JP3556902B2 - Liquid crystal display - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a liquid crystal display device used as a display panel of various electronic devices such as a timepiece and a portable information device.
[0002]
[Prior art]
Clocks that use a liquid crystal display panel to digitally display time information, such as hours, minutes, and seconds, and calendar information, such as date, day, month, and year, have been widely used in watches and table clocks equipped with a crystal oscillation circuit. Have been.
There is also a combination clock that combines an analog display in which time information is displayed with hands and a digital display in which time information and calendar information are displayed by numerals and characters.
[0003]
Further, analog timepieces have been proposed in which a dial is constituted by a liquid crystal display panel to selectively display various scale patterns, or to simulate the display of hands such as an hour hand, a minute hand, and a second hand (for example, a special timepiece). See Japanese Unexamined Patent Publication No. 54-153066.
In addition to watches, mobile phones, electronic desk calculators, portable game consoles, and various other electronic devices use a reflective panel that displays necessary information (character information and image information) as a small, very low power consumption reflective panel. Liquid crystal display devices are widely used.
[0004]
A conventional liquid crystal display panel as such a liquid crystal display device has a liquid crystal cell in which liquid crystal is sealed between two transparent substrates having electrodes on opposite inner surfaces, and an upper polarizing plate and a lower polarizing plate on both sides thereof. A polarizing plate is provided. When a voltage is applied between the electrodes of the pair of substrates of the liquid crystal cell and an electric field is applied, the optical characteristics of the liquid crystal change, and the transmission and absorption of light incident on the liquid crystal display panel are partially controlled to achieve a predetermined value. Is displayed.
Each of the upper and lower polarizers is a polarizer that absorbs linearly polarized light having a vibration plane orthogonal to the easy transmission axis.
In such a timepiece using a conventional liquid crystal display panel, in a normal normally white mode, time information and calendar information are displayed in black on a white background.
[0005]
[Problems to be solved by the invention]
However, simply displaying the time information and calendar information in a black (dark) display on a white (bright) ground in this way does not change the design, lacks an interesting taste, and is tired of consumers. For this reason, the consumption of digital display clocks has been declining in recent years. Also, combination clocks have not become very popular, and analog display clocks using liquid crystal display panels have not become widespread.
Similarly, liquid crystal display panels of other electronic devices generally display various information such as characters and images in a black display on a white background, and there are some which can perform a black-and-white reverse display in a reverse mode. Poor and lacked interesting taste.
The present invention has been made in view of such circumstances, and has as its object to provide a liquid crystal display device that has a change in design and can display information in various electronic devices such as a timepiece in a bright and easy-to-view manner.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a liquid crystal display device according to the present invention has a liquid crystal cell in which liquid crystal is sealed between two transparent substrates each having electrodes on opposing inner surfaces, and is disposed on the viewing side of the liquid crystal cell. A first reflective polarizing plate,A light diffusion layer disposed on the viewing side of the first reflective polarizing plate;A second reflective polarizer disposed on the side opposite to the viewing side of the liquid crystal cell; a backlight disposed on the opposite side of the liquid crystal cell with respect to the second reflective polarizer; And a semi-transmissive absorption plate provided between the first and second reflection-type polarization plates, wherein the first and second reflection-type polarization plates reflect a linearly polarized light having a vibration plane orthogonal to the easy transmission axis. That isFeatures.
[0007]
In each of the above-described liquid crystal display devices, it is desirable that the first reflection type polarizing plate and the second reflection type polarizing plate are arranged such that their easy transmission axes are orthogonal or parallel to each other.
The liquid crystal cell encapsulates a liquid crystal that modulates the phase of the transmitted linearly polarized light or modulates the intensity. The phase-modulating liquid crystal includes a twisted nematic liquid crystal and a super twisted nematic liquid crystal, and the intensity-modulating liquid crystal includes a guest-host liquid crystal.
Further, it is desirable that the first reflective polarizing plate is arranged such that its easy axis of transmission is parallel or perpendicular to the major axis direction of the liquid crystal molecules on the viewing side of the liquid crystal cell.
