JP2015118301A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain substantially the same display appearances in display regions driven by static and duty drive systems while using a general-purpose drive unit.SOLUTION: A liquid crystal display device displays a first display element by a static drive system in a predetermined region S, while the device displays a second display element by a duty drive system in a region D different from the predetermined region S. The liquid crystal display device includes a transmittance adjusting part 5 for adjusting the transmittance of the first display element, which comprises openings 21a, 22a formed in a first electrode part 20 corresponding to the predetermined region S. The transmittance adjusting part 5 controls an opening ratio of the first display element while an on-voltage is applied so as to match a ratio of the transmittance of the first display element while the on-voltage is applied without the transmittance adjusting part 5 to the transmittance of the second display element while the on-voltage is applied.

Description

  The present invention relates to a liquid crystal display device.

  As a conventional liquid crystal display device, in Patent Document 1, a display element is displayed in a predetermined area (a picture area in the same document) of the display area by a static drive method, and an area different from the predetermined area (the same document). In the main display area, a liquid crystal display device that displays display elements by a duty driving method is disclosed (see FIG. 14 of the same reference).

JP-A-8-234704

In a liquid crystal display device in which static and duty drive systems coexist, if no measures are taken, a display brightness difference will occur between the static drive display area and the duty drive display area, resulting in poor display appearance. Resulting in.
Specifically, a negative display type liquid crystal display device will be described as an example. As shown in FIG. 7, the on-voltage V _D in the duty drive is lower than the on-voltage V _S in the static drive. from becoming lower than the transmittance T _S during transmission T _D during transmittance duty driving static driving time, the display area by static drive becomes brighter than the display area by the duty driving.

  In the liquid crystal display device according to Patent Document 1, an attempt is made to solve the above problem by adjusting a driving side condition using a driving unit including only one set of driving ICs for a segment and a common. If the adjustment is performed on the drive side, the drive unit needs to be customized, which is difficult to realize with a general-purpose drive unit.

  The present invention has been made in view of the above circumstances, and is a liquid crystal display device in which both static and duty drive systems are mixed, and displays between display areas by using both drive systems while using a general-purpose drive unit. An object of the present invention is to provide a liquid crystal display device that can have the same appearance.

In order to achieve the above object, a liquid crystal display device according to the present invention comprises:
A liquid crystal display device that displays a first display element by a static drive method in a predetermined area of the display area and displays a second display element by a duty drive system in an area different from the predetermined area,
A pair of substrates facing each other across the liquid crystal layer;
A first electrode portion provided on the liquid crystal layer side of each of the pair of substrates;
A second electrode portion provided on the liquid crystal layer side of each of the pair of substrates,
The first display element is displayed corresponding to a region of the liquid crystal layer sandwiched between the first electrode portions to which an on-voltage is applied by a static drive method,
The second display element is displayed corresponding to a region of the liquid crystal layer sandwiched between the second electrode portions to which an on-voltage is applied by a duty driving method,
Transmission comprising an opening formed in the first electrode part or a light shielding part overlapping with the first electrode part in a normal direction of the pair of substrates, and adjusting the transmittance of the first display element With a rate adjuster,
The on-voltage when the aperture ratio of the first display element when the on-voltage is applied by the transmittance adjusting unit is not the transmittance adjusting unit with respect to the transmittance of the second display element when the on-voltage is applied. Matched to the transmittance ratio of the first display element at the time of application,
It is characterized by that.

  According to the present invention, it is possible to equalize the display appearance between display areas by both the static and duty drive methods while using a general-purpose drive unit.

It is a top view of the liquid crystal display device concerning one embodiment of the present invention. It is an AA line schematic sectional drawing of the liquid crystal panel shown in FIG. It is a figure corresponding to B section shown in Drawing 1, (a) is a schematic plan view of the front side electrode which constitutes the 1st electrode part, and (b) is the back side electrode which constitutes the 1st electrode part. FIG. (A) And (b) is a figure for demonstrating the opening diameter of the opening part provided in a 1st electrode part. It is a table | surface figure for demonstrating the relationship between the ON transmittance | permeability by a duty drive, the ON transmittance | permeability by a static drive, an aperture ratio, and the ratio of the opening part in a display element. It is a schematic sectional drawing of the liquid crystal panel which concerns on a modification. It is the figure which showed the VT (voltage-transmittance) curve in a negative display type liquid crystal display device.

