JP4720408B2 - Method for driving liquid crystal display element and liquid crystal display device - Google Patents

Description

  The present invention relates to a driving method of a liquid crystal display element and a liquid crystal display device capable of performing a high security narrow viewing angle display without fear of being peeped by others other than an observer.

  Since the liquid crystal display element has a wide viewing angle, the display may be peeped by others from a direction inclined with respect to the front direction (direction near the normal line of the liquid crystal display element).

  Therefore, on one surface side of the liquid crystal display element, a viewing angle limiting element in which the liquid crystal molecules are aligned in different alignment states for each of the divided areas obtained by dividing the area corresponding to the screen of the liquid crystal display element into a plurality of areas. A liquid crystal display device has been proposed in which the viewing angle of the liquid crystal display element is limited by the viewing angle limiting element (see Patent Document 1).

  The viewing angle limiting element is a normal direction of the liquid crystal display element for each divided area obtained by dividing the liquid crystal molecules of the liquid crystal layer sealed between a pair of substrates into a plurality of areas corresponding to the screen of the liquid crystal display element. The inner surfaces of the pair of substrates facing each other are aligned in an orientation state having a viewing angle in a direction inclined to one direction and an orientation state having a viewing angle in a direction inclined in a direction opposite to the direction. Each of them has a configuration in which electrodes having a predetermined shape are provided so as to correspond to the respective divided regions.

  The liquid crystal display device is configured to limit 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 element. When no voltage is applied between the electrodes of the angle limiting element, that is, when the viewing angle limiting element is in a non-display state, the 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 element, the display of the liquid crystal display element is seen when viewed from a direction inclined in one direction with respect to the front direction and a direction inclined in the opposite direction. An image is displayed on each segmented region having a viewing angle in a direction tilted in one direction of the viewing angle limiting element and on the electrode of the predetermined shape in each segmented region having a viewing angle in the opposite direction. Since it is hidden by the corresponding display, 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, and the display The viewing angle of the image is narrowed.
JP 2000-133334 A

  However, in the above conventional liquid crystal display device, the liquid crystal molecules of the liquid crystal layer of the viewing angle limiting element are aligned on the inner surfaces of the pair of substrates of the viewing angle limiting element in order to align the liquid crystal molecules in different alignment states for the respective divided regions. In this case, a complicated alignment process (rubbing process for the alignment film) with different directions must be performed for each of the divided regions, which makes it difficult to manufacture the viewing angle limiting element and increases the cost. Yes.

  The present invention provides a driving method of a liquid crystal display element and a liquid crystal display device capable of performing a high security narrow viewing angle display without fear of being peeped by others and reducing the cost. It is aimed at.

  The method for driving a liquid crystal display element according to the present invention is the method of the liquid crystal display element in a liquid crystal display element having a screen region in which a plurality of pixels for controlling the transmission of light are arranged in a matrix from the opposite side to the observation side. A first illumination light having a directivity having a peak of emitted light intensity in a direction inclined in one direction with respect to the line direction and a direction inclined in a direction opposite to the one direction with respect to the normal line A light source that selectively irradiates the second illumination light having a directivity having a peak of the emitted light intensity, and the image data includes a plurality of pixel data supplied to the plurality of pixels of the liquid crystal display element. , Each pixel data corresponding to each pixel in the selected first area among a plurality of areas obtained by dividing the screen area into a plurality of areas, and each in the second area other than the first area Pre-defined tone between white and black corresponding to the pixel First divided image data including specified halftone data is applied to a plurality of pixels of the liquid crystal display element, and the first divided image data is applied from the light source in synchronization with application of the first divided image data to the pixels. Irradiating the first illumination light, among the image data, each pixel data corresponding to each pixel in the second region, and white and black corresponding to each pixel in the first region Second divided image data including the halftone data in which a predetermined gradation is specified is applied to a plurality of pixels of the liquid crystal display element, and the second divided image data is applied to each pixel. The second illumination light is irradiated from the light source in synchronization with the application.

  In this driving method, among image data composed of a plurality of pixel data supplied to a plurality of pixels of the liquid crystal display element, a checkered pattern out of a plurality of areas obtained by dividing the screen area of the liquid crystal display element into a lattice shape Each pixel data corresponding to each pixel in the first area selected in the above, and white corresponding to each pixel in the second area other than the first area selected in the checkered pattern First divided image data including halftone data in which a predetermined gradation between black is designated is applied to a plurality of pixels of the liquid crystal display element, and each pixel of the first divided image data is applied to the pixels. The first illumination light is irradiated from the light source in synchronization with the application of each of the pixel data corresponding to each pixel in the second region of the image data, and the first selected in a checkered pattern. Between white and black corresponding to each pixel in one area Second divided image data composed of the halftone data for which the specified gradation is specified is applied to a plurality of pixels of the liquid crystal display element, and the second divided image data is applied to the pixels. It is preferable that the second illumination light is emitted from the light source in synchronization.

  Further, in this driving method, a plurality of regions obtained by dividing the image data supplied to the plurality of pixels of the liquid crystal display element into stripes along one of two directions intersecting the screen region of the liquid crystal display element. A second partial area consisting of an area other than the first partial area by giving a predetermined gradation value between white and black to each pixel in the first partial area selected every other one of the pixels A first partial filter that passes pixel data corresponding to each of the pixels, and one of a plurality of regions obtained by dividing the screen region of the liquid crystal display element into stripes along the other of the two directions intersecting each other A predetermined gradation value between white and black is given to each pixel in the third partial area selected every other area, and each pixel in the fourth partial area composed of areas other than the third partial area is assigned to each pixel in the third partial area. Second to pass the corresponding pixel data One first divided image data processed by applying a first data processing filter including a partial filter is applied to a plurality of pixels of the liquid crystal display element, and the first divided image data is applied to each pixel. The first illumination light is irradiated from the light source in synchronization with application, the image data is passed through pixel data corresponding to each pixel in the first partial area, and the second partial area is A third partial filter that gives a predetermined gradation value between white and black to each pixel; and pixel data corresponding to each pixel in the third partial area; Second divided image data processed by applying a second data processing filter including a fourth partial filter that gives a predetermined gradation value between white and black to each pixel is a plurality of pixels of the liquid crystal display element Applied to the second divided image data. Preferably said data in synchronization with the application of the respective pixels from the light source to be irradiated with said second illumination light.

