JP2013117554A - Electro-optic device and electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve luminosity of a displayed image while suppressing a mixture of a right-eye image and a left-eye image from being recognized by an observer.SOLUTION: A plurality of pixels PIX are arranged corresponding to intersections of a plurality of scan lines 32 and a plurality of signal lines 34, and include a liquid crystal element CL that displays gradation according to a gradation potential X[n] of a signal line 34 at a selection of a scan line 32. At each selection period H, a scan line driver circuit 42 selects two neighboring scan lines 32. A display control circuit 142 receives a display data V indicating a gradation to be displayed at a pixel PIX. A signal line driver circuit 44 supplies, to each of four neighboring pixels PIX, a gradation potential X[n] according to a gradation calculated as a weighted average of the gradation designated to each of the four neighboring pixels PIX by the display data V.

Description

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

  2. Description of the Related Art Conventionally, a frame sequential stereoscopic viewing method that alternately displays a right-eye image and a left-eye image in a time division manner has been proposed. During the period in which one of the right-eye image and the left-eye image changes to the other, the right-eye image and the left-eye image are mixed, so it is difficult for the observer to recognize a clear stereoscopic effect when viewing the image. (Crosstalk). In order to solve the above problem, for example, Patent Document 1 discloses a period in which one of the right-eye image and the left-eye image changes to the other (that is, a period in which the right-eye image and the left-eye image are mixed). Discloses a technique in which both the right-eye shutter and the left-eye shutter of the stereoscopic glasses are closed to prevent the observer from seeing an image.

  Specifically, as shown in FIG. 16, the period for the right eye corresponding to the image for the right eye and the period for the left eye corresponding to the image for the left eye are alternately set. In the first half of the right-eye period, the display image is updated from the left-eye image to the right-eye image, and in the second half period, the right-eye image is displayed. In the first half of the left-eye period, the display image is displayed for the right eye. The image is updated from the image to the left eye image, and the left eye image is displayed in the second half period. In the first half period of each of the right eye period and the left eye period, both the right eye shutter and the left eye shutter are controlled to be closed. Therefore, the mixture of the right eye image and the left eye image (crosstalk) is not perceived by the observer.

JP 2009-25436 A

  However, in the stereoscopic (3D) display that alternately displays the image for the right eye and the image for the left eye as in Patent Document 1, the frame frequency of the image display is set to be twice or more that of the planar view (2D) display. Since it is necessary to increase the transfer speed of the image signal and the operation speed of the drive circuit, there is a problem that the circuit scale and manufacturing cost of the drive circuit increase. In view of the above circumstances, the present invention suppresses the perception of the mixture of the right-eye image and the left-eye image by the observer, and does not require an increase in the operation speed, and stereoscopic display It aims at realizing.

  In order to solve the above problems, an electro-optical device according to the present invention is an electro-optical device that alternately displays a right-eye image and a left-eye image for each display period. Corresponding to a plurality of scanning lines including a first scanning line and a plurality of second scanning lines, a plurality of signal lines intersecting the plurality of scanning lines, and a plurality of intersections of the plurality of scanning lines and the plurality of signal lines. In each of the plurality of pixels arranged in the display period of the right eye image and the display period of the left eye image, the first unit period of the display period is adjacent to each other among the plurality of scanning lines. A first set of scanning lines including the first scanning line and the second scanning line is sequentially selected for each selection period, and in the second unit period after the elapse of the first unit period, the first unit period Before adjacent to each other in a combination shifted by one from the first set of scanning lines selected in A first driving circuit that sequentially selects a second set of scanning lines each including the first scanning line and the second scanning line for each selection period; and display data that indicates a gradation to be displayed by each of the plurality of pixels. In each of the selection periods, the pixels corresponding to the first set of scan lines or the second set of scan lines selected by the first drive circuit are divided into four pixels adjacent in the matrix direction. A weighted average of each gradation to be displayed by the four pixels belonging to the block is calculated based on the display data, and a gradation potential corresponding to the calculated gradation is supplied to the four pixels belonging to the block. 2 drive circuit.

In the above configuration, two adjacent scanning lines are simultaneously selected, and a common gradation potential is supplied to four adjacent pixels (blocks). Therefore, the period in which the right-eye image and the left-eye image are mixed is shortened as compared with the configuration in which the scanning lines are sequentially selected one by one in each display period and the gradation potential is supplied to each pixel. The Thus, both the right eye image and the left eye are controlled by controlling both the right eye shutter and the left eye shutter of the stereoscopic glasses within the period in which the right eye image and the left eye image are mixed. Even when it is suppressed that the observer mixes with the image for use, it is possible to improve the brightness of the display image. In addition, it is necessary to increase the transfer speed of the image signals of the right-eye image and the left-eye image and the operation speed of the driving circuit (scanning line driving circuit and signal line driving circuit) as compared with the planar view (2D) display. Absent. Accordingly, there is an advantage that stereoscopic display can be realized with a drive circuit having an operation speed equivalent to that of a drive circuit used for a planar image (that is, the circuit scale and manufacturing cost of the drive circuit can be reduced).
Note that the resolution of the display image is reduced at the end of each of the first unit period and the second unit period, but in the second unit period, the image displayed in the first unit period is displayed in the second unit period. Since the images are sequentially updated to each image, there is also an advantage that a decrease in the resolution of the display image in each unit period is hardly perceived by the observer.
Further, the gradation potential corresponding to the gradation calculated as the weighted average of the gradation specified by the display data for each of the four pixels is supplied to each of the four pixels belonging to the block. Therefore, compared with the case where the gradation specified by the display data is not weighted average, the difference between the gradation specified for a certain pixel in the first unit period and the gradation specified in the second unit period is reduced. Can do. That is, it is possible to reduce the possibility that an observer perceives the difference between the gradation specified in the first unit period and the gradation specified in the second unit period as “flicker”. There is an advantage.

The electro-optical device of the present invention is an electro-optical device that alternately displays a right-eye image and a left-eye image for each display period, and includes a plurality of first scanning lines and a plurality of alternately arranged first scanning lines. A plurality of scanning lines composed of second scanning lines, a plurality of signal lines intersecting with the plurality of scanning lines, and a plurality of lines arranged corresponding to the intersections of the plurality of scanning lines and the plurality of signal lines. In each of the pixel, the display period of the right-eye image, and the display period of the left-eye image, in the first unit period of the display period, the first scanning lines adjacent to each other among the plurality of scanning lines and the A first set of scanning lines including the second scanning lines is sequentially selected for each selection period, and the second unit period after the first unit period has elapsed is selected in the first unit period. The first scan line and the second run which are adjacent to each other in a combination shifted by one line from a set of scan lines A first drive circuit for sequentially selecting a second set of scanning lines each consisting of a line for each selection period, and display data indicating a gradation to be displayed by each of the plurality of pixels, and each of the selection periods The pixels corresponding to the first set of scanning lines or the second set of scanning lines selected by the first drive circuit are defined as four pixels adjacent to each other in the matrix direction, and four pixels belonging to the block. When the maximum gradation among the gradations to be displayed is the maximum display gradation, the minimum gradation is the minimum display gradation, and the difference between the maximum display gradation and the minimum display gradation is the difference gradation, When the difference gradation is larger than a predetermined threshold, a weighted average of each gradation to be displayed by the four pixels belonging to the block is calculated based on the display data, and a gradation potential corresponding to the calculated gradation To the four pixels belonging to the block When the difference gray level is equal to or lower than the predetermined threshold, among the four pixels belonging to the block, the gray level potential corresponding to the gray level to be displayed by the pixel at a predetermined position is given to the four pixels belonging to the block. And a second drive circuit to be supplied.
According to the present invention, when the difference between the maximum gradation and the minimum gradation among the gradations to be displayed by the four pixels belonging to the block is larger than the predetermined threshold value, the display data is stored in the four pixels. A gradation potential corresponding to a gradation calculated as a weighted average of gradations designated for each is supplied to the four pixels. Thereby, there is an advantage that “flickering” due to the difference between the gradation specified for each pixel in the first unit period and the gradation specified in the second unit period can be suppressed.

In the electro-optical device described above, it is preferable that a weighting coefficient to be given to the gradation of each pixel is larger than 0 in the calculation of the weighted average.
According to the present invention, for supplying the gradation potential corresponding to the gradation calculated as the weighted average of the gradation designated by the display data to each of the four pixels for the four pixels belonging to the block, It is possible to suppress “flicker” due to a change in gradation displayed by a pixel.

In the above-described electro-optical device, it is preferable that the weighting coefficient to be given to the gradation of each pixel is an equal value.
According to the present invention, for supplying the gradation potential corresponding to the gradation calculated as the simple average of the gradation designated by the display data to each of the four pixels for the four pixels belonging to the block, There is an advantage that it is possible to simplify a configuration for suppressing “flickering” due to a change in gradation displayed by a pixel.

In the above-described electro-optical device, the maximum gradation among the gradations to be displayed by the four pixels belonging to the block is set as the maximum display gradation, and the gradations to be displayed by the four pixels belonging to the block The minimum gradation is set as the minimum display gradation, the average value of gradations specified for each of a predetermined number of pixels including the four pixels belonging to the block is set as the average gradation, and the maximum display gradation and the average When the absolute value of the difference between the gradations is the first difference gradation and the absolute value of the difference between the average gradation and the minimum display gradation is the second difference gradation, the first difference gradation is When larger than the second difference gradation, when the weighting coefficient of the pixel corresponding to the maximum display gradation is larger than the weighting coefficient of the other pixels, and when the second difference gradation is larger than the first difference gradation, Weighting coefficient of pixel corresponding to the minimum display gradation Is preferably made larger than the weighting coefficient of other pixels.
According to the present invention, the gradation displayed by the four pixels belonging to the block, the gradation specified by the display data for the four pixels, and the display data for the predetermined number of pixels including the four pixels are displayed. Is controlled based on the relationship with the gradation specified by. As a result, a clear image close to the image indicated by the display data can be displayed.

The electro-optical device of the present invention is an electro-optical device that alternately displays a right-eye image and a left-eye image for each display period, and includes a plurality of first scanning lines and a plurality of alternately arranged first scanning lines. A plurality of scanning lines composed of second scanning lines, a plurality of signal lines intersecting with the plurality of scanning lines, and a plurality of lines arranged corresponding to the intersections of the plurality of scanning lines and the plurality of signal lines. In each of the pixel, the display period of the right-eye image, and the display period of the left-eye image, in the first unit period of the display period, the first scanning lines adjacent to each other among the plurality of scanning lines and the A first set of scanning lines composed of the second scanning lines is sequentially selected every selection period, and in the second unit period after the first unit period, the first period selected in the first unit period is selected. The first scan line and the second scan line are combined with a single shift from one set of scan lines. A first driving circuit that sequentially selects a second set of scanning lines for each selection period, and display data indicating a gradation to be displayed by each of the plurality of pixels are supplied. Each of the floors to be displayed by the four pixels belonging to the block, with the pixels corresponding to the first set of scanning lines or the second set of scanning lines selected by one driving circuit as four blocks adjacent in the matrix direction When the average value of the tone is the first average gradation and the average value of the gradation specified for each of the predetermined number of pixels including the four pixels belonging to the block is the second average gradation, the first average gradation In each of the unit period and the second unit period, a gradation control coefficient is determined based on each gradation to be displayed by the four pixels belonging to the block and the second average gradation, and the gradation control coefficient and the second unit period are determined. Obtained by multiplying by 1 average gradation Characterized in that the gradation potentials corresponding to tone to anda second driving circuit for supplying to the four pixels belonging to the block.
According to the present invention, the gradation displayed by the four pixels belonging to the block, the gradation specified by the display data for the four pixels, and the display data for the predetermined number of pixels including the four pixels are displayed. Is controlled by a gradation control coefficient determined based on the relationship with the gradation specified by. As a result, a clear image close to the image indicated by the display data can be displayed.

In the electro-optical device described above, when the maximum gradation among the gradations to be displayed by the four pixels belonging to the block is the maximum display gradation and the minimum gradation is the minimum display gradation, When the absolute value of the difference between the maximum display gradation and the second average gradation is larger than the absolute value of the difference between the second average gradation and the minimum display gradation, the driving circuit The control coefficient is set to a value larger than 1, and the absolute value of the difference between the maximum display gradation and the second average gradation is the absolute value of the difference between the second average gradation and the minimum display gradation. Is smaller than 1, the gradation control coefficient is preferably set to a value larger than 0 and smaller than 1.
According to the present invention, the gradation is displayed so that the difference between the gradation displayed by the four pixels belonging to the block and the gradation specified by the display data for the plurality of pixels existing around the four pixels increases. Determine the key control coefficient. As a result, a clear image close to the image indicated by the display data can be displayed.

