JPH11118963A - Displaying device of electronic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a reporting device with superior contrast by providing a reflection-type polarization plate in a liquid crystal device, and by providing a light absorption plate at the lower part of the liquid crystal device. SOLUTION: A liquid crystal displaying device 10 consists of a reflection-type polarization plate 105, a polarization plate 104, a liquid crystal layer 103, an upper glass 101, and a lower glass 102. Furthermore, an absorption plate 11 for absorbing light passing through the liquid crystal displaying device 10 is arranged on the lower surface of the liquid crystal 10. Therefore, with the display of the displaying device 10, almost all light is reflected at a part where the light is turned off, and, on the other hand, almost all light is absorbed when the light is turned on, thus providing extremely clear signal display as in a case where the light is reflected by a mirror for transmission. Also, the displaying device 10 provides clear expression for the display surface even in the conventional reporting of alarm time and an unique display form that cannot be observed before.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device for displaying a warning.

[0002]

2. Description of the Related Art Hitherto, in electronic devices for notifying an alarm time, liquid crystal display devices have been widely used because of low current consumption. In addition, many improvements have been made to this liquid crystal display device, and electronic devices that perform color display using a color polarizing plate as well as the conventional polarized color (dark green) have been released.

As is well known, a conventional liquid crystal display device has two
The liquid crystal cell sandwiches the liquid crystal layer between two glass plates.
It has a structure in which two polarizing plates are bonded, and the incident light first becomes a half light component by the polarizing plate on the upper surface. And the light
The light that has passed through the liquid crystal layer after being rotated and further passed through the lower polarizing plate is further reflected by the lower reflecting plate, passes through the lower polarizing plate, the liquid crystal layer and the upper polarizing plate again, and becomes output light. .

When a voltage is applied to the liquid crystal layer and there is no optical rotation in the liquid crystal layer, the light is blocked by the polarizing plate on the lower surface, and the light is not reflected and output. Therefore, the reflected and output light passes through the lower polarizing plate, the liquid crystal cell, and the upper polarizing plate twice, respectively.

[0005]

However, as described above, the light of the portion where no voltage is applied to the liquid crystal layer becomes 50% by the polarizer on the upper surface, and in addition, each polarizer and the liquid crystal cell are constituted. It is clear that the number of times of passing through the glass is large and the amount of light is attenuated, so that the difference between the amount of reflected light and the amount of light in the non-reflected portion is reduced, and the contrast is reduced.

In order to increase the contrast amount, the path of reflected light is made as short as possible in principle, that is, reflected as soon as possible after passing through the liquid crystal layer.
It is clear that the amount of reflected light increases. An object of the present invention is to solve the above-mentioned problems and provide an alarm function and a notification function using a display device having higher reflection efficiency.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a clock device for clocking time, reporting an alarm time, and the like, and performing an alarm notification and the like according to an output signal of the clock device. In an electronic apparatus having a display device, the display device transmits a first axial light component on a plane and absorbs a second axial light component orthogonal to the first axial direction on the plane. The first on the plane in the same manner as the polarizing plate
A second polarizing plate that passes the light component in the axial direction and reflects the light component in the second axis direction that is orthogonal to the plane in the first axis direction, and a portion that is divided into a plurality of patterns and does not apply a predetermined voltage or more. There is a liquid crystal cell that passes the input optical axis component of the incident light as the output optical axis component of the output shaft rotated by 90 degrees or more, and passes the incident optical axis component of the incident light without rotation in the portion where a predetermined voltage or more is applied. The first axis of the first polarizer and the input optical axis of the liquid crystal cell coincide on a plane, and the first axis of the second polarizer and the output optical axis of the liquid crystal cell coincide on a plane. The first polarizing plate is adhered to the upper surface of the liquid crystal cell and the second polarizing plate is adhered to the lower surface, and the operation of the display device is controlled by the notification at the time of the alarm or the like.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention. This embodiment is applied to a timepiece display type timepiece. FIG. 1 is a plan view of a pointer display type timepiece according to the present embodiment. FIG. 2 is an enlarged cross-sectional view of the liquid crystal display device used in the timepiece display type timepiece shown in FIG. FIG. 3 is a system diagram showing an outline of an entire system of the hands-type timepiece shown in FIG. FIGS. 4 and 5 are signal waveform diagrams schematically showing display drive signals of each display segment of the liquid crystal display device. FIG. 4 is a time signal diagram, and FIG. 5 is an emergency signal diagram.

In FIG. 1, reference numeral 10 denotes a liquid crystal display device.
It is located below the minute hand 30 and the hour hand 40. Further, the liquid crystal display device 10 has a quadruple-quadrant display segment arranged in a ring shape as shown in the figure. Each segment is a1,
a2, a3, a4, b1,..., b4, c1,.
4, d1,... D4. Reference numeral 50 denotes an external operation member for correcting the time of the hands-type timepiece and setting the alarm time.