The liquid crystal display device of the present invention is
A liquid crystal display element having a screen region in which a plurality of pixels for controlling light transmission are arranged in a matrix, and
The liquid crystal display element is disposed on the side opposite to the observation side, and has a peak of emitted light intensity in a direction inclined in one direction with respect to the normal direction of the liquid crystal display element toward the liquid crystal display element. The first illuminating light having directivity and the second illuminating light having directivity having a peak of emitted light intensity in a direction inclined in a direction opposite to the one direction with respect to the normal line are selectively used. A surface light source that illuminates
Among the image data supplied to the plurality of pixels of the liquid crystal display element, each pixel in the selected first area among the plurality of areas obtained by dividing the screen area of the liquid crystal display element is between white and black. The first divided image data processed by applying a first data processing filter that gives a predetermined gradation value and passes pixel data of each pixel corresponding to the second region other than the first region. Is applied to a plurality of pixels of the liquid crystal display element, and the first illumination light is irradiated from the light source in synchronization with the application of the write signal, and is synchronized with the irradiation of the second illumination light. Second data processing for passing each pixel data corresponding to each pixel in the first area and giving each pixel corresponding to the second area a predetermined gradation value between white and black To the second divided image data processed by filtering Applying Flip and the write signal into a plurality of pixels of the liquid crystal display device, characterized by comprising a driving means for irradiating a synchronously the second illumination light from the light source to the application of the write signal.

  In the liquid crystal display device, the driving unit simultaneously irradiates the first illumination light and the second illumination light from the surface light source, and causes the plurality of pixels of the liquid crystal display element to perform the first and second illumination. It is desirable to provide means for applying a write signal corresponding to non-processed image data without applying a data processing filter.

  In the liquid crystal display element driving method of the present invention, the emission light intensity peak is applied to the liquid crystal display element from the side opposite to the observation side in a direction inclined in one direction with respect to the normal direction of the liquid crystal display element. First illuminating light having directivity and second illuminating light having directivity having a peak of emitted light intensity in a direction inclined to the direction opposite to the one direction with respect to the normal line. A light source for selectively irradiating, and among image data composed of a plurality of pixel data supplied to a plurality of pixels of the liquid crystal display element, a selected first of a plurality of regions obtained by dividing the screen region into a plurality of regions Each pixel data corresponding to each pixel in one area and a predetermined gradation between white and black corresponding to each pixel in the second area other than the first area are designated. The first divided image data composed of halftone data is displayed on the liquid crystal display. Applying the first illumination light from the light source in synchronization with the application of the first divided image data to the pixels, and applying the second divided image data to the second pixel of the image data. Second pixel data comprising pixel data corresponding to each pixel in the region and halftone data in which a predetermined gradation between white and black is designated corresponding to each pixel in the first region. By applying the divided image data to a plurality of pixels of the liquid crystal display element and irradiating the second illumination light from the light source in synchronization with the application of the second divided image data to the pixels, According to this driving method, the display image cannot be recognized from a direction inclined in one direction with respect to the front direction (direction near the normal line of the liquid crystal display element) and a direction inclined in the opposite direction. If the direction is inclined with respect to the front direction Can be performed fear without high security narrow viewing angle display is peeping by others, yet it is possible to reduce the cost.

  In this driving method, among image data composed of a plurality of pixel data supplied to a plurality of pixels of the liquid crystal display element, a checkered pattern out of a plurality of areas obtained by dividing the screen area of the liquid crystal display element into a lattice shape Each pixel data corresponding to each pixel in the first area selected in the above, and white corresponding to each pixel in the second area other than the first area selected in the checkered pattern First divided image data including halftone data in which a predetermined gradation between black is designated is applied to a plurality of pixels of the liquid crystal display element, and each pixel of the first divided image data is applied to the pixels. The first illumination light is emitted from the light source in synchronization with the application of each of the pixel data corresponding to each pixel in the second region of the image data, and the first selected in a checkered pattern. Between white and black corresponding to each pixel in the area Second divided image data composed of the halftone data for which the specified gradation is specified is applied to a plurality of pixels of the liquid crystal display element, and is synchronized with the application of the second divided image data to the pixels. It is preferable to irradiate the second illumination light from the light source, and in this way, from the direction inclined in one direction with respect to the front direction and the direction inclined in the opposite direction, display is performed. It is possible to perform a narrower viewing angle display with higher security, in which an image is hidden by a checkered pattern and cannot be recognized.

  Further, in this driving method, a plurality of regions obtained by dividing the image data supplied to the plurality of pixels of the liquid crystal display element into stripes along one of two directions intersecting the screen region of the liquid crystal display element. A second partial area consisting of an area other than the first partial area by giving a predetermined gradation value between white and black to each pixel in the first partial area selected every other one of the pixels A first partial filter that passes pixel data corresponding to each of the pixels, and one of a plurality of regions obtained by dividing the screen region of the liquid crystal display element into stripes along the other of the two directions intersecting each other A predetermined gradation value between white and black is given to each pixel in the third partial area selected every other area, and each pixel in the fourth partial area composed of areas other than the third partial area is assigned to each pixel in the third partial area. Second to pass the corresponding pixel data One first divided image data processed by applying a first data processing filter including a partial filter is applied to a plurality of pixels of the liquid crystal display element, and the first divided image data is applied to each pixel. The first illumination light is irradiated from the light source in synchronization with application, the image data is passed through pixel data corresponding to each pixel in the first partial area, and the second partial area is A third partial filter that gives a predetermined gradation value between white and black to each pixel; and pixel data corresponding to each pixel in the third partial area; Second divided image data processed by applying a second data processing filter including a fourth partial filter that gives a predetermined gradation value between white and black to each pixel is a plurality of pixels of the liquid crystal display element Applied to the second divided image data. It is preferable to irradiate the second illumination light from the light source in synchronism with the application to the respective pixels, and in this way, a direction inclined in one direction with respect to the front direction and its From a direction inclined in the opposite direction, the display image is hidden by a checkered pattern made up of a plurality of patterns with different gradations and cannot be recognized, and a narrower viewing angle display with higher security can be performed.

  The drive-type liquid crystal display device of the present invention is disposed on the opposite side of the liquid crystal display element and the observation side of the liquid crystal display element, and is directed toward the liquid crystal display element with respect to the normal direction of the liquid crystal display element. The first illumination light having the directivity having the peak of the emitted light intensity in the direction inclined in one direction and the peak of the emitted light intensity in the direction inclined in the direction opposite to the one direction with respect to the normal line. Of the surface light source that selectively irradiates the second illumination light having directivity and the image data supplied to the plurality of pixels of the liquid crystal display element, the screen area of the liquid crystal display element is divided Each pixel corresponding to a second region other than the first region is given a predetermined gradation value between white and black to each pixel in the selected first region of the plurality of regions Is processed by applying a first data processing filter that passes the pixel data of A write signal corresponding to the first divided image data is applied to a plurality of pixels of the liquid crystal display element, the first illumination light is irradiated from the light source in synchronization with the application of the write signal, and the second Each pixel data corresponding to each pixel in the first area is passed in synchronization with the illumination light irradiation, and a predetermined gradation value between white and black is set to each pixel corresponding to the second area. A write signal corresponding to the second divided image data processed by applying a second data processing filter is applied to a plurality of pixels of the liquid crystal display element, and the light source emits the first signal in synchronization with the application of the write signal. The liquid crystal display element can be driven by the driving method, and thus has high security without fear of being peeped by others. Narrow vision It can be performed angular display, moreover the cost can be reduced.