In the electro-optical device described above, it is preferable that the predetermined number of pixels includes four pixels belonging to the block and twelve pixels surrounding the block.
According to the present invention, a clear image close to the image indicated by the display data can be displayed.
The electro-optical device of the present invention is an electro-optical device that alternately displays a right-eye image and a left-eye image for each display period, and includes a plurality of first scanning lines and a plurality of alternately arranged first scanning lines. A plurality of scanning lines composed of second scanning lines, a plurality of signal lines intersecting with the plurality of scanning lines, and a plurality of lines arranged corresponding to the intersections of the plurality of scanning lines and the plurality of signal lines. In each of the pixel, the display period of the right-eye image, and the display period of the left-eye image, in the first unit period of the display period, the first scanning lines adjacent to each other among the plurality of scanning lines and the A first set of scanning lines including the second scanning lines is sequentially selected for each selection period, and the second unit period after the first unit period has elapsed is selected in the first unit period. The first scanning line and the first scanning line that are adjacent to each other in a combination shifted by a plurality of lines from one scanning line. A first driving circuit for sequentially selecting a second set of scanning lines each consisting of a scanning line for each selection period; and display data indicating a gradation to be displayed by each of the plurality of pixels. In each of the four blocks belonging to the block, the pixels corresponding to the first set of scanning lines or the second set of scanning lines selected by the first drive circuit are divided into four or more pixels adjacent in the matrix direction. A second drive circuit that generates an image signal to be displayed by at least two pixels based on the display data, and supplies a gradation potential corresponding to the generated gradation to the four or more pixels belonging to the block; It is characterized by comprising.
According to the present invention, for each of four or more pixels belonging to a block, a gradation corresponding to a gradation calculated as a weighted average of gradations specified by the display data for each of the four or more pixels. Supply potential. Therefore, compared with the case where the gradation specified by the display data is not weighted average, the difference between the gradation specified for a certain pixel in the first unit period and the gradation specified in the second unit period is reduced. Can do. That is, it is possible to reduce the possibility that an observer perceives the difference between the gradation specified in the first unit period and the gradation specified in the second unit period as “flicker”. There is an advantage.

In the electro-optical device described above, each of the right-eye image display period and the left-eye image display period includes the first unit period and the second unit period. In each of the plurality of control periods including the display period of the right-eye image and the display period of the left-eye image, the circuit is configured such that each of the plurality of control periods includes the first control period. In the first unit period of the display period, the polarity of the gradation potential with respect to the reference potential is set to one of positive polarity and negative polarity, and in the second unit period of each display period. In the second control period immediately after the first control period among the plurality of control periods, the polarity of the gradation potential is set to be the other polarity, in the first unit period of each display period , The polarity of the gradation potential Square and sets so that the polarity of, in the second unit period of each display period, it is preferable and sets the polarity of the gray scale potential to be the one polarity.
According to the present invention, the time length in which the gradation potential according to the designated gradation of the image for the right eye or the image for the left eye is set to the positive polarity and the time length set to the negative polarity are equalized. There is an advantage that application of a DC voltage to the pixel can be suppressed. Specifically, in the case where the pixel includes a liquid crystal element, the application of a direct current component to the liquid crystal element can be suppressed by setting the reference potential to the potential of the common electrode, so that there is an advantage that deterioration of the liquid crystal element can be suppressed. .

The electro-optical device described above is an electro-optical device that displays a right-eye image and a left-eye image stereoscopically viewed with stereoscopic glasses including a right-eye shutter and a left-eye shutter. Both the right-eye shutter and the left-eye shutter are controlled to be closed in each display period including at least a part of the first unit period, and the right-eye image is displayed in each display period. The right eye shutter is controlled to be in an open state and the left eye shutter is controlled to be in a closed state in a period including at least a part of the second unit period, and the second eye period in each display period of the left eye image is controlled. And a glasses control circuit that controls the left-eye shutter in an open state and controls the right-eye shutter in a closed state in a period including at least a part of the unit period. It is preferred.
According to the present invention, the right-eye image is controlled by controlling both the right-eye shutter and the left-eye shutter of the stereoscopic glasses within the period in which the right-eye image and the left-eye image are mixed. And the left eye image can be prevented from being perceived by the observer.

In the electro-optical device described above, each of the right-eye image display period and the left-eye image display period includes the first unit period, the second unit period, the first unit period, and In the first unit period of each display period, the second drive circuit includes the second unit period, and the polarity of the gradation potential with respect to a reference potential is one of positive polarity and negative polarity in the first unit period of each display period. In the first second unit period of each display period, the gradation potential is set to the other polarity, and in the last first unit period of each display period, The polarity of the adjustment potential is set to be the other polarity, and the gradation potential is set to be one polarity in the last second unit period of each display period. Is preferred.
According to the present invention, the time length in which the gradation potential according to the designated gradation of the image for the right eye or the image for the left eye is set to the positive polarity and the time length set to the negative polarity are equalized. There is an advantage that application of a DC voltage to the pixel can be suppressed.

The electro-optical device described above is an electro-optical device that displays a right-eye image and a left-eye image stereoscopically viewed with stereoscopic glasses including a right-eye shutter and a left-eye shutter. In each display period, both the right-eye shutter and the left-eye shutter are controlled to be closed in a period including at least a part of the first first unit period, and each display period of the right-eye image The right-eye shutter is controlled to be in an open state and the left-eye shutter is closed in a period including at least a part from the start of the first second unit period to the end of the last second unit period The left-eye shutter in a period including at least a part from the start of the first second unit period to the end of the last second unit period in each display period of the left-eye image. It is preferable that the right-eye shutter to control the state characterized by comprising a glass control circuit for controlling the closed state, the.
According to this invention, among the four unit periods constituting each display period, in the first first unit period, both the right-eye shutter and the left-eye shutter of the stereoscopic glasses are controlled to be closed. Thus, it is possible to prevent the observer from perceiving the mixture of the right-eye image and the left-eye image. Further, in each display period, the right-eye shutter or the left-eye shutter is controlled to be open in a period including at least a part from the start of the first second unit period to the end of the last second unit period. Therefore, the brightness of the display image can be improved.

  The electro-optical device according to each aspect described above is employed in various electronic apparatuses as a display body. For example, a stereoscopic display device including the electro-optical device according to each of the above aspects and stereoscopic glasses controlled by the glasses control circuit is exemplified as the electronic apparatus of the present invention.

1 is a block diagram of a stereoscopic display device according to a first embodiment of the present invention. It is a circuit diagram of a pixel circuit. It is explanatory drawing of operation | movement of a stereoscopic display apparatus. It is explanatory drawing of operation | movement of a scanning line drive circuit. It is explanatory drawing showing the block designated in each unit period. It is explanatory drawing showing the display data and the gradation which a stereoscopic display device displays. It is explanatory drawing showing the gradation which an observer perceives. It is explanatory drawing of operation | movement of contrast 1. It is explanatory drawing showing the display data supplied to the three-dimensional display apparatus which concerns on the contrast 1, and the gradation to display. It is explanatory drawing of operation | movement of 2nd Embodiment. It is explanatory drawing explaining the weighted average which concerns on the modification 6. FIG. It is explanatory drawing showing the gradation which the stereoscopic display apparatus which concerns on the modification 6 displays, and the gradation which an observer perceives. It is a perspective view of an electronic device (projection type display device). It is a perspective view of an electronic device (personal computer). It is a perspective view of an electronic device (cellular phone). It is explanatory drawing of the stereoscopic vision movement operation | movement in a prior art.

<First Embodiment>
FIG. 1 is a block diagram of a stereoscopic display apparatus 100 according to the first embodiment of the present invention. The stereoscopic display device 100 is an electronic device that displays a stereoscopic image that makes an observer perceive a stereoscopic effect using an active shutter system, and includes an electro-optical device 10 and stereoscopic glasses 20. The electro-optical device 10 alternately displays the right-eye image GR and the left-eye image GL to which parallax is given in a time-division manner.

  The stereoscopic glasses 20 are glasses-type instruments worn by an observer when viewing a stereoscopic image displayed by the electro-optical device 10, and include a right-eye shutter 22 and a left-eye positioned in front of the observer's right eye. And a shutter 24 for the left eye located in front of the camera. Each of the right-eye shutter 22 and the left-eye shutter 24 is controlled to an open state (transmission state) that transmits the irradiation light and a closed state (blocking state) that blocks the irradiation light. For example, a liquid crystal shutter that changes from one of the open state and the closed state to the other by changing the alignment direction of the liquid crystal according to the applied voltage can be employed as the right-eye shutter 22 and the left-eye shutter 24.

  The electro-optical device 10 in FIG. 1 includes an electro-optical panel 12 and a control circuit 14. The electro-optical panel 12 includes a pixel unit 30 in which a plurality of pixels (pixel circuits) PIX are arranged, and a drive circuit 40 that drives each pixel PIX. In the pixel unit 30, M scanning lines 32 extending in the x direction and N signal lines 34 extending in the y direction intersecting the x direction are formed (M and N are natural numbers). A plurality of pixels PIX in the pixel unit 30 are arranged in a matrix of vertical M rows × horizontal N columns corresponding to each intersection of the scanning lines 32 and the signal lines 34.

  The drive circuit 40 includes a scanning line drive circuit 42 and a signal line drive circuit 44. The scanning line driving circuit 42 sequentially selects the scanning lines 32 by supplying the scanning signals Y [1] to Y [M] corresponding to the scanning lines 32. The scanning signal Y [m] (m = 1 to M) is set to a predetermined selection potential, whereby the m-th row scanning line 32 is selected. The signal line driving circuit 44 supplies gradation potentials X [1] to X [N] to each of the N signal lines 34 in synchronization with the selection of the scanning line 32 by the scanning line driving circuit 42. The gradation potential X [n] (n = 1 to N) is variably set according to the gradation designated by the image signal G (right eye image GR, left eye image GL) for each pixel PIX. The polarity of the gradation potential X [n] with respect to a predetermined reference potential is periodically reversed.

  FIG. 2 is a circuit diagram of each pixel PIX. As shown in FIG. 2, each pixel PIX includes a liquid crystal element CL and a selection switch SW. The liquid crystal element CL is an electro-optical element composed of a pixel electrode 62 and a common electrode 64 facing each other and a liquid crystal 66 between the two electrodes. The transmittance (display gradation) of the liquid crystal 66 changes according to the voltage applied between the pixel electrode 62 and the common electrode 64. The selection switch SW is composed of an N-channel type thin film transistor whose gate is connected to the scanning line 32, and is interposed between the liquid crystal element CL and the signal line 34 to establish electrical connection (conduction / insulation) between them. Control. By setting the scanning signal Y [m] to the selection potential, the selection switch SW in each pixel PIX in the m-th row is simultaneously turned on. Each pixel PIX (liquid crystal element CL) displays a gradation corresponding to the gradation potential X [n] of the signal line 34 when the selection switch SW is controlled to be in an ON state (that is, when the scanning line 32 is selected). . A configuration in which an auxiliary capacitor is connected in parallel to the liquid crystal element CL can also be adopted.

The control circuit 14 in FIG. 1 includes a display control circuit 142 that controls the electro-optical panel 12 and a glasses control circuit 144 that controls the stereoscopic glasses 20. Note that a configuration in which the display control circuit 142 and the glasses control circuit 144 are mounted on a single integrated circuit, or a configuration in which the display control circuit 142 and the glasses control circuit 144 are distributed in separate integrated circuits may be employed.
The display control circuit 142 is supplied with display data V (right-eye display data VR, left-eye display data VL) specifying the gradation of each pixel PIX from an external circuit. The display control circuit 142 generates an image signal G (right eye image GR, left eye image GL) based on the display data V.
In addition, the display control circuit 142 controls the drive circuit 40 so that the right-eye image GR and the left-eye image GL to which parallax is given are displayed on the pixel unit 30 in a time division manner. Specifically, the display control circuit 142 controls the drive circuit 40 so that the drive circuit 40 performs the following operations.

  FIG. 3 is an explanatory diagram of the operation of the electro-optical device 10. The operation period of the electro-optical device 10 is divided into a plurality of control periods T (T1, T2). The control period T1 and the control period T2 are alternately arranged on the time axis. Each control period T (T1, T2) is divided into two display periods P having a predetermined length (a display period PR for the right eye and a display period PL for the left eye). In the right-eye display period PR, the right-eye image GR is displayed on the pixel unit 30, and in the left-eye display period PL, the left-eye image GL is displayed on the pixel part 30. The right eye display period PR and the left eye display period PL are alternately arranged on the time axis. That is, one control period T (T1, T2) is constituted by two adjacent display periods P (a set of the right-eye display period PR and the left-eye display period PL). Each display period P (PR, PL) is divided into two unit periods U (U1, U2) having the same time length. The unit period U2 follows the unit period U1.

FIG. 4 is an explanatory diagram of the operation of the scanning line driving circuit 42 (first driving circuit) in each display period P (PR, PL). As shown in FIG. 4, in the unit period U1 of each display period P, the scanning line driving circuit 42 divides the M scanning lines 32 into two adjacent groups (hereinafter referred to as “first group”). Are sequentially selected every selection period H. The first set consists of one scanning line 32 in an even number row ((2p) row) and an odd number row ((2p-1) row) adjacent to the scanning line 32 on the negative side in the y direction. It consists of one scanning line 32 (p is a natural number).
The scanning line driving circuit 42 sets the scanning signal Y [2p-1] and the scanning signal Y [2p] to the selection potential in one selection period H in the unit period U1, thereby making the first set of two lines. The scanning lines 32 are selected simultaneously. For example, in the first selection period H in the unit period U1, the two scanning lines 32 in the first row and the second row are simultaneously selected, and in the second selection period H in the unit period U1, the third row is selected. And the two scanning lines 32 in the fourth row are selected simultaneously.

