JP4952013B2 - Display device - Google Patents

Description

  The present invention relates to a display device, and more particularly, to a display device that provides a first image in a first observation region and a second image in a second observation region.

  2. Description of the Related Art Conventionally, as a display device mounted on a television receiver, an information device, or the like, a liquid crystal display device using a display liquid crystal panel (LCD; Liquid Crystal Display, hereinafter abbreviated as “LCD”) is known. Yes. As for a display device such as a liquid crystal display device, a two-screen display is known in which a first image is provided in a first observation region and a second image is provided in a second observation region.

  Next, a conventional display device that performs two-screen display will be described with reference to the drawings. FIG. 8 is a cross-sectional view illustrating a display device according to a conventional example. As shown in FIG. 8, in the display device 100, a display panel in which first pixel columns 10A for displaying a first image and second pixel columns 10B for displaying a second image are alternately arranged. 10 is arranged. Here, the first and second pixel columns 10A and 10B are composed of pixels including a liquid crystal layer, for example. Also, a so-called black matrix 11 is formed between the pixels of the first and second pixel columns 10A and 10B. A light shielding plate 40 made of metal or resin having a light shielding function is disposed above the display panel 10 via a transparent substrate such as a glass substrate (not shown). The light shielding plate 40 includes light shielding portions 41 and openings 42 that alternately extend in parallel to the first pixel row 10A and the second pixel row 10B.

  Next, a mechanism for realizing two-screen display with the above configuration will be described. As shown in FIG. 8, the first image from the first pixel row 10 </ b> A passes through the opening 42 of the light shielding plate 40 in the first observation area A that is leftward from the position C in front of the display panel 10. Provided. At this time, the second image of the second pixel row 10B is not provided to the first observation area A because it is blocked by the light blocking portion 41 of the light blocking plate 40.

  On the other hand, a second image is provided from the second pixel row 10B through the opening 42 of the light shielding plate 40 to the second observation region B that is separated from the position C in front of the display panel 10 in the right direction. At this time, the first image of the first pixel row 10 </ b> A is not provided to the second observation region B because it is blocked by the light blocking portion 41 of the light blocking plate 40. In this way, a two-screen display is performed in which the first image is provided in the first observation area A and the second image is provided in the second observation area B.

In addition, the following patent documents are mentioned as technical documents relevant to the present application.
JP 2005-258016 A

  However, in the two-screen display by the above-described display device, when the display panel 10 is observed from the position C in front of the display panel 10, a double image in which the first and second images are superimposed is generated. That is, the first image and the second image cannot be distinguished from each other, and the display quality of the two-screen display is lowered.

  Accordingly, the present invention provides a display device that provides a first image in a first observation area and provides a second image in a second observation area, and suppresses a double image at a position directly in front of the display panel. It is.