  In this drive type liquid crystal display device, the driving means simultaneously irradiates the first illumination light and the second illumination light from the surface light source, and causes the plurality of pixels of the liquid crystal display element to have the first and first illumination light. It is desirable to have a means for applying a write signal corresponding to non-processed image data without applying a data processing filter as described above. By doing so, the narrow viewing angle display and the wide viewing angle display are selected. Can be done automatically.

(First embodiment)
FIG. 1 is a plan view of a liquid crystal display device according to a first embodiment of the present invention. This liquid crystal display device has a wide viewing angle having a screen region in which a plurality of pixels for controlling light transmission are arranged in a matrix. The liquid crystal display element 1 is disposed on the opposite side of the liquid crystal display element 1 from the observation side (lower side in FIG. 1), and is directed toward the liquid crystal display element 1 with respect to the normal direction of the liquid crystal display element 1. First illuminating light L1 having directivity having a peak of emitted light intensity in a direction inclined in one direction, and emitted light in a direction inclined in a direction opposite to the one direction with respect to the normal. A surface light source 13 for irradiating the second illumination light L2 having directivity with an intensity peak and a driving means 16 for driving the liquid crystal display element 1 and the surface light source 13 are provided.

  FIG. 2 is an enlarged cross-sectional view of a part of the liquid crystal display element 1. The liquid crystal display element 1 is a pair of transparent substrates 2 joined via a frame-shaped sealing material 4 (see FIG. 1) surrounding the screen area. , 3, transparent electrodes 5, 6 that are provided on inner surfaces facing each other of the pair of transparent substrates 2, 3 and form a plurality of pixels arranged in a matrix by regions facing each other, and the pair of substrates 2, 2 3 includes a liquid crystal layer 10 sealed in a region surrounded by the sealing material 4 between three and a pair of polarizing plates 11 and 12 disposed on the outer surfaces of the pair of substrates 2 and 3, respectively.

  The liquid crystal display element 1 is provided with a plurality of pixel electrodes 5 arranged in a matrix in the row direction and the column direction on the inner surface of the one substrate 2, and the plurality of pixel electrodes 5 on the inner surface of the other substrate 3. 2 is an active matrix liquid crystal display element provided with a single film-like counter electrode 6 facing the array region, and is omitted in FIG. 2, but on the inner surface of the one substrate 2, the plurality of pixel electrodes 5 are provided. Are provided with an active element composed of TFTs connected to each of the TFTs, a plurality of gate wirings connected to the TFTs in each row, and a plurality of data wirings connected to the TFTs in each column.

  The liquid crystal display element 1 includes red, green, and blue color filters 7R, 7G, and 7B respectively corresponding to the plurality of pixels. The color filters 7R, 7G, and 7B include the color filters 7R, 7G, and 7B. The counter electrode 6 is formed on the substrate surface of the other substrate 3.

  Further, alignment films 8 and 9 are provided on the inner surfaces of the pair of substrates 2 and 3 so as to cover the electrodes 5 and 6, and the liquid crystal molecules of the liquid crystal layer 10 are disposed between the pair of substrates 2 and 3. In the alignment state defined by the alignment films 8 and 9.

  The liquid crystal display element 1 includes a TN or STN type in which liquid crystal molecules are twist-aligned, a vertical alignment type in which liquid crystal molecules are aligned substantially perpendicular to the surfaces of the substrates 2 and 3, and a substrate without twisting the liquid crystal molecules. The liquid crystal display element is either a horizontal alignment type that is aligned substantially parallel to two or three planes or a bend alignment type that bends liquid crystal molecules, or a ferroelectric or antiferroelectric liquid crystal display element. The pair of polarizing plates 11 and 12 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 10) is generated between the electrodes 5 and 6 provided on the inner surfaces of the pair of substrates 2 and 3, respectively. The liquid crystal display element is provided with, for example, comb-shaped first and second electrodes that form a plurality of pixels on the inner surface of one of a pair of substrates. A lateral electric field control type of changing the alignment state of liquid crystal molecules by generating a lateral electric field (electric field in a direction along the substrate surface) between the electrodes 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 13 is made of a plate-shaped transparent member having an area facing the entire screen area of the liquid crystal display element 1, and has two end faces corresponding to the left and right side edges of the screen of the liquid crystal display element 1. The light incident end face is formed on the plate surface facing the liquid crystal display element 1, and the light exit face is reflected on the opposite plate face to reflect the light incident from the incident end face. A plurality of light guide plates 14 each having a reflection surface to be emitted from the light guide plate 14 and two incident end surfaces of the light guide plate 14 are arranged opposite to each other, and emits white light toward the incident end surfaces. Solid light-emitting elements (for example, light-emitting elements that include a red LED, a green LED, and a blue LED and emit white light that is a mixture of the light emission colors of these LEDs) 15a and 15b.

  The surface light source 13 guides the light from the first and second solid state light emitting elements 15a and 15b by the light guide plate 14 and irradiates the liquid crystal display element 1 from the emission surface thereof. When viewed from the viewing side of the display element 1, the first solid state light emitting element 15 a disposed on the side corresponding to the right edge of the screen is turned on from the viewing side with respect to the normal direction of the liquid crystal display element 1. A first illumination light L1 having directivity having a peak of emitted light intensity in a direction tilted to the left as viewed (hereinafter referred to as left illumination light) L1 is irradiated, and the side corresponding to the left edge of the screen is irradiated. With the lighting of the arranged second solid state light emitting device 15b, the directivity having the peak of the emitted light intensity in the direction inclined rightward when viewed from the observation side with respect to the normal direction of the liquid crystal display device 1 is obtained. Second illumination light (hereinafter referred to as right illumination light) ) Irradiating L2.

  The driving means 16 for driving the liquid crystal display element 1 and the surface light source 13 sequentially supplies a gate signal to the plurality of gate wirings of the liquid crystal display element 1, and synchronizes with it to image the plurality of data wirings. A display element driving unit that supplies a write signal corresponding to data and applies the write signal to a plurality of pixels of the liquid crystal display element 1; a first solid-state light-emitting element 15a of the surface light source 13; A light source driving section for selectively lighting the element 15b.

  The driving unit 16 includes a first area selected from a plurality of areas obtained by dividing the screen area of the liquid crystal display element 1 among the image data supplied to the plurality of pixels of the liquid crystal display element 1. A predetermined gradation value between white and black is given to each pixel, and a first data processing filter that passes pixel data of each pixel corresponding to the second region other than the first region is applied. A write signal corresponding to the processed first divided image data is applied to a plurality of pixels of the liquid crystal display element 1, and the first illumination light is irradiated from the surface light source 13 in synchronization with the application of the write signal. In synchronism with the irradiation of the second illumination light, each pixel data corresponding to each pixel in the first region is passed, and each pixel corresponding to the second region is previously set between white and black. Apply a second data processing filter that gives a defined tone value Driving in which a write signal corresponding to the processed second divided image data is applied to a plurality of pixels of the liquid crystal display element, and the second illumination light is irradiated from the surface light source 13 in synchronization with the application of the write signal. It consists of a circuit.