[0008]
In the liquid crystal display device according to the present invention configured as above, half of the incident light from the viewing side is reflected by the first reflective polarizer, but the other half passes through it and enters the liquid crystal cell, To change the optical characteristics partially when the light passes through the liquid crystal cell, to form a part that is totally reflected by the second reflective polarizing plate and a part that transmits the light, thereby performing a metallic display. Can be.
Whether the easy axes of transmission of the first and second reflective polarizers on both sides of the liquid crystal cell are orthogonal or parallel, or the easy axis of transmission of the first reflective polarizer is determined by the liquid crystal molecules on the viewing side of the liquid crystal cell. Depending on whether it is parallel or orthogonal to the long axis direction, or depending on the type of liquid crystal or voltage application, either the background part or the display segment part is a metal color by total reflection, and the other is a dark color by a light absorbing plate or any color It can be displayed in color, in a transparent state (the internal structure of the device is visible), or in the color of the light emitted from the backlight.
[0009]
For example, a liquid crystal cell in which first and second polarizers arranged vertically above and below a liquid crystal cell are arranged so that their easy transmission axes are parallel to each other, and the liquid crystal cell is filled with a twisted nematic liquid crystal having a twist angle of 90 degrees. The operation of the case of using is described.
Half of the light incident from the viewing side (upper side) of the liquid crystal cell is reflected by the first reflective polarizing plate. The other half enters the liquid crystal cell and passes through it, but in the background where no voltage is applied to the liquid crystal of the liquid crystal cell, the transmitted light is rotated by 90 degrees, so that the easy transmission axis of the second reflective polarizing plate is used. The polarized light is a linearly polarized light having a vibration plane orthogonal to the above, and is almost entirely reflected by the reflective polarizing plate. Therefore, the background portion is displayed in a metal tone (mirror shape).
[0010]
On the other hand, since a voltage is applied to the liquid crystal of the display segment portion for displaying various information such as time information and calendar information of the liquid crystal cell, light transmitted through the liquid crystal cell is not rotated, and the second reflective polarizing plate is not rotated. Since the light becomes linearly polarized light having a vibration plane in the same direction as the easy transmission axis, the light passes through the reflective polarizing plate and is absorbed by the surface of the backlight that is turned off. Therefore, the display segment is displayed dark. However, if a color is used on the surface of the backlight, only light of a specific color will be reflected. Is displayed. However, since half of the incident light is reflected by the upper polarizing sheet, the entire surface of the liquid crystal display panel has a slightly metallic tone.
[0011]
As described above, this display can be inverted so that the background portion is displayed in the color of the surface of the backlight and the display segment portion is displayed in a metal color.
For this reason, the liquid crystal display device according to the present invention can bring about a change in design, and can provide an interesting display, as compared with a conventional liquid crystal display device that displays character information and image information in black display on a white background. It is possible.
In the liquid crystal display device according to the present invention, since a backlight is provided instead of the light absorbing plate, a transmissive display can be performed at night or in a dark place.
[0012]
Further, since the transflective plate is provided between the backlight and the polarizing sheet adjacent to the backlight, the transmissive display by the backlight and the reflective display by the external light can be easily viewed.furtherA light diffusion layer (light diffusion plate) is provided outside the first reflection type polarizing plate.Because it was providedAnd diffuse the light reflected from the entire surface by the first reflective polarizing plate and the mirror-like reflected light from the information display section by the second reflective polarizing plate to suppress the metallic feeling and to make the display whiter and softer to make it easier to see. And the viewing angle characteristics are also improved.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a preferred embodiment of a liquid crystal display device according to the present invention will be described with reference to the drawings.
First, the basis of this inventionLiquid crystal displayFirst exampleWill be described with reference to FIG. 1 and FIG.
FIG. 1 is a schematic cross-sectional view showing the configuration of a liquid crystal display panel as the liquid crystal display device, in which the thickness and the interval between the liquid crystal cell and each polarizing plate are enlarged.
The liquid crystal display panel 10 shown in FIG. 1 has a liquid crystal cell 11, a first reflective polarizer 12 disposed on the viewing side (upper side in the figure), and a side opposite to the viewing side of the liquid crystal cell 11 (in the figure). It is composed of a second reflective polarizing plate 13 and a light absorbing plate 14 disposed on the lower side.