  An embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, a liquid crystal display device 100 according to an embodiment of the present invention includes a liquid crystal panel 1, a static drive unit 2, and a duty drive unit 3 (in the figure, these external shapes are indicated by dotted lines). ). These are housed in a housing 4 where the display area of the liquid crystal panel 1 can be viewed.

  The liquid crystal display device 100 performs a display operation by the static drive unit 2 in a predetermined area (hereinafter, static display area S) among the display areas, and in an area different from the static display area S (hereinafter, duty display area D). A display operation is performed by the duty drive unit 3.

  The liquid crystal panel 1 is a vertical alignment type (VA (Virtical Alignment) type) liquid crystal panel, and is configured as a negative display type. As shown in FIG. 2, the liquid crystal panel 1 includes a pair of substrates 11 and 12, a first electrode unit 20, a second electrode unit 30, alignment films 41 and 42, a liquid crystal layer 50, and a polarizing plate. 61, 62.

  FIG. 2 is a schematic cross-sectional view taken along line AA of the liquid crystal panel 1 shown in FIG. 1, and is a diagram schematically showing the static drive unit 2 and the duty drive unit 3 together. In addition, hereinafter, in order to facilitate understanding of the configuration of the liquid crystal panel 1, each part will be described as appropriate with the user side (display side) of the liquid crystal display device 100 as the front side of the predetermined member and the opposite side as the back side.

  The substrates 11 and 12 are each formed of, for example, glass, plastic or the like transparently. The pair of substrates 11 and 12 are disposed to face each other with the liquid crystal layer 50 interposed therebetween. The substrate 11 is located on the front side of the liquid crystal layer 50, and the substrate 12 is located on the back side of the liquid crystal layer 50.

  The first electrode unit 20 and the second electrode unit 30 are each composed of an ITO (Indium Tin Oxide) film containing indium oxide as a main component, and are transparent electrodes that transmit light.

The first electrode unit 20 corresponds to the static display region S, and includes a front side electrode 21 located on the front side of the liquid crystal layer 50 and a back side electrode 22 located on the back side of the liquid crystal layer 50.
The front side electrode 21 is formed on the surface of the substrate 11 on the liquid crystal layer 50 side, and the back side electrode 22 is formed on the surface of the substrate 12 on the liquid crystal layer 50 side by a known method (sputtering, vapor deposition, etching, etc.). The front side electrode 21 is configured as a common electrode, and the back side electrode 22 is configured as a segment electrode. Both electrodes (that is, the first electrode unit 20) are electrically connected to the static drive unit 2 by a known method.
The static drive unit 2 includes, for example, a static drive IC (Integrated Circuit) mounted on a circuit board (not shown) located on the back side of the liquid crystal display panel 1, and the first electrode unit 20 is formed by a static drive method. Apply drive voltage.

The second electrode unit 30 corresponds to the duty display area D and includes a front side electrode 31 located on the front side of the liquid crystal layer 50 and a back side electrode 32 located on the back side of the liquid crystal layer 50.
The front side electrode 31 is formed on the surface of the substrate 11 on the liquid crystal layer 50 side, and the back side electrode 32 is formed on the surface of the substrate 12 on the liquid crystal layer 50 side by a known method (sputtering, vapor deposition, etching, etc.). The front side electrode 31 is configured as a common electrode, and the back side electrode 32 is configured as a segment electrode. Both electrodes (that is, the second electrode unit 30) are electrically connected to the duty driving unit 3 by a known method.
The duty drive unit 3 is composed of, for example, a duty drive IC mounted on the circuit board (not shown) described above, and applies a drive voltage to the second electrode unit 30 by a duty drive (dynamic drive) method.

In the first electrode unit 20, the front electrode 21 may be configured as a segment electrode, and the back electrode 22 may be configured as a common electrode. Similarly, in the second electrode unit 30, the front electrode 31 may be configured as a segment electrode, and the back electrode 32 may be configured as a common electrode.
The first electrode unit 20 includes a transmittance adjusting unit 5 including a plurality of openings 21 a formed in the front side electrode 21 and a plurality of openings 22 a formed in the back side electrode 22. The transmittance adjusting unit 5 will be described in detail later.

