JP4600219B2 - Driving method of liquid crystal display device - Google Patents

Description

The present invention relates to a driving method of a liquid crystal display device which can cause a liquid crystal display device to perform a narrow viewing angle display.

The liquid crystal display device includes a liquid crystal display device having a screen area in which a plurality of pixels in a matrix that controls the transmittance of light, are disposed on the side opposite to the viewing side of the liquid crystal display device, the liquid crystal display device It consists of a surface light source that illuminates the illumination light.

The liquid crystal display device, the viewing angle is wide, Show, there is a risk of peeping from a direction inclined by a third party with respect to the front direction (direction around the normal line of the liquid crystal display device).

Therefore, on one surface side of the liquid crystal display element, there is provided a viewing angle limiting liquid crystal element in which liquid crystal molecules are aligned in different alignment states for each of the divided regions divided into a plurality of regions corresponding to the screen of the liquid crystal display element. arrangement and a method to limit the viewing angle of the liquid crystal display device has been proposed by the view angle limiting liquid crystal element (see Patent Document 1).

  The viewing angle limiting liquid crystal element is a method of the liquid crystal display element for each divided region obtained by dividing liquid crystal molecules in a liquid crystal layer sealed between a pair of substrates into a plurality of regions corresponding to the screen of the liquid crystal display device. An alignment state having a viewing angle in a direction tilted in one direction with respect to the line direction and an alignment state having a viewing angle in a direction tilted in the opposite direction to the direction, and the pair of substrates are opposed to each other Each of the inner surfaces is provided with electrodes having a predetermined shape corresponding to the respective divided regions.

  This viewing angle limiting method limits the viewing angle of the display image of the liquid crystal display element by reducing the visibility from an oblique direction by applying a voltage between the electrodes of the viewing angle limiting liquid crystal element. When no voltage is applied between the electrodes of the viewing angle limiting liquid crystal element, that is, when the viewing angle limiting liquid crystal element is in a non-display state, a display image of the liquid crystal display element can be seen with a wide viewing angle.

On the other hand, when a voltage is applied between the electrodes of the viewing angle limiting liquid crystal element, the liquid crystal display element is viewed from a direction inclined in one direction with respect to the front direction and a direction inclined in the opposite direction. Display image of each segmented region having a viewing angle in a direction tilted in one direction of the viewing angle limiting liquid crystal element, and the predetermined segmented region having a viewing angle in a direction tilted in the opposite direction Since it is hidden by the display corresponding to the shape electrode, the display image of the liquid crystal display element cannot be recognized from the one direction and the direction inclined in the opposite direction, and the viewing angle of the display image is apparently limited. is, field of view angle of the display image becomes narrow.
JP 2004-133334 A

  However, the viewing angle limiting liquid crystal element in which the liquid crystal molecules are aligned in different alignment states for each of the divided regions obtained by dividing the region corresponding to the screen of the liquid crystal display element into each of the inner surfaces of the pair of substrates. Manufacture is difficult because a complicated alignment process (rubbing process of the alignment film) in which the direction is different for each divided region must be performed.

An object of the present invention is to provide a driving method of a liquid crystal display device that allows a liquid crystal display device to perform a narrow viewing angle display without using a liquid crystal element for limiting the viewing angle, which is difficult to manufacture.

This invention
A liquid crystal display device having a screen area in which a plurality of pixels in a matrix that controls the transmittance of light, the the observation side of the liquid crystal display element is disposed on the opposite side, in different directions toward the liquid crystal display device a surface light source for illuminating the two illumination light having a directivity, in the driving method of the liquid crystal display device provided with,
The liquid crystal display element, wherein among the original image data corresponding to each of the plurality of pixels for displaying one image in the entire screen area of the liquid crystal display device, a plurality of regions obtained by dividing the screen area into a plurality First selected image data for selecting data to be written in each pixel in a plurality of first areas selected in a checkered pattern, and a second of the plurality of areas other than the first area second selected image data and the time-divisionally switched and outputs the selected data to be written to each pixel in the area, in synchronization with the output of the first selected image data, said from the surface light source liquid without irradiating the first Rutotomoni below the second illumination light is irradiated with illumination light having a directivity toward a direction inclined in one direction with respect to the normal direction of the display device, said second selected image in synchronism with the output of the data, before the said surface light source The said one direction with respect to the normal direction, characterized in that not irradiated with the first illumination light causes illuminated the second illumination light having a directivity toward a direction inclined in the opposite direction.