[0014]
As shown in FIG. 2, the liquid crystal cell 11 is sealed with a sealing material 4 so as to confine the liquid crystal 3 between the two glass substrates 1 and 2, and the liquid crystal 3 has a twist angle of, for example, 90 degrees or less. A nematic (TN) liquid crystal is used.
Transparent electrodes 5 and 6 made of indium tin oxide (ITO) are formed on the surfaces of the two glass substrates 1 and 2 on the side in contact with the liquid crystal 3 respectively. An orientation treatment is performed so that the molecules are oriented in a predetermined direction.
By applying a voltage between the electrodes 5 and 6 of the liquid crystal cell 11, the orientation of the liquid crystal 3 between the electrodes 5 and 6 is changed, and various information is digitally or graphically displayed.
[0015]
The first reflective polarizer 12 and the second reflective polarizer 14, which are vertically arranged with the liquid crystal cell 11 interposed therebetween, are arranged such that their easy transmission axes are parallel to each other.
Furthermore, they are arranged so that the easy transmission axis of the first reflective polarizing plate 12 and the long axis direction of the liquid crystal molecules on the viewing side of the liquid crystal cell 11 are aligned (parallel).
Each of the first and second reflective polarizing plates 12 and 13 is a polarizing sheet (reflective polarizing sheet) that reflects linearly polarized light having a vibration plane orthogonal to the easy transmission axis. As such a reflective polarizing sheet, for example, an optical film DBEF (trade name) manufactured by Minnesota Mining and Manufacturing Company in the United States is used. Available in Japan from Sumitomo 3M Limited.
[0016]
This reflective polarizing sheet has been developed by the above-mentioned manufacturing company and disclosed in Japanese Patent Publication No. 9-507308 (International Publication No. WO95 / 17691) and Japanese Patent Publication No. 9-511844 (International Publication No. WO95 / 27919). It is detailed.
According to the liquid crystal display panel of this embodiment, half of the light incident from above the liquid crystal display panel 10 in FIG. 1 is reflected by the first reflective polarizer 12 and half is transmitted. In a background portion for displaying character information and image information, since no voltage is applied to the liquid crystal 3 of the liquid crystal cell 11, half of the transmitted light is rotated by 90 degrees when transmitted through the liquid crystal cell 11. Since the light becomes linearly polarized light having a vibration plane orthogonal to the easy transmission axis of the second reflective polarizing plate 13, it is reflected by the second reflective polarizing plate 13.
[0017]
Therefore, in the background portion of the information display, almost all of the incident light is reflected, and the display becomes a metal tone (mirror shape).
In the display segment to which the voltage of the liquid crystal cell 11 for displaying character information and image information is applied, the light transmitted through the first reflective polarizer 12 is not rotated when transmitted through the liquid crystal cell 11, The light becomes a linearly polarized light having a vibration plane in the same direction as the easy transmission axis of the reflective polarizer 13, and is transmitted through the second reflective polarizer 13 and is absorbed by the light absorbing plate 14, so that the display is black (dark). Is done.
[0018]
If the light absorbing plate 14 is colored so as to reflect only a light component of a specific wavelength, various information can be displayed in any color.
Therefore, the liquid crystal display panel according to the present invention has a metal tone as compared with a conventional liquid crystal display panel that displays digital information such as time information and calendar information and various kinds of information in black (if dark) on a white (gray) background. Can be displayed in an arbitrary color tone on the background, so that the design can be changed, and the novel and interesting taste can be increased.
Also, the first and second reflective polarizers 12 and 13 arranged vertically above and below the liquid crystal cell 11 are arranged so that their easy transmission axes are orthogonal to each other so as to match the twist angle of the liquid crystal 3. For example, the brightness of the background portion and the display segment portion are reversed, and various information can be displayed in a mirror-like metal color in the background portion having an arbitrary color tone.
[0019]
Further, the light absorbing plate 14 in FIG. 1 is omitted, and the display segment portion or the background portion through which half of the incident light is transmitted becomes transparent, so that the internal structure of an electronic device such as a watch equipped with the liquid crystal display panel can be seen. You can also
The electrodes 5 and 6 of the liquid crystal cell 11 are formed in a plurality of segment patterns such as a 7-segment pattern for displaying numbers, and are not limited to a liquid crystal display panel that performs digital display. A liquid crystal display panel that displays various characters and figures by forming it in a dot matrixCan also be appliedOf course.