The display device of the present invention controls the liquid crystal barrier disposed above the display panel by the control circuit to provide the first image in the first observation region and the second image in the second observation region. In the display device to be provided, the display panel includes a first pixel that displays the first image and a second pixel that displays the second image arranged in a row direction and a column direction. Each of the first pixel and the second pixel includes a matrix that is divided into a plurality of row units and is alternately arranged in each row, and the liquid crystal barrier includes a plurality of first pixels extending in the column direction. Transparent electrodes, a second transparent electrode extending along one side of each first transparent electrode, and a third transparent electrode extending along the other side of each first transparent electrode are arranged A first transparent substrate, a second transparent substrate on which a fourth transparent electrode is disposed, and a front A liquid crystal layer sandwiched between the first transparent substrate the second transparent substrate consists of, the first transparent electrode, and the sets of the second transparent electrode, and the third transparent electrodes, wherein The non-formation region of the set is divided into a plurality of row units, and is alternately arranged in each row, and the control circuit is in a non-transmissive state on the first transparent electrode and the second transparent electrode. become possible, the position of lead straight line substantially 2 you divide the display panel in the column direction is, a first state in which the boundary between the first observation region and the second observation region , wherein the first transparent electrode on that third and a on the transparent electrode in a non-transmissive state, Oite the said display panel in the column direction toward the position on the lead straight substantially 2 you divide Switching between the first state or the second state in which the second image is provided.
In the display device of the present invention, the control circuit controls the liquid crystal barrier disposed above the display panel to provide the first image in the first observation area and the second observation area. In the display device that provides an image, the display panel includes a first pixel that displays the first image and a second pixel that displays the second image arranged in a row direction and a column direction. In addition, each of the first pixel and the second pixel includes a matrix that is divided into a plurality of row units and is alternately arranged in each row, and the liquid crystal barrier includes a plurality of liquid crystal barriers extending in the column direction. A first transparent layer in which a fixed light shielding layer, a first transparent electrode extending along one side of each fixed light shielding layer, and a second transparent electrode extending along the other side of each fixed light shielding layer are arranged. A substrate, a second transparent substrate on which a third transparent electrode is disposed, and the first A liquid crystal layer sandwiched between the transparent substrate and the second transparent substrate consists of, the fixed light-shielding layer, the first transparent electrode, and a set consisting of the second transparent electrode, said set of non-forming region and are respectively divided into a plurality of row units are arranged alternately in each row, the control circuit, by on the first transparent electrode is non-transparent state, the display panel in the column direction position on the lead straight substantially 2 you split, a first state in which the boundary between the first observation region and the second observation region, on the second transparent electrode is non-transparent state it is, switching between, and a second state in which substantially position the Oite the first image or the second image on the lead straight you 2 divided is provided with the display panel in the column direction.

  According to the display device of the present invention, in the display device that provides the first image in the first observation region and provides the second image in the second observation region, the first and the first images at the position in front of the display panel are provided. The double image consisting of the second image can be suppressed and the display quality of the two-screen display can be improved as compared with the conventional example. Furthermore, the positions of the first observation region and the second observation region can be moved according to the orientation of the display panel.

  Next, a display device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view for explaining a display device according to an embodiment of the present invention. 1A and 1B, a display panel 10 described later and a moving barrier 30 overlapping therewith are separately shown. FIG. 2 is a sectional view taken along line XX in FIG. That is, FIG. 2 shows a cross section in a direction orthogonal to a first pixel column 10A and a second pixel column 10B described later. FIG. 2 shows a case where the position of a transmission part of the movement barrier 30 described later is in the first state. In FIG. 1 and FIG. 2, the same components as those shown in FIG.

  As shown in FIGS. 1 and 2, the display device 1 has alternately arranged first pixel columns 10 </ b> A for displaying a first image and second pixel columns 10 </ b> B for displaying a second image. A display panel 10 is arranged. A so-called black matrix 11 is arranged between the pixels of the first and second pixel columns 10A and 10B. Here, the first and second pixel columns 10A and 10B are composed of pixels including a liquid crystal layer, for example. Alternatively, the first and second pixel rows 10A and 10B are not limited to pixels having a liquid crystal layer, and may be composed of other pixels, for example, pixels having an organic electroluminescence element as a light emitting element. Good.

  In addition, a first observation area A where the first image is provided exists on the left side of the position C1 directly in front of the display panel 10, and a second image is provided on the right side of the position C1 in front of the display panel 10. The second observation region B to be displayed exists. The position C1 directly in front of the display panel 10 means a position on or near a vertical line on a line that divides the display panel 10 into two substantially in a direction orthogonal to the first and second pixel columns 10A and 10B.

  In addition, between the display panel 10 and the first observation area A and the second observation area B, the movement barrier 30 is disposed above the display panel 10 via a transparent substrate such as a glass substrate (not shown). Yes. As will be described later, the movement barrier 30 includes light shielding portions and transmission portions that alternately extend in parallel to the first pixel row 10A and the second pixel row 10B, and can move the positions of the light shielding portions and the transmission portions. is there. The first observation region A and the second observation region B can be moved by the movement of the transmission part of the movement barrier 30.