The front side electrode 21 and the back side electrode 22 constituting the first electrode unit 20 are each patterned in a predetermined shape. The liquid crystal display device 100 has the predetermined shape in a region where the front electrode 21 and the back electrode 22 overlap each other when viewed from the normal direction of the opposing surfaces of the substrate 11 and the substrate 12 (hereinafter simply referred to as the substrate normal direction). The display element corresponding to is displayed. Here, the display element is an element of an image displayed by the liquid crystal display device 100, and includes not only a figure but also a single element representing a symbol such as a character, a number, or an icon. The liquid crystal display device 100 corresponds to the region by transmitting light in the region of the liquid crystal layer 50 sandwiched between the first electrode portions 20 to which the ON voltage is applied from the static drive unit 2 by the static drive method. The display element is set to the display state (displayed substantially white).
The configuration of the second electrode unit 30 is the same, and the liquid crystal display device 100 displays a display corresponding to the shape of the patterned electrode in a region where the front side electrode 31 and the back side electrode 32 overlap when viewed from the substrate normal direction. Display elements. The liquid crystal display device 100 corresponds to the region by transmitting light in the region of the liquid crystal layer 50 sandwiched between the second electrode portions 30 to which the on-voltage is applied from the duty driving unit 3 by the duty driving method. The display element is set to the display state (displayed substantially white).
In the liquid crystal display device 100, when viewed from the substrate normal direction, a region where the front electrode 21 and the back electrode 22 do not overlap, a region where the front electrode 31 and the back electrode 32 do not overlap, and a region where no on-voltage is applied. Becomes a substantially black background region 6. As described above, the liquid crystal display device 100 is configured as a so-called negative display type (normally black mode) in which display elements are displayed in a substantially black background region 6 in a substantially white color.

  Hereinafter, a display element displayed in the static display area S corresponding to the first electrode unit 20 is a first display element, and a display element displayed in the duty display area D is corresponding to the second electrode unit 30. This will be described as the second display element.

In the static display area S, as shown in FIG. 1, the liquid crystal display device 100 can display a three-digit numerical value in a so-called 7-segment format and a unit of “km / h”. In this example, the first display element 7 is a hexagonal segment, a character “k”, a symbol “/”, or the like.
In the duty display area D, as shown in FIG. 1, the liquid crystal display device 100 can display a 6-digit numerical value in 7-segment format, a unit of “km”, and a bar graph. In this example, the second display element 8 is a hexagonal segment, a character “k”, a rectangular figure constituting a bar graph, or the like.

  The alignment films 41 and 42 are vertical alignment films in contact with the liquid crystal layer 50, respectively, and are formed from, for example, polyimide by a known method (for example, flexographic printing). The alignment film 41 covers the front side electrodes 21 and 31 from the liquid crystal layer 50 side, and the alignment film 42 covers the back side electrodes 22 and 32 from the liquid crystal layer 50 side. The alignment films 41 and 42 align liquid crystal molecules when a voltage is not applied to the liquid crystal layer 50 (when no voltage is applied) substantially perpendicularly to the main surfaces (surfaces facing the liquid crystal layer 50 side) of the substrates 11 and 12. Let

  The liquid crystal layer 50 is sealed in a space formed by the substrate 11, the substrate 12, and a sealing material (not shown) that joins both substrates. The liquid crystal layer 50 is made of a liquid crystal material having a negative dielectric anisotropy Δε (Δε <0). Further, the layer thickness (cell gap) of the liquid crystal layer 50 is kept constant by a spacer (not shown). When a voltage equal to or higher than the threshold voltage is applied to the liquid crystal layer 50, the liquid crystal molecules that are aligned substantially vertically behave like falling down. When the ON voltage is applied, the liquid crystal molecules are substantially parallel to the main surfaces of the substrates 11 and 12.

  The polarizing plates 61 and 62 emit light incident from one surface side from the other surface side as linearly polarized light along a transmission axis perpendicular to the absorption axis. As shown in FIG. 2, the polarizing plate 61 is located on the front side of the substrate 11, and the polarizing plate 62 is located on the back side of the substrate 12. The polarizing plate 61 and the polarizing plate 62 are arranged so that their absorption axes are orthogonal to each other when viewed from the normal direction of the substrate (orthogonal Nicol arrangement). Note that a backlight (not shown) is provided on the back side of the polarizing plate 62. The liquid crystal display device 100 performs transmissive display using light from a backlight.