[0020]
The example in which the liquid crystal sealed in the liquid crystal cell 11 is a twisted nematic (TN) liquid crystal that phase modulates transmitted linearly polarized light has been described. It is also possible to use a guest host liquid crystal or the like.
The guest-host liquid crystal is a mixed liquid crystal in which a liquid crystal is used as a solvent and a dichroic dye is dissolved therein as a solute. When an electric field is applied to the liquid crystal molecules to change the orientation, the orientation of the dichroic dye can be controlled according to the movement of the liquid crystal molecules, and the display is performed by modulating the absorption of light incident from a certain direction. be able to.
Therefore, if this guest-host liquid crystal is applied as the liquid crystal 3 of the liquid crystal cell 11 in the above-described liquid crystal display panel, it becomes easy to colorize the display portion in the metal tone background.
[0021]
Next, the present inventionThe basis ofLiquid crystal display devices 2 toSixth exampleAbout FIGS. 3 toFIG.This will be described with reference to FIG.
These figures areBoth are liquid crystalFIG. 2 is a schematic cross-sectional view similar to FIG. 1 showing a different configuration example of a display panel. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.
[0022]
FIG.ThatLiquid crystal displaySecond example1 shows a configuration of a liquid crystal display panel. This liquid crystal display panel, like the liquid crystal display panel 10 shown in FIG. 1, has a first reflection type polarizing plate 12 and a second reflection type polarization plate, which are reflection type polarizing sheets, disposed above and below a liquid crystal cell 11, respectively. Although the plate 13 is provided, a backlight 15 is provided below the second reflective polarizing plate 13 instead of the light absorbing plate 14.
As the backlight 15, an electroluminescence (EL) element, a light emitting diode (LED) element, a cold cathode tube, a hot cathode tube, or the like is used.
[0023]
The display function of this liquid crystal display panel using external light is the same as that of the above-described liquid crystal display panel 10, but the light transmitting portion is displayed in the color of the surface of the backlight 15 instead of being displayed in the color of the light absorbing plate 14. Is done.
Further, if the backlight 15 is caused to emit light when external light is insufficient, the light is emitted to the viewing side (upward in FIG. 3) through the light transmitting portion, so that either the display segment portion or the background portion is backlighted. It is displayed brightly with 15 emission colors.
Therefore, if the backlight 15 emits red, green, yellow, or other colored light, or a combination of white light and a color filter is used, various color displays can be performed.
[0024]
FIG.ThatLiquid crystal displayThird example1 shows a configuration of a liquid crystal display panel. This liquid crystal display panel has a transflective plate 16 provided between the backlight 15 and the second reflective polarizer 13 adjacent to the backlight 15 in the liquid crystal display panel shown in FIG.
In this manner, the display of the reflection type by the external light is displayed in a scattered color of the transflective plate 16 so as to be easily viewed. The transmissive display by the backlight is also soft and easy to see because the light emitted by the backlight 15 is scattered and attenuated when transmitting through the transflective plate 16.
[0025]
FIG.ThatLiquid crystal displayFourth example1 shows a configuration of a liquid crystal display panel. In this liquid crystal display panel, an absorption polarizer 17 is arranged on the viewing side of the first reflective polarizer 12 of the liquid crystal display panel 10 shown in FIG.
The absorption polarizing plate 17 is a normal polarizing sheet that absorbs linearly polarized light having a vibration plane orthogonal to the easy transmission axis, and the direction of the easy transmission axis is set to the direction of the easy transmission axis of the first reflective polarizing plate 12. Arrange them so that they almost match the direction.
According to this liquid crystal display panel, half of the incident external light is absorbed by the absorbing polarizer 17 and the other half is directed to the first reflective polarizing plate 12 by a straight line having a vibration plane in the same direction as its easy transmission axis. Since the light is incident as polarized light, most of the light is transmitted without being reflected and enters the liquid crystal cell 11.