  Next, the configuration of the movement barrier 30 will be described with reference to the drawings. FIG. 3 is a cross-sectional view illustrating the display device according to the embodiment of the present invention, and is an enlarged view of the movement barrier 30 of FIG. 3A shows a case where the position of the transmission part of the movement barrier 30 is in the first state, and FIG. 3B shows a case where the position of the transmission part of the movement barrier 30 is in the second state. ing.

  2 and 3A, the movement barrier 30 includes a first transparent substrate 32A having a first polarizing plate 31A, a second transparent substrate 32B having a second polarizing plate 31B, And a liquid crystal barrier comprising a liquid crystal layer LC sandwiched between the transparent substrates. The first transparent substrate 32A and the second transparent substrate 32B are made of, for example, a glass substrate. In addition, the movement barrier 30 is configured as a normally white type that transmits light when no electric field is generated in the liquid crystal layer LC.

  Furthermore, a plurality of first transparent electrodes 33 extending in parallel to the first pixel column 10A and the second pixel column 10B are arranged on the first transparent substrate 32A at equal intervals. On the first transparent substrate 32A, a second transparent electrode 34 insulated from the first transparent electrode 33 is disposed along one side of each first transparent electrode 33, and the other side. A third transparent electrode 35 insulated from the first transparent electrode 33 is arranged along the line.

  In addition, a fourth transparent electrode 36 to which a common potential is supplied is disposed on the second transparent substrate 32B. The first to fourth transparent electrodes 33, 34, 35, and 36 are made of a transparent metal such as ITO (Indium Tin Oxide).

  Further, the movement barrier 30 has a non-transmissive state on the first transparent electrode 33 and a non-transmissive state on one of the second transparent electrode 34 and the third transparent electrode 35. A control circuit CNT for controlling voltage application is connected so as to be.

  As shown in FIG. 3A, when the movement barrier 30 is in the first state, the control circuit CNT causes the first transparent electrode 33 and the second transparent electrode 34 to be in a non-transmissive state. Be controlled. That is, a voltage is applied from the control circuit CNT to the first transparent electrode 33 and the second transparent electrode 34, and a common potential is supplied to the fourth transparent electrode 36. As a result, an electric field is generated in the liquid crystal layer LC on the first transparent electrode 33 and the second transparent electrode 34, and the alignment of the liquid crystal molecules of the liquid crystal layer LC changes along the electric field, so that the optical characteristics are changed. Change. At this time, in the movement barrier 30, the first transparent electrode 33 and the second transparent electrode 34 are light-shielding portions in the first state, and a region other than the light-shielding portions is the transmission portion 37A in the first state. It becomes.

  On the other hand, as shown in FIG. 3B, when the movement barrier 30 is in the second state, the control circuit CNT makes the first transparent electrode 33 and the third transparent electrode 35 non-transmissive. To be controlled. That is, a voltage is applied from the control circuit CNT to the first transparent electrode 33 and the third transparent electrode 35, and a common potential is supplied to the fourth transparent electrode 36. Thereby, an electric field is generated in the liquid crystal layer LC on the first transparent electrode 33 and the third transparent electrode 35. Then, the alignment of the liquid crystal molecules in the liquid crystal layer LC changes along the electric field, and the optical characteristics change. At this time, in the movement barrier 30, the first transparent electrode 33 and the third transparent electrode 35 are light shielding portions in the second state, and regions other than the light shielding portions are transmission portions 37B in the second state. It becomes.

  Next, the arrangement relationship between the components of the display panel 10 and the movement barrier 30 will be described. Here, in FIG. 2, each width of the first observation region A and the second observation region B is F. In addition, the movement distance of the first observation region A and the second observation region B in the first state and the second state is set to F / 2. The distance between the first observation region A and the second observation region B and the moving barrier 30 is D. In addition, the distance between the movement barrier 30 and the display panel 10 is G. Further, each pitch of the first pixel column 10A and the second pixel column 10B of the display panel 10 is P.