  In this embodiment, the drive means 16 is a plurality of image data composed of a plurality of pixel data supplied to a plurality of pixels of the liquid crystal display element 1 and the screen area of the liquid crystal display element 1 is divided into a grid. Each pixel data corresponding to each pixel in the first area selected in a checkered pattern in each of the areas, and each in the second area other than the first area selected in the checkered pattern First divided image data composed of halftone data in which a predetermined gradation between white and black is designated corresponding to the pixel is applied to a plurality of pixels of the liquid crystal display element 1, and the first Each pixel data corresponding to each pixel in the second region of the image data is irradiated with the first illumination light from the surface light source 13 in synchronization with the application of the divided image data to each pixel. And each pixel in the first region selected in a checkered pattern Correspondingly, second divided image data composed of the halftone data in which a predetermined gradation between white and black is designated is applied to a plurality of pixels of the liquid crystal display element, and the second divided image is applied. The second illumination light is emitted from the surface light source 13 in synchronization with the application of data to the pixels.

  FIG. 3 is a conceptual diagram in which the image data, the first and second data processing filters, and the first and second divided image data are patterned, A is image data, and F1 is a first data processing filter. F2 are second data processing filters, A1 is first divided image data, and A2 is second divided image data.

  This example is an example in which a monochrome image is displayed on the liquid crystal display element 1, and the image data A shown in FIG. 3 includes a background data a for displaying a white background and a black display pattern (FIG. , The display data b for displaying the T character pattern).

  As shown in FIG. 3, each of the first data processing filter F1 and the second data processing filter F2 has two directions intersecting the screen area of the liquid crystal display element 1, for example, the horizontal direction (row direction) of the screen. ) And the vertical direction (column direction) of the screen, and pixel data corresponding to each of the divided areas is processed, and the first data processing filter F1 The pixel data corresponding to the filter unit Fa composed of a plurality of areas selected in a checkered pattern among the plurality of areas is converted to a predetermined gradation value between white and black, for example, gray between white and black. The pixel data corresponding to the data path portion Fb composed of a plurality of areas other than the plurality of areas selected in the checkered pattern is replaced with a plurality of areas other than the plurality of areas selected in the checkered pattern. Corresponding image Data as it is to pass. Further, the second data processing filter F2 passes the pixel data corresponding to the filter unit Fa as it is, and replaces the pixel data corresponding to the data path unit Fb with the gray gradation value between white and black.

  Therefore, the first divided image data A1 processed by applying the first data processing filter F1 to the image data A is written to each pixel in a plurality of regions arranged in a checkered pattern on the screen of the liquid crystal display element 1. The gradation value of the data to be incorporated is the gray gradation of the predetermined value, and the gradation value of the data to be written to the pixels in the other region is the data as the gradation of the background data a or the display data b of the image data A. The second divided image data A2 processed by applying the second data processing filter F2 to the image data A is data obtained by inverting the first divided image data A1.

  That is, the first divided image data A1 is given to the area corresponding to the background data a of the image data A by the white data Va portion of the gradation value of the background data a and the first data processing filter F1. The gray data Vc portions of the predetermined gradation values are arranged in a checkered pattern, and the black data Vb portion of the gradation values of the display data b and the gray data Vc are arranged in an area corresponding to the display data b of the image data A. Are divided in a checkered pattern, and the second divided image data A2 is in a region corresponding to the background data a of the image data A, the white data Va portion, and the second data processing filter. The gray data Vc portion having a predetermined gradation value given by F2 is arranged in a checkered pattern in a pattern obtained by inverting the first divided image data A1, and corresponds to the display data b of the image data A. To pass a data arranged in a checkered pattern in a pattern with the black data Vb part and the gray data Vc unit is inverted the first divided image data A1.

  In addition, the driving unit 16 simultaneously irradiates the left illumination light L1 and the right illumination light L2 from the surface light source 13, and causes the plurality of pixels of the liquid crystal display element 1 to perform the first and second data. Means for applying a write signal corresponding to non-processed image data A without applying the processing filters F1, F2 is provided.

  The liquid crystal display device is mounted on a display unit of an electronic device such as a mobile phone, and the driving means 16 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 in accordance with the selection of the viewing angle, the left illuminating light L1 and the right illuminating light L2 are selectively emitted from the surface light source 13 and synchronized with the liquid crystal display. Driving is performed by applying write signals corresponding to the first divided image data A1 and the second divided image data A2 to a plurality of pixels of the element 1, and when the wide viewing angle is selected, the surface light source 13 The left direction illumination light L1 and the right direction illumination light L2 are simultaneously irradiated, and a drive is performed to apply a write signal corresponding to the unprocessed image data A to a plurality of pixels of the liquid crystal display element 1. ing.

  The liquid crystal display device is disposed on the liquid crystal display element 1 and on the side opposite to the observation side, and is in one direction with respect to the normal direction of the liquid crystal display element 1, that is, leftward when viewed from the observation side. Left direction illumination light L1 having a directivity having a peak of emitted light intensity in a tilted direction, and a direction opposite to the one direction with respect to the normal line, that is, a right direction when viewed from the observation side. A surface light source 13 for selectively irradiating the liquid crystal display element 1 with right-directional illumination light L2 having directivity having a peak of emitted light intensity in the direction, and the driving means 16; 16, among the image data composed of the plurality of pixel data supplied to the plurality of pixels of the liquid crystal display element 1, the first selected from the plurality of areas obtained by dividing the screen area of the liquid crystal display element 1. For each pixel in the region The first divided image data processed by applying the first data processing filter F1 that gives a predetermined gradation value and passes the pixel data of each pixel corresponding to the second area other than the first area is passed through A corresponding write signal is applied to a plurality of pixels of the liquid crystal display element 1, and the left illumination light L1 is emitted from the surface light source 13 in synchronization therewith, and each of the pixels corresponding to each pixel in the first region is irradiated. According to the second divided image data processed by applying a second data processing filter that passes pixel data and gives each pixel corresponding to the second area a predetermined gradation value between white and black By controlling the viewing angle of the liquid crystal display element 1 by applying a write signal to a plurality of pixels of the liquid crystal display element 1 and irradiating the right illumination light L2 from the surface light source 13 in synchronization therewith, The liquid crystal display element 1 of performing the narrow viewing angle display that was narrowing the viewing angle.