In the unit period U2 of each display period P, the scanning line driving circuit 42 has a plurality of sets (hereinafter referred to as “second set”) in which the M scanning lines 32 are divided into two adjacent to each other in a combination different from the first set. ") Are sequentially selected for each selection period H. The second set consists of one scanning line 32 in an even numbered row ((2p) th row) and an odd numbered row ((2p + 1) th row) adjacent to the scanning line 32 on the positive side in the y direction. It is composed of one scanning line 32. In other words, the first set and the second set have a relationship shifted in the y direction by one scanning line 32.
The scanning line driving circuit 42 sets the scanning signal Y [2p] and the scanning signal Y [2p + 1] to the selection potential in one selection period H in the unit period U2, thereby setting the second set of two lines. The scanning lines 32 are selected simultaneously. For example, in the first selection period H in the unit period U2, the two scanning lines 32 in the second row and the third row are selected at the same time, and in the second selection period H in the unit period U2, the fourth row is selected. And the two scanning lines 32 in the fifth row are selected simultaneously. In the description of the first embodiment, for the sake of convenience, the case where the first and Mth scanning lines 32 are not selected in the unit period U2 is illustrated, but the first and second lines are not selected in the unit period U2. It is also possible to select the Mth scanning line 32.
In the following, the odd-numbered scanning lines 32 may be referred to as first scanning lines, and the even-numbered scanning lines 32 may be referred to as second scanning lines.

In each selection period H within the right-eye display period PR, the signal line driving circuit 44 outputs the gradation potentials X [1] to X [N] corresponding to the image signal of the right-eye image GR to N signals. The gradation potentials X [1] to X [N] corresponding to the image signal of the left eye image GL are supplied to the lines 34 and N signals in each selection period H within the left eye display period PL. Each is supplied to a line 34. That is, the display control circuit 142 and the signal line drive circuit 44 generate the image signal G based on the display data V supplied from the external circuit, and apply the gradation potential X [n] corresponding to the image signal G to each signal. It functions as a second drive circuit that supplies the line 34.
Although details will be described later, in the unit period U1, the gradation potential X [2q] and the gradation potential X [2q-1] are set to the same potential, and these are the signals in the (2q-1) -th column. The line 34 and the signal line 34 in the (2q) -th column are supplied simultaneously. That is, in the unit period U1, the signal line driving circuit 44 has one signal line 34 in the odd-numbered column ((2q-1) th column) and one signal line 34 in the even-numbered column ((2q) th column). Are simultaneously supplied with a common gradation potential X [2q-1] (q is a natural number). Further, in the signal line driving circuit 44, in the unit period U2, one signal line 34 in the even-numbered column ((2q) th column) and one signal line 34 in the odd-numbered column ((2q + 1) th column) In contrast, a common gradation potential X [2q] is supplied simultaneously.
Hereinafter, the signal lines 34 in the odd columns may be referred to as first signal lines, and the signal lines 34 in the even columns may be referred to as second signal lines.

  FIG. 3 shows the time change of the polarity (write polarity) of each gradation potential X [n] with respect to a predetermined reference potential (for example, the potential of the common electrode 64). Since the gradation potential X [n] is supplied to the pixel electrode 62 of the liquid crystal element CL, the polarity illustrated in FIG. 3 can be regarded as the polarity of the voltage applied to the liquid crystal element CL.

  As shown in FIG. 3, the signal line drive circuit 44 inverts the polarity of the gradation potential X [n] for each unit period U (U1, U2) within each control period T, and controls each control before and after. In the period T, the gradation potential X [n] in each unit period U is set to a reverse polarity. Specifically, in the control period T1, the polarity of the gradation potential X [n] is set to positive (+) in the unit period U1 of each display period P (PR, PL) and each display period P. In the unit period U2, the negative polarity (-) is set. On the other hand, in the control period T2 immediately after the control period T1, the polarity of the gradation potential X [n] is set to negative polarity (−) in the unit period U1 of each display period P (PR, PL). The positive polarity (+) is set in the unit period U2 of the display period P.

In the following, relationship between display data V (right eye display data VR, left eye display data VL), image signal G (right eye image GR, left eye image GL), and gradation potential X [n]. Will be explained.
In the following description, the gradation specified by the right-eye display data VR for the pixel PIX in the m-th row and the n-th column of the display data V is represented as a gradation VR [m] [n]. A gray scale specified by the eye display data VL for the pixel PIX in the m-th row and the n-th column is represented as a gray scale VL [m] [n]. Also, the gradation designated by the image signal G of the right-eye image GR for the pixel PIX in the m-th row and the n-th column is represented as a gradation GR [m] [n], and the image signal G of the left-eye image GL is the first. The gradation designated for the pixel PIX in the m-th row and the n-th column is represented as a gradation GL [m] [n].

Of the unit period U1 of the display period PR for the right eye within each control period T (T1, T2), the two scanning lines 32 of the (2p-1) th row and the (2p) th row constituting the first set. In the selection period H in which the right eye image GR is designated as the pixel PIX in the (2p-1) th row (2q-1) column, the gradation GR [2p-1] [2q-1]
The grayscale VR [2p-1] [2q-1], the (2p) th row (2q-), the display data VR for the right eye, which is designated for the pixel PIX in the (2p-1) th row (2q-1) th column. 1) Gradation VR [2p] [2q-1] specified for the pixel PIX in the column, Gradation VR [2p-1] [2q] specified for the pixel PIX in the (2p-1) th row (2q) column , And the weighted average of gradations VR [2p] [2q] specified for the pixel PIX in the (2p) th row and the (2q) th column.

More specifically, the gradation GR [2p-1] [2q-1] is determined by the following equation (1).
GR [2p-1] [2q-1]
= {( _{W2p-1, 2q-1} x VR [2p-1] [2q-1]) + ( _{w2p , 2q-1} x VR [2p] [2q-1])
+ (W _2p-1,2q × VR [2p-1] [2q]) + (w _{2p, 2q} × VR [2p] [2q])}
÷ { _{w2p-1 , 2q-1} + _{w2p , 2q-1} + _{w2p-1 , 2q} + _{w2p , 2q} } Equation (1)
Here, the four weighting factors w _{m, n} appearing in the equation (1) are real numbers larger than “0”. If the calculation result on the right side of equation (1) is not an integer, the gradation GR [2p-1] [2q-1] is rounded off to the right of the equation (1). What is necessary is just to calculate by performing further calculations, such as truncation. In the present embodiment, each of the four weighting factors w _{m, n} is set to an equal value, for example, “1”. That is, in the present embodiment, the gradation GR [2p-1] [2q-1] is a gradation specified by the display data V for each of the four pixels PIX as shown in the following equation (2). Calculated as a simple average (arithmetic mean) of VR.
GR [2p-1] [2q-1]
= {VR [2p-1] [2q-1] + VR [2p] [2q-1]
+ VR [2p-1] [2q] + VR [2p] [2q]} / 4 Formula (2)

As described above, the signal line driving circuit 44 applies the gradation potential X [2q-1] corresponding to the gradation GR [2p-1] [2q-1] to the (2q-1) th column and the (2q) th column. Are commonly supplied to the two signal lines 34. Therefore, (2p-1) th row, (2q-1) th column, (2p-1) th row, (2q) th column, (2p) th row, (2q-1) th column, and (2p) th row A gradation potential X corresponding to the gradation GR [2p-1] [2q-1] is commonly supplied to four adjacent pixels PIX located in the (2q) th column.
Thus, as shown in FIG. 5A, in the unit period U1 of the right eye display period PR, the pixel PIX in the odd-numbered row and the odd-numbered column is set as the “reference pixel”, and the reference pixel, the reference pixel and the positive pixel in the x direction are Odd-numbered even-numbered pixels PIX adjacent to the side, even-numbered odd-numbered pixels PIX adjacent to the reference pixel in the y-direction positive side, and one reference pixel in the x-direction positive side and y-direction positive side The four pixels PIX consisting of the pixels PIX of even rows and even columns shifted one by one are designated as “blocks”, and the image signal G of the right eye image GR is designated as the reference pixel for the four pixels PIX belonging to the block. The gradation potential X corresponding to the gradation to be supplied is supplied in common. A block having the pixel PIX in the m-th row and the n-th column as a reference pixel is hereinafter referred to as a block BL [m] [n].
For example, as shown in the part (R1) of FIG. 3, in the first selection period H in the unit period U1, the gradation potential X corresponding to the gradation GR [1] [2q-1] is applied to the block BL. [1] [2q-1] (a block BL having the odd-numbered column in the first row as a reference pixel) is commonly supplied to the four pixels PIX. In the second selection period H in the unit period U1, the gradation potential X corresponding to the gradation GR [3] [2q-1] is applied to the block BL [1] [2q-1] (third row). Are supplied in common to the four pixels PIX belonging to the block BL) having the odd-numbered columns as reference pixels.

  As described above, in the unit period U1, among the plurality of pixels PIX arranged in the vertical M rows × horizontal N columns, each of the plurality of pixels PIX located in the odd rows and the odd columns is used as the reference pixel, and the plurality of reference pixels. A plurality of blocks BL corresponding to each of these are designated. Then, a common gradation potential X is supplied to each of the four pixels PIX belonging to each block BL specified in the unit period U1. Accordingly, at the end of the unit period U1 of the right eye display period PR, the resolution in the x direction is reduced by half and the resolution in the y direction is reduced by half with respect to the image to be originally displayed indicated by the display data V. The right-eye image GR that has been reduced to the above is displayed on the pixel unit 30.

In the unit period U2 of the right eye display period PR within each control period T (T1, T2), the x direction and the y direction are relative to the block BL specified in the unit period U1 of the right eye display period PR. Thus, four pixels PIX shifted by one pixel are designated as a block BL. Then, the gradation potential X corresponding to the common gradation is supplied to the four pixels PIX belonging to the block BL designated in the unit period U2.
More specifically, in the unit period U2 of the right-eye display period PR in each control period T (T1, T2), two lines (2p) and (2p) constituting the second set. In the selection period H during which the scanning line 32 is selected, the gradation GR [2p] [2q] (that is, for the right eye) that the image GR for the right eye designates the pixel PIX in the (2p) th row and the (2q) th column. The gray scale GR [2p-1] [2q-1]) designated by the image GR for the four pixels PIX belonging to the block BL [2p] [2q] has the display data VR for the right eye (2p). The gradation VR [2p] [2q] specified for the pixel PIX in the row (2q) column and the gradation VR [2p + 1] [2q] specified for the pixel PIX in the (2p + 1) th row (2q) column ], The gradation VR [2p] [2q + 1] specified for the pixel PIX in the (2p) th row and the (2q + 1) th column, and the pixel in the (2p + 1) th row (2q + 1) th column The weighted average of gradations VR [2p + 1] [2q + 1] specified for PIX is determined by the following equation (3).
GR [2p] [2q]
= {( _{W2p , 2q} x VR [2p] [2q]) + ( _w2p + 1, 2q x VR [2p + 1] [2q])
+ (W _{2p, 2q + 1} × VR [2p] [2q + 1]) + (w _{2p + 1,2q + 1} × VR [2p + 1] [2q + 1])}
÷ {w _{2p, 2q} + w _{2p + 1, 2q +} w _{2p, 2q + 1} + w _{2p + 1, 2q + 1} } Equation (3)
Here, the four weighting factors w appearing in Expression (3) are real numbers larger than “0”. In the present embodiment, each of the four weighting factors w is set to an equal value, for example, “1”. In other words, in the present embodiment, the gradation GR [2p] [2q] has the display data V of each of the four pixels PIX belonging to the block BL [2p] [2q] as shown in the following equation (4). Is calculated as a simple average (arithmetic average) of gradations VR specified in.
GR [2p] [2q]
= {VR [2p] [2q] + VR [2p + 1] [2q]
+ VR [2p] [2q + 1] + VR [2p + 1] [2q + 1]} / 4 Formula (4)
As described above, the signal line driving circuit 44 applies the gradation potential X [2q] corresponding to the gradation GR [2p] [2q] to the two signal lines in the (2q) th column and the (2q + 1) th column. 34 is supplied in common. Therefore, it belongs to the block BL [2p] [2q], the (2p) th row (2q) th column, the (2p + 1) th row (2q) th column, the (2p) th row (2q + 1) th column, Further, the gradation potential X corresponding to the gradation GR [2p] [2q] is shared by the four adjacent pixels PIX located in the (2p + 1) th row and the (2q + 1) th column. Supplied. For example, as shown in the part (R2) of FIG. 3, in the first selection period H in the unit period U2, the gradation potential X corresponding to the gradation GR [2] [2q] is changed to the block BL [2 ] [2q] (a block BL having the even-numbered column in the second row as a reference pixel) is commonly supplied to the four pixels PIX. Further, in the second selection period H in the unit period U2, the gradation potential X corresponding to the gradation GR [4] [2q] is applied to the block BL [4] [2q] (the odd column of the fourth row). It is supplied in common to the four pixels PIX belonging to the block BL) as the reference pixel.
As described above, in the unit period U2 of the right-eye display period PR, among the plurality of pixels PIX arranged in vertical M rows × horizontal N columns, each of the plurality of pixels PIX positioned in the even rows and even columns is used as the reference pixel. A plurality of blocks BL corresponding to each of the plurality of reference pixels is designated. A common gradation potential X is supplied to each of the four pixels PIX belonging to each block BL designated in the unit period U2. Accordingly, at the end of the unit period U2 of the right eye display period PR, the resolution in the x direction is reduced by half and the resolution in the y direction is halved with respect to the image to be originally displayed indicated by the display data V. The right-eye image GR that has been reduced to the above is displayed on the pixel unit 30.