  In the liquid crystal display device 100, the off voltage is set to a value lower than the threshold voltage at which the liquid crystal molecules start to fall. Therefore, even when an off voltage is applied to the liquid crystal layer 50, the liquid crystal molecules remain substantially vertically aligned. In this case, the polarization direction of the light emitted from the backlight and passing through the polarizing plate 62 is hardly changed by the liquid crystal layer 50. Therefore, most of the light transmitted through the liquid crystal layer 50 from the back side cannot pass through the polarizing plate 61 arranged in a relationship of crossed Nicols with the polarizing plate 62. Therefore, the display of the region to which the off voltage is applied is visually recognized as black (normally black mode). On the other hand, when an ON voltage is applied to the liquid crystal layer 50, the liquid crystal molecules in the region to which the ON voltage is applied behaves so as to be substantially parallel to the main surfaces of the substrates 11 and 12. Thereby, birefringence occurs in the light transmitted through the liquid crystal layer 50, the polarization direction of the light changes, and the light transmitted through the liquid crystal layer 50 from the back side is transmitted through the polarizing plate 61. Therefore, the region where the on-voltage is applied is in the transmissive display state.

(About the transmittance adjustment unit)
From here, the transmittance | permeability adjustment part 5 which the 1st electrode part 20 has is demonstrated in detail.
As described above, the on-voltage V _D in the duty drive is set lower than the on-voltage V _S in the static drive (FIG. 7). transmittance T _D at the time of driving is lower than the transmittance T _S during static driving. In this case, since the display area by static drive becomes brighter than the display area by duty drive, the display appearance deteriorates. The difference in appearance between the display areas in both drive systems becomes more prominent as the duty drive unit 3 is driven at a higher duty (the higher the 1 / n, the higher the duty).
As far as the time of the ON voltage application, by raising the on voltage V _D of the duty drive, but this problem can be resolved, at a duty drive, due to a limitation in the width of the ON voltage and the OFF voltage, the ON voltage off voltage will be increased by raising the V _D, in turn, will be increased as much as possible in black you want to view off voltage upon application of the transmittance, impaired display quality (so-called background loss becomes noticeable).
Therefore, the inventor of the present application uses the transmittance adjusting unit 5 including a plurality of openings 21 a formed in the front side electrode 21 and a plurality of openings 22 a formed in the back side electrode 22 to display the display area in both driving methods. I thought about eliminating the difference in appearance between the two.

  FIGS. 3A and 3B are plan views of electrodes corresponding to the display elements (one figure constituting 7 segments) located in the portion B shown in FIG. 1 among the first display elements 7. FIG. 3A is a schematic plan view of the front side electrode 21, and FIG. 3B is a schematic plan view of the back side electrode 22. For ease of viewing, FIGS. 3A and 3B omit the routing electrodes formed in the background region 6 (FIG. 1).

  As shown in FIG. 3A, the front electrode 21 is formed with a plurality of openings 21a penetrating the front electrode 21 in the normal direction of the substrate. The opening 21a has a rectangular shape as an example. Similarly, as shown in FIG. 3B, the back-side electrode 22 has a plurality of openings 22a penetrating the back-side electrode 22 in the substrate normal direction. The openings 22a have a rectangular shape like the openings 21a, and the plurality of openings 22a are arranged in the same pattern as the openings 21a formed in the front electrode 21. That is, each of the plurality of openings 21a and each of the plurality of openings 22a are arranged so as to overlap each other when viewed from the substrate normal direction.

As described above, the transmittance adjusting unit 5 including the plurality of openings 21a and the plurality of openings 22b is configured to transmit the transmittance of the first display element 7 (in the region where the first display element 7 is displayed). (Transmittance) is decreased by a predetermined ratio. In the region where the opening 21a and the opening 22b overlap in the normal direction of the substrate, no on-voltage is applied to the liquid crystal layer 50 sandwiched between them (no electric field is generated in the normal direction of the substrate), and the liquid crystal molecules are substantially This is because it remains vertically oriented and does not transmit light.
That is, the transmittance adjusting unit 5 reduces the aperture ratio of the first display element 7.