  In the case of this narrow viewing angle display, a plurality of pixels of the liquid crystal display element 1 are synchronized with the irradiation of the left direction illumination light L1 from the front direction (direction near the normal line of the liquid crystal display element 1). A display image corresponding to the first divided image data A1 when a write signal corresponding to one divided image data A1 is applied, and a plurality of liquid crystal display elements 1 in synchronization with the irradiation of the right illumination light L2. When a write signal corresponding to the second divided image data A2 is applied to the pixel, the display image corresponding to the second divided image data A2 appears to overlap with the left side of the front direction. From the direction inclined in the direction, only the display image corresponding to the first divided image data A1 displayed at the time of irradiation of the left direction illumination light L1 can be seen, and the direction inclined rightward with respect to the front direction From the right Display image corresponding to the divided image data A2 the second displayed upon irradiation of the illumination light L2 only visible.

  FIG. 4 shows an observation image from the front direction and the direction inclined to the left and right with respect to the front direction in the narrow viewing angle display, B is an observation image from the front direction, and B1 is An observation image from the left direction, B2 is an observation image from the right direction.

  As shown in FIG. 4, the observation image B1 from the left direction in the narrow viewing angle display is an image corresponding to the first divided image data A1, and the observation image B2 from the right direction is the second division. The observation images B1 and B2 are images corresponding to the image data A2, and the gradation white display f and the gray display g corresponding to the gradation values of the white data Va and the gray data Vc of the divided image data A1 and A2, respectively. Are arranged in a checkered pattern, in which a gray scale black display h corresponding to the gray scale value of the black data Vb of the divided image data A1 and A2 is partially visible, and the display content cannot be recognized. .

  On the other hand, the observation image B from the front direction is the observation image B1 from the left direction corresponding to the first divided image data A1 and the observation from the right direction corresponding to the second divided image data A2. The image appears to overlap the image B1, that is, the image corresponding to the image data A, and the background portion d has one white display f and the other gray of the observation images B1 and B2 from the left direction and the right direction. The light gray display that appears to overlap the display g, the display pattern portion e is a dark gray that appears to overlap one black display h and the other gray display g of the observation images B1 and B2 from the left and right directions. Display.

  As described above, the driving method is selected from among a plurality of regions obtained by dividing the screen region into a plurality of pieces of image data including a plurality of pixel data supplied to the plurality of pixels of the liquid crystal display element 1. Each pixel data corresponding to each pixel in the first area and a predetermined gradation between white and black are designated corresponding to each pixel in the second area other than the first area. First divided image data consisting of halftone data is applied to a plurality of pixels of the liquid crystal display element 1, and the left illumination light L1 from the surface light source 13 is irradiated in synchronization therewith, Among the image data, each pixel data corresponding to each pixel in the second area and a predetermined gradation between white and black corresponding to each pixel in the first area are designated. Second divided image data composed of halftone data is stored in the liquid crystal table. A direction inclined to the left with respect to the front direction (direction near the normal line of the liquid crystal display element 1) by applying to the plurality of pixels of the element and irradiating the right direction illumination light L2 in synchronization therewith, and The display image cannot be recognized from the direction tilted to the right, and according to this driving method, there is no risk of being peeped by others from the direction tilted with respect to the front direction. Narrow viewing angle display can be performed.

  Moreover, in this driving method, the left illumination light L1 and the right illumination light L2 from the surface light source 13 are selectively irradiated, and the first division into the plurality of pixels of the liquid crystal display element 1 synchronized therewith. Since the narrow viewing angle display is performed by the application of the write signal corresponding to the image data A1 and the second divided image data A2, the conventional viewing angle limiting method, that is, the region corresponding to the screen of the liquid crystal display element is formed. Compared with the method of limiting the viewing angle by a difficult-to-manufacture viewing angle limiting element in which liquid crystal molecules are aligned in different alignment states for each of the divided regions, the cost can be greatly reduced.

  Further, the driving method includes: out of a plurality of regions obtained by dividing the screen region of the liquid crystal display element 1 in a grid pattern among image data including a plurality of pixel data supplied to the plurality of pixels of the liquid crystal display element 1. Each pixel data corresponding to each pixel in the first area selected in a checkered pattern and each pixel in the second area other than the first area selected in the checkered pattern. First divided image data composed of halftone data in which a predetermined gradation between white and black is designated is applied to a plurality of pixels of the liquid crystal display element 1, and the first divided image data The left illumination light L1 is irradiated from the surface light source 13 in synchronization with the application to each pixel, and among the image data, each pixel data corresponding to each pixel in the second region, and a checkered pattern Corresponding to each pixel in the first region selected. Second divided image data composed of the halftone data in which a predetermined gradation between white and black is designated is applied to a plurality of pixels of the liquid crystal display element 1, and the second divided image data is applied. Since the illumination light L2 is emitted from the surface light source 13 in synchronism with the application to each pixel, the direction inclined to the left and the direction inclined to the right with respect to the front direction. The display image is hidden by the checkered pattern and cannot be recognized, so that it is possible to perform a narrower viewing angle display with higher security.

  The liquid crystal display device is disposed on the opposite side of the liquid crystal display element 1 from the observation side of the liquid crystal display element 1, and in the normal direction of the liquid crystal display element 1 toward the liquid crystal display element 1. On the other hand, the left direction illumination light L1 having directivity having a peak of emitted light intensity in a direction inclined to the left direction and the directivity having a peak of emitted light intensity in a direction inclined to the right direction with respect to the normal line. Among the plurality of areas obtained by dividing the screen area of the liquid crystal display element 1 among the surface light source 13 that emits the right-direction illumination light L2 having image data and the image data supplied to the plurality of pixels of the liquid crystal display element 1 A predetermined gradation value between white and black is given to each pixel in the selected first area, and the pixel data of each pixel corresponding to the second area other than the first area is passed. The first divided image processed by applying the first data processing filter to be processed A write signal corresponding to data is applied to a plurality of pixels of the liquid crystal display element 1, and the left illumination light L1 is emitted from the surface light source 13 in synchronization with the application of the write signal, whereby the second illumination light is emitted. The pixel data corresponding to each pixel in the first region is passed in synchronization with the irradiation of the first region, and a predetermined gradation value between white and black is given to each pixel corresponding to the second region. A write signal corresponding to the second divided image data processed by applying the data processing filter of 2 is applied to a plurality of pixels of the liquid crystal display element 1, and is synchronized with the application of the write signal from the surface light source to the right Since the liquid crystal display element 1 can be driven by the driving method because it is provided with the driving means 16 that irradiates the directional illumination light L2, there is no risk of being peeped by others. It can be performed with high narrow viewing angle display, moreover the cost can be reduced.

  In addition, the liquid crystal display device causes the driving unit 16 to simultaneously irradiate the left illumination light L1 and the right illumination light L2 from the surface light source 13, and the plurality of pixels of the liquid crystal display element 1 are subjected to the first illumination. Since there is provided a means for applying a write signal corresponding to unprocessed image data A without applying the first and second data processing filters F1 and F2, the narrow viewing angle display and the wide viewing angle display are selectively used. Can be done.

