JP2010072391A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transmission type liquid crystal display device of normally white mode enabled to display an arbitrary character or pattern when liquid crystal display device is not driven. <P>SOLUTION: In the transmission type liquid crystal display device 10 of a normally white type having liquid crystal 15 sandwiched between a pair of substrates 13 and 14, a reflector 32 is formed on one 13 of the pair of substrates partially for each sub-pixel, and while a color filter 40 is formed on the other 14 of the pair of substrates, a light shield layer 37 is formed at a position corresponding to the reflector 32. Sub-pixels in an area corresponding to the pattern to be displayed when the transmission type liquid crystal display device 10 is not driven has a cut part 37a formed by partially cutting the light shield layer 37, and a color filter layer 40 is extended to the cut part 37a of the light shield layer 37. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a liquid crystal display device, and more particularly to a normally white mode transmissive liquid crystal display device which can display an arbitrary character or pattern when the liquid crystal display device is not driven.

Most liquid crystal display devices use a transmissive type that displays a predetermined image by light transmitted through the liquid crystal using a backlight, but a reflective type that uses external light for image display and A transflective type having both transmissive and reflective properties (see Patent Documents 1 to 3 below) is also known. Among these, the transflective liquid crystal display device has a light transmission region including a pixel electrode and a light reflection region including both the pixel electrode and the reflection plate in one pixel region. In a dark place, the backlight is turned on and an image is displayed using the light transmission area, and in a bright place, the image is displayed using outside light in the light reflection area without turning on the backlight. It is. Therefore, the transflective liquid crystal display device has an advantage that power consumption can be significantly reduced because it is not necessary to always turn on the backlight. This transflective liquid crystal display device is widely used as a display unit of a small-sized electronic device such as a mobile phone.

In addition, there are normally black mode and normally white mode liquid crystal display devices. However, in the normally white mode transmission type liquid crystal display devices, conventionally, light reflection or backlighting between adjacent pixels is required. In order to prevent light leakage from the light, the adjacent pixels are shielded by a light shielding layer made of metal or resin.

For this reason, the portion of the light shielding layer cannot transmit or reflect light, and thus cannot display anything. Furthermore, since the presence of the light shielding layer lowers the aperture ratio, it is preferable to make the width of the light shielding layer as narrow as possible. In order to solve this problem, an invention of a liquid crystal display device in which the width of the light shielding film is reduced is disclosed in Patent Document 4 below. The liquid crystal display device disclosed in the following Patent Document 4 will be described with reference to FIG.

  FIG. 8 is a diagram showing a pixel of a liquid crystal display device disclosed in Patent Document 4 below.

The liquid crystal display device disclosed in the following Patent Document 4 includes a plurality of gate signal lines 60 formed on an insulating substrate and a plurality of drain signal lines 6 formed to intersect with the gate signal lines 60.
1 and the gate signal line 60 and the drain signal line 6 in the pixel region surrounded by these signal lines.
1 and a reflective electrode 63 connected to the thin film transistor 62. The reflective electrode 63 and the reflective electrode 63 in another pixel region adjacent to the reflective electrode 63 are overlapped on their sides. Thus, at least a light-shielding film 64 and a semiconductor layer 65 are sequentially stacked.

In the liquid crystal display device configured as described above, since the light shielding film 64 is formed between the reflective electrode 63 in each pixel region, a black matrix 66 having the same function is provided on the other insulating substrate side. You don't have to. This makes it possible to reduce the width of the light shielding film 64 without considering the overlay tolerance between one insulating substrate and the other insulating substrate, and to have a configuration in which the aperture ratio is improved. Further, since the semiconductor layer 65 is laminated above the light shielding film 64, reflection of extraneous light to the light shielding film 64 can be significantly reduced by the semiconductor layer 65.
Japanese Patent Laid-Open No. 11-101992 JP 2006-276111 A JP 2006-276112 A JP 2002-268060 A

On the other hand, in recent years, there has been a strong demand for improvements in the design of electronic devices. For example, in mobile phones, not only displays arbitrary images on the standby screen, but also a wide variety of items such as manufacturer logos and specific patterns. An image is displayed. When an image is displayed on the display unit of the liquid crystal display device, the liquid crystal display device needs to be driven and displayed while the power is on. for that reason,
In the conventional liquid crystal display device, when the power is turned off, nothing is displayed, and thus an image cannot be displayed. Therefore, such a conventional liquid crystal display device cannot realize a wide expression for displaying an image when the power is turned off.