[0026]
Then, the light of the portion (background portion) that has been rotated by 90 degrees when transmitted through the liquid crystal cell 11 is reflected by the second reflective polarizing plate 13 and exits to the viewing side through the reverse route to the above, so that the metal Light of a portion (display segment portion) which is displayed in a tone and is not rotated when passing through the liquid crystal cell 11 passes through the second reflective polarizing plate 13.
The light transmitted through the reflective polarizing plate 13 is almost absorbed by the light absorbing plate 14 (which may be a layer or a sheet) disposed on the lower surface side, and there is no light reflected on the viewing side. It will be displayed black or dark.
[0027]
However, the light absorbing plate 14 may be omitted. In this case, the display segment becomes transparent, and the internal structure of the electronic device equipped with the liquid crystal display panel becomes visible, so that an interesting display is possible. . Alternatively, a light absorbing plate may be provided on the electronic device side. Further, if a white plate, a gray plate, or various colored plates (layers or sheets) are arranged in place of the light absorbing plate, white, gray, or any color that can be clearly distinguished from the metal color of the background portion by its diffuse reflection. Information can be displayed brightly and colorfully in color.
[0028]
This exampleAccording to the method, the display is somewhat darkened because almost no light is reflected by the first reflective polarizing plate 12, but the metal feeling (glossy) on the entire display portion can be suppressed, and the display can be easily viewed. The viewing angle characteristics are also improved.
In addition, if a color polarizer that mainly absorbs light of a specific wavelength among linearly polarized light having a vibration plane orthogonal to the easy transmission axis is used as the absorption polarizer 17, the brightness of the display is not significantly reduced. The metal feeling (gloss) of the entire display section can be suppressed, the display can be easily viewed, and the viewing angle characteristics can be improved.
[0029]
FIG.ThatLiquid crystal displayFifth example1 shows a configuration of a liquid crystal display panel. In this liquid crystal display panel, a light diffusion plate 18 is provided as a light diffusion (scattering) layer instead of the absorption type polarization plate 17 on the viewing side of the first reflection type polarization plate 12 of the liquid crystal display panel shown in FIG. Things.
The light diffusing plate 18 is formed by applying a mixture of silica particles, acrylic beads, or calcium powder, which is silicon oxide, in an adhesive on a transparent film-like substrate. Alternatively, it can be formed by embossing the surface of a transparent film. Such a film may be directly attached to the upper surface of the absorption type polarizing plate 12, or a light diffusing agent may be applied to form a light diffusing layer.
[0030]
In this way, the light reflected on the entire surface by the first reflective polarizer 12 and the mirror-like reflected light by the second reflective polarizer 13 are diffused to suppress the metallic feeling, and a soft and elegant display is achieved. And the viewing angle characteristics are also improved. However, the contrast between light and dark in the display is slightly reduced. Otherwise, it has the same display function as the liquid crystal display panel shown in FIG.
In this liquid crystal display panel, as in the case of the above-described fourth embodiment, the light absorbing plate 14 may be omitted or provided on the electronic device side, or a white plate or a gray plate may be used instead of the light absorbing plate. Alternatively, various colored plates (layers or sheets) may be arranged.
[0031]
FIG.ThatLiquid crystal displaySixth example1 shows a configuration of a liquid crystal display panel. In this liquid crystal display panel, instead of the light absorbing plate 14 of the liquid crystal display panel shown in FIG. 5, a semi-transmissive absorbing plate 16 is provided on the side opposite to the viewing side of the second reflective polarizing plate 13 (the lower side in the figure). And a backlight 15. The transflective plate 16 and the backlight 15 are shown in FIG.Third exampleThis is the same as that described above.
With this configuration, it is possible to easily perform the reflection type display by the external light and the transmission type display by the emission of the backlight 15.
Note that the semi-transmissive absorption plate 16 disposed between the backlight 15 and the second reflective polarizing plate 13 may be omitted.
[0032]
FIG. 8 shows a liquid crystal display device according to the present invention.One embodiment1 shows a configuration of a liquid crystal display panel. This liquid crystal display panel is shown in FIG. 7 instead of the light absorption plate 14 of the liquid crystal display panel shown in FIG. The liquid crystal display panel is provided with a semi-transmissive absorption plate 16 and a backlight 15 similarly to the liquid crystal display panel.FIG. 6 andThe liquid crystal display panel shown in FIG.It has the function of
This embodimentIn the above,First exampleVarious modifications described above can be similarly applied.