  That is, the liquid crystal display device simultaneously irradiates the left illumination light L1 and the right illumination light L2 from the surface light source 13, and applies the unprocessed image data A to a plurality of pixels of the liquid crystal display element 1. By applying a corresponding write signal, it is possible to perform a wide viewing angle display capable of recognizing display contents from the front direction and from the direction inclined to the left and right with respect to the front direction.

  The observation image from the front direction and the direction inclined to the left and right in the wide viewing angle display includes an image corresponding to the unprocessed image data A displayed when the left direction illumination light L1 is irradiated, The image corresponding to the non-processed image data A displayed at the time of irradiation of the right illumination light L2, that is, the image corresponding to the image data A, the gradation of the background portion is the image The gradation corresponding to the gradation value of the background data a of the data A and the gradation of the display pattern portion are gradations corresponding to the gradation value of the display data b of the image data A.

(Second Embodiment)
FIGS. 5 and 6 show a second embodiment of the driving method of the present invention. FIG. 5 shows image data, first and second data processing filters, and first and second divided image data. FIG. 6 is a conceptual diagram showing a pattern, and FIG. 6 is a diagram showing an observation image from a front direction in narrow viewing angle display and a direction inclined leftward and rightward with respect to the frontal direction. In this embodiment, parts corresponding to those of the first embodiment described above are given the same reference numerals in the drawings, and the description of the same parts is omitted.

  As shown in FIG. 5, in the driving method of this embodiment, image data supplied to a plurality of pixels of the liquid crystal display element 1 is converted into one of two directions intersecting the screen area of the liquid crystal display element 1, for example, A predetermined gradation value between white and black is assigned to each pixel in the first partial region selected every other one of the plurality of regions divided in a stripe shape along the horizontal direction (row direction) of the screen. A first partial filter (hereinafter referred to as a first row direction data processing filter) F11 that passes pixel data corresponding to each pixel in a second partial region that is formed of a region other than the first partial region; , White in each of the pixels in the third partial region selected every other one of the plurality of regions divided into stripes along the other of the two directions, for example, the vertical direction (column direction) of the screen. Give a predetermined tone value between black and A first partial filter including a second partial filter (hereinafter referred to as a first column direction data processing filter) F12 that passes pixel data corresponding to each pixel in a fourth partial region that is a region other than the partial region. One of the first divided image data processed by applying a data processing filter is applied to a plurality of pixels of the liquid crystal display element 1, and the surface is synchronized with the application of the first divided image data to the pixels. The left illumination light L1 is emitted from the light source 13, the pixel data corresponding to each pixel in the first partial area is passed through the image data, and each pixel in the second partial area is whitened. A third partial filter (hereinafter referred to as a second row direction data processing filter) F21 that gives a predetermined gradation value between black and pixel data corresponding to each pixel in the third partial region is passed. , The fourth A second data processing filter comprising a fourth partial filter (hereinafter referred to as a second column direction data processing filter) F22 which gives a predetermined gradation value between white and black to each pixel in the partial area is multiplied. The second divided image data processed in this way is applied to a plurality of pixels of the liquid crystal display element 1, and the right illumination from the surface light source 13 is synchronized with the application of the second divided image data to each pixel. The light L2 is irradiated.

  In other words, the driving method of this embodiment includes a first data processing filter including the first row direction data processing filter F11 and the first column direction data processing filter F12, and the second row direction data processing. A second data processing filter comprising a filter F21 and a second column direction data processing filter F22; and a first one obtained by processing the image data A by applying the first row direction data processing filter F11 Of the divided image data A11 and the first other processed image data A12 obtained by processing the image data A by applying the first column direction data processing filter F12, a write signal corresponding to the combined data A13 is displayed on the liquid crystal display. The image data A is applied to a plurality of pixels of the element 1 and is irradiated with the left illumination light L1 from the surface light source 13 in synchronization with the pixels. The second divided image data A21 processed by applying the row direction data processing filter F21 and the second other divided image processed by applying the second column direction data processing filter F22 to the image data A. A write signal corresponding to the combined data A23 with the data A22 is applied to a plurality of pixels of the liquid crystal display element 1, and the right illumination light L2 is irradiated from the surface light source 13 in synchronization therewith, whereby the liquid crystal display A narrow viewing angle display in which the viewing angle of the element 1 is narrowed is performed.

  In this embodiment, the first row direction data processing filter F11 and the column direction data processing filter F12, and the second row direction data processing filter F21 and the column direction data processing filter F22, respectively, A plurality of filter portions Fa for providing a predetermined gradation value between black and black, for example, a gray gradation value between white and black, and a data path portion Fb for passing the image data A as it is.

  Each filter unit Fa of the first row direction data processing filter F11 writes to each pixel in a plurality of striped regions along the row direction of the screen of the liquid crystal display element 1 in the image data A. The plurality of filter portions Fa of the second row direction data processing filter F21 correspond to the data to be written, and write in the pixels of the other areas along the row direction of the liquid crystal display element 1 in the image data A. It corresponds to data.

  In addition, each filter unit Fa of the first column direction data processing filter F12 writes to each pixel in a plurality of stripe-shaped regions along the column direction of the screen of the liquid crystal display element 1 in the image data A. The plurality of filter units Fa of the second column direction data processing filter F22 correspond to the data to be written, and write to the pixels in the other area along the column direction of the liquid crystal display element 1 in the image data A. It corresponds to data.

  Therefore, the first one of the divided image data A11 processed by applying the first row direction data processing filter F11 to the image data A has a plurality of stripe-like shapes along the row direction of the screen of the liquid crystal display element 1. The gradation value of the data written to each pixel in the region becomes the gray gradation of the predetermined value, and the gradation value of the data written to the other pixels is the gradation value of the background data a or the display data b of the image data A. The second one piece of divided image data A21 obtained by applying the second row direction data processing filter F21 to the image data A is inverted from the first one piece of divided image data A11. Data.

  Further, the first other divided image data A12 processed by applying the first column direction data processing filter F12 to the image data A is a plurality of stripe-shaped pieces along the column direction of the screen of the liquid crystal display element 1. The gradation value of data to be written in each pixel in the area becomes the gray gradation of the predetermined value, and the gradation of data to be written in other pixels is the gradation value of the background data a of the image data A or the display data b. The second divided image data A22 obtained by applying the second column direction data processing filter F22 to the image data A is inverted and the first other divided image data A1b is inverted. Data.