The present invention, red, green, said each unit color blue first illumination light and the red, green, selectively the liquid crystal display and said second illumination light of each unit color blue to the unit for each color when applied to drive a field sequential liquid crystal display device including the surface light source for irradiating the element, the first selected image data and the second selected image data respectively, red, green and blue and image data comprising a unit color data, wherein a first frame for displaying an image corresponding to the first selected image data, the second selected image data a second for displaying an image corresponding to the a frame and for each field divided each of the three fields, the red first selected image data, green, red of each unit color data and said second selected image data of blue, green, and blue division manner when switching the unit color data The output to the liquid crystal display element for each write field of each unit color data of the first selected image data, the first illumination light having color unit colors light corresponding to the unit color of the output data of the field the without irradiating the is allowed Rutotomoni the second illumination light emitted from the surface light source, the each write field of each unit color data of the second selected image data, a color corresponding to the unit color of the output data of the field of the second illumination light it may be so as not to illuminate the first illumination light causes emitted from the surface light source.

Further, the present invention, red, green, red color filter of each color is provided in the blue, green, and the liquid crystal display device having a plurality of pixels of each color of blue, and the a white light first illumination light wherein when applied to drive the liquid crystal display device including the surface light source for irradiating the second selectively the liquid crystal display device illumination light, the selection of the first selected image data and the second The image data is image data composed of color data of three colors of red, green, and blue corresponding to the red, green, and blue pixels of the liquid crystal display element, and an image that corresponds to the first selected image data is a first frame for display, the red first selected image data, green, and outputs the color data of three colors of blue liquid crystal display element, corresponding to the second selected image data image In the second frame for displaying the second selection image. Red data, green, and outputs the color data of three colors of blue liquid crystal display element, said first frame, Rutotomoni the second to emit white of the first illumination light from the surface light source without irradiating the illumination light, the second frame may be so as not to irradiate the first illumination light from the surface light source causes irradiate white the second illumination light.

According to this driving method, it is possible to cause the liquid crystal display device to perform narrow viewing angle display without using a viewing angle limiting liquid crystal element that is difficult to manufacture.

(First embodiment)
1 to 6 show a first embodiment of the present invention. FIG. 1 is a perspective view of a liquid crystal display device, and FIG. 2 is a plan view of the liquid crystal display device.

The liquid crystal display device includes a liquid crystal display element having no color filter, first illumination light of each unit color of red, green, and blue and second illumination light of each unit color of red, green, and blue. a field sequential liquid crystal display device having a surface light source is selectively irradiated toward the liquid crystal display device in the unit for each color, the screen in which a plurality of pixels for controlling the transmittance of light (not shown) arranged in a matrix The liquid crystal display element 1 having the region 1a and the liquid crystal display element 1 are arranged on the opposite side to the observation side (lower side in FIG. 2) and have directivity in different directions toward the liquid crystal display element 1. Two illumination lights, that is, a first illumination light having directivity in a direction inclined in one direction with respect to the normal direction of the liquid crystal display element 1, and the one of the one with respect to the normal direction It has directivity in the direction inclined in the direction opposite to the direction. It has from the surface light source 8 which selectively irradiating the second illumination light.

Although the internal structure of the liquid crystal display element 1 is not shown, a pair of transparent substrates 2 and 3 joined via a frame-shaped sealing material 4 surrounding the screen region 1a and the substrates 2 and 3 are opposed to each other. Liquid crystal sealed in a region surrounded by the sealing material 4 between the pair of substrates 2 and 3 and a transparent electrode which is provided on each inner surface and forms a plurality of pixels arranged in a matrix by regions facing each other. a layer, a pair of polarizing plates 5 and 6 respectively disposed on an outer surface of the pair of substrates 2 and 3, is made of.

The liquid crystal display element 1 includes a plurality of pixel electrodes arranged in a matrix in the row direction and the column direction on the inner surface of one substrate 2, and the arrangement region of the plurality of pixel electrodes on the inner surface of the other substrate 3. An active matrix liquid crystal display element provided with a single film-like counter electrode facing each other, and an inner surface of the one substrate 2 is provided with an active element comprising TFTs respectively connected to the plurality of pixel electrodes, and each row a plurality of gate lines respectively connected to the TFT, and a plurality of data lines respectively connected to each column of TFT, is provided.