[0033]
[Application Example of Liquid Crystal Display Device According to the Present Invention]
here,The invention1 shows an example of a digital display type quartz timepiece to which a liquid crystal display panel as a liquid crystal display device according to the invention is applied.
FIG. 9 is a perspective view showing the appearance of the timepiece, and FIG. 10 is a sectional view showing the internal structure thereof.
The timepiece case 20 of the quartz timepiece is formed by joining a windshield glass 22 and a back cover 23 to a metal body 21.
[0034]
The windshield 22 is made of a transparent material such as sapphire glass, tempered glass, or a resin material, and is fitted to and joined to the front side of the body 21 via bonding or packing. The back cover 23 is fitted and joined to the back side of the body 21 via screwing or packing. As described above, the inside of the watch case 20 has an airtight structure so that dust and moisture do not enter.
A reflection type liquid crystal display panel (liquid crystal display device) 10 according to the present invention is provided on the windshield 22 side of the watch case 20 as a display unit for displaying time and the like.
[0035]
The liquid crystal display panel 10 includes a time display section 10a for displaying hours, minutes, and seconds, a calendar display section 10b for displaying months, days, and days of the week, and a colon mark display section 10c that blinks every second. is there. These display portions are formed by the segment patterns of the transparent electrodes 5 and 6 formed on the inner surfaces of the glass substrates 1 and 2 of the liquid crystal cell 11 shown in FIG.
In addition, a normal time display function of 12 hours or 24 hours, an alarm function, a stopwatch function, a timer function, and the like can be displayed.
The switching of the display function and the time correction are performed by operating a plurality of operation switches 24 provided on the body 21 of the watch case 20. The operation switch 24 is provided with a packing between the operation switch 24 and the body 21 so that dust and moisture do not enter the inside of the watch case 20.
[0036]
As shown in FIG. 10, a liquid crystal display panel 10 and a circuit board 30 are arranged substantially parallel to each other inside a quartz timepiece, as shown in FIG. A battery 31 is provided.
On the circuit board 30, a crystal oscillator 32 having an oscillation frequency of 32,768 Hz, a crystal oscillation circuit or a frequency dividing circuit for generating a predetermined signal by oscillating the crystal oscillator, and driving the liquid crystal display panel 10. , And a semiconductor integrated circuit 33 equipped with a central processing unit (CPU) for controlling the crystal clock.
[0037]
The liquid crystal display panel 10 and the circuit board 30 are electrically connected by a zebra rubber 34 disposed therebetween. Then, in order to ensure the electrical connection between the liquid crystal display panel 10 and the circuit board 30, the zebra rubber 34 is configured to be compressed in its thickness direction.
The zebra rubber 34 is formed by forming conductive layers containing carbon or metal particles in silicon rubber as an insulator at a constant pitch, and is electrically conductive in the thickness direction by each conductive layer. Is in an insulated state. The connection terminal patterns are formed on the opposing surfaces of the liquid crystal display panel 10 and the circuit board 30 at the same pitch size so as to correspond to the vertical conductive portions and the insulating portions formed by the conductive layers of the zebra rubber 34 being alternately arranged. Is formed.
[0038]
According to this timepiece, when external light is incident from the windshield 22 side (viewing side), time information such as hours, minutes, and seconds, date, day of the week, month, and year are displayed by the reflective liquid crystal display panel 10. Can be digitally displayed in various states (dark, white, various colors, or a state in which the internal structure of a timepiece can be seen through) in a metal-colored background portion.
Alternatively, the display state of the background portion and the information display portion can be inverted, and the time information, calendar information, and the like can be displayed in a metal tone.
As the liquid crystal display panel 10,The embodiment of the present invention described above with reference to FIG.LCD panelWear.
AndAnd the backlight 15Because it is provided, The backlight is turned on only when one of the operation switches 24 is pressed, and a transmissive display can be performed.