  That is, the first one of the divided image data A11 includes the white data Va portion of the gradation value of the background data a and the first row direction data processing in an area corresponding to the background data a of the image data A. The gray data Vc portions having a predetermined gradation value given by the filter F11 are arranged in stripes along the row direction, and the gradation value black of the display data b is displayed in an area corresponding to the display data b of the image data A. The data Vb portion and the gray data Vc portion are alternately arranged in stripes along the row direction, and the first other divided image data A12 corresponds to the background data a of the image data A. In a region, a gray value V data portion of the gradation value of the background data a and a gray data Vc portion of the predetermined gradation value given by the first column direction data processing filter F12 are arranged in a row. In the region corresponding to the display data b of the image data A, the gradation data black data Vb portion and the gray data Vc portion of the display data b are alternately arranged for each stripe shape along the column direction. It is data lined up.

  Accordingly, the first synthesized data A13 obtained by synthesizing the first one and the other two divided image data A11, A12 is a gradation value of the background data a in an area corresponding to the background data a of the image data A. White data Va part, gray data Vc part, and gray light gray data Vd part obtained by synthesizing one white data Va of the two divided image data A11 and A12 and the other gray data Vc. In the region corresponding to the display data b of the image data A, the black data Vb portion of the gradation value of the display data b, the gray data Vc portion, and one of the two divided image data A11 and A12 This is data in which dark gray data Ve portions of gray scale obtained by combining the black data Vb and the other gray data Vc are arranged in a checkered pattern.

  Further, the second one of the divided image data A21 includes the white data Va portion and the gray data Vc portion in the region corresponding to the background data a of the image data A. The black data Vb portion and the gray data Vc portion are arranged in a stripe pattern along the row direction in a pattern obtained by inverting A11, and the black data Vb portion and the gray data Vc portion are the first one of the divided images in the region corresponding to the display data b of the image data A. The data A11 is a pattern obtained by inverting the data A11 alternately in stripes along the row direction, and the second other divided image data A22 is placed in an area corresponding to the background data a of the image data A. The white data Va portion and the gray data Vc portion are arranged in stripes along the column direction in a pattern in which the first other divided image data A12 is inverted, and the image data A Data in which the black data Vb portion and the gray data Vc portion are alternately arranged in stripes along the column direction in a pattern obtained by inverting the first other divided image data A12 in an area corresponding to the display data b It is.

  Therefore, the second synthesized data A23 obtained by synthesizing the second one and the other two divided image data A21 and A22 is in a region corresponding to the background data a of the image data A, and the white data Va portion, The gray data Vc portion, and the gray light gray data Vd portion obtained by synthesizing one white data Va of the two divided image data A21 and A22 and the other gray data Vc, the white data Va portion being the first data 1 corresponding to the gray data Vc portion of the composite data A13, the gray data Vc portion corresponding to the white data Va portion of the first composite data A13, and the light gray data Vd portion corresponding to the light data V13 of the first composite data A13. A pattern corresponding to the gray data Vd portion is arranged in a checkered pattern, and the black data Vb portion, the gray data Vc portion, and the two are arranged in an area corresponding to the display data b of the image data A. A gray-scale dark gray data Ve portion obtained by synthesizing one black data Vb of the divided image data A21 and A22 and the other gray data Vc, and the black data Vb portion is a gray data Vc portion of the first synthesized data A13. The gray data Vc portion corresponds to the black data Vb portion of the first composite data A13, and the dark gray data Ve portion has a pattern corresponding to the dark gray data Ve portion of the first composite data A13. It is data arranged in a line.

  In the driving method of this embodiment, a write signal corresponding to the first composite data A13 is applied to a plurality of pixels of the liquid crystal display element 1 in synchronization with the irradiation of the left illumination light L1 from the surface light source 13. Then, in synchronization with the irradiation of the right direction illumination light L2 from the surface light source 13, by applying a write signal corresponding to the second composite data A23 to the plurality of pixels of the liquid crystal display element 1, the liquid crystal A narrow viewing angle display with a narrow viewing angle of the display element 1 is performed. An observation image B from the front direction in the narrow viewing angle display according to this embodiment, and a left direction and a right direction with respect to the front direction. Observation images B1 and B2 from the direction tilted toward are respectively images as shown in FIG.

  As shown in FIG. 6, the observation image B1 from the left direction in the narrow viewing angle display is an image corresponding to the first composite data A13, and the observation image B2 from the right direction is the second composite data. The observation images B1 and B2 are images corresponding to A23, and the grayscale white display k and gray corresponding to the grayscale values of the white data Va, the gray data Vc, and the light gray data Vd of the composite data A13 and A23, respectively. The display m, the light gray display n, and the dark gray display p are arranged in a checkered pattern, in which a gradation black display r corresponding to the gradation value of the black data Vb of the composite data A13, A23 is partially visible. This is an image whose display content cannot be recognized.

  On the other hand, the observation image B from the front direction is the observation image B1 from the left direction corresponding to the first composite data A13 and the observation image B1 from the right direction corresponding to the second composite data A23. Are images corresponding to the image data A, and the background portion i has one white display k and the other gray display m of the observation images B1 and B2 from the left direction and the right direction. A light gray display composed of a light gray portion that appears to overlap and a light gray portion that appears to overlap the light gray display p of both the observation images B1 and B2 from the left and right directions. The dark gray display part in which one black display r and the other gray display m of the observation images B1, B2 from the left direction and the right direction appear to overlap each other, and the observation images B1, B2 from the left direction and the right direction Both dark gray display p and A dark gray display is composed of a dark gray part look overlap.

  In addition, the light gray portion where one white display k and the other gray display m of the observation images B1 and B2 from the left direction and the right direction appear to overlap each other, and the observation images B1 and B2 from the left direction and the right direction Are substantially the same gradation as the light gray part that appears to overlap the light gray display p, and one black display r and the other gray display m of the observation images B1 and B2 from the left and right directions. And the dark gray part where the dark gray parts p of the observation images B1 and B2 from the left direction and the right direction appear to overlap each other have substantially the same tone. The background part i of the observation image B from the front direction is a light gray display without checkered gradation, and the display pattern part e is a dark gray display without checkered gradation.

  Therefore, according to the driving method of this embodiment, the display image differs in gradation from the direction inclined in one direction (left direction) and the direction inclined in the opposite direction (right direction) with respect to the front direction. It is possible to display a narrower viewing angle with higher security that is hidden by a checkered pattern composed of a plurality of patterns and cannot be recognized.

(Other embodiments)
Note that the first and second data processing filters F1 and F2 in the first embodiment described above use the filter unit Fa that gives a predetermined gradation value between white and black to the image data A in the row direction and the column direction. The filter part Fa may be a filter having a pattern reversed to each other and arranged in a checkered pattern in two directions inclined obliquely with respect to the row direction and the column direction. A filter having a pattern in which the filter portions Fa are arranged at random and in which the filter portions Fa are arranged at random may be used.