  The one substrate 2 has a driver mounting portion 2a extending outward from the other substrate 3, and the plurality of gate wirings and data wirings are led out to the driver mounting portion 2a. The driver is connected to a display driver 7 made of an LSI mounted on the driver mounting unit 2a.

  Further, an alignment film is provided on the inner surfaces of the pair of substrates 2 and 3 so as to cover the electrodes, and the liquid crystal molecules of the liquid crystal layer are defined by the alignment film between the pair of substrates 2 and 3. It is oriented in the orientation state.

The liquid crystal display device 1, the liquid crystal molecules a TN or STN type were twisted, the liquid crystal molecules with respect to the substrate 2 side vertically into oriented so the vertical alignment type, the substrate 2 without twisting the liquid crystal molecules, and to three sides flat horizontal alignment type has been oriented to the row, a liquid crystal or a liquid crystal display device of the molecule a bend alignment type to bend or ferroelectric or anti-ferroelectric liquid crystal display device, the pair The polarizing plates 5 and 6 are arranged with their transmission axes oriented so as to obtain good contrast characteristics.

  In the liquid crystal display element 1, a vertical electric field (electric field in the thickness direction of the liquid crystal layer) is generated between the electrodes provided on the inner surfaces of the pair of substrates 2 and 3 to change the alignment state of the liquid crystal molecules. For example, a comb-like first and second electrode for forming a plurality of pixels is provided on the inner surface of one of the pair of substrates 2 and 3, and a horizontal electric field ( A lateral electric field control type that changes the alignment state of the liquid crystal molecules by generating an electric field in a direction along the substrate surface may be used.

  Further, the liquid crystal display element 1 may be a normally white mode display element or a normally black mode display element.

The surface light source 8 is made of a plate-like transparent member such as an acrylic resin plate, and incident end surfaces 10a and 10b for allowing light to be incident on two opposite end surfaces are formed, and the incident end surface is formed on one of the two plate surfaces. A light exit surface 11 that emits light incident from 10a and 10b is formed, and a reflection surface 13 that reflects light incident from the light incident end surfaces 10a and 1b toward the light exit surface 11 is formed on the other plate surface. First and second light emitting elements 15a that are arranged to face the light plate 9, and one incident end face 10a and the other incident end face 10b of the light guide plate 9, respectively, and emit light toward the opposite incident end faces 10a, 10b. , which consists of a 15b,.

  The reflection surface 13 of the light guide plate 9 is formed such that the end regions on the side of the two incident end surfaces 10a and 10b are curved surfaces that are closer to the exit surface 11 toward the incident end surfaces 10a and 10b, and the other portions. The reflecting surface 13 has a shape formed on a flat surface, and a reflecting film 14 made of a metal film such as aluminum is formed on the entire reflecting surface 13. The reflective surface 13 may be an internal reflective surface that totally reflects light incident from the incident end surfaces 10a and 10b at the interface with the outside air (air).

  The light exiting surface 11 of the light guide plate 9 is formed in parallel with the flat surface portion of the reflecting surface 13, and is incident from the incident end surfaces 10 a and 10 b over the entire surface of the light emitting surface 11, and is reflected by the reflecting surface 13. A plurality of dot-like lens portions 12 that collect the light that is reflected and emitted from each portion of the emission surface 11 are integrally formed at a pitch that is the same as or smaller than the pixel pitch of the liquid crystal display element 1. .

  Each of the first and second light emitting elements 15a and 15b includes a red LED, a green LED, and a blue LED, and light of three colors of red, green, and blue is selected by selectively lighting these LEDs. A plurality of solid-state light emitting elements that emit light, and a plurality of light emitting plates 9 are arranged opposite to the two incident end faces 10a and 10b of the light guide plate 9 at intervals in the length direction of the incident end faces 10a and 1b. Yes.

  Further, the surface light source 8 includes optical means 16 that is disposed on the light exit surface 11 side of the light guide plate 9 and adjusts the spread angle of light emitted from the light exit surface 11 of the light guide plate 9.

  The optical means 16 includes, on one surface of a transparent resin film, a plurality of elongated prism portions 17 parallel to the length direction (width direction of the light guide plate 9) of the incident end faces 10a and 10b of the light guide plate 9. The light guide plate 9 is composed of a prism sheet formed at a pitch approximately equal to the pitch of the plurality of dot-like lens portions 12 on the emission surface 11, and one surface thereof, for example, the formation surface of the elongated prism portion 17 is used as the light guide plate. 9 are arranged so as to oppose the emission surface 11. Hereinafter, the optical means 16 is referred to as a prism sheet.