Therefore, in order to display a standby screen or the like for a long time, it is necessary to continue driving a specific pixel for a long time, so that the power consumption increases accordingly. In this way, when the standby screen or the like is displayed for a long time, if it is a transflective liquid crystal display device as described above, it may be driven as a reflective type without lighting the backlight, but if the display time is still long As the length increases, the power consumption increases proportionally. Moreover, in a transmissive liquid crystal display device, even when a standby screen or the like is displayed, it cannot be visually recognized unless the backlight is turned on, so that power consumption becomes enormous. Such an increase in power consumption becomes a serious problem for small electronic devices such as mobile phones.

Further, since the transflective liquid crystal display device has a structure including both a light transmissive portion for displaying the sub-pixels with backlight light and a reflective portion for reflecting the incident light, the transmissive liquid crystal display device and In comparison, it is difficult to display a clear image and it is difficult to express a vivid color. For this reason, in a liquid crystal display device with a small size and high definition as seen in a liquid crystal display device such as a mobile phone with a photo function or a mobile phone with an image reproduction function, it cannot be displayed in a desired color. was there. Further, since the transflective liquid crystal display device has a light transmittance lower than that of the transmissive liquid crystal display device due to the presence of the reflective portion, it is necessary to increase the luminance of the backlight in a dark place, and the power consumption is further increased. There was also the problem of becoming larger.

In addition, the liquid crystal display device disclosed in Patent Document 4 has a high aperture ratio, but is a reflective or transflective liquid crystal display device. Therefore, it is difficult to display a predetermined image in a non-driven state. is there.

The present invention has been made in view of the problems of the prior art as described above.
An object of the present invention is to provide a normally white mode transmissive liquid crystal display device capable of displaying an arbitrary character or pattern when the liquid crystal display device is not driven.

In order to achieve the above object, a liquid crystal display device of the present invention is a normally white transmissive liquid crystal display device in which liquid crystal is sandwiched between a pair of substrates. A reflective plate is formed, a color filter layer is formed on the other of the pair of substrates, and a light shielding layer is formed at a position corresponding to the reflective plate, so that the transmissive liquid crystal display device is not driven. The sub-pixel in the region corresponding to the pattern that is desired to be displayed when in the state has a cut-out portion in which the light-blocking layer is partially cut out, and the cut-out portion of the light-blocking layer Is characterized in that the color filter layer is extended.

The transmissive liquid crystal display device of the present invention is a transmissive liquid crystal display device, and a reflector is partially formed on one of the pair of substrates for each sub-pixel. A light shielding layer is partially cut out on the other substrate corresponding to the portion where the reflecting plate is formed. In the portion where the light shielding layer of the other substrate is cut out, incident light from the outside is reflected by the reflecting plate formed on one substrate at a position corresponding to the portion where the light shielding layer is cut out, Comes out as reflected light. On the other hand, a color filter layer is formed to extend in a portion where the light shielding layer of the other substrate is cut out. Therefore, in the portion where the light shielding layer of the other substrate is notched, the incident light from the outside is extended to the portion where the light shielding layer is notched when being reflected by the reflecting plate and emitted. It comes out as reflected light having chromaticity corresponding to the color filter layer. The reflected light is inconspicuous when the liquid crystal display device is in the driving state (during transmissive display) because the display of the transmissive portion is bright, but is visible to the observer when the liquid crystal display device is in the non-driving state.