  Here, the term “aperture ratio” is used in various meanings depending on the technical field. In this text, “aperture ratio” refers to a portion that transmits light in a display area of a predetermined display element when an ON voltage is applied. Let's say the ratio to the part. Further, the ratio of the total area of the actually formed openings in the electrode area corresponding to the predetermined display element is distinguished from the term “aperture ratio” by calling the “opening ratio”.

Further, in the static display region S, when the transmittance adjusting unit 5 is not provided, the transmittance (on transmittance) of the first display element 7 when the on-voltage V _{S is} applied is T _S , and the duty display region In D, the transmittance (on transmittance) of the second display element 8 when the on voltage V _{D is} applied is denoted by T _D.
If no measures are taken, the first display element 7 displayed by static drive becomes brighter than the second display element 8 displayed by duty drive. Therefore, in the present embodiment, the transmittance R of the first display element 7 is set by the transmittance adjusting unit 5 so as to satisfy the following expression (Equation 1). The first display element 7 and the second display element 8 have the same brightness.

Further, the ratio of the total area of the actually formed openings in the electrode area corresponding to the first display element 7, that is, the ratio A of the openings is expressed by the following formula (Equation 2).
In the present embodiment, each of the plurality of openings 21 a formed in the front-side electrode 21 and each of the plurality of openings 22 a formed in the back-side electrode 22 overlap in the substrate normal direction. Therefore, the ratio A of the opening here is equal to the ratio of the total area of the plurality of openings 21 a in the area of the front electrode 21 corresponding to the first display element 7. It is also equal to the ratio of the total area of the plurality of openings 22a in the area of the corresponding back electrode 22.

An example of setting the aperture ratio R of the first display element 7 by the transmittance adjusting unit 5 will be described with reference to FIG. In the table shown in FIG. 5, when the duty is 1/1, it is described as a reference. In this case, since T _D and T _S is equal, the difference in display appearance by the drive system does not occur.
When 1 / 2Duty as shown in FIG. 5, on the transmittance T _D of the second display element 8, "22", and on transmission of the first display element 7 in the case without the transmittance adjusting unit 5 it can be seen that is smaller than "24" of rate T _S. At this time, the aperture ratio R of the first display element 7 in the static display region S may be set to R = 22 / 24≈0.91 (91%) according to the above equation (1). Specifically, in the electrode region corresponding to the first display element 7, openings are formed at a ratio of A = 1−0.91≈0.09 (9%) by the above equation (2). That's fine. Taking FIG. 3 as an example, the opening 21a is such that the total area of the plurality of openings 21a occupies 9% in the area of the outer shape of the front electrode 21 corresponding to the first display element 7 of the hexagonal segment. May be formed. Similarly, the opening 22a may be formed so that the total area of the plurality of openings 22a occupies 9% in the outer area of the back electrode 22 corresponding to the first display element 7 of the hexagonal segment. .
1 / When the 4Duty, for on-transmittance T _D of the second display element 8 is "19", the opening ratio of the first display elements 7 R in the static display area S, the (number 1) Thus, R = 19 / 24≈0.78 (78%). Specifically, openings are formed in the electrode region corresponding to the first display element 7 at a ratio of A = 1−0.78≈0.22 (22%) according to the above equation (2). That's fine.

  As shown in FIG. 3A, the plurality of openings 21a formed in the front electrode 21 are preferably arranged at random without having regularity as much as possible. This is because random display as much as possible can effectively reduce display disturbance of the first display element 7 that may be caused by forming the opening 21a. The same applies to the plurality of openings 22a formed in the back electrode 22 corresponding to the openings 21a (see FIG. 3B).

The opening diameter of each of the plurality of openings 21a is preferably 100 μm or less. This is because if the opening diameter is larger than 100 μm, the display disorder of the first display element 7 due to the formation of the opening 21a occurs.
In the above, an example in which the opening 21a is formed in a rectangular shape has been shown. However, in the case of a rectangular shape, the opening diameter is 100 μm or less, as shown in FIG. 4A, the short side L1 and the long side L2 are Both indicate the case of 100 μm or less. In addition, there is no limitation in the shape of the opening part 21a, For example, circular shape as shown in FIG.4 (b) may be sufficient. In this case, the opening 21a may be formed so that the diameter L is 100 μm or less.