In the movement barrier 30 of FIG. 3, each width of the second transparent electrode 34 and the third transparent electrode 35 is S. The width S is precisely defined by the distance from the end of the first transparent electrode 33 to the end of the second transparent electrode 34 or the third transparent electrode 35 adjacent thereto. The width S is a moving distance of the light shielding part and the transmission part of the movement barrier 30. Moreover, when the 1st transparent electrode 33, the 2nd transparent electrode 34, and the 3rd transparent electrode 35 are made into one set, let the pitch of the set be R. At this time, the display panel 10 and the movement barrier 30 are formed so as to satisfy Formula 1.
S ≦ R / 4 (1)

  Next, the reason why Formula 1 is obtained will be described with reference to the drawings. FIGS. 4A and 4B are conceptual diagrams illustrating the positional relationship between the display panel 10 and the movement barrier 30 in FIG.

  As shown in FIG. 4A, a pitch 2P corresponding to two pixel columns of the first pixel column 10A and the second pixel column 10B of the display panel 10 is defined as a base, and a vertex that is perpendicular to the base is defined as a first vertex. A triangle HJK (hereinafter abbreviated as ΔHJK) is obtained when the position H in the observation area A or the second observation area B is obtained. Further, when the pitch R when the first transparent electrode 33, the second transparent electrode 34, and the third transparent electrode 35 are set as one set is a base, and a vertex that is perpendicular to the base is a position H. , A triangular HIL (hereinafter abbreviated as ΔHIL) is obtained.

In order for the first image or the second image to be observed through the transmission part 37A in the first state or the transmission part 37B in the second state of the movement barrier 30, ΔHJK and ΔHIL must be similar. There is. Therefore, considering the case where ΔHJK and ΔHIL are similar, the ratio of 2P to R is equal to the ratio of side HJ to side HI. Further, the side HI is equal to the distance D, and the sum of the side HJ, the distance D, and the distance G is equal. That is, if ΔHJK and ΔHIL are similar, Equation 2 is obtained.
R: 2P = D: (D + G) (2)

  Further, as shown in FIG. 4B, the moving distance F / 2 of the first observation area A and the second observation area B is the base, and the vertex that is perpendicular to the base is the first of the display panel 10. If the position in the pixel column 10A or the second pixel column 10B is J, a triangle JHO (hereinafter abbreviated as ΔJHO) is obtained. A triangle JMN (hereinafter abbreviated as ΔJMN) is obtained when the width S is the base and the vertex perpendicular to the base is the position J.

  In order to provide the first image or the second image with respect to the range of the moving distance F / 2 of the first observation region A and the second observation region B, the width S is set to ΔJHO and Δ It should be a value that makes JMN similar.

Therefore, considering the case where ΔJHO and ΔJMN are similar, the ratio of the movement distance F / 2 to the width S is equal to the ratio of the side JH to the side JM. Further, the side JM and the distance G are equal, and the sum of the side JH, the distance D, and the distance G is equal. That is, if ΔJHO and ΔJMN are similar, Equation 3 is obtained.
S: F / 2 = G: (D + G) (3)

Further, as a condition for providing the first image and the second image corresponding to the first observation area A and the second observation area B, the display panel 10 is formed so as to satisfy Expression 4. Has been.
P: V = G: D (4)

Here, when Formula 2, Formula 3, and Formula 4 are solved for S, Formula 5 is obtained.
S = R / 4 (5)

  By the way, in the above description, the moving distance of the first observation area A and the second observation area B is set to F / 2. However, when the first observation area A and the second observation area B are moved so as to suppress the double image at the position C in front of the display panel 10, it is not necessary to make the movement distance larger than F / 2. It is said that. That is, the moving distance is F / 2 or less. By reflecting this in Expression 5, Expression 1 is obtained.