Furthermore, according to the transmissive liquid crystal display device of the present invention, the portion where the light shielding layer of the other substrate is partially cut out is arranged in correspondence with the pattern to be displayed, so that this portion is extended. The existing color filter layer enables a predetermined pattern to be reflected and displayed in a desired color. In this case, the intensity and chromaticity of the reflected light can be changed depending on whether a part or all of the light shielding layer of the sub-pixel in one pixel of the other substrate is cut out. Therefore, according to the transmissive liquid crystal display device of the present invention, when the liquid crystal display device is in a non-driven state, a predetermined pattern corresponding to each light reflection pattern can be easily displayed in a favorite color. . Note that the “predetermined pattern” in the present invention means a predetermined image to be displayed including characters, a logo mark of a company, a flower pattern, a checkered pattern, and the like.

In the transmissive liquid crystal display device of the present invention, the reflection plate formed on one substrate has a function of a light shielding layer when the liquid crystal display device is in a driving state. That is, the reflecting plate not only reflects incident light from the outside, but also can suppress light reflection between adjacent pixels and light leakage from the backlight. Thus, according to the transmissive liquid crystal display device of the present invention, it is possible to provide a transmissive liquid crystal display device capable of displaying a good image even when the light shielding layer is partially cut away.

Furthermore, according to the liquid crystal display device of the present invention, a part of the light shielding layer that is not used as a display portion in the conventional transmissive liquid crystal display device can be used as a light reflection region, and a display portion by reflected light can be obtained. Therefore, the area of the light reflecting reflector provided in the display area can be made smaller than that of the conventional transflective liquid crystal display device, so that the transmissive display area can be widened and clearer than the conventional transflective liquid crystal display device. A liquid crystal display device having a transparent display screen can be obtained.

In the normally white mode liquid crystal display device, the liquid crystal molecules are aligned in the direction regulated by the alignment film and transmit light in a non-driving state where no electric field is applied between the liquid crystal driving electrodes. It becomes white (bright) display. However, in a driving state in which an electric field is applied between the liquid crystal driving electrodes, the liquid crystal molecules are moved by the electric field, so that light is not transmitted and black (dark) display is obtained. In the transmissive liquid crystal display device of the present invention, the above-described configuration is applied to a normally white mode liquid crystal display device. Therefore, when the liquid crystal display device is in a non-driven state, the light shielding layer is partially cut away. In this case, when incident light from outside light is emitted, it is emitted as reflected light having a color layer color corresponding to the pattern such as an identification pattern, so a pattern with a predetermined hue is displayed in a white background. It can be displayed. As a normally white mode liquid crystal display device to which the present invention can be applied, for example, T
Examples include N (Twisted Nematic) type and ECB (Electrically Controlled Birefringence) type liquid crystal display devices.

In the transmissive liquid crystal display device of the present invention, an interlayer film is formed on one of the pair of substrates and a reflecting plate is formed on the surface of the interlayer film, and at least the reflecting plate is disposed. It is preferable that unevenness is formed on the surface of the interlayer film in the portion

Since the reflecting plate is formed on the surface of the interlayer film having irregularities, the reflecting plate is formed to have an irregular shape. If the unevenness is not formed on the reflecting plate, the reflecting plate becomes a mirror surface, and the image reflected by the incident light is reflected as it is, making it difficult to see the liquid crystal display screen. Therefore, if unevenness is formed at least on the surface of the interlayer film where the reflector is formed, the reflected light becomes diffusely reflected light, which makes it easy for the observer to visually recognize. The unevenness formed on the surface of the interlayer film may be provided at least in a portion where the reflecting plate is formed, but the unevenness may also be provided on the surface of the interlayer film where the reflecting plate is not formed. With such a configuration, the unevenness of the surface of the interlayer film is not conspicuous at the time of transmissive display, and it is necessary to manufacture the part where the unevenness is formed in a minute area of one subpixel and the part where the unevenness is not formed. Since it disappears, manufacture becomes easy.

In the transmissive liquid crystal display device of the present invention, the light shielding layer is preferably formed of a metal material or a carbon-containing resin.

According to the liquid crystal display device of the present invention, the light shielding layer can be formed at a low cost by forming the light shielding layer with a metal material such as chromium or a carbon-containing resin so-called resin black. Can be formed. Moreover, since it can produce by the method similar to a color filter layer if it is a resin-like light shielding layer, it is not necessary to provide a special manufacturing process.