In the left eye display period PL of each control period T (T1, T2), the same operation as in the right eye display period PR is executed.
First, in the unit period U1 of the display period PL for the left eye, the block BL using the pixels PIX located in the odd rows and odd columns as the reference pixels is designated as in the unit period U1 of the display period PR for the right eye (see FIG. 5 (A)). Then, the common gradation potential X is supplied to the four pixels PIX belonging to the block BL. Specifically, among the unit periods U1 of the display period PL for the left eye within each control period T (T1, T2), 2 in the (2p-1) th and (2p) th lines constituting the first set. In a selection period H in which one scanning line 32 is selected, the gradation GL [2p− that the image GL for the left eye designates for the four pixels PIX belonging to the block BL [2p−1] [2q−1]. 1] [2q-1] is the gradation VL [2p-1] [2q-1], gradation VL [2p] [2q-1], gradation VL [2p-1] indicated by the left eye display data VL ] [2q] and gradation VL [2p] [2q] are determined by the following equation (5) as a weighted average.
GL [2p-1] [2q-1]
= {( _{W2p-1, 2q-1} x VL [2p-1] [2q-1]) + ( _{w2p , 2q-1} x VL [2p] [2q-1])
+ (W _2p-1,2q × VL [2p-1] [2q]) + (w _{2p, 2q} × VL [2p] [2q])}
÷ { _{w2p-1 , 2q-1} + _{w2p , 2q-1} + _{w2p-1 , 2q} + _{w2p , 2q} } Equation (5)
Here, the four weighting factors w appearing in Expression (5) are real numbers larger than “0”. In the present embodiment, each of the four weighting factors w is set to an equal value, for example, “1”. That is, in the present embodiment, the gradation GL [2p-1] [2q-1] has the display data V in the block BL [2p-1] [2q-1] as shown in the following equation (6). It is calculated as a simple average (arithmetic average) of gradations VL designated for each of the four pixels PIX to which it belongs.
GL [2p-1] [2q-1]
= {VL [2p-1] [2q-1] + VL [2p] [2q-1]
+ VL [2p-1] [2q] + VL [2p] [2q]} / 4 Equation (6)
Thus, it belongs to the block BL [2p-1] [2q-1], and the (2p-1) th row (2q-1) th column, the (2p-1) th row (2q) th column, the (2p) ) In the four adjacent pixels PIX located in the (2q-1) th row and the (2p) th (2q) th column, the gray level GL [2p-1] [2q-1] The grayscale potential X corresponding to is supplied in common.
That is, in the unit period U1 of the left-eye display period PL, among the plurality of pixels PIX arranged in the vertical M rows × the horizontal N columns, each of the plurality of pixels PIX located in the odd rows and odd columns is used as a reference pixel. A plurality of blocks BL corresponding to each of the plurality of reference pixels are designated. Then, a common gradation potential X is supplied to each of the four pixels PIX belonging to each block BL specified in the unit period U1. Therefore, at the time when the unit period U1 of the display period PL for the left eye ends, the resolution in the x direction is reduced by half and the resolution in the y direction is halved with respect to the image to be originally displayed indicated by the display data V. The image GL for the left eye that has been lowered to is displayed on the pixel unit 30.

In the unit period U2 of the display period PL for the left eye, the block BL using the pixels PIX located in the even rows and the even columns as the reference pixels is designated as in the unit period U2 of the display period PR for the right eye (FIG. 5 ( B)). That is, in the unit period U2 of the left-eye display period PL, four blocks shifted by one pixel in the x direction and the y direction with respect to the block BL specified in the unit period U1 of the left-eye display period PL. Pixel PIX is designated as block BL. Then, the common gradation potential X is supplied to the four pixels PIX belonging to the block BL. Specifically, in the unit period U2 of the display period PL for the left eye in each control period T (T1, T2), two lines of the (2p) row and the (2p) row that constitute the second set. In the selection period H in which the scanning line 32 is selected, the gradation GL [2p] [2q] that the image GL for the left eye designates for the four pixels PIX belonging to the block BL [2p] [2q] Gradation VL [2p] [2q], gradation VL [2p + 1] [2q], gradation VL [2p] [2q + 1], and gradation VL [2p + 1] indicated by the display data for eye VL The weighted average of [2q + 1] is determined by the following equation (7).
GL [2p] [2q]
= {( _{W2p , 2q} x VL [2p] [2q]) + ( _w2p + 1, 2q x VL [2p + 1] [2q])
+ (W _{2p, 2q + 1} × VL [2p] [2q + 1]) + (w _{2p + 1,2q + 1} × VL [2p + 1] [2q + 1])}
÷ {w _{2p, 2q} + w _{2p + 1,2q} + w _{2p, 2q + 1} + w _{2p + 1,2q + 1} } (7)
Here, the four weighting factors w appearing in the equation (7) are real numbers larger than “0”. In the present embodiment, each of the four weighting factors w is set to an equal value, for example, “1”. In other words, in the present embodiment, the gradation GL [2p] [2q] has the display data V of each of the four pixels PIX belonging to the block BL [2p] [2q] as shown in the following equation (8). Is calculated as a simple average (arithmetic average) of the gradations VL designated by.
GL [2p] [2q]
= {VL [2p] [2q] + VL [2p + 1] [2q]
+ VL [2p] [2q + 1] + VL [2p + 1] [2q + 1]} / 4 Equation (8)
Thus, it belongs to the block BL [2p] [2q], the (2p) th row (2q) th column, the (2p + 1) th row (2q) th column, the (2p) th row (2q + 1) th The gradation potential X corresponding to the gradation GL [2p] [2q] is applied to the four adjacent pixels PIX located in the column and the (2p + 1) th row and the (2q + 1) th column. Commonly supplied. That is, in the unit period U2 of the left eye display period PL, among the plurality of pixels PIX arranged in vertical M rows × horizontal N columns, each of the plurality of pixels PIX located in even rows and even columns is used as a reference pixel. A plurality of blocks BL corresponding to each of the plurality of reference pixels are designated. A common gradation potential X is supplied to each of the four pixels PIX belonging to each block BL designated in the unit period U2. Therefore, at the end of the unit period U2 of the display period PL for the left eye, the resolution in the x direction is reduced by half and the resolution in the y direction is reduced by half with respect to the image to be originally displayed indicated by the display data V. The image GL for the left eye that has been lowered to is displayed on the pixel unit 30.

  In the configuration in which the Mth row and the first row are selected in each unit period U, for example, a predetermined potential (for example, a potential corresponding to a halftone) is selected in the selection period H in which the first row and the Mth row are selected. The gradation potential X [n] is supplied to each signal line 34.

  As described above, in the first embodiment, the common gradation potential X is supplied to the four pixels PIX belonging to the block designated in each unit period U (U1, U2). In the following, for each pixel PIX, the image signal G (right eye image GR, left eye image GL) in the unit period U1 of each display period P (right eye display period PR and left eye display period PL). Is designated as the first set gradation, and the gradation designated by the image signal G (right eye image GR, left eye image GL) in the unit period U2 may be referred to as the second set gradation. .

  As understood from the above description, in the unit period U1 of the right-eye display period PR, the left-eye image GL displayed in the immediately previous left-eye display period PL is displayed for each first set (every two rows). The right-eye image GR is sequentially updated to the right-eye image GR, and in the unit period U1 of the left-eye display period PL, the right-eye image GR displayed in the immediately previous right-eye display period PR is sequentially displayed for each first set. Updated to the image GL for use. That is, the right eye image GR and the left eye image GL are mixed in the unit period U1 of each display period P.

  The eyeglass control circuit 144 of the control circuit 14 in FIG. 1 synchronizes each state (open state / closed state) of the right eye shutter 22 and the left eye shutter 24 of the stereoscopic eyeglasses 20 with the operation of the electro-optical panel 12. And control. Specifically, as shown in FIG. 3, the glasses control circuit 144 closes both the right-eye shutter 22 and the left-eye shutter 24 in the unit period U1 of each display period P (PR, PL). Control. Further, the glasses control circuit 144 controls the right-eye shutter 22 to the open state and the left-eye shutter 24 to the closed state during the unit period U2 of the right-eye display period PR, and controls the left-eye display period PL. In the unit period U2, the left-eye shutter 24 is controlled to be in an open state and the right-eye shutter 22 is controlled to be in a closed state.

  Therefore, the right-eye image GR displayed in the unit period U2 of the right-eye display period PR passes through the right-eye shutter 22 and reaches the observer's right eye and is blocked by the left-eye shutter 24. On the other hand, the left-eye image GL displayed in the unit period U2 of the left-eye display period PL passes through the left-eye shutter 24 and reaches the left eye of the observer and is blocked by the right-eye shutter 22. By viewing the right-eye image GR that has passed through the right-eye shutter 22 with the right eye and the left-eye image GL that has passed through the left-eye shutter 24 with the left eye, the observer can see a stereoscopic effect on the display image. Perceive.

  As described above, the right-eye image GR and the left-eye image GL are mixed in the unit period U1 of each display period P. However, as described with reference to FIG. 3, the right eye is displayed in the unit period U1 of each display period P. Since both the shutter 22 for the left eye and the shutter 24 for the left eye are maintained in the closed state, the mixture (crosstalk) of the image for the right eye GR and the image for the left eye GL is not perceived by the observer. That is, since the right-eye image GR and the left-eye image GL are reliably separated into the right eye and the left eye, the observer can perceive a clear stereoscopic effect.

In each of the unit period U1 and unit period U2 of each display period P, an image (right-eye image GR, left-eye image) in which the x-direction and y-direction resolutions of the original display image indicated by the display data V are each halved. Image GL) is displayed.
However, in the unit period U1 in the right-eye display period PR, the right-eye image GR displayed for each first set according to the gradation GR [2p-1] [2q-1] In the period U2, images are sequentially updated to be displayed for each second group according to the gradation GR [2p] [2q]. That is, in the unit period U2 in the right-eye display period PR, the right-eye image GR displayed in the unit period U1 and the right-eye image GR displayed in the unit period U2 are mixed. The same applies to the display period PL for the left eye. Therefore, there is an advantage that a decrease in the resolution of the display image in each unit period U is hardly perceived by the observer.

  Here, an image actually perceived by the observer when the image displayed in the unit period U1 and the image displayed in the unit period U2 coexist will be described with reference to FIGS. 6 and 7 are, for convenience of explanation, among the plurality of pixels PIX arranged in a matrix of vertical M rows × horizontal N columns, the first column to the eighth row, the vertical row 8 and the first column. To 64 pixels PIX in 8 rows by 8 rows.

FIG. 6 is an explanatory diagram showing the relationship between the display data V supplied from the external circuit and the image signal G generated by the display control circuit 142. In the following, the case where the display data VR for the right eye is supplied to the display control circuit 142 and the display control circuit 142 outputs the image signal G of the image for the right eye GR will be described as an example. The same applies to the case where the left-eye display data VL is supplied to the display control circuit 142 and the display control circuit 142 outputs the image signal G of the left-eye image GL.
FIG. 6 (A) is a description in which the size of the gradation VR [m] [n] specified by the display data V (right-eye display data VR) supplied from the external circuit for each pixel PIX is expressed by shading. FIG. In this example, when the gradation specified by the display data V is the maximum gradation, the pixel PIX is expressed in white, and when the gradation is the minimum gradation, the pixel PIX is expressed in black, and the maximum gradation and the minimum gradation. The pixel PIX is represented by an intermediate color between white and black (for example, gray). In this example, the display data VR for the right eye has gradations VR [6] [3], VR [5] [4], VR [4] [5], and VR [3] [6] with the minimum gradation ( The gradation VR other than these four is set to the maximum gradation (represented in white in the figure).

  6B shows that when the right-eye display data VR shown in FIG. 6A is supplied from an external circuit, the image signal G of the right-eye image GR is designated to each pixel PIX in the unit period U1. FIG. 6C shows the size of the gradation (first setting gradation), and the gradation (second setting gradation) designated by the image signal G of the right eye image GR for each pixel PIX in the unit period U2. It is explanatory drawing showing the magnitude | size of (). 6 (B) and 6 (C), as in FIG. 6 (A), the gray scale level designated by the image signal G for each pixel PIX is represented by shading.

As shown in FIG. 6B, in the unit period U1, four pixels PIX belonging to the block BL [5] [3] having the pixel PIX in the fifth row and third column as the reference pixel are used for the right eye. The gradation GR [5] [3] specified by the image GR includes gradations VR [5] [4] and VR [6] [3] which are minimum gradations and gradation VR [5] which is the maximum gradation. ] [3] and VR [4] [4] are averages, so that the intermediate gradation (gray in the figure) is obtained. Similarly, the gradation GR [3] [5] designated by the right-eye image GR for the four pixels PIX belonging to the block BL [3] [5] is also an intermediate gradation (gray in the figure). . Other blocks (BL [1] [1], BL [1] [3], BL [1] [5], BL [1] [7], BL [3] [1], BL [3] [3], BL [3] [7], BL [5] [1], BL [5] [5], BL [5] [7], BL [7] [1], BL [7] [3 ], BL [7] [5], BL [7] [7]), the right-eye image GR specifies the maximum gradation.
As shown in FIG. 6C, the gradation GR [4] [4] specified by the right-eye image GR for the four pixels PIX belonging to the block BL [4] [4] in the unit period U2. Are the gradations VR [5] [4] and VR [4] [5] which are the minimum gradations and the gradations VR [4] [4] and VR [5] [5] which are the maximum gradations. Because it is average
Intermediate gradation (gray in the figure). The gradation GR [6] [2] designated by the right-eye image GR for the four pixels PIX belonging to the block BL [6] [2] is the gradation VR [6] which is the minimum gradation. [3],
Since it is the average of the maximum gradations VR [6] [2], VR [7] [2], VR [7] [3], the gradation between the intermediate gradation and the maximum gradation ( In the figure, it is an intermediate color between gray and white). Similarly, the gradation GR [2] [6] designated by the right-eye image GR for the four pixels PIX belonging to the block BL [2] [6] is also between the intermediate gradation and the maximum gradation. (The intermediate color between gray and white in the figure). As shown in FIG. 6C, the right-eye image GR specifies the maximum gradation for the other blocks.