  Next, a mechanism for realizing the two-screen display with the above configuration will be described with reference to FIGS. FIG. 5 is a cross-sectional view along the line XX in FIG. 1 as in FIG. 2, but shows a case where the position of the transmission part of the movement barrier 30 is in the second state.

  First, the first state will be described. As shown in FIG. 2, the first image is provided from the first pixel column 10 </ b> A to the first observation region A through the transmission part 37 </ b> A in the first state of the movement barrier 30. At this time, since the second image of the second pixel row 10B is blocked on the light shielding portion of the movement barrier 30, that is, on the first transparent electrode 33 and the second transparent electrode 34, the first observation area A Not offered to.

  On the other hand, in the second observation region B, the second image is provided from the second pixel row 10B through the transmission part 37A in the first state of the movement barrier 30. At this time, the first image of the first pixel row 10 </ b> A is not provided to the second observation region B because it is blocked by the light blocking portion of the movement barrier 30. In this way, a two-screen display is performed in which the first image is provided in the first observation area A and the second image is provided in the second observation area B. However, at the position C1 directly in front of the display panel 10, a double image composed of the first image and the second image is observed.

  Next, the second state will be described. As shown in FIG. 5, the transmission part 37B in the second state of the movement barrier 30 has moved to the right side of the transmission part 37A in the first state. Similarly, the light shielding portion also exists on the first transparent electrode 33 and the third transparent electrode 35, and is moved to the right side of the light shielding portion in the first state.

  Therefore, since the first image and the second image passing through the transmission part 37B are provided on the right side as compared with the first state, the first observation region A and the second observation region B are respectively Move to the right by a distance of F / 2. That is, the position C1 directly in front of the display panel 10 is the first observation area A where the first image is provided, and a double image as seen in the first state is not observed. In other words, the first observation region A and the second observation region B can be moved by switching between the first state and the second state.

  Furthermore, in the present embodiment, the movement barrier 30 is placed on the first transparent electrode 33, the second transparent electrode 34, as a state other than the first state and the second state as necessary. The control circuit CNT may control the third transparent electrode 35 so as to be in a transmissive state. In this case, the entire movement barrier 30 functions as a simple transparent plate. At this time, by making the first image and the second image the same image, a one-screen display that provides one common image for the first observation area A and the second observation area B is displayed. It can be carried out. At that time, the moving barrier 30 has no light shielding portion. Therefore, it is possible to realize a single screen display without lowering the luminance as compared with a case where a single screen display is realized by making the first image and the second image the same in a two-screen display state. Can do.

  Incidentally, the switching between the first state and the second state in the above-described two-screen display can be arbitrarily performed, but may be automatically switched according to the orientation of the display panel 10 as described below. FIG. 6 is a top view for explaining the display device according to the embodiment of the present invention, and shows the arrangement relationship between the display device 1 and the first and second observation regions from above. FIG. 6A corresponds to the first state, and FIG. 6B corresponds to the second state.

  As shown in FIG. 6A, the display device 1 is connected to a detector DTC that detects the horizontal direction. In the first state, neither the first observer OB1 nor the second observer OB2 exists at the position C1 in front of the display panel 10. The first observer OB1 is present in the first observation area A and observes the first image. The second observer OB2 is present in the second observation region B and observes the second image.

  Then, as shown in FIG. 6B, when the orientation of the display panel 10 is changed so that the first observer OB1 exists on the position C1 in front of the display panel 10, the first observer OB1. Will observe a double image composed of the first image and the second image.

  Therefore, the detector DTC detects the angle θ corresponding to the change in the orientation of the display panel 10 in order to switch to the second state. Then, according to the detection result of the detector DTC, the control circuit CNT moves the transmission part 37A in the first state of the movement barrier 30 to the transmission part 37B in the second state. The control circuit CNT at this time controls the transmission state on the first transparent electrode 33, the second transparent electrode 34, and the third transparent electrode 35 in the movement barrier 30, as described above. Thus, the first observer OB1 is present in the moved first observation region A even at the position C1 in front of the display panel 10, and can observe the first image.