In the transmissive liquid crystal display device of the present invention, it is preferable that the reflecting plate is smaller than the light shielding layer.

According to the transmissive liquid crystal display device of the present invention, the reflection plate is hidden by the light shielding layer in a plan view, and therefore incident light from the light transmission portion is not reflected. Therefore, display defects such as light leakage due to reflected light can be suppressed.

Hereinafter, the best embodiment of the present invention will be described with reference to the drawings. However, the embodiment described below shows an example of a normally white type transmissive liquid crystal display device for embodying the technical idea of the present invention, and the present invention is a transmissive type of this normally white type. It is not intended to be specific to a liquid crystal display device and is equally applicable to other embodiments within the scope of the claims. In each drawing used for the description in this specification, each layer and each member are displayed in different scales so that each layer and each member can be recognized on the drawing. However, it is not necessarily displayed in proportion to the actual dimensions.

FIG. 1 is a plan view showing the overall configuration of the liquid crystal display device of the embodiment. FIG. 2 is a schematic cross-sectional view taken along the line II-II in FIG. FIG. 3 is a plan view of the second substrate for one pixel. 4A is shown in FIG.
4 is a cross-sectional view taken along line IVA-IVA, and FIG. 4B is a cross-sectional view taken along line IVB-IVB in FIG. 5 is shown in FIG.
It is sectional drawing of the non-driving state to which V part of was expanded and represented. FIG. 6 is a sectional view of the driving state corresponding to FIG. FIG. 7A is a plan view showing a display screen in a non-driven state of the liquid crystal display device of the embodiment, and FIG. 7B is a plan view showing a display screen in a driven state.

As an embodiment of the present invention, a TN type normally white mode transmissive liquid crystal display device using TFTs as switching elements will be described with reference to FIGS. As shown in FIG. 1, the liquid crystal display device 10 is mainly composed of a liquid crystal panel 11 and a backlight 12. The liquid crystal panel 11 and the backlight 12 are arranged so as to overlap in plan view, and only the liquid crystal panel 11 is shown in FIG.

In this liquid crystal panel 11, an array substrate (first substrate) 13 and a color filter substrate (second substrate) 14 are bonded together by a sealing material 16, and a liquid crystal 15 is enclosed in a region partitioned by the sealing material 16. It has been configured. An injection port 17 for injecting liquid crystal is provided in a part of the sealing material 16, and the injection port 17 is sealed with a sealing material 18. The area inside the sealing material 16 is a display area 19 for displaying images, moving images, and the like.
In the display area 19, a plurality of sub-pixels 20 are provided in a matrix. A region between the plurality of sub-pixels 20 is an inter-pixel region 21. In the inter-pixel region 21, scanning lines (not shown) in the horizontal direction and signal lines (not shown) in the vertical direction are formed so as to intersect each other while being insulated from each other.

This array substrate 13 is slightly larger than the color filter substrate 14 and has both substrates 13,
A substrate having a size on which an overhang region 22 is formed when the 14 is bonded is used, and an IC chip 23 for driving a liquid crystal is mounted on the overhang region 22.

As shown in FIG. 2, the array substrate 13 covers a transparent substrate 29 made of a highly light-transmissive material such as glass or quartz, and a switching element 41 described later over the entire surface of the transparent substrate 29. Thus, the insulating film 30 made of silicon nitride, silicon oxide or the like is laminated.

Further, an interlayer film 31 made of an organic insulating layer is laminated on the insulating film 30 over the entire surface of the array substrate 13. A large number of irregularities 31 a are formed on the surface of the interlayer film 31. 2 and 4, the unevenness is formed on the entire surface of the interlayer film 31,
It may be formed only on a part of the surface of the interlayer film 31, for example, only on the part where the reflection plate 32 of the array substrate 13 is formed.