  In addition, as described above, the transmittance of the first display element 7 is reduced by providing the opening 21a and the opening 22a so as to overlap in the normal direction of the substrate based on the ratio A of the opening. However, the transmittance of the first display element 7 may be adjusted by providing a plurality of openings on only one of the front-side electrode 21 and the back-side electrode 22. In this case, an opening may be provided in one of the electrodes so that the aperture ratio R satisfies the above (Equation 1).

Further, the second display element 8 to be compared with the first display element 7 in order to adjust the on-transmittance is optimal for equalizing the appearance of the static display area S and the duty display area D. Can be chosen arbitrarily.
Furthermore, the first display element 7 and the second display element 8 that serve as a reference for adjusting the on-transmittance may not be a single figure or symbol, but may be a set of a plurality of figures and symbols. It may be a display element displayed in the entire static display area S or a display element displayed in the entire duty display area D. Even in this case, an optimal one for making the appearance of the static display area S and the duty display area D equal may be arbitrarily selected.

Moreover, in the above example, although the transmittance | permeability adjustment part 5 showed the example comprised from opening part 21a, 22a, it may be comprised from a light-shielding part. Here, a liquid crystal display device according to a modification having a light shielding portion will be described with reference to FIG. The liquid crystal panel 1a of the liquid crystal display device according to the modified example includes a plurality of light shielding portions 5a as a transmittance adjusting unit. The liquid crystal panel 1a has substantially the same configuration as the liquid crystal panel 1 described above except that the first electrode portion 20 is not provided with openings 21a and 22a. Therefore, in FIG. 6, each part having the same function is denoted by the same reference numeral as that of the liquid crystal panel 1.
As shown in FIG. 6, the liquid crystal panel 1 a includes a light shielding part 5 a made of a black mask (light shielding film) and a light shielding part 5 a between the substrate 11 and the front side electrode 21 constituting the first electrode part 20. And a flattening layer 70 (for example, made of an overcoat layer made of a predetermined resin such as acrylic) for flattening a step due to being formed. There are a plurality of light shielding portions 5a, each of which is formed in a fine granular shape. Similarly to the opening, the light shielding part 5a may have a rectangular shape or a circular shape when viewed from the substrate normal direction. Further, in order to prevent display disturbance in the first display element 7 due to the formation of the light shielding portion 5a, the first display element 7 is arranged as small as possible and preferably at random like the opening. In this way, in the substrate normal direction, the light shielding portion 5a that overlaps with the front electrode 21 is provided so that the aperture ratio of the first display element 7 satisfies the above formula (1). Even if it does in this way, since the transmittance | permeability of the 1st display element 7 can be reduced and it can match with the transmittance | permeability of the 2nd display element 8, the display appearance of the static display area S and the duty display area D is improved. Can be equivalent. In addition, since the light-shielding part 5a should just be provided in the part which overlaps with the 1st display element 7 in a board | substrate normal line direction, it is provided in the front side of the polarizing plate 61, between the back side electrode 22 and the board | substrate 12, etc. It is also possible.

  In addition, this invention is not limited by said embodiment, its modification, and drawing. Of course, changes (including deletion of components) can be added to these.

The example in which the liquid crystal display device 100 is the VA type and the negative display type (normally black mode) has been described above, but is not limited thereto.
The liquid crystal display device may be a TN (Twisted Nematic) type or the like, or may be a positive display type (normally white mode) in which display elements are displayed in a substantially black background area. When the liquid crystal display device is a positive display type, the static display area S becomes darker than the duty display area D unless any countermeasure is taken. In this case, similarly to the liquid crystal display device 100, the on-transmittance of the first display element 7 may be adjusted by the transmittance adjusting unit 5 including the openings 21a and 22a. However, when the liquid crystal display device is a positive display type, the transmittance adjusting unit 5 increases the on-transmittance of the first display element 7. In any case, if the aperture ratio R of the first display element 7 satisfies the above (Equation 1) by the transmittance adjusting unit 5, the appearance of the static display area S and the duty display area D are equalized. It is possible.

  In the above, an example in which the liquid crystal display device 100 displays the display elements in the segment format in the duty display area D has been shown, but the display elements may be displayed in the passive matrix format. In this case, one pixel (dot) or a set of a plurality of pixels corresponds to the second display element 8.