In the unit period U2, the observer perceives an image in which the right eye image GR displayed in the unit period U1 and the right eye image GR displayed in the unit period U2 are mixed.
FIG. 7 is an explanatory diagram showing gradations actually perceived by the observer in the unit period U2 when the display data V shown in FIG. 6A is supplied from an external circuit. For example, as shown in FIG. 6B, the pixel PIX located in the sixth row and the fourth column has a gradation GR [5] [3] (the first gradation) that is an intermediate gradation (gray in the drawing) in the unit period U1. The gradation potential X [n] corresponding to one set gradation) is supplied, and as shown in FIG. 6C, the gradation GR [6] [, which is the maximum gradation (gray in the figure) in the unit period U2. 4] is supplied with a gradation potential X [n] corresponding to (second set gradation). Therefore, as shown in FIG. 7, the pixel PIX located in the sixth row and the fourth column displays a gradation between the intermediate gradation and the maximum gradation (gray and white intermediate color in the figure). Perceived by the observer.

Strictly speaking, the gradation of the pixel PIX perceived by the observer is not limited to the first setting gradation and the second setting gradation specified for the pixel PIX, but at the position of the pixel PIX in the pixel PIX. Determined based on.
Specifically, the period in which the pixel PIX located in the m-th row displays the first set gradation designated in the unit period U1 and the unit period U2 overlap (that is, the pixel in the unit period U2 The period of time during which PIX displays the first set gradation) is the time length s1 [m], and the period during which the pixel PIX displays the second set gradation specified in the unit period U2 and the unit period U2 A time length of an overlapping period (that is, a period in which the pixel PIX displays the second set gradation in the unit period U2) is a time length s2 [m]. At this time, the pixel PIX is perceived by the observer as displaying a gradation corresponding to a weighted average of the first set gradation and the second set gradation with the time length s1 and the time length s2 as weights. The
The time length s1 [m] is shortened when the pixel PIX is located above the pixel unit 30 (negative side in the Y direction). In this case, the pixel PIX is perceived by the observer as displaying a gradation closer to the first set gradation than the second set gradation.

  In the first embodiment described above, the scanning line 32 is selected in units of two in each unit period U, and the gradation potential X [n] is supplied to each pixel PIX. Therefore, when compared with a configuration in which the scanning lines 32 are sequentially selected in units of one row for each selection period H in each display period P and the gradation potential X [n] is supplied to each pixel PIX, the right eye image GR is compared. And the left eye image GL are mixed (that is, the period during which both the right eye shutter 22 and the left eye shutter 24 should be kept closed) is shortened. That is, a sufficient length of time during which the right eye shutter 22 or the left eye shutter 24 can be kept open during the display period P is secured. Therefore, it is possible to improve the brightness of the display image recognized by the observer.

  In the first embodiment, the scanning line 32 is selected in units of two in each of the unit period U1 and the unit period U2 of each display period P, and the gradation potential X [n] is supplied to each pixel PIX. In each selection period H, a common gradation potential X [n] is simultaneously supplied to two adjacent signal lines 34. Accordingly, the stereoscopic display is realized while suppressing the operation speed of the display control circuit 142 and the drive circuit 40 and the transfer speed of the display data V and the image signal G to about half of the configuration in which the display image is updated with the display period P as a cycle. it can. That is, the electro-optical device 10 according to the first embodiment has an advantage that the circuit scale and manufacturing cost of the drive circuit can be reduced.

  In the first embodiment, as shown in FIG. 3, the gradation potential X [n] corresponding to the gradation GR [2p-1] [2q-1] specified by the right-eye image GR is set in the control period. The positive polarity is set in the unit period U1 of the right eye display period PR at T1, and the negative polarity is set in the unit period U1 of the right eye display period PR in the control period T2. The gradation GR [2p] [2q] in the unit period U2 of the display period PR for the right eye, the gradation GL [2p-1] [2q-1] in the unit period U1 of the display period PL for the left eye, and the left eye Similarly, for the gradation GL [2p] [2q] in the unit period U2 of the display period PL, the time length for setting the gradation potential X [n] to the positive polarity and the time length for setting the negative polarity are set. Equalized. Therefore, there is an advantage that application of a direct current component to the liquid crystal element CL can be suppressed (deterioration of the liquid crystal element CL can be suppressed).

  In the first embodiment, as described above, in the unit period U2 in the right eye display period PR, the image displayed in the unit period U1 and the image displayed in the unit period U2 are mixed. The same applies to the display period PL for the left eye. Therefore, there is an advantage that a decrease in the resolution of the display image in each unit period U is hardly perceived by the observer.

  By the way, as an electronic device that displays a stereoscopic image that makes the observer perceive a stereoscopic effect based on the display data V (display data VR for the right eye, display data VL for the left eye), the scanning lines 32 are provided in units of two. Select and supply the gradation specified by the display data V to one pixel PIX among the two pixels PIX adjacent to each other in the y direction in the two rows selected at the same time. Thus, a configuration (hereinafter referred to as “comparative 1”) in which the image indicated by the right eye display data VR and the image indicated by the left eye display data VL are alternately displayed in a time-division manner can be assumed. . Hereinafter, in order to describe the effect of the first embodiment in detail, the display operation of the electro-optical device according to the comparative example 1 will be described with reference to FIG.

As shown in the part (R1) of FIG. 8, as shown in FIG. 8, among the unit periods U1 of the right eye display period PR in each control period T (T1, T2), the second (2p- In the selection period H in which the two scanning lines 32 in the 1) th row and the (2p) th row are selected, the signal line drive circuit 44 receives the right eye display data VR in each pixel PIX in the (2p-1) th row. The gradation potentials X [1] to X [N] corresponding to the gradations VR [2p-1] [1] to VR [2p-1] [N] specified for the N signal lines 34, respectively. Supply. Therefore, among the pixels PIX in the (2p-1) -th row and the (2p) -th row constituting the first set, the two pixels PIX (selected pixels) in the n-th column include the (2p-1) -th row. A gradation potential X [n] corresponding to the gradation VR [2p-1] [N] specified by the right-eye display data VR is supplied to the pixel PIX in the n-th column.
Further, as shown in the part (R2) of FIG. 8, among the unit periods U2 of the display period PR for the right eye within each control period T (T1, T2), the (2p) th row and the second row constituting the second set. In the selection period H in which the two scanning lines 32 in the (2p + 1) -th row are selected, the signal line driving circuit 44 determines the gradation specified by the right-eye display data VR for each pixel PIX in the (2p) -th row. The gradation potentials X [1] to X [N] corresponding to VR [2p] [1] to VR [2p] [N] are supplied to each of the N signal lines 34. Therefore, the two pixels PIX (selected pixels) in the n-th column among the pixels PIX in the (2p) -th row and the (2p + 1) -th row constituting the second set include the (2p) -th row in the n-th column. A gradation potential X [n] corresponding to the gradation VR [2p] [N] designated by the right-eye display data VR is supplied to the pixels PIX in the column.
In the left eye display period PL of each control period T (T1, T2), the same operation as in the right eye display period PR is executed. That is, in each selection period H within the unit period U1 of the display period PL for the left eye, as shown in the part (L1) of FIG. 8, the first composed of the (2p-1) th row and the (2p) th row. Among the pixels PIX of the set, the two pixels PIX (selected pixels) in the n-th column include the gradation VL [specified by the left-eye display data VL for the pixel PIX in the (2p-1) -th row and the n-th column. 2p-1] [N] is supplied with the gradation potential X [n]. Further, in each selection period H within the unit period U2 of the display period PL for the left eye, as shown in the part (L2) of FIG. 8, the second composed of the (2p) th row and the (2p + 1) th row. Among the pixels PIX of the set, the two pixels PIX (selected pixels) in the n-th column include the gradation VL [2p] specified by the left-eye display data VL for the pixel PIX in the (2p) -th row and the n-th column. A gradation potential X [n] corresponding to [N] is supplied.

FIG. 9 is an explanatory diagram showing the relationship between the gradation specified by the display data V supplied to the electro-optical device according to the comparative example 1 and the image perceived by the observer. FIG. 9A is an explanation in which the magnitude of the gradation VR [m] [n] designated by the display data V (right-eye display data VR) supplied from the external circuit for each pixel PIX is expressed by shading. FIG. The display data V shown in FIG. 9A is the same as the display data V shown in FIG. Here, the case where the display data V is the right-eye display data VR will be described as an example. However, the following description also applies to the case where the display data V is the left-eye display data VL. FIG. 9B shows the magnitude of the gradation VR [m] [n] specified by the right eye display data VR for each pixel PIX in the unit period U1, and FIG. 9C shows the right eye in the unit period U2. The display data VR for use represents the size of the gradation VR [m] [n] specified for each pixel PIX.
As shown in FIG. 9B, in the unit period U1, for example, the two pixels PIX in the fifth row and the fourth column and the sixth row and the fourth column correspond to the gradation VR [5] [4]. The gradation potential X [n] is supplied. Here, the gradation VR [5] [4] is the minimum gradation (black in the figure). On the other hand, as shown in FIG. 9C, in the unit period U2, the two pixels PIX in the sixth row, fourth column and the seventh row, fourth column correspond to the gradation VR [6] [4]. The gradation potential X [n] is supplied. Here, the gradation VR [6] [4] is the maximum gradation (white in the figure).
At this time, in the pixel PIX in the sixth row and the fourth column marked with “◯” in FIGS. 9B and 9C, the minimum gradation (black) is designated in the unit period U1, and in the unit period U2 The maximum gradation (white) is specified. That is, the pixel PIX in the sixth row and the fourth column displays the minimum gradation in a certain period (that is, the period corresponding to the time length s1) in the unit period U2, and the period until the subsequent unit period U2 ends. The maximum gradation is displayed in (that is, a period corresponding to the time length s2). That is, the gradation displayed by the pixel PIX in the sixth row and the fourth column changes rapidly from the minimum gradation to the maximum gradation in the unit period U2.

  Thus, when the gradation displayed by the pixel PIX changes in the unit period U2, the observer may perceive the change in gradation displayed by the pixel PIX as “flicker”. In particular, as in the example shown in FIG. 9, when a certain pixel PIX has a large difference between the gradation specified in the unit period U1 and the gradation specified in the unit period U2, the gradation displayed by the pixel PIX is Since it changes greatly in the unit period U2, there is a high possibility that the observer perceives the change in the gradation of the pixel PIX as “flicker”. In addition, when the video represented by the display data V is a still image, the change in gradation of each pixel PIX shown in FIGS. 9B and 9C is continuously repeated every control period T, so that the observation is performed. There is a high possibility that a person perceives a change in gradation of each pixel PIX as “flicker”.

On the other hand, in the first embodiment, the signal line drive circuit 44 displays the display data V for the four pixels PIX belonging to the block BL specified in each unit period U (U1, U2). A gradation potential X corresponding to the gradation calculated as the average of gradations designated for each of the pixels PIX is supplied in common. Thereby, in the first embodiment, it is possible to suppress the amount of change in the gradation of each pixel PIX in the unit period U2 to be smaller than that in the comparative example 1.
For example, when the display data V shown in FIG. 6 (A) is supplied from an external circuit, as shown in FIGS. 9 (B) and 9 (C), the pixel PIX in the sixth row and the fourth column is shown in FIG. While the gradation greatly changes from the minimum gradation (black in the figure) to the maximum gradation (white in the figure), in the first embodiment, as shown in FIGS. 6 (B) and (C). The gradation of the pixel PIX in the sixth row and fourth column only changes from the intermediate gradation (gray) to the maximum gradation (white).
That is, in the first embodiment, a gradation (first set gradation) in which each pixel PIX is designated in the unit period U1, and a gradation (second set gradation) in which each pixel PIX is designated in the unit period U2. By suppressing the amount of change to be small, it is possible to reduce the possibility that the observer perceives the change in gradation of each pixel PIX as “flickering”.

  In the first embodiment, in each selection period H, the common gradation potential X [n] is simultaneously supplied to the two signal lines 34 adjacent to each other. Accordingly, it is possible to realize stereoscopic display while suppressing the operation speeds of the display control circuit 142 and the drive circuit 40 to about half of the proportional 1. That is, the electro-optical device 10 according to the first embodiment has an advantage that the circuit scale and manufacturing cost of the drive circuit can be reduced.