Then, for example, an aluminum metal or an aluminum alloy (for example, Al--) is partially applied to each subpixel so as to cover the surface of the portion where the scattering uneven portion 31a of the interlayer film 31 is formed.
Nd alloy. Hereinafter, both are collectively referred to as “aluminum alloy or the like”. ) Or the like, and a reflective plate 32 made of a reflective material is formed in an uneven shape. The concavo-convex portion formed on the surface of the reflecting plate 32 is provided to scatter and reflect incident light from the outside to improve the visibility of the display image during reflection display. Further, pixel electrodes 33 made of a transparent conductive material such as ITO (Indium Tin Oxide) or IZO (Indium Zinc Oxide) are formed on the surface of the reflecting plate 32 and the surface of the interlayer film 31 for each pixel. . The pixel electrode 33 is formed so as to cover the interlayer film 31 and, if necessary, the surface of the reflection plate 32. Further, an alignment film 34 is laminated so as to cover the entire surface of the substrate on which the pixel electrode 33 is formed. This pixel electrode 33
Of these, the portion where the reflecting plate 32 is formed forms the reflecting portion 43, and the portion where the reflecting plate 32 is not formed forms the light transmitting portion 42. In addition, outside of the transparent substrate 29 (the side opposite to the liquid crystal 15)
In addition, a first polarizing plate 28 is formed. Here, a linear polarizing plate is used as the first polarizing plate 28.

The switching elements 41 are disposed in the inter-pixel region 21 and are provided so as to correspond to the pixel electrodes 33 on a one-to-one basis. With such a configuration, the alignment direction of the liquid crystal 15 can be regulated independently for each sub-pixel 20. The switching element 41 is
For example, it is an element made of TFT, and is connected to a scanning line or a signal line. In addition, the alignment film 34
Is provided at the interface between the liquid crystal 15 and the pixel electrode 33 and is used to regulate the alignment direction of the molecules of the liquid crystal 15.

Next, the color filter substrate 14 is provided with a light shielding layer 37 on a transparent substrate 38, and the light shielding layer 37 is formed at a position corresponding to the reflection plate 32 of the array substrate 13. Further, corresponding to each pixel provided on the array substrate 13, for example, a color filter layer 40 made of red (R), green (G), and blue (B) is provided in a stripe shape. Further, a common electrode 36 and an alignment film 35 are laminated on the surface of the color filter layer 40. A second polarizing plate 39 is formed outside the transparent substrate 38 (on the side opposite to the liquid crystal 15). Here, a linear polarizing plate is used as the second polarizing plate 39, and its transmission axis is arranged so as to be perpendicular to the transmission axis of the linear polarizing portion of the first polarizing plate 28. And
The liquid crystal display device 10 is formed by sealing the liquid crystal 15 between the array substrate 13 and the color filter substrate 14.

Note that the transparent substrate 38 of the color filter substrate 14 is a rectangular plate-like member formed of a highly translucent material such as glass or quartz, for example, like the transparent substrate 29 of the array substrate 13.
As shown in FIGS. 3 and 4, the color filter layer 40 is a layer having a predetermined color provided on the liquid crystal 15 side of the transparent substrate 38 so as to overlap the sub-pixel 20 in plan view. The color filter layer 40 is composed of, for example, three color layers, a red layer 40R, a green layer 40G, and a blue layer 40B. However, the color filter layer 40 is not limited to three colors, and may be composed of layers of more colors, and a colorless layer may be provided.

One sub-pixel 20 is provided with a color filter layer 40 of one of the three colors, and the red layer 40R, the green layer 40G, and the blue layer 40B are arranged in adjacent columns. Here, three sub-pixels 20 that are adjacent to each other and have the color filter layers 40 of different colors form one set to constitute one pixel (one pixel).

The light shielding layer 37 is a light shielding member made of a metal material such as chrome capable of reflecting or absorbing light or a carbon-containing resin called so-called resin black, and the switching elements 41 of the array substrate 13, scanning lines and signals. It is provided around the color filter layer 40 for each sub-pixel 20 so as to shield the position facing the line. In the liquid crystal display device 10 according to the embodiment, as shown in FIGS. 3 and 4, a portion 37 a notched in the light shielding layer 37 is formed, and a color filter layer 40 described later is extended in that portion. A portion 44 is formed.