The liquid crystal display device 100 described above displays the first display element 7 by a static drive method in a predetermined area (static display area S) among the display areas, and an area (duty display) different from the predetermined area. In the region D), the liquid crystal display device displays the second display element 8 by the duty drive method, and each of the pair of substrates 11 and 12 facing each other with the liquid crystal layer 50 interposed therebetween, and each of the pair of substrates 11 and 12 The first display element 7 includes a first electrode portion 20 provided on the liquid crystal layer 50 side and a second electrode portion 30 provided on the liquid crystal layer 50 side of each of the pair of substrates 11 and 12. Is displayed in correspondence with the region of the liquid crystal layer 50 sandwiched between the first electrode portions 20 to which the on-voltage is applied by the static drive method, and the on-voltage is applied to the second display element 8 by the duty drive method. The openings 21a and 22a formed in the first electrode unit 20 or the pair of substrates 11 and 12 are displayed corresponding to the region of the liquid crystal layer 50 sandwiched between the second electrode units 30 formed. The light-shielding portion 5a overlaps the first electrode portion 20 in the line direction, and includes a transmittance adjusting portion that adjusts the transmittance of the first display element 7. The transmittance adjusting portion allows the first voltage when the on-voltage is applied. The aperture ratio of the display element 7 is matched to the ratio of the transmittance of the first display element 7 when the on-voltage is applied to the transmittance of the second display element 8 when the on-voltage is applied without the transmittance adjusting unit. It has been.
As described above, in the liquid crystal display device in which both the static and duty drive systems are mixed, as described above, the display appearance between the display areas by the both drive systems can be made equal. Further, since there is no need to rely on adjustment on the drive side, a general-purpose drive unit can be used, and an increase in cost due to customization of the drive unit can be suppressed.

  In the above description, in order to facilitate the understanding of the present invention, the description of known unimportant technical matters is appropriately omitted.

DESCRIPTION OF SYMBOLS 100 ... Liquid crystal display device 1, 1a ... Liquid crystal panel 2 ... Static drive part 3 ... Duty drive part S ... Static display area D ... Duty display area 5 ... Transmittance adjustment part 5a ... Light-shielding part 11, 12 ... Substrate 20 ... 1st Electrode portion 21 ... Front side electrode 21a ... Opening portion 22 ... Back side electrode 22a ... Opening portion 30 ... Second electrode portion 31 ... Front side electrode 32 ... Back side electrodes 41 and 42 ... Orientation film 50 ... Liquid crystal layers 61 and 62 ... Polarizing plate 70 ... planarization layer

Claims (3)

A liquid crystal display device that displays a first display element by a static drive method in a predetermined area of the display area and displays a second display element by a duty drive system in an area different from the predetermined area,
A pair of substrates facing each other across the liquid crystal layer;
A first electrode portion provided on the liquid crystal layer side of each of the pair of substrates;
A second electrode portion provided on the liquid crystal layer side of each of the pair of substrates,
The first display element is displayed corresponding to a region of the liquid crystal layer sandwiched between the first electrode portions to which an on-voltage is applied by a static drive method,
The second display element is displayed corresponding to a region of the liquid crystal layer sandwiched between the second electrode portions to which an on-voltage is applied by a duty driving method,
Transmission comprising an opening formed in the first electrode part or a light shielding part overlapping with the first electrode part in a normal direction of the pair of substrates, and adjusting the transmittance of the first display element With a rate adjuster,
The on-voltage when the aperture ratio of the first display element when the on-voltage is applied by the transmittance adjusting unit is not the transmittance adjusting unit with respect to the transmittance of the second display element when the on-voltage is applied. Matched to the transmittance ratio of the first display element at the time of application,
A liquid crystal display device characterized by the above. The liquid crystal display device is a negative display type for transmissively displaying the first display element and the second display element,
The transmittance adjusting unit reduces the transmittance of the first display element when an on-voltage is applied;
The liquid crystal display device according to claim 1. The transmittance adjusting unit includes a plurality of openings formed in the first electrode unit, and each of the plurality of openings has an opening diameter of 100 μm or less.
The liquid crystal display device according to claim 1 or 2.

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