  The surface light source 8 has the prism sheet 16 opposed to the liquid crystal display element 1 on the side opposite to the observation side of the liquid crystal display element 1, and the arrangement side of the first light emitting element 15a is the observation side. The second light emitting element 15b is disposed on the right side when viewed from the side, and is disposed on the left side when viewed from the observation side.

  The surface light source 8 emits light from the first light emitting element 15 a and enters the light guide plate 9 from one incident end face 10 a and the second light emitting element 15 b to the light guide plate 9. The light incident from the other incident end face 10b is reflected by the reflecting surface 13 of the light guide plate 9 toward the output surface 11 of the light guide plate 9, and the light is reflected from the output surface 11 of the light guide plate 9. The light is condensed and emitted by a plurality of dot-shaped lens portions 12 formed on the emission surface 11, and further, the light spread angle is adjusted by the prism sheet 16 and irradiated toward the liquid crystal display element 1. Yes, when the first light emitting element 15a is turned on, from the direction opposite to the arrangement side of the first light emitting element 15a with respect to the normal direction of the liquid crystal display element 1, that is, from the observation side of the liquid crystal display element 1. Look left The liquid crystal display element 1 is irradiated with first illuminating light having directivity in which the peak of the emitted light intensity exists in the direction in which the light is emitted, and when the second light emitting element 15b is turned on, the liquid crystal display element 1 is turned on. A second directivity in which the peak of the emitted light intensity exists in a direction opposite to the arrangement side of the second light emitting element 15b with respect to the normal direction, that is, in a direction inclined to the right as viewed from the observation side. Is emitted toward the liquid crystal display element 1.

  FIG. 3 is an intensity distribution diagram of the first and second illumination lights irradiated from the surface light source 8 toward the liquid crystal display element 1. In the figure, the positive angle indicates the method of the liquid crystal display element 1. The right inclination angle and the negative angle with respect to the linear direction (the direction of 0 °) are the left inclination angle with respect to the normal direction.

  As shown in FIG. 3, the surface light source 8 has directivity in which the peak of the emitted light intensity exists in a direction inclined about 5 ° to the left as viewed from the observation side with respect to the normal direction of the liquid crystal display element 1. And a second illumination having directivity in which a peak of emitted light intensity exists in a direction inclined about 5 ° to the right when viewed from the observation side with respect to the normal direction. Light is irradiated toward the liquid crystal display element 1.

  That is, in the liquid crystal display device, the normal line of the liquid crystal display element 1 is irradiated from the liquid crystal display element 1 by the irradiation of the first illumination light from the surface light source 8 as indicated by an arrow line in FIG. The first image light A having directivity in the direction inclined to the left as viewed from the observation side with respect to the direction is emitted, and the liquid crystal is emitted by the irradiation of the second illumination light from the surface light source 8. As shown by the broken line in FIG. 2, a second directivity having a directivity from the display element 1 toward the right direction when viewed from the observation side with respect to the normal direction of the liquid crystal display element 1. The image light B is emitted.

  FIG. 4 shows the peak directions of the light intensities of the first image light A and the second image light B emitted from the liquid crystal display element 1, and the surface light source 8 has the intensity distribution shown in FIG. In order to emit the first and second illumination light, the peak of the light intensity of the first image light A emitted from the liquid crystal display element 1 when the first illumination light is irradiated from the surface light source 8. The direction is a direction inclined about 5 ° to the left as viewed from the viewing side with respect to the normal line O of the liquid crystal display element 1, and the liquid crystal display when the second illumination light is irradiated from the surface light source 8. The peak direction of the light intensity of the second image light B emitted from the element 1 is a direction inclined about 5 ° to the right when viewed from the observation side with respect to the normal line O of the liquid crystal display element 1.

  As shown in FIG. 4, the liquid crystal display device is designed such that the display viewing distance of the liquid crystal display element 1 is 35 cm, and the distance between the left and right eyes of the display observer M is 6.5 cm. The first image light A emitted from the liquid crystal display element 1 is seen by the left eye of the observer M when viewed from the direction within an angle range of ± about 5 ° in the left-right direction with respect to the normal line O of the element 1. The second image light B observed and emitted from the liquid crystal display element 1 is observed by the right eye of the observer M, and both of the image lights A and B look like one image.