The common electrode 36 is an electrode formed of a transparent conductive material such as ITO or IZO, and is provided so as to cover the color filter layer 40 and the light shielding layer 37. Alignment film 35
Is provided at the interface between the liquid crystal 15 and the common electrode 36 for regulating the orientation direction of the molecules of the liquid crystal 15. The liquid crystal 15 is composed of liquid crystal molecules such as a fluorine-based liquid crystal compound and a non-fluorine-based liquid crystal compound, and is in contact with both the alignment film 34 on the array substrate 13 side and the alignment film 35 on the color filter substrate 14 side. It is sandwiched between both substrates.

In the liquid crystal display device 10 according to this embodiment, in the display region 19, the light shielding layer 37 is formed on the color filter substrate 14 at a position corresponding to the reflection plate 32 formed on the array substrate 13. Further, it is provided around the color filter layer 40. And FIG.
As shown in FIG. 4, in the sub-pixel 20 in the region corresponding to the pattern to be displayed when the liquid crystal display device 10 is in the non-driven state, the light shielding layer 37 is partially cut out. A portion 37 a is formed, and an extended portion 44 of the color filter layer 40 is formed in the cutout portion 37 a of the light shielding layer 37. 4A and 4B, the red layer 4
An example in which 0R is extended is shown.

Next, the operation of the portion 37a where the light shielding layer 37 around the sub-pixel 20 is cut will be described. As shown in FIGS. 5 and 6, the reflecting plate 32 is present on the array substrate 13 facing the portion 37 a where the light shielding layer 37 is cut out. In addition, an extended portion 44 of the color filter layer 40 is formed in the portion 37 a where the light shielding layer 37 is cut out.

In the liquid crystal display device 10 of this embodiment, the first polarizing plate 28 and the second polarizing plate 39 are used.
Are respectively composed of linearly polarizing plates, and are arranged in a direction in which the transmission axes are orthogonal to each other (crossed Nicols arrangement). In a state where no voltage is applied between the pixel electrode 33 and the common electrode 36, the linearly polarized light transmitted through the first polarizing plate 28 is rotated by 90 ° in the polarization direction by the liquid crystal 15, so that the second polarized light Since it can permeate | transmit the board 39, it becomes white (bright) display. Further, in the state where a voltage is applied between the pixel electrode 33 and the common electrode 36, the liquid crystal molecules rise vertically, so that the linearly polarized light transmitted through the first polarizing plate 28 maintains its polarization state. Although it reaches the second polarizing plate 39, the transmission axis of the second polarizing plate 39 is orthogonal to the transmission axis of the first polarizing plate 28, so that it cannot pass through the second polarizing plate 39 and is black ( (Dark) display. Therefore, the liquid crystal display device 10 of the first embodiment operates in a normally white mode.

  First, a case where the liquid crystal display device 10 is in a non-driven state will be described with reference to FIG.

Incident light 45 and 47 that has entered the portion 37 a of the reflective portion 43 where the light shielding layer 37 is cut from the outside (above) of the color filter substrate 14 is converted into linearly polarized light when it first passes through the second polarizing plate 39. Converted. The linearly polarized light then enters the reflector 32 through the red layer 40R of the extended portion 44 of the color filter layer 40, the common electrode 36, and the liquid crystal 15, but the liquid crystal 15
The direction of polarization is rotated by 90 ° when passing through. Further, the reflected lights 46 and 48 reflected by the surface of the reflecting plate 32 return to the first linearly polarized state by rotating the polarization direction by 90 ° when passing through the liquid crystal 15 again, and the common electrode 36 and the color filter layer 40. Then, the light passes through the red layer 40R of the extended portion 44 and enters the second polarizing plate 39 again. The reflected light 46 incident on the second polarizing plate 39 has its polarization direction parallel to the transmission axis of the second polarizing plate 39, so that it is emitted as red light. Can do. The one reflected light 48 is absorbed by the remaining part of the cut-out light shielding layer 37 and does not come out to the outside.