Second Embodiment
In the first embodiment, each display period P (PR, PL) is divided into two unit periods U (U1, U2) having the same time length, and each display period P (PR, PL) is divided into unit periods U1. In order to control both the right-eye shutter 22 and the left-eye shutter 24 in the closed state, the period during which the observer can actually see the image is in each of the right-eye display period PR and the left-eye display period PL. It is limited to the unit period U2 (that is, about half of each display period P).
The second embodiment is a form aimed at solving the above problems that may occur in the first embodiment. In addition, about the element which an effect | action and a function are equivalent to 1st Embodiment in each form illustrated below, each reference detailed in the above description is diverted and each detailed description is abbreviate | omitted suitably.

FIG. 10 is an explanatory diagram of the operation of the electro-optical device 10 according to the second embodiment. The operation period of the electro-optical device 10 in the second embodiment is divided into a plurality of control periods Ta, and each control period Ta has two display periods Pa (a right-eye display period Pra, a left-eye display). Period PLa). Each display period Pa is divided into four unit periods U including two unit periods U1 and two unit periods U2. Specifically, each display period Pa (PRa, PLa) is divided into four unit periods U: a unit period U1, a unit period U2, a unit period U1, and a unit period U2. Here, the unit period U1 corresponding to the first unit period U among the four unit periods U is referred to as “first unit period U1”, and the unit period U2 corresponding to the second unit period U is referred to as “first unit period U1”. The unit period U1 corresponding to the third unit period U is referred to as the “unit period U2,” and the unit period U2 corresponding to the fourth unit period U is referred to as the “last unit period U2.” Called. That is, the control period Ta according to the second embodiment has a time length twice as long as the control period T according to the first embodiment.
In the electro-optical device 10 according to the second embodiment, in each of the two unit periods U1 included in each display period Pa, as in the first embodiment, each of the plurality of pixels PIX located in odd rows and odd columns is used as a reference pixel. A plurality of blocks BL corresponding to each of the plurality of reference pixels are designated, and each of the plurality of pixels PIX located in even rows and even columns is used as a reference pixel in two unit periods U2 included in each display period Pa. A plurality of blocks BL corresponding to each of the plurality of reference pixels are designated. In the second embodiment, the polarity of the gradation potential X [n] is set to positive (+) in the first unit period U1 and the last unit period U2 in each display period Pa of each control period Ta. Then, in the first unit period U2 and the last unit period U1, the polarity of the gradation potential X [n] is set to negative polarity (-). In the first embodiment, the polarity of the gradation potential X [n] is not inverted every control period T as in the first embodiment.

  In the second embodiment, as shown in FIG. 10, the glasses control circuit 144 performs both the right-eye shutter 22 and the left-eye shutter 24 in the first unit period U1 of each display period Pa (PRa, PLa). Control to the closed state. Further, the glasses control circuit 144 controls the right-eye shutter 22 to be open and controls the left-eye for the period from the start of the first unit period U2 to the end of the last unit period U2 of the right-eye display period Pra. The shutter 24 is controlled to be closed, and the left-eye shutter 24 is controlled to be open and the right eye during the period from the start of the first unit period U2 to the end of the last unit period U2 of the left-eye display period PLa. The shutter 22 is controlled to be closed.

Thus, in the second embodiment, among the four unit periods U constituting each display period Pa (PRa, PLa), the right unit is used for the first unit period U (that is, the first unit period U1). Both the shutter 22 and the left-eye shutter 24 are controlled to be closed. Therefore, in the second embodiment, the mixture (crosstalk) of the right-eye image GR and the left-eye image GL is suppressed, and the right-eye shutter 22 and the left-eye image are displayed for about half of each display period P. Compared with the first embodiment in which both shutters 24 are controlled to be closed, the brightness of the display image recognized by the observer can be improved.
In the second embodiment, as shown in FIG. 10, the gradation potential X [n] corresponding to the gradation GR [2p-1] [2q-1] specified by the right-eye image GR is set to the right eye. The first unit period U1 of the display period PRa is set to positive polarity, and the last unit period U1 is set to negative polarity. Further, the gradation potential X [n] corresponding to the gradation GR [2p] [2q] designated by the right-eye image GR is set to be positive in the first unit period U1 of the right-eye display period Pra. In the last unit period U1, the negative polarity is set. Gradation GR [2p] [2q] in each unit period U2 of the right eye display period Pra, gradation GL [2p-1] [2q-1] in each unit period U1 of the left eye display period PLa, and Similarly, for the gradation GL [2p] [2q] in each unit period U2 of the left-eye display period PLa, the time length for setting the gradation potential X [n] to be positive and the time for setting to the negative polarity The length is equalized. Therefore, there is an advantage that application of a direct current component to the liquid crystal element CL can be suppressed (deterioration of the liquid crystal element CL can be suppressed).
In the second embodiment, as in the first embodiment, the signal line driving circuit 44 displays the four pixels PIX belonging to the block BL designated in each unit period U (U1, U2). Since the data V supplies in common the gradation potential X corresponding to the gradation calculated as the average of the gradations designated to each of the four pixels PIX, each pixel PIX is designated in the unit period U1. Observe the change in gradation of each pixel PIX as “flicker” by keeping the amount of change between the tone (first set gradation) and the gradation (second set gradation) specified in the unit period U2 small. This has the advantage that the possibility of being perceived by a person can be reduced.

<Modification>
Each of the above forms can be variously modified. Specific modifications are exemplified below. Two or more aspects arbitrarily selected from the following examples can be appropriately combined within a range that does not contradict each other.

(1) Modification 1
In the first embodiment described above, the right-eye shutter 22 is changed from the closed state to the open state at the end point of the unit period U1 in the right-eye display period PR, but the right-eye shutter 22 is opened from the closed state. The timing for changing to the state is changed as appropriate. For example, in the configuration in which the right-eye shutter 22 is changed to the open state before the end point of the unit period U1 of the right-eye display period PR, the right-eye image GR and the left-eye image GL are mixed in the unit period U1. Although it is slightly perceived by the observer, the brightness of the display image can be improved. On the other hand, in the configuration in which the right-eye shutter 22 is changed to the open state after the end point of the unit period U1 of the right-eye display period PR, the brightness of the display image is lowered, but the right-eye image GR and the left-eye image are displayed. It is possible to reliably prevent the viewer from perceiving the mixture with the image GL.
Similarly, a configuration in which the timing for changing the right-eye shutter 22 from the open state to the closed state is set before the end point of the unit period U2 of the right-eye display period PR (the brightness of the display image decreases, but the right-eye image GR and the left-eye image GL are prevented from being mixed) and a configuration set after the end point of the unit period U2 of the right-eye display period PR (for the right eye within the unit period U1 of the left-eye display period PL) (Slight mixing of the image GR and the left eye image GL is perceived, but the brightness of the display image is improved). In addition, the opening and closing time when the mixture of the right-eye image GR and the left-eye image GL is not easily perceived by the observer is determined by the response characteristics of the right-eye shutter 22 and the left-eye shutter 24 and the electro-optical panel 12 (liquid crystal element). It also depends on the relationship with the response characteristic of CL). Accordingly, when the right-eye shutter 22 is changed from the closed state to the open state, or when the right-eye shutter 22 is changed from the open state to the closed state, the observer perceives the mixture of the right-eye image GR and the left-eye image GL. It is selected in consideration of various factors such as the priority (balance) between preventing this and ensuring the brightness of the display image and the relationship between the response characteristics of the stereoscopic glasses 20 and the response characteristics of the electro-optical panel 12. In the above description, the right-eye shutter 22 is referred to. However, the same situation applies to the opening / closing timing of the left-eye shutter 24.

  As understood from the above description, the period during which the right-eye shutter 22 is controlled to be in the open state includes a period including at least a part of the unit period U2 in the right-eye display period PR (whether or not the unit period U1 is included). Is not included). Similarly, the period during which the left-eye shutter 24 is controlled to be opened is included as a period including at least a part of the unit period U2 in the left-eye display period PL (whether or not the unit period U1 is included). The The period during which both the right-eye shutter 22 and the left-eye shutter 24 are controlled to be closed is included as at least a part of the unit period U1 in each display period P (PR, PL).

(2) Modification 2
In the first modification, the first embodiment is illustrated, but also in the second embodiment, the timing for opening and closing the right-eye shutter 22 and the left-eye shutter 24 is appropriately changed. For example, the period in which the right-eye shutter 22 is controlled to be in the open state includes at least a part of the period from the start of the first unit period U2 to the end of the last unit period U2 in the right-eye display period PRa. (It does not matter whether or not the first unit period U1 is included). Similarly, the period during which the left-eye shutter 24 is controlled to be in the open state includes at least a part of the period from the start of the first unit period U2 to the end of the last unit period U2 in the left-eye display period PLa. It is included as a period (regardless of whether or not the first unit period U1 is included). The period during which both the right-eye shutter 22 and the left-eye shutter 24 are controlled to be closed is included as at least a part of the first unit period U1 in each display period Pa (PRa, PLa). The

(3) Modification 3
In the electro-optical device 10 according to the above-described embodiment and the modified example, in the unit period U1 of each display period P (or Pa), each of the plurality of pixels PIX located in the odd rows and odd columns is used as a reference pixel. A plurality of blocks BL corresponding to each of the reference pixels are designated, and each of the plurality of pixels PIX located in even rows and even columns in the unit period U2 of each display period P (or Pa) is used as the reference pixel. Although a plurality of blocks BL corresponding to each of the reference pixels is designated, the present invention is not limited to such an embodiment, and even rows and even columns are displayed in the unit period U1 of each display period P (or Pa). A plurality of blocks P L corresponding to each of the plurality of reference pixels are designated with each of the plurality of pixels PIX positioned at
In the unit period U2 of each display period P (or Pa), each of a plurality of pixels PIX located in odd rows and odd columns is designated as a reference pixel, and a plurality of blocks BL corresponding to each of the plurality of reference pixels are designated. It may be.

(4) Modification 4
In the embodiment and the modification described above, the block BL specified by the electro-optical device 10 in the unit period U2 of each display period P (or Pa) is the block BL specified in the unit period U1 of each display period P (or Pa). On the other hand, the pixel is shifted by one pixel with respect to the x direction and the y direction. However, the present invention is not limited to such a mode, and 1 for at least one of the x direction and the y direction. The pixel may be shifted. For example, the block BL specified in the unit period U2 of each display period P (or Pa) is shifted by one pixel in the x direction from the block BL specified in the unit period U1 in each display period P (or Pa). It may be. Further, the block BL specified in the unit period U2 of each display period P (or Pa) is shifted by one pixel in the y direction with respect to the block BL specified in the unit period U1 in each display period P (or Pa). It may be.

(5) Modification 5
The electro-optical device 10 according to the embodiment and the modification described above has the gradation potential X [[ n] is defined, but the present invention is not limited to such an embodiment, and performs the operations shown in the equations (1) to (8) only when a predetermined condition is satisfied. There may be. For example, only when the difference between the maximum gradation and the minimum gradation among the gradations specified by the display data V for the four pixels PIX belonging to a certain block BL is larger than a predetermined threshold, the expression The calculations shown in (1) to (8) may be performed.

  More specifically, the maximum value among the gradations specified by the display data V for the four pixels PIX belonging to a certain block BL [m] [n] is the maximum display gradation Vmax [m] [n]. The minimum value is the minimum display gradation Vmin [m] [n], and the absolute value of the difference between the maximum display gradation Vmax and the minimum display gradation Vmin is the difference gradation ΔV [m] [n]. The display control circuit 142 and the drive circuit 40 each of the four pixels PIX belonging to the block BL [m] [n] if the difference gradation ΔV [m] [n] is larger than the predetermined threshold value α. For each of the four pixels PIX belonging to the block BL [m] [n], the gradation potential X corresponding to the gradation calculated as the average of the gradations specified by the display data V is common to each of the four pixels PIX. To supply. On the other hand, if the difference gradation ΔV [m] [n] is equal to or smaller than the predetermined threshold α, the pixel PIX at a predetermined position (for example, the block) among the four pixels PIX belonging to the block BL [m] [n]. The gradation potential X corresponding to the gradation designated by the display data V is applied to the block BL [m] [n] with respect to the pixel PIX of the m-th row and the n-th column, which is the reference pixel of BL [m] [n]. ] Is commonly supplied to each of the four pixels PIX belonging to.

  As described above, the electro-optical device 10 according to the modified example 5 has a maximum gradation and a minimum gradation among the gradations specified by the display data V for the four pixels PIX belonging to a certain block BL. When the difference is larger than a predetermined threshold value, the average of the gradations specified by the display data V for each of the four pixels PIX belonging to the block BL is expressed by equations (1) to (8). The gradation potential X corresponding to the calculated value is commonly supplied to the four pixels PIX. Therefore, when the calculations shown in the equations (1) to (8) are not performed, for example, the gradation specified by the display data V for the pixel PIX at a predetermined position among the four pixels PIX belonging to a certain block BL. As compared with the case where the gradation potential X corresponding to the pixel BL is always supplied in common to the four pixels PIX belonging to the block BL, the gradation (first setting floor) in which each pixel PIX is designated in the unit period U1. And the gradation (second set gradation) in which each pixel PIX is designated in the unit period U2 can be reduced. Thereby, it is possible to reduce the possibility that the observer visually recognizes “flicker”.