  On the other hand, the first image light A is observed by the left and right eyes of the observer M when viewed from a direction tilted to the left of the angle range with respect to the normal line O of the liquid crystal display element 1. When viewed from a direction tilted to the right of the normal range O with respect to the angle range, the second image light B is observed by the left and right eyes of the observer M. The image viewed from the direction tilted leftward and rightward is one of the first and second image lights A and B.

  In addition, the liquid crystal display device sequentially supplies gate signals to the plurality of gate lines of the liquid crystal display element 1 and supplies data signals to the plurality of data lines in synchronization with the plurality of pixels. Drive means 18 comprising a display element drive section for writing image data to the light source drive section and a light source drive section for turning on the first light-emitting element 15a and the second light-emitting element 15b of the surface light source 8. 18 to drive.

The driving means 18 is composed of a narrow viewing angle and a narrow viewing angle drive system for displaying a wide viewing angle drive system for displaying a wide viewing angle.

  The liquid crystal display device is mounted on a display unit of an electronic device such as a mobile phone, and the driving means 18 has, for example, a narrow viewing angle and a wide viewing angle by a viewing angle selection key provided on the electronic device. When the narrow viewing angle is selected according to the selection of the viewing angle, the liquid crystal display element 1 and the surface light source 8 are driven by the narrow viewing angle driving system, and when the wide viewing angle is selected, the wide viewing angle is selected. The liquid crystal display element 1 and the surface light source 8 are driven by a viewing angle driving system.

First, a driving method for causing the liquid crystal display device to perform narrow viewing angle display will be described. At this time, the narrow viewing angle driving system of the driving unit 18 causes the plurality of pixels of the liquid crystal display element 1 to have the above-described operation. Among the plurality of areas obtained by dividing the screen area 1a of the liquid crystal display element 1 into a plurality of original image data corresponding to each of the plurality of pixels for displaying one image in the entire screen area of the liquid crystal display element 1. First selected image data in which data to be written to each pixel in the selected first area is selected, and each pixel in another area of the screen, that is, in a second area other than the first area and a second selected image data selected for writing data, selectively sequentially writing, in synchronism with the writing of the first selected image data, from the surface light source 8, the first light emitting element 15a When the liquid crystal Irradiating the first illumination light having directivity toward one direction with respect to the normal direction of the display element, that is, the direction inclined to the left direction, in synchronization with the writing of the second selected image data, A second directivity from the surface light source 8 toward the direction opposite to the one direction with respect to the normal direction, that is, the direction inclined rightward, by turning on the second light emitting element 15b. Irradiate with illumination light.

  In this embodiment, the screen area 1a of the liquid crystal display element 1 is composed of a plurality of areas a and b divided into a plurality of intersecting directions, for example, a horizontal direction and a vertical direction of the screen as shown in FIG. Yes.

And, in this driving method, the multiple pixels of the liquid crystal display device 1, a pre-SL solution crystal display device 1 of the screen area 1a horizontal direction and the vertical direction a plurality of areas divided into a, of b, and a checkered pattern First selected image data in which data to be written in each pixel in the plurality of selected first areas a is selected, and data to be written in each pixel in the second area b other than the first area. a second image data selected, selectively so that writing.

In this driving method, a first frame for displaying an image corresponding to the first selected image data, and a second frame for displaying an image corresponding to the second selected image data, Are divided into three fields, and the red, green, and blue unit color data of the first selected image data and the red, green, and blue units of the second selected image data for each field. Color data is selectively written to a plurality of pixels of the liquid crystal display element 1, and each of the write fields of the unit color data of the first selected image data has a color corresponding to the unit color of the write data of that field. 1 of the illumination light is irradiated from the surface light source 8, the respective write field of each unit color data of the second selected image data, a second irradiation of colors corresponding to the unit color of the write data in that field Light and so as to irradiate from the surface light source 8.