Thus, according to the liquid crystal display device 10 of the embodiment, the portion 37 in which the light shielding layer 37 is notched.
In (a), when the liquid crystal display device 10 is in a non-driven state, incident light 45 from the outside is reflected by the reflector 3.
2 is reflected to the outside as reflected light 46. Therefore, the color filter substrate 1
In the portion 37 a where the light shielding layer 37 of 4 is cut out, the incident light 45 from the outside is reflected by the reflector 3.
2 is reflected and emitted as reflected light 46 having chromaticity corresponding to the extended portion 44 of the color filter layer 40 disposed in the portion 37a where the light shielding layer 37 is notched. . Further, by arranging the portion 37 a in which the light shielding layer 37 of the color filter substrate 14 is cut out so as to have a pattern to be displayed, the reflected light 46 and 48 is reflected by the color filter layer 40.
Thus, the predetermined pattern can be displayed in a favorite color because it comes out through the extended portion 44 and the remaining portion of the cutout light shielding layer 37. Therefore, according to the liquid crystal display device of this embodiment, it is possible to display a pattern of a predetermined hue on a white background. This hue can be arbitrarily changed by changing the type and area of the color filter layer 40 from which the light shielding layer 37 is cut.

Further, since the reflecting plate 32 is formed smaller than the light shielding layer 37, the reflecting plate 32 is seen in plan view.
Is hidden by the light-shielding layer 37, so that the incident light from the light transmitting portion 42 is not reflected. Therefore, the reflected light 46 suppresses the transmission of the light transmitting portion 42 to the color filter layer 40, and leaks light. Display defects can be suppressed.

  Next, a case where the liquid crystal display device 10 is in a driving state will be described with reference to FIG.

The backlight 49 incident on the light transmission part 42 from the outside (below) of the array substrate 13 is converted into linearly polarized light when it first passes through the first polarizing plate 28. The linearly polarized light then enters the liquid crystal 15 through the insulating film 30, the interlayer film 31, and the pixel electrode 33, but the polarization direction is rotated by 90 ° when passing through the liquid crystal 15. Further, the light transmitted through the liquid crystal 15 passes through the common electrode 36 and the red layer 40R of the color filter layer 40 and enters the second polarizing plate 39.
The transmitted light that has entered the second polarizing plate 39 has its polarization direction parallel to the transmission axis of the second polarizing plate 39, and thus is transmitted to the outside as transmitted light 50 having a red color tone. be able to.

On the other hand, the backlight 51 incident on the reflecting portion 43 from the outside (below) of the array substrate 13 becomes reflected light 52 by the reflecting plate 32 and does not pass outside. The reflector 32 is the light shielding layer 3.
7, since light is not transmitted even in the portion 37 a in which the light shielding layer 37 is cut out, display defects such as light leakage can be suppressed. In this case, the reflecting plate 32 functions as the light shielding layer 37 in place of the notched portion 37 a of the light shielding layer 37.

When the liquid crystal display device 10 is in a driving state, a predetermined pattern is displayed by the portion 37a where the light shielding layer 37 is cut out, but the reflected light 4 from the portion 37a where the light shielding layer 37 is cut out.
6 (see FIG. 5) is not conspicuous because it is weaker than the light intensity of the backlight 49 during driving, and a good transmission image display can be performed using the display area 19.

An example of the state of the display area 19 when the power source of the liquid crystal display device 10 according to this embodiment is off and when the power source is on will be described with reference to FIGS. 7A and 7B. FIG. 7A shows a state in which the power source of the liquid crystal display device 10 is turned off, that is, a non-driving state. In this embodiment, FIG. 7A
As shown in FIG. 4, a symbol made of ABCDE is displayed as the identification pattern 55. That is, when the liquid crystal display device 10 is not driven, the background 53 is displayed in white, but in the portion 37a where the light shielding layer 37 is cut out, the reflected light 46 from which the incident light 45 is reflected by the reflecting plate 32 goes out. come.