  Further, switching between the two-screen display and the one-screen display may be automatically switched according to the orientation of the display panel 10. In this case, the transmission state on the first transparent electrode 33, the second transparent electrode 34, and the third transparent electrode 35 of the movement barrier 30 is controlled by the control circuit CNT according to the detection result of the detector DTC. Be controlled.

  Note that the display panel 10 and the first to third transparent electrodes 33, 34, and 35 of the above embodiment are not limited to the configuration shown in FIG. You may arrange as follows. FIG. 7 is a plan view for explaining a display device according to an embodiment of the present invention. FIGS. 7A and 7B separately show the display panel 10 and a set of first to third transparent electrodes 33, 34, and 35 of the moving barrier 30G overlapping therewith.

  As shown in FIG. 7A, the first pixel column 10A and the second pixel column 10B may be further divided into a plurality of row units, and may be alternately arranged in each row. Further, corresponding to the first pixel column 10A and the second pixel column 10B at this time, as shown in FIG. 7B, the first to third transparent electrodes 33, 34, 35 of the movement barrier 30G. And the transparent electrode non-formation regions may be divided in units of rows and arranged alternately in each row. Thereby, since the observed first and second images are alternately present not only in the column unit but also in the row unit, the visibility during the two-screen display can be further improved.

  Moreover, in the said embodiment, when it is not necessary to perform the said 1 screen display, it is not necessary to be on the 1st transparent electrode 33 of the movement barriers 30 and 30G. In this case, instead of the first transparent electrode 33, a fixed light-shielding layer made of a non-transparent metal or non-metal material and constantly shielding light may be formed in the formation region.

  Moreover, in the said embodiment, although the movement barriers 30 and 30G shall have the structure which moves the permeation | transmission part 37B in a 2nd state to the right side rather than the permeation | transmission part 37A in a 1st state, this invention is this. It is not limited to. That is, the movement barrier 30 may have a configuration for moving the transmission part 37B to the left side of the transmission part 37A in the first state.

  In the above embodiment, the moving barriers 30 and 30G are configured as a normally white type, but the present invention is not limited to this. That is, the present invention is also applied to the case where the moving barriers 30 and 30G are configured as a normally black type.

  In the above embodiment, the moving barriers 30 and 30G are liquid crystal barriers, but the present invention is not limited to this. That is, the present invention may be provided with a movement barrier other than the liquid crystal barrier as long as the light-shielding part and the transmission part move so as to exhibit the above effects.

It is a top view explaining the display apparatus which concerns on embodiment of this invention. It is sectional drawing explaining the display apparatus which concerns on embodiment of this invention. It is sectional drawing explaining the display apparatus which concerns on embodiment of this invention. It is a conceptual diagram explaining the arrangement | positioning relationship between the display panel of FIG. 2, and a movement barrier. It is sectional drawing explaining the display apparatus which concerns on embodiment of this invention. 1 is a top view illustrating a display device according to an embodiment of the present invention. It is a top view explaining the display apparatus which concerns on embodiment of this invention. It is sectional drawing explaining the display apparatus which concerns on a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Display panel 10A 1st pixel row | line 10B 2nd pixel row | line | column 11 Black matrix 30 Moving barrier 31A 1st polarizing plate 31B 2nd polarizing plate 32A 1st transparent substrate 32B 2nd transparent substrate 33 1st transparency Electrode 34 Second transparent electrode 35 Third transparent electrode 36 Fourth transparent electrode 37A Transmission portion 37B in the first state Transmission portion 40 in the second state Light-shielding plate 41 Light-shielding portion 42 Opening portion A First observation region B Second observation region C, C1 Position in front of display panel 10 CNT Control circuit DTC detector

Claims (7)

