calculating a correlation position between an observer's head and a barrier panel included in the barrier liquid crystal device;
A display panel in which line-shaped pixels for displaying an image for the left eye and line-shaped pixels for displaying an image for the right eye are alternately arranged;
A display panel driving circuit that generates display data for the left eye and display data for the right eye, and supplies the display data to the display panel;
A stereoscopic image display device, comprising: a stereoscopic image selection circuit that outputs a signal instructing display of a stereoscopic image to the display panel drive circuit and a barrier panel control circuit included in the barrier liquid crystal device.

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