Since the chromaticity of the reflected light 46 is determined by the chromaticity of the extended portion 44 of the color filter layer 40 existing in the cutout portion 37 a of the light shielding layer 37, the chromaticity of the reflected light 46 extends to the cutout portion 37 a of the light shielding layer 37. By appropriately selecting the chromaticity and area of the existing color filter layer 40, the reflected light 46 having a desired chromaticity can be generated. Further, a portion 37a in which the light shielding layer 37 is cut out.
If the extended portion 44 of the color filter layer 40 is colorless, the achromatic reflected light 4
6 and the predetermined pattern can be displayed in black and white. As described above, when the liquid crystal display device 10 is not driven, the reflected light 46 from the portion 37a in which the light shielding layer 37 is cut is observed by the user, so that the identification pattern 55 appears on the white background pattern 53 and is observed. Will be.

Further, the liquid crystal display device 10 according to the embodiment is turned on, that is, the pixel electrode 33.
FIG. 7B shows a display state of the display region 19 in a driving state in which a voltage is applied to the liquid crystal 15 between the common electrode 36 and the common electrode 36. When the liquid crystal display device 10 is driven, various images 54 such as normal moving images and still images can be displayed by the light 49 from the backlight 12 that has passed through the pixel electrodes 33. Even when the liquid crystal display device 10 is driven, the portion 37a in which the light shielding layer 37 is cut becomes reflected light having a hue corresponding to the pattern such as the identification pattern 55 when the incident light from the outside is emitted. Exit. However, when the liquid crystal display device 10 is in a driving state, the light shielding layer 37 is used.
Since the reflected light from the notched portion 37a is weak and inconspicuous, good image display can be performed by performing image display using the light 51 from the backlight 12 that has passed through the pixel electrode 33.

It is a top view which shows the whole structure of the liquid crystal display device of embodiment. It is a schematic cross section along the II-II line of FIG. It is a top view of the 2nd board | substrate for 1 pixel. 4A is a cross-sectional view taken along line IVA-IVA in FIG. 3, and FIG. 4B is a cross-sectional view taken along line IVB-IVB in FIG. It is sectional drawing of the non-driving state to which the V section of FIG. 4A was expanded and represented. It is sectional drawing of the drive state corresponding to FIG. FIG. 7A is a plan view showing a display screen in a non-driven state of the liquid crystal display device of the embodiment, and FIG. 7B is a plan view showing a display screen in a driven state. It is the figure which showed the pixel of the liquid crystal display device currently disclosed by patent document 4. FIG.

Explanation of symbols

10: Liquid crystal display device 11: Liquid crystal panel 12: Backlight 13: Array substrate 14
: Color filter substrate 15: Liquid crystal 16: Sealing material 17: Injection port 18: Sealing material 1
9: Display area 20: Subpixel 21: Interpixel area 22: Overhang area 23: IC chip 28: Polarizing plate 29: Transparent substrate 30: Insulating film 31a: Scattering uneven part 31: Interlayer film
32: Reflector 33: Pixel electrode 34: Alignment film 35: Alignment film 36: Common electrode 37:
Light shielding layer 38: Transparent substrate 39: Polarizing plate 40: Color filter layer 40B: Blue layer 4
0R: Red layer 40G: Green layer 41: Switching element 42: Light transmission part 43: Reflection part

Claims (4)

In a normally white type transmissive liquid crystal display device in which liquid crystal is sandwiched between a pair of substrates,
On one of the pair of substrates, a reflector is partially formed for each sub-pixel,
A color filter layer is formed on the other of the pair of substrates and a light shielding layer is formed at a position corresponding to the reflector,
The sub-pixel in the region corresponding to the pattern to be displayed when the transmissive liquid crystal display device is in the non-driven state is formed with a cut-out portion in which the light-shielding layer is partially cut out. The transmissive liquid crystal display device is characterized in that the color filter layer extends in a cutout portion of the light shielding layer. An interlayer film is formed on one of the pair of substrates, and a reflection plate is formed on the surface of the interlayer film, and at least a portion of the surface of the interlayer film where the reflection plate is disposed is uneven. The transmissive liquid crystal display device according to claim 1, wherein the transmissive liquid crystal display device is formed. The transmissive liquid crystal display device according to claim 1, wherein the light shielding layer is formed of a metal material or a carbon-containing resin. The transmissive liquid crystal display device according to claim 1, wherein the reflection plate is smaller than the light shielding layer.

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