A display device that controls a liquid crystal barrier disposed above a display panel by a control circuit to provide a first image in a first observation area and a second image in a second observation area. ,
In the display panel, a first pixel that displays the first image and a second pixel that displays the second image are arranged in a row direction and a column direction, and the first pixel and the second pixel Each of the second pixels includes a matrix that is divided into a plurality of rows and is alternately arranged in each row ,
The liquid crystal barrier is
A plurality of first transparent electrodes extending in the column direction; a second transparent electrode extending along one side of each first transparent electrode; and a second extending along the other side of each first transparent electrode. A first transparent substrate on which three transparent electrodes are disposed;
A second transparent substrate on which a fourth transparent electrode is disposed;
A liquid crystal layer sandwiched between the first transparent substrate and the second transparent substrate,
The set of the first transparent electrode, the second transparent electrode, and the third transparent electrode, and the non-formation region of the set are each divided into a plurality of row units, and are alternately arranged in each row. And
The control circuit includes:
Wherein the first transparent electrode on that second and the on the transparent electrode in a non-transmissive state, position lead straight line substantially 2 you divide the display panel in the column Direction is the first A first state serving as a boundary between the observation region and the second observation region;
By the first and the transparent electrode and the third transparent electrodes on becomes non-transmissive state, Oite the first of the display panel in the column direction toward the position on the lead straight substantially 2 you divide A second state in which one image or the second image is provided;
Display device to switch between. The width in the row direction of the second transparent electrode or the third transparent electrode of the liquid crystal barrier is S, and the first transparent electrode, the second transparent electrode, and the third transparent electrode are defined as 1 When the pitch in the row direction of the set when it is a set is R,
S ≦ R / 4
The display device according to claim 1 , wherein: A detector for detecting the orientation of the display panel;
2. The control circuit according to claim 1, wherein the control circuit controls the transparent electrode of either the second transparent electrode or the third transparent electrode to be in a non-transmissive state according to a detection result of the detector. The display device according to claim 2.   The control circuit controls the liquid crystal barrier so that the first transparent electrode, the second transparent electrode, and the third transparent electrode are in a transmissive state as necessary. Or the display apparatus of Claim 2.   A display device that controls a liquid crystal barrier disposed above a display panel by a control circuit to provide a first image in a first observation area and a second image in a second observation area. ,
  In the display panel, a first pixel that displays the first image and a second pixel that displays the second image are arranged in a row direction and a column direction, and the first pixel and the second pixel Each of the second pixels includes a matrix that is divided into a plurality of rows and is alternately arranged in each row,
  The liquid crystal barrier is
  A plurality of fixed light shielding layers extending in the column direction, a first transparent electrode extending along one side of each fixed light shielding layer, and a second transparent electrode extending along the other side of each fixed light shielding layer A first transparent substrate disposed;
  A second transparent substrate on which a third transparent electrode is disposed;
  A liquid crystal layer sandwiched between the first transparent substrate and the second transparent substrate,
  The set composed of the fixed light-shielding layer, the first transparent electrode, and the second transparent electrode, and the non-formation region of the set are each divided into a plurality of rows, and are alternately arranged in each row.
  The control circuit includes:
  When the first transparent electrode is in a non-transmissive state, the position on the vertical line that substantially bisects the display panel in the column direction is the boundary between the first observation region and the second observation region. A first state,
  When the second transparent electrode is in a non-transmissive state, the first image or the second image is provided at a position on a vertical line that substantially divides the display panel into two in the column direction. The state of
  Display device to switch between.   The row width of the first transparent electrode or the second transparent electrode of the liquid crystal barrier is S, and the fixed light-shielding layer, the first transparent electrode, and the second transparent electrode are a set. When the pitch in the row direction of the set is R,
  S ≦ R / 4
  The display device according to claim 5, wherein:   A detector for detecting the orientation of the display panel;
  6. The control circuit according to claim 5, wherein the control circuit controls the transparent electrode of either the first transparent electrode or the second transparent electrode to be in a non-transmissive state according to a detection result of the detector. The display device according to claim 6.

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