(6) Modification 6
In the embodiment and the modification described above, the four weighting factors w used in the calculation of the weighted average for calculating the image signal G from the display data V are set to the same value, but the present invention is limited to such an embodiment. Instead, each of the four weighting factors w may be set to a different value.
When the four weighting coefficients w used in the calculation of the weighted average for calculating the image signal G from the display data V are set to the same value, the electro-optical device 10 displays an image having a lower contrast than the original image indicated by the display data V. May be displayed. For example, as shown in FIG. 6A, when the image indicated by the display data V is an image displaying a white background and a black figure, if the four weighting factors w are set to the same value, the electro-optic The image displayed by the apparatus 10 displays in gray a figure that should be displayed as black.
The electro-optical device 10 according to the modified example 6 uses four weighting coefficients w in the weighted average calculation for calculating the gradation of the four pixels PIX belonging to the block BL to display data for each of the four pixels PIX. It is determined based on the relationship between the gradation specified by V and the gradation specified by the display data V for each of the predetermined number of pixels PIX including the four pixels PIX. That is, the electro-optical device 10 according to the modified example 6 uses the gradation of each block BL, the gradation of the four pixels PIX belonging to each block BL, and the levels of the plurality of pixels PIX existing around each block BL. Control based on the relationship with the key. Thereby, the electro-optical device 10 according to the modified example 6 can display a clear image close to the original display image indicated by the display data V.

A specific method for determining the four weighting factors w will be described with reference to FIG.
First, the display control circuit 142 determines the gradation specified by the display data V for each of a predetermined number of pixels ENV [m] [n] including four pixels PIX belonging to a certain block BL [m] [n]. Is calculated as an average gradation VAVE [m] [n]. The predetermined number of pixels ENV [m] [n] including the four pixels PIX belonging to the block BL [m] [n] may be appropriately determined so as to include the block BL [m] [n]. In this modified example, as shown in FIG. 11, a total of 16 pixels each consisting of four pixels belonging to the block BL [m] [n] and 12 pixels PIX surrounding the four pixels PIX. Let PIX be a predetermined number of pixels ENV [m] [n].
Next, the display control circuit 142 sets the maximum display gradation Vmax [m] among the gradations specified by the display data V for each of the four pixels PIX belonging to a certain block BL [m] [n]. ] [n], and the minimum value is the minimum display gradation Vmin [m] [n], the difference between the maximum display gradation Vmax [m] [n] and the average gradation VAVE [m] [n] The absolute value is calculated as the first differential gradation ΔV1 [m] [n], and the absolute value of the difference between the average gradation VAVE [m] [n] and the minimum display gradation Vmin [m] [n] is calculated. Calculated as a two-difference gradation ΔV2 [m] [n].
Then, when the first differential gradation ΔV1 [m] [n] is larger than the second differential gradation ΔV2 [m] [n], the display control circuit 142 displays the display among the four pixels PIX. The weighting coefficient w corresponding to the pixel PIX for which the data V designates the maximum display gradation Vmax [m] [n] is set to a larger value than the three weighting coefficients w corresponding to the other three pixels PIX. . For example, the weighting coefficient w corresponding to the pixel PIX for which the display data V designates the maximum display gradation Vmax [m] [n] is “2”, and the three weighting coefficients w corresponding to the other three pixels PIX are set. “1”.
Conversely, when the second differential gradation ΔV2 [m] [n] has a value greater than the first differential gradation ΔV1 [m] [n], the display control circuit 142 selects the four pixels PIX. The weighting coefficient w corresponding to the pixel PIX for which the display data V designates the minimum display gradation Vmin [m] [n] is set to a larger value than the three weighting coefficients w corresponding to the three pixels PIX. . For example, the weighting coefficient w corresponding to the pixel PIX for which the display data V designates the minimum display gradation Vmin [m] [n] is “2”, and the three weighting coefficients w corresponding to the other three pixels PIX are set. “1”.

As described above, according to the modification example 6, the display data V exists around the gradation designated by the four pixels PIX belonging to the block BL [m] [n] and around the block BL [m] [n]. If the gradation specified for each of the plurality of pixels PIX differs greatly, the gradation displayed by the block BL [m] [n] and the plurality of gradations present around the block BL [m] [n] Four weighting factors w are determined so that the gradation displayed by the pixel PIX is greatly different. As a result, the pixel PIX can display a gradation close to the gradation specified by the display data V.
For example, when the gradation indicated by the display data V shown in FIG. 6A is supplied from an external circuit, according to the electro-optical device 10 according to the modified example 6, as shown in FIG. The gradation difference between the gradation displayed by the four pixels PIX belonging to BL [5] [3] in the unit period U1 and the gradation displayed by the pixels PIX around the four pixels PIX is shown in FIG. Compared to the case of the first embodiment shown in FIG. The same applies to the four pixels PIX belonging to the block BL [3] [5]. Further, as shown in FIG. 12B, the gradation displayed by the four pixels PIX belonging to the block BL [4] [4] in the unit period U2 and the pixels PIX around the four pixels PIX are determined. The gradation difference from the gradation to be displayed is larger than that in the first embodiment shown in FIG. The same applies to the pixels PIX belonging to the blocks BL [6] [2] and BL [2] [6]. Therefore, as shown in FIG. 12C, the observer is closer to the gradation (FIG. 6A) that represents the original image indicated by the display data V than in the case of the first embodiment (FIG. 7). The key is perceived as being displayed on each pixel PIX.

(7) Modification 7
In the embodiment and the modification described above, the average value of the gradation specified by the display data V is calculated for each of the four pixels PIX belonging to the block BL, and the average value corresponding to the gradation calculated as the average value is calculated. The gradation potential X is supplied to each of the four pixels PIX.
The present invention is not limited to such an embodiment, and the gradation potential X corresponding to the gradation obtained by multiplying the average value by a coefficient (gradation control coefficient ρ) It may be supplied in common to each of the pixels PIX. That is, the gradation specified by the image signal G for the four pixels PIX may be set to a value obtained by multiplying the average value by the gradation control coefficient ρ.
At this time, the gradation control coefficient ρ corresponding to a certain block BL is applied to the gradation designated by the display data V for each of the four pixels PIX belonging to the block BL and the periphery of the four pixels PIX. It may be determined based on the relationship between the predetermined number of pixels PIX including a plurality of existing pixels PIX and the gradation specified by the display data V. Accordingly, the electro-optical device 10 according to the modified example 7 uses the gradation of each block BL as the gradation of the four pixels PIX belonging to each block BL and the plurality of pixels PIX existing around each block BL. Control based on the relationship with gradation. Thereby, the electro-optical device 10 according to the modified example 7 can display a clear image close to the original display image indicated by the display data V.

Hereinafter, a method for determining the gradation control coefficient ρ and a method for calculating the gradation designated by the image signal G for the block BL will be described in detail. Hereinafter, the gradation control coefficient ρ for determining the gradations of the four pixels PIX belonging to the block BL [m] [n] is expressed as a gradation control coefficient ρ [m] [n].
First, the display control circuit 142 calculates an average value of gradations specified by the display data V for each of four pixels PIX belonging to a certain block BL [m] [n] as an average gradation BAVE [m] [n. ] (First average gradation).
In addition, the display control circuit 142 has a gradation specified by the display data V for each of a predetermined number of pixels ENV [m] [n] including four pixels PIX belonging to a certain block BL [m] [n]. Is calculated as an average gradation VAVE [m] [n] (second average gradation). The predetermined number of pixels ENV [m] [n] including the four pixels PIX belonging to the block BL [m] [n] may be appropriately determined so as to include the block BL [m] [n]. In this modified example, as in the modified example 6, a total of 16 pixels including four pixels belonging to the block BL [m] [n] and 12 pixels PIX surrounding the four pixels PIX. Let PIX be a predetermined number of pixels ENV [m] [n] (see FIG. 11).
Next, the display control circuit 142 sets the maximum display gradation Vmax [m] among the gradations specified by the display data V for each of the four pixels PIX belonging to a certain block BL [m] [n]. ] [n], and the minimum value is the minimum display gradation Vmin [m] [n], the difference between the maximum display gradation Vmax [m] [n] and the average gradation VAVE [m] [n] The absolute value is calculated as the first differential gradation ΔV1 [m] [n], and the absolute value of the difference between the average gradation VAVE [m] [n] and the minimum display gradation Vmin [m] [n] is calculated. Calculated as a two-difference gradation ΔV2 [m] [n].
The display control circuit 142 then determines the gradation control coefficient ρ [m] [n when the first difference gradation ΔV1 [m] [n] is larger than the second difference gradation ΔV2 [m] [n]. ] Is set to a value larger than “1”. Conversely, the display control circuit 142 determines that the gradation control coefficient ρ [m] when the second difference gradation ΔV2 [m] [n] is larger than the first difference gradation ΔV1 [m] [n]. [n] is set to a value larger than “0” and smaller than “1”.
The display control circuit 142 has gradations (gradation GR [m] [n], gradation GL [m] [] that the image signal G designates for the four pixels PIX belonging to the block BL [m] [n]. n]) is set to a gradation obtained by multiplying the gradation control coefficient ρ [m] [n] and the average gradation BAVE [m] [n]. That is, the four pixels PIX belonging to the block BL [m] [n] are obtained by multiplying the gradation control coefficient ρ [m] [n] and the average gradation BAVE [m] [n]. A gradation potential X corresponding to the tone is supplied in common.
As described above, the electro-optical device 10 according to the modified example 7 includes the gradations of the four pixels PIX belonging to the block BL, the gradations specified by the display data V for each of the four pixels PIX, This is determined based on the gradation specified by the display data V for a predetermined number of pixels PIX including the four pixels PIX. Thereby, the electro-optical device 10 according to the modified example 7 can display a clear image close to the original display image indicated by the display data V.

(8) Modification 8
In the embodiment and the modification described above, the signal line drive circuit 44 simultaneously supplies the same gradation potential X to the two signal lines 34 corresponding to the block BL designated in each unit period U. However, the present invention is not limited to such an embodiment, and the gradation potentials X [1] to X [N] are sequentially supplied to each of the N signal lines 34. There may be. In this case, in each selection period H of the unit period U1, the display control circuit 142 supplies the gradation potential X that the signal line driving circuit 44 supplies to one signal line 34 in the odd-numbered column ((2q-1) th column). The image signal G is determined so that [2q-1] and the gradation potential X [2q] supplied to one signal line 34 in the even-numbered column ((2q) -th column) are equal, and each unit period U2 In the selection period H, the signal line driving circuit 44 supplies the gradation potential X [2q] supplied to one signal line 34 in the even number column ((2q) th column) and the odd number column ((2q + 1) th row). The image signal G may be determined so that the gradation potential X [2q + 1] supplied to one signal line 34 is equal.

(9) Modification 9
In Embodiment 2 described above, the time length of the control period Ta is set to twice the time length of the control period T in the first embodiment, but the present invention is not limited to this, and the first embodiment It may be equal to the time length of the control period T in the embodiment. In this case, the time length of the four unit periods constituting each display period Pa may be half the time length of the unit period U.
When the polarity of the gradation potential X [n] in each unit period U is inverted every control period T as in the first embodiment, two pieces sandwiching the boundary of each control period T as shown in FIG. The voltage applied to the liquid crystal element CL is maintained in the same polarity over the time length τ of the unit period U. The longer the period of applying the voltage of the same polarity to the liquid crystal element CL, the easier it is for the observer to perceive the display gradation variation (ie, “flicker”) due to the polarity difference of the gradation potential X [n]. Therefore, in the configuration in which the polarity of the gradation potential X [n] is maintained at the same polarity in a long cycle of two unit periods U as in the first embodiment, there is a problem that flicker is easily perceived by the observer. Arise.
On the other hand, in the electro-optical device 10 according to the modification 9, the time length τ2 in FIG. 10 can be reduced to half the time length τ in FIG. 3, so that the occurrence of flicker can be suppressed. .
The electro-optical device 10 according to the modification 9 can supply the gradation potential X to the four pixels at the same time. There is also an advantage that the display image can be maintained in the same manner as the configuration for updating the display image. That is, this modification has an advantage that stereoscopic display can be realized with a drive circuit having the same operation speed as that of the drive circuit used for the planar image (that is, the circuit scale and manufacturing cost of the drive circuit can be reduced). In addition, there is an advantage that generation of flicker can be suppressed.

(10) Modification 10
The electro-optical element is not limited to the liquid crystal element CL. For example, an electrophoretic element can be used as an electro-optical element. That is, the potential optical element is included as a display element whose optical characteristics (for example, transmittance) change according to an electrical action (for example, application of voltage).

(11) Modification 11
In the embodiment and the modification described above, the first set and the second set selected by the scanning line driving circuit 42 with the pixels PIX belonging to the block BL as four pixels of 2 rows × 2 rows are the scanning lines 32. In the example described above, the scanning line driving circuit 42 selects the pixel PIX belonging to the block BL in units of 9 pixels of 3 rows × 3 rows. The set and the second set may be shifted in the y direction by one or two scanning lines 32. The first and second sets selected by the scanning line driving circuit 42 with the pixel PIX belonging to the block BL in units of 16 pixels of 4 vertical rows and 4 horizontal rows are 1 to 3 scanning lines 32. It is also possible to make the relationship shifted in the y direction by any one minute. In addition, the pixels PIX belonging to the block BL can be set in units of 6 pixels of 2 vertical rows × 3 horizontal rows and 12 pixels of 3 vertical rows × 4 horizontal rows.