FIG. 6 is a driving sequence diagram in the case of narrow viewing angle display. In this embodiment, each field F11, F12, which is obtained by dividing the first frame for displaying an image corresponding to the first selected image data into three. Of F13, the red unit color data of the first selected image data is written to the plurality of pixels of the liquid crystal display element 1 in the first field F11, and the red first illumination light is written to the surface light source after the writing. 8, green unit color data of the first selected image data is written to a plurality of pixels of the liquid crystal display element 1 in the second field F12, and after the writing, the first illumination light of green is applied to the surface The blue unit color data of the first selected image data is written to the plurality of pixels of the liquid crystal display element 1 in the third field F13, and after the writing, the blue first illumination light is emitted from the light source 8 Illuminated from surface light source 8 It is allowed, of the second selected each have second frame divided into three parts to display an image corresponding to the image data field F21, F22, F 23, the first field F21, the red second selected image data Are written in a plurality of pixels of the liquid crystal display element 1, and after the writing, red second illumination light is irradiated from the surface light source 8, and the second field F22 is filled with the second selected image data . Green unit color data is written to a plurality of pixels of the liquid crystal display element 1, and after the writing, green second illumination light is emitted from the surface light source 8, and the second selected image data is displayed in a third field F23. Blue unit color data is written to a plurality of pixels of the liquid crystal display element 1, and after the writing, blue second illumination light is emitted from the surface light source 8.

In this driving method, a first region selected from a plurality of regions obtained by dividing the screen region 1a of the liquid crystal display element 1 into a plurality of pixels of the original image data to a plurality of pixels of the liquid crystal display element 1. First selected image data that selects data to be written to each pixel in a, and data to be written to each pixel in a second region b other than the first region a in the plurality of regions the second selected image data, selectively sequentially writing said in synchronism with the writing of the first selected image data, in the left direction with respect to the normal direction of the liquid crystal display element 1 from the surface light source 8 The first illumination light having directivity in the inclined direction is irradiated, and the first illumination light is inclined rightward from the surface light source 8 in synchronization with the writing of the second selected image data. Irradiate the second illumination light with directivity toward the direction Therefore, the first image is missing from the liquid crystal display device from the front direction (the direction near the normal line of the liquid crystal display element 1) in which a plurality of portions corresponding to the first selected image data are missing. An image supplemented by a second image lacking a plurality of portions corresponding to the second selected image data, that is, an image corresponding to the original image data, from the direction inclined to the direction and the opposite direction, it is possible to perform display of images in which the first plurality of portions corresponding to one of the second selected image data is lost is observed.

  FIG. 5 shows the display when viewed from the front direction and the direction tilted leftward and rightward with respect to the frontal direction when the narrow viewing angle is displayed. As described above, since both the first image light A and the second image light B emitted from the liquid crystal display element 1 look like one image, a partial lack of display corresponding to the original image data is obtained. You can see the image without any.

  On the other hand, when viewed from the direction tilted leftward and rightward with respect to the front direction, as described above, one of the first and second image lights A and B, that is, An unrecognizable image with a plurality of missing parts is visible.

Therefore, according to this driving method, display information is displayed on the liquid crystal display device from one direction with respect to the front direction and the direction inclined in the opposite direction without using a liquid crystal element for viewing angle restriction that is difficult to manufacture. it is possible to perform the Na has a narrow viewing angle display can be recognized.

Furthermore, in this driving method, the screen area 1a of the liquid crystal display element 1 is divided into a plurality of directions intersecting each other, and a plurality of the plurality of divided areas a and b selected in a checkered pattern are used. First selected image data that selects data to be written to each pixel in the first area a, and second that selects data to be written to each pixel in the second area b other than the first area. because it and the selected image data, the selectively writing such a display as viewed from the inclined leftward and rightward directions, a plurality of parts is missing in a checkered pattern, recognition more difficult display be able to.

  In the driving sequence in the narrow viewing angle display shown in FIG. 6, the fields F11, F12, and F13 obtained by dividing the first frame for displaying the image corresponding to the first selected image data into three are continuously displayed. The fields F21, F22, and F23 obtained by dividing the second frame for displaying the image corresponding to the second selected image data into three are continuous, but the fields F11, F12, F13, F21, For example, as shown in the other sequence diagram shown in FIG. 7, F22 and F23 are the first field F11 of the first frame, the first field F21 of the second frame, the second field F12 of the first frame, and the second frame F2, respectively. The second field F22, the third field F13 of the first frame, and the third field F23 of the third frame may be rearranged.