[0039]
【The invention's effect】
As described above, the liquid crystal display device according to the present invention can store various information in dark, white, various colors, or in a mirror-like or softened metal-tone background portion by the incidence of external light. Can be displayed in various states such as a state in which the internal structure of the camera can be seen through. BacklightBecause it is providedIn a dark place, a transmissive display can be performed.
Also, the display state of the background portion and the information display portion can be inverted, and characters, numerals, figures, and the like for displaying various information can be displayed in a metal tone.
Therefore, the liquid crystal display device according to the present invention can be applied as a display panel of various electronic devices including a digital display type quartz clock and other portable electronic devices. An electronic device with an interesting taste can be provided.
[Brief description of the drawings]
FIG. 1 is the present invention.The basis ofLiquid crystal displayFirst exampleIt is a typical sectional view showing composition of.
FIG. 2 is an enlarged sectional view showing the configuration of the liquid crystal cell.
FIG. 3The second exampleIt is a typical sectional view showing composition of.
FIG. 4Also the third exampleIt is a typical sectional view showing composition of.
FIG. 5Also the fourth exampleIt is a typical sectional view showing composition of.
FIG. 6Also the fifth exampleIt is a typical sectional view showing composition of.
FIG. 7Also the sixth exampleIt is a typical sectional view showing composition of.
FIG. 8 is a schematic sectional view showing the configuration of one embodiment of a liquid crystal display device according to the present invention.
FIG. 9 is an external perspective view of a quartz watch showing an application example of the liquid crystal display device according to the present invention.
FIG. 10 is a sectional view showing the internal structure.
[Explanation of symbols]
1, 2: glass substrate 3: liquid crystal
4: Sealing material 5, 6: Electrode
10: Liquid crystal display panel 10a: Time display section
10b: Calendar display section 10c: Mark display section
11: liquid crystal cell 12: first reflective polarizing plate
13: Second reflective polarizing plate 14: Light absorbing plate
15: backlight 16: semi-transmissive absorption plate
17: Absorption type polarizing plate 18: Light diffusion plate
20: Watch case 21: Body
22: Windshield 23: Back cover
24: Operation switch 30: Circuit board
31: Battery 32: Quartz resonator
33: Semiconductor integrated circuit 34: Zebra rubber

Claims (8)

A liquid crystal cell in which liquid crystal is sealed between two transparent substrates having respective electrodes to opposing inner surfaces, a first reflective polarizer disposed on the viewing side of the liquid crystal cell, the reflection type first A light diffusion layer disposed on the viewing side of the polarizing plate, a second reflective polarizing plate disposed on the side opposite to the viewing side of the liquid crystal cell, and the liquid crystal cell with respect to the second reflective polarizing plate. A backlight disposed on the opposite side, and a semi-transmissive absorption plate provided between the backlight and the second reflective polarizing plate,
The liquid crystal display device according to claim 1, wherein the first and second reflective polarizers are polarizing sheets that reflect linearly polarized light having a vibration plane orthogonal to an axis of easy transmission. The liquid crystal display device according to claim 1 ,
The liquid crystal display device, wherein the first reflective polarizing plate and the second reflective polarizing plate are arranged such that the axes of easy transmission are orthogonal to each other. The liquid crystal display device according to claim 1 ,
The liquid crystal display device, wherein the first reflection type polarizing plate and the second reflection type polarizing plate are arranged so that the easy transmission axes are parallel to each other. The liquid crystal display device according to claim 1 ,
A liquid crystal display device in which the liquid crystal cell encapsulates a liquid crystal for phase-modulating or intensity-modulating transmitted linearly polarized light. The liquid crystal display device according to claim 4 ,
A liquid crystal display device, wherein the liquid crystal is a twisted nematic liquid crystal. The liquid crystal display device according to claim 4 ,
A liquid crystal display device, wherein the liquid crystal is a super twisted nematic liquid crystal. The liquid crystal display device according to claim 4 ,
A liquid crystal display device wherein the liquid crystal is a guest host liquid crystal. The liquid crystal display device according to any one of claims 1 to 7 ,
A liquid crystal display device, wherein the first reflective polarizing plate is arranged so that its easy axis of transmission is parallel or perpendicular to the major axis direction of liquid crystal molecules on the viewing side of the liquid crystal cell.

Images