  Further, the first one data processing filter F11, the second one data processing filter F21, the first other data processing filter F12, and the second other data processing filter F22 in the second embodiment described above are: The filter portion Fa is not limited to a stripe shape along the row direction and a stripe shape along the column direction. For example, the first one data processing filter F11 and the second one data processing filter F21 are provided. The first and second data processing filters F12 and F2 have a filter pattern Fa having stripe-shaped filter portions Fa along one of two directions inclined obliquely with respect to the row direction and the column direction. The other data processing filter F22 is mutually inverted with a striped filter portion Fa along the other of the two directions. It may be used as the filter of the pattern.

1 is a plan view of a liquid crystal display device showing a first embodiment of the present invention; The expanded sectional view of a part of liquid crystal display element of the said liquid crystal display device. FIG. 5 is a conceptual diagram in which image data, first and second data processing filters, and first and second divided image data are patterned in the driving method of the first embodiment. The figure which shows the observation image from the direction inclined in the left direction and the right direction with respect to the front direction and the said front direction at the time of narrow viewing angle display in a 1st Example. The conceptual diagram which patterned the image data which shows the 2nd Example of the drive method of this invention, the 1st and 2nd data processing filter, and the 1st and 2nd division | segmentation image data. The figure which shows the observation image from the direction inclined in the left direction and the right direction with respect to the front direction and the said front direction at the time of narrow viewing angle display in 2nd Example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display element, 13 ... Surface light source, L1 ... 1st illumination light (left direction illumination light), L2 ... 2nd illumination light (right direction illumination light), 16 ... Drive means, A ... Image data, F1 , F2, F11, F12, F21, F22 ... data processing filter, A1, A2, A11, A12, A21, A22 ... divided image data, A13, A23 ... composite data, B ... observation image from the front direction, B1 ... left Observation image from the direction, B2... Observation image from the right direction.

Claims (5)

In a liquid crystal display element having a screen region in which a plurality of pixels for controlling light transmission are arranged in a matrix, the liquid crystal display element is tilted in one direction with respect to the normal direction of the liquid crystal display element from the side opposite to the observation side The first illumination light having the directivity having the peak of the emitted light intensity in the direction and the directivity having the peak of the emitted light intensity in the direction inclined in the direction opposite to the one direction with respect to the normal line. A light source for selectively irradiating the second illumination light having
Corresponding to each pixel in the selected first region of the plurality of regions obtained by dividing the screen region into a plurality of image data consisting of a plurality of pixel data supplied to the plurality of pixels of the liquid crystal display element And first halftone data in which a predetermined gradation between white and black is designated corresponding to each pixel in the second region other than the first region. The divided image data is applied to a plurality of pixels of the liquid crystal display element, and the first illumination light is irradiated from the light source in synchronization with the application of the first divided image data to the pixels, and the image data Among the pixel data corresponding to each pixel in the second area, and the halftone in which a predetermined gradation between white and black is designated corresponding to each pixel in the first area. Second divided image data comprising the data, the liquid crystal display element Is applied to the plurality of pixels, the driving method of a liquid crystal display element characterized thereby irradiate the second illumination light from the light source in synchronization with the application to the pixels of the second divided image data.   Of the image data composed of a plurality of pixel data supplied to a plurality of pixels of the liquid crystal display element, the first selected in a checkered pattern among a plurality of areas obtained by dividing the screen area of the liquid crystal display element in a grid pattern Predetermined between white and black corresponding to each pixel data corresponding to each pixel in the region and each pixel in the second region other than the first region selected in a checkered pattern First divided image data composed of halftone data in which gradation is specified is applied to a plurality of pixels of the liquid crystal display element, and a light source is synchronized with the application of the first divided image data to the pixels. Irradiating the first illumination light from the image data, corresponding to each pixel data corresponding to each pixel in the second area and each pixel in the first area selected in a checkered pattern among the image data. The halftone with a predetermined tone between white and black Is applied to a plurality of pixels of the liquid crystal display element, and the second illumination from the light source is synchronized with the application of the second divided image data to the pixels. The method for driving a liquid crystal display element according to claim 1, wherein light is irradiated.   The image data supplied to the plurality of pixels of the liquid crystal display element is selected every other one of the plurality of areas obtained by dividing the screen area of the liquid crystal display element into stripes along one of two directions intersecting each other. Pixel data corresponding to each pixel in the second partial area, which is a region other than the first partial area, is given a predetermined gradation value between white and black to each pixel in the first partial area And a third partial filter selected every other one of a plurality of regions obtained by dividing the screen region of the liquid crystal display element into stripes along the other of the two directions intersecting each other. A second gradation value that gives a predetermined gradation value between white and black to each pixel in the partial area and passes pixel data corresponding to each pixel in the fourth partial area that is formed of an area other than the third partial area. First data consisting of a partial filter of One of the first divided image data processed by applying the processing filter is applied to a plurality of pixels of the liquid crystal display element, and the first divided image data is applied from the light source to the first in synchronization with the application of the first divided image data to the pixels. The image data is passed through pixel data corresponding to each pixel in the first partial area, and each pixel in the second partial area is predetermined between white and black. A third partial filter that gives a gradation value and pixel data corresponding to each pixel in the third partial region are passed, and each pixel in the fourth partial region is predetermined between white and black. The second divided image data processed by applying a second data processing filter comprising a fourth partial filter that gives a gradation value is applied to a plurality of pixels of the liquid crystal display element, and the second processed image data In synchronization with the application of the light to each pixel Method of driving a liquid crystal display device according to claim 1, characterized in that to irradiate the second illumination light from. A liquid crystal display element having a screen region in which a plurality of pixels for controlling light transmission are arranged in a matrix, and
The liquid crystal display element is disposed on the side opposite to the observation side, and has a peak of emitted light intensity in a direction inclined in one direction with respect to the normal direction of the liquid crystal display element toward the liquid crystal display element. The first illuminating light having directivity and the second illuminating light having directivity having a peak of emitted light intensity in a direction inclined in a direction opposite to the one direction with respect to the normal line are selectively used. A surface light source that illuminates
Among the image data supplied to the plurality of pixels of the liquid crystal display element, each pixel in the selected first area among the plurality of areas obtained by dividing the screen area of the liquid crystal display element is between white and black. The first divided image data processed by applying a first data processing filter that gives a predetermined gradation value and passes pixel data of each pixel corresponding to the second region other than the first region. Is applied to a plurality of pixels of the liquid crystal display element, and the first illumination light is irradiated from the light source in synchronization with the application of the write signal, and is synchronized with the irradiation of the second illumination light. Second data processing for passing each pixel data corresponding to each pixel in the first area and giving each pixel corresponding to the second area a predetermined gradation value between white and black To the second divided image data processed by filtering And a driving unit that applies the second write light to the plurality of pixels of the liquid crystal display element and irradiates the second illumination light from the light source in synchronization with the application of the write signal. Display device.   The driving means irradiates the first illumination light and the second illumination light from the surface light source at the same time, and does not apply the first and second data processing filters to the plurality of pixels of the liquid crystal display element. 5. The liquid crystal display device according to claim 4, further comprising means for applying a write signal according to the above.

Images