  Next, a driving method when the liquid crystal display device performs a wide viewing angle display will be described. FIG. 8 is a driving sequence diagram when the wide viewing angle display is performed. A period corresponding to the total time of the first and second frames at the time of viewing angle display is defined as one frame, and among the fields F1, F2, and F3 obtained by dividing the one frame into three, the first field F1 includes the original field F1. Red unit color data of image data is written to a plurality of pixels of the liquid crystal display element 1, and after the writing, red first illumination light and second illumination light are simultaneously irradiated from the surface light source 8, and second In the field F2, green unit color data of the original image data is written to a plurality of pixels of the liquid crystal display element 1, and after the writing, green first illumination light and second illumination light are transmitted from the surface light source 8. At the same time, In the field F3, blue unit color data of the original image data is written to a plurality of pixels of the liquid crystal display element 1, and after the writing, blue first illumination light and second illumination light are transmitted from the surface light source 8. Irradiate at the same time.

  Therefore, when the wide viewing angle display is performed, an image corresponding to the original image data is displayed both when viewed from the front direction and when viewed from the direction inclined to the left and right with respect to the front direction. appear.

(Second Embodiment)
The driving method of the first embodiment is a method of driving a field sequential liquid crystal display device. However, the present invention provides a red, green and blue color filter provided with red, green and blue color filters. Driving a liquid crystal display device having a liquid crystal display element having a plurality of pixels of each color and a surface light source that selectively irradiates the liquid crystal display element with the first illumination light and the second illumination light made of white light It can also be applied to.

  FIG. 9 shows a second embodiment of the present invention, in which a liquid crystal display element having a plurality of pixels of red, green, and blue, and first and second illumination light composed of white light are selectively used. FIG. 4 is a driving timing chart when a liquid crystal display device provided with a surface light source for irradiation performs narrow viewing angle display. In this driving method, the liquid crystal display displays first selection image data and second selection image data, respectively. In order to display image data on a plurality of pixels of the liquid crystal display element on the liquid crystal display element as image data composed of red, green, and blue color data corresponding to the red, green, and blue pixels of the element. Among the original image data, the first selected image data selected as the data to be written in each pixel in the selected first region among the plurality of regions obtained by dividing the screen region of the liquid crystal display element into a plurality of regions. A first frame for displaying the corresponding image First selected image data composed of three color data of red, green and blue is written to a plurality of pixels of the liquid crystal display element, and a second region other than the first region among the plurality of regions A second selected image composed of color data of three colors of red, green and blue in a second frame for displaying an image corresponding to the second selected image data in which data to be written in each pixel is selected Data is written to a plurality of pixels of the liquid crystal display element. In the first frame, a first white light is emitted from the surface light source 8 by simultaneously lighting red, green, and blue LEDs of the first light emitting element 15a. The second frame is irradiated with white second illumination light from the surface light source 8 by simultaneously lighting the red, green, and blue LEDs of the second light emitting element 15b. I am doing so.

According to this driving method, a liquid crystal display device including a liquid crystal display element having three color filters of red, green, and blue is subjected to the first operation from the front direction (direction near the normal line of the liquid crystal display element). An image in which a missing portion of the first image lacking a plurality of portions corresponding to one selected image data is supplemented by a second image lacking a plurality of portions corresponding to the second selected image data, that is, An image corresponding to the original image data is observed, and the first and second selections are made from a direction inclined in one direction (for example, the left direction) and the opposite direction (for example, the right direction) with respect to the front direction. it is possible to perform display of images in which a plurality of portions corresponding to one of the image data is lost is observed, without using the difficult viewing angle limiting liquid crystal device manufacture, the liquid crystal display device, One of the front direction From direction and the direction thereof inclined in the opposite direction can be performed can be Na has a narrow viewing angle display to recognize the display information.

  A liquid crystal display device including a liquid crystal display element having a plurality of pixels of each color of red, green, and blue, and a surface light source that selectively irradiates first illumination light and second illumination light composed of white light. When the wide viewing angle display is performed, both the white first and second illumination lights are continuously irradiated from the surface light source 8, and the first and second frames in the narrow viewing angle display are continuously emitted. For each frame corresponding to the total time, the original image data (image data composed of color data of three colors of red, green, and blue) may be written in a plurality of pixels of the liquid crystal display element. At the time of display, an image corresponding to the original image data can be seen both when viewed from the front direction and when viewed from left and right directions with respect to the front direction.

(Other embodiments)
Further, in the above-described embodiment, the screen area 1a of the liquid crystal display element 1 is divided into a plurality of directions in two directions intersecting each other, and each of the divided areas is selected in a checkered area. a first selected image data selected the data to be written to a pixel, selectively to a second selected image data selected data to be written to each pixel of the first second region other than the region For example, the first selection image data and the second selection image data are written to each pixel in a plurality of first regions arranged in a stripe shape among the plurality of divided regions. The image data may be image data in which data to be written is selected and image data in which data to be written in each pixel in the second area other than the first area is selected.