<Application example>
The electro-optical device 10 exemplified in the above embodiments can be used in various electronic apparatuses. 13 to 15 exemplify specific forms of electronic devices that employ the electro-optical device 10.

  FIG. 13 is a schematic diagram of a projection display device (three-plate projector) 4000 to which the electro-optical device 10 is applied. The projection display device 4000 includes three electro-optical devices 10 (10R, 10G, and 10B) corresponding to different display colors (red, green, and blue). The illumination optical system 4001 supplies the red component r of the light emitted from the illumination device (light source) 4002 to the electro-optical device 10R, the green component g to the electro-optical device 10G, and the blue component b to the electro-optical device 10B. To supply. Each electro-optical device 10 functions as a light modulator (light valve) that modulates each monochromatic light supplied from the illumination optical system 4001 according to a display image. The projection optical system 4003 synthesizes the emitted light from each electro-optical device 10 and projects it onto the projection surface 4004. The observer visually recognizes the stereoscopic image projected on the projection surface 4004 with the stereoscopic glasses 20 (not shown in FIG. 15).

  FIG. 14 is a perspective view of a portable personal computer that employs the electro-optical device 10. The personal computer 2000 includes an electro-optical device 10 that displays various images, and a main body 2010 on which a power switch 2001 and a keyboard 2002 are installed.

  FIG. 15 is a perspective view of a mobile phone to which the electro-optical device 10 is applied. The cellular phone 3000 includes a plurality of operation buttons 3001, scroll buttons 3002, and the electro-optical device 10 that displays various images. By operating the scroll button 3002, the screen displayed on the electro-optical device 10 is scrolled.

  Note that electronic devices to which the electro-optical device according to the present invention is applied include, in addition to the devices illustrated in FIGS. 13 to 15, personal digital assistants (PDAs), digital still cameras, televisions, video cameras, Car navigation devices, in-vehicle displays (instrument panels), electronic notebooks, electronic paper, calculators, word processors, workstations, videophones, POS terminals, printers, scanners, copiers, video players, devices with touch panels, etc. Can be mentioned.

  DESCRIPTION OF SYMBOLS 100 ... Stereoscopic display apparatus, 10 ... Electro-optical apparatus, 12 ... Electro-optical panel, 14 ... Control circuit, 142 ... Display control circuit, 144 ... Glasses control circuit, 20 ... Stereoscopic glasses, 22 ... Shutter for right eye, 24 ... Left eye shutter, 30 ... Pixel unit, PIX ... Pixel, CL ... Liquid crystal element, 32 ... Scanning line, 34 ... Signal line, 40 ... Drive circuit, 42 ... Scan line drive circuit, 44 ... Signal line drive circuit.

Claims (14)

An electro-optical device that alternately displays an image for the right eye and an image for the left eye for each display period,
A plurality of scanning lines composed of a plurality of first scanning lines and a plurality of second scanning lines arranged alternately;
A plurality of signal lines intersecting the plurality of scanning lines;
A plurality of pixels arranged corresponding to each intersection of the plurality of scanning lines and the plurality of signal lines;
In each of the right eye image display period and the left eye image display period,
In the first unit period of the display period, a first set of scanning lines including the first scanning line and the second scanning line adjacent to each other among the plurality of scanning lines is sequentially selected for each selection period. ,
In the second unit period after the elapse of the first unit period, the first scanning lines adjacent to each other in a combination shifted by one from the first set of scanning lines selected in the first unit period A first drive circuit that sequentially selects a second set of scan lines each consisting of a second scan line for each selection period;
Display data indicating a gradation to be displayed by each of the plurality of pixels is supplied,
In each of the selection periods, the pixels corresponding to the first set of scanning lines or the second set of scanning lines selected by the first drive circuit are defined as four pixels adjacent in the matrix direction as a block. The block specified in the second unit period is shifted by one pixel with respect to at least one of the direction in which the scanning line extends or the direction in which the signal line extends, with respect to the block specified in the unit period. Yes, a weighted average of each gradation to be displayed by the four pixels belonging to the block is calculated based on the display data, and a gradation potential corresponding to the calculated gradation is supplied to the four pixels belonging to the block A second drive circuit;
An electro-optical device comprising: An electro-optical device that alternately displays an image for the right eye and an image for the left eye for each display period,
A plurality of scanning lines composed of a plurality of first scanning lines and a plurality of second scanning lines arranged alternately;
A plurality of signal lines intersecting the plurality of scanning lines;
A plurality of pixels arranged corresponding to each intersection of the plurality of scanning lines and the plurality of signal lines;
In each of the right eye image display period and the left eye image display period,
In the first unit period of the display period, a first set of scanning lines including the first scanning line and the second scanning line adjacent to each other among the plurality of scanning lines is sequentially selected for each selection period. ,
In the second unit period after the elapse of the first unit period, the first scan line adjacent to each other in a combination shifted by one from the first set of scan lines selected in the first unit period and the first unit period A first drive circuit that sequentially selects a second set of scan lines each consisting of a second scan line for each selection period;
Display data indicating a gradation to be displayed by each of the plurality of pixels is supplied,
In each of the selection periods, the pixels corresponding to the first set of scanning lines or the second set of scanning lines selected by the first drive circuit are divided into four pixels adjacent to each other in the matrix direction, and Among the gradations to be displayed by the four pixels to which the pixel belongs, the maximum gradation is the maximum display gradation, the minimum gradation is the minimum display gradation, and the difference between the maximum display gradation and the minimum display gradation is the difference scale. Key
When the difference gradation is larger than a predetermined threshold, a weighted average of each gradation to be displayed by the four pixels belonging to the block is calculated based on the display data, and a gradation potential corresponding to the calculated gradation To the four pixels belonging to the block,
When the difference gray level is equal to or lower than the predetermined threshold value, the gray level potential corresponding to the gray level to be displayed by the pixel at the predetermined position among the four pixels belonging to the block is supplied to the four pixels belonging to the block. Two drive circuits;
An electro-optical device comprising: 3. The electro-optical device according to claim 1, wherein in the calculation of the weighted average, a weighting coefficient applied to the gradation of each pixel is greater than 0. 4. The electro-optical device according to claim 1, wherein the weighting coefficients given to the gradation of each pixel are equal values. The maximum gradation among the gradations to be displayed by the four pixels belonging to the block is the maximum display gradation, and the minimum gradation among the gradations to be displayed by the four pixels belonging to the block is the minimum display gradation. And an average value of gradations specified for each of a predetermined number of pixels including four pixels belonging to the block is an average gradation,
When the absolute value of the difference between the maximum display gradation and the average gradation is the first difference gradation, and the absolute value of the difference between the average gradation and the minimum display gradation is the second difference gradation,
If the first difference gradation is greater than the second difference gradation, the weighting coefficient of the pixel corresponding to the maximum display gradation is made larger than the weighting coefficient of the other pixels;
The weighting coefficient of a pixel corresponding to the minimum display gradation is set larger than the weighting coefficients of other pixels when the second difference gradation is larger than the first difference gradation. Electro-optic device. An electro-optical device that alternately displays an image for the right eye and an image for the left eye for each display period,
A plurality of scanning lines composed of a plurality of first scanning lines and a plurality of second scanning lines arranged alternately;
A plurality of signal lines intersecting the plurality of scanning lines;
A plurality of pixels arranged corresponding to each intersection of the plurality of scanning lines and the plurality of signal lines;
In each of the right eye image display period and the left eye image display period,
In the first unit period of the display period, a first set of scanning lines including the first scanning line and the second scanning line adjacent to each other among the plurality of scanning lines is sequentially selected for each selection period. ,
In the second unit period after the elapse of the first unit period, the first scanning line and the second scanning line are shifted by one line from the first set of scanning lines selected in the first unit period. A first drive circuit that sequentially selects a second set of scanning lines consisting of:
Display data indicating a gradation to be displayed by each of the plurality of pixels is supplied,
In each of the selection periods, the pixels corresponding to the first set of scanning lines or the second set of scanning lines selected by the first drive circuit are divided into four pixels adjacent in the matrix direction.
An average value of each gradation to be displayed by the four pixels belonging to the block is set as a first average gradation, and an average value of gradations designated for each of a predetermined number of pixels including the four pixels belonging to the block is determined. When the second average gradation is used,
In each of the first unit period and the second unit period, a gradation control coefficient is determined based on each gradation to be displayed by the four pixels belonging to the block and the second average gradation, and the gradation control coefficient And a second driving circuit for supplying a gradation potential corresponding to the gradation obtained by multiplying the first average gradation to the four pixels belonging to the block;
An electro-optical device comprising: When the maximum gradation among the gradations to be displayed by the four pixels belonging to the block is the maximum display gradation and the minimum gradation is the minimum display gradation,
The second driving circuit includes:
When the absolute value of the difference between the maximum display gradation and the second average gradation is larger than the absolute value of the difference between the second average gradation and the minimum display gradation, the gradation control coefficient is set to 1. Set to a larger value,
When the absolute value of the difference between the maximum display gradation and the second average gradation is smaller than the absolute value of the difference between the second average gradation and the minimum display gradation, the gradation control coefficient is set to 0. The electro-optical device according to claim 6, wherein the electro-optical device is set to a value that is larger and smaller than 1. The electro-optical device according to claim 5, wherein the predetermined number of pixels includes four pixels belonging to the block and twelve pixels surrounding the block. An electro-optical device that alternately displays an image for the right eye and an image for the left eye for each display period,
A plurality of scanning lines composed of a plurality of first scanning lines and a plurality of second scanning lines arranged alternately;
A plurality of signal lines intersecting the plurality of scanning lines;
A plurality of pixels arranged corresponding to each intersection of the plurality of scanning lines and the plurality of signal lines;
In each of the right eye image display period and the left eye image display period,
In the first unit period of the display period, a first set of scanning lines including the first scanning line and the second scanning line adjacent to each other among the plurality of scanning lines is sequentially selected for each selection period. ,
In the second unit period after the elapse of the first unit period, the first scanning lines adjacent to each other in a combination shifted by a plurality of lines from the first set of scanning lines selected in the first unit period and the first unit period A first drive circuit that sequentially selects a second set of scan lines each consisting of a second scan line for each selection period;
Display data indicating a gradation to be displayed by each of the plurality of pixels is supplied,
In each of the selection periods, the pixels corresponding to the first set of scan lines or the second set of scan lines selected by the first drive circuit are set as a block of four or more pixels adjacent in the matrix direction.
An image signal to be displayed by four or more pixels belonging to the block is generated based on the display data, and a gradation potential corresponding to the generated gradation is supplied to the four or more pixels belonging to the block. A second drive circuit;
An electro-optical device comprising: Each of the display period of the right-eye image and the display period of the left-eye image includes the first unit period and the second unit period,
The second driving circuit includes:
In each of a plurality of control periods including a display period of the right-eye image and a display period of the left-eye image that are in phase with each other,
In the first control period of the plurality of control periods,
In the first unit period of each display period, the polarity of the gradation potential with respect to a reference potential is set to one of positive polarity and negative polarity, and the second unit period of each display period Then, the polarity of the gradation potential is set to be the other polarity,
In the second control period immediately after the first control period among the plurality of control periods,
The polarity of the gradation potential is set to the other polarity in the first unit period of each display period, and the polarity of the gradation potential is set to one in the second unit period of each display period. The polarity is set to be
The electro-optical device according to claim 1. An electro-optical device that displays a right-eye image and a left-eye image stereoscopically viewed with stereoscopic glasses including a right-eye shutter and a left-eye shutter,
Controlling both the right-eye shutter and the left-eye shutter in a closed state in a period including at least a part of the first unit period among the display periods,
Controlling the right-eye shutter in an open state in a period including at least a part of the second unit period in each display period of the right-eye image, and controlling the left-eye shutter in a closed state;
An eyeglass control circuit that controls the left-eye shutter to an open state and controls the right-eye shutter to a closed state in a period including at least a part of the second unit period in each display period of the left-eye image. The electro-optical device according to claim 1, wherein the electro-optical device is provided. Each of the right eye image display period and the left eye image display period includes the first unit period, the second unit period, the first unit period, and the second unit period.
The second driving circuit includes:
In the first first unit period of each display period, the polarity of the gradation potential with respect to a reference potential is set to be one of positive polarity and negative polarity,
In the first second unit period of each display period, the polarity of the gradation potential is set to be the other polarity,
In the final first unit period of each display period, the polarity of the gradation potential is set to the other polarity,
10. The electro-optic according to claim 1, wherein the polarity of the gradation potential is set to one polarity in the last second unit period of each display period. 11. apparatus. An electro-optical device that displays a right-eye image and a left-eye image stereoscopically viewed with stereoscopic glasses including a right-eye shutter and a left-eye shutter,
Controlling both the right-eye shutter and the left-eye shutter in a closed state in a period including at least a part of the first first unit period among the display periods,
The right-eye shutter is controlled to be in an open state in a period including at least a part from the start of the first second unit period to the end of the last second unit period in each display period of the right-eye image. And controlling the left-eye shutter to a closed state,
The left-eye shutter is controlled to be open in a period including at least a part from the start of the first second unit period to the end of the last second unit period in each display period of the left-eye image. And a glasses control circuit for controlling the shutter for the right eye to a closed state,
The electro-optical device according to claim 12, comprising:   An electronic apparatus comprising the electro-optical device according to claim 1.

Images