1 is a perspective view of a liquid crystal display device showing a first embodiment of the present invention. The top view of the said liquid crystal display device. The intensity distribution of the 1st and 2nd illumination light irradiated toward a liquid crystal display element from the surface light source of the said liquid crystal display device. The figure which shows the peak direction of the light intensity of the 1st image light radiate | emitted from the said liquid crystal display element, and a 2nd image light. The figure which shows the display seen from the direction inclined in the left direction and the right direction with respect to the front direction at the time of narrow viewing angle display, and the said front direction. The drive sequence figure at the time of a narrow viewing angle display. The other drive sequence figure at the time of a narrow viewing angle display. The drive sequence figure at the time of wide viewing angle display. The drive timing diagram at the time of the narrow viewing angle display which shows the 2nd Example of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display element, 1a ... Screen area | region, 8 ... Surface light source, 9 ... Light guide plate, 15a, 15b ... Light emitting element, A ... 1st illumination light, B ... 2nd illumination light.

Claims (3)

A liquid crystal display device having a screen area in which a plurality of pixels in a matrix that controls the transmittance of light, the the observation side of the liquid crystal display element is disposed on the opposite side, in different directions toward the liquid crystal display device a surface light source for illuminating the two illumination light having a directivity, in the driving method of the liquid crystal display device provided with,
The liquid crystal display element, wherein among the original image data corresponding to each of the plurality of pixels for displaying one image in the entire screen area of the liquid crystal display device, a plurality of regions obtained by dividing the screen area into a plurality First selected image data for selecting data to be written in each pixel in a plurality of first areas selected in a checkered pattern, and a second of the plurality of areas other than the first area second selected image data and the time-divisionally switched and outputs the selected data to be written to each pixel in the area, in synchronization with the output of the first selected image data, said from the surface light source liquid without irradiating the first Rutotomoni below the second illumination light is irradiated with illumination light having a directivity toward a direction inclined in one direction with respect to the normal direction of the display device, said second selected image in synchronism with the output of the data, before the said surface light source The liquid crystal display of the said one direction with respect to the normal direction, characterized in that not irradiated with the first illumination light causes illuminated the second illumination light having a directivity toward a direction inclined in opposite directions Device driving method. Red, green, said each unit color blue first illumination light and the red, green, towards the said second illumination light of the respective unit color blue selectively the liquid crystal display device in the unit for each color comprising the surface light source for illuminating,
Each of the first selected image data and the second selected image data is made red, green, from the respective unit color data of blue,
A first frame for displaying an image corresponding to the first selected image data, a second frame for displaying an image corresponding to the second selected image data, into three fields, respectively For each divided field, the red, green and blue unit color data of the first selected image data and the red, green and blue unit color data of the second selected image data are switched in a time division manner. output to the liquid crystal display element Te,
Wherein each write field of each unit color data of the first selected image data, Rutotomoni by irradiating the first illumination light having color unit colors light corresponding to the unit color of the output data of the field from the surface light source the second without irradiating the illumination light, the each write field of each unit color data of the second selected image data, the said second illumination light color corresponding to the unit color of the output data of the field 2. The method for driving a liquid crystal display device according to claim 1, wherein the first illumination light is not irradiated while being irradiated from a surface light source. Red, green, red color filter of each color is provided in the blue, green, and the liquid crystal display device having a plurality of pixels of each color of blue, the said a white light first illumination light second illumination light the time division switchable includes the surface light source for irradiating the liquid crystal display device,
Each of the first selected image data and the second selected image data becomes red liquid crystal display element, green, red, corresponding to each pixel of the blue, green, from the color data of three colors of blue,
A first frame for displaying an image corresponding to the first selected image data, and outputs the red of the first selected image data, green, color data of three colors of blue liquid crystal display element , output to the second frame for displaying an image corresponding to the second selected image data, red the second selected image data, green, color data of three colors of blue liquid crystal display element And
In the first frame, without irradiating the white first illumination light is allowed Rutotomoni the second irradiating illumination light from the surface light source, the second frame, white the second from the surface light source 2. The method of driving a liquid crystal display device according to claim 1, wherein the second illumination light is irradiated and the first illumination light is not irradiated .

Images