FIG. 2 shows the cross-sectional structure of the liquid crystal display device 10 in detail. First, reference numeral 103 denotes a liquid crystal layer. When there is no applied voltage, the liquid crystal layer 103 has a characteristic that the light component in a plane direction parallel to the paper surface (incident angle direction 103A) is turned by 90 degrees to be a plane direction perpendicular to the paper surface (output angle direction 103B). . Reference numerals 101 and 102 denote an upper glass 101 and a lower glass 102 for holding the liquid crystal layer 103 therebetween. Lower glass 1
The electrode 102A is provided on the upper surface of the upper glass 02, and the electrodes 101A and 101B are provided on the lower surface of the upper glass 101. This structure is the same as the conventional liquid crystal cell structure, and a detailed description is omitted.

Reference numeral 104 denotes a polarizing plate similar to the conventional one, which passes only light components in a plane direction parallel to the paper surface (polarization direction 104A) and absorbs light components in a plane direction perpendicular to the paper surface as shown in the figure. The polarizing plate 104 is adhered to the upper surface of the upper glass 101. Reference numeral 105 denotes a reflection-type polarizing plate that passes only light components in a plane direction parallel to the paper surface (passing light direction 105A) and reflects light components in a plane direction perpendicular to the paper surface.
Similarly, the reflection type polarizing plate 105 is used for the lower glass 102.
Is adhered to the lower surface of.

As described above, the liquid crystal display device 10 includes the reflective polarizing plate 105, the polarizing plate 104, the liquid crystal layer 103, the upper glass 1
01 and the lower glass 102. Furthermore, in the electronic timepiece of the present embodiment, the liquid crystal display device 10
An absorbing plate 11 for absorbing light passing through the liquid crystal display device 10 is disposed on the lower surface of the liquid crystal display device 10.

[0013] Here, referring to FIG.
The light path in the absorbing plate 11 will be described. First, when the voltage applied between the electrode 102A disposed on the lower glass 102 and the electrode 101A disposed on the upper glass 101 is equal to or lower than a certain value (OFF state),
It is assumed that the voltage applied between the electrode 102A provided on the second glass 2 and the electrode 101B provided on the upper glass 101 is a certain value or more (ON state).

The incident light L becomes the first passing light M, which is a light component of only the polarization direction 104A by the polarizing plate 104.
The first passing light M is incident on the liquid crystal layer 103 in the incident angle direction 103.
Since the light component coincides with the light component A, the first passing light M turns 90 degrees by the liquid crystal layer 103 and passes through the liquid crystal layer 103 as light in the output angle direction 103B of the liquid crystal layer 103, that is, the direction perpendicular to the paper surface. This is referred to as second passing light N.

The second transmitted light N is reflected by the reflection type polarizing plate 105.
Reflected by The reflected light N1 turns 90 degrees by the liquid crystal layer 103 in the opposite direction to the incident path, becomes reflected light M1, and emits as reflected light L1 because it coincides with the polarization direction 104A of the polarizing plate 104. Therefore, the difference in the light amount between the incident light L and the reflected light L1 is only the amount of attenuation by the respective materials of the polarizing plate 104, the upper glass 101, and the lower glass 102, and is reflected with almost no attenuation.

Next, the electrode 10 disposed on the lower glass 102
It is assumed that the voltage applied between 2A and the electrode 101B disposed on the upper glass 101 is a certain value or more. At this time, the portion of the liquid crystal layer 103 sandwiched between the electrode 101B of the upper glass 101 and the electrode 102A of the lower glass 102 has
The 90-degree turning function as described above is lost. The first transmitted light M that has passed through the polarizing plate 104 in the same manner as described above
03 and the polarization direction 10 of the polarizing plate 104
The light of 4A passes through the liquid crystal layer 103 and becomes the second transmitted light N0.

The second transmitted light N0 is light having a component parallel to the paper surface and coincides with the passing direction 105A of the reflective polarizing plate 105. Therefore, the second transmitted light N0 passes through the reflective polarizing plate 105 and becomes the third transmitted light P
It becomes 0. The third passing light P0 is not absorbed and reflected by the absorbing plate 11. Therefore, the light incident on each segment a1,... D4 in the OFF state is not reflected at all, and each segment a1,.
The light incident on d4 is almost reflected.

FIG. 3 is a system diagram showing an outline of the entire system of the hand-held timepiece of this embodiment. Reference numeral 10 denotes the above-described liquid crystal display device. Reference numeral 12 denotes a display drive circuit that outputs a signal for driving the liquid crystal display device 10. 13
Are applied to the display drive circuit 12 to which segment electrode of each segment a1,... D4 described in FIG. 1 of the liquid crystal display device 10 or more than a predetermined voltage. Is a display instructing circuit for instructing whether or not to apply.

Reference numeral 14 denotes a normal clock circuit. The clock circuit 14 outputs a hand movement signal SP and a time report signal SJ. Reference numeral 15 denotes a pointer driving circuit, and reference numeral 16 denotes a pointer device. Hand movement signal SP output by the clock circuit 14
The hands, second hand 20, minute hand 30, and hour hand 40 of the pointer device 16 described with reference to FIG.

Reference numeral 17 denotes an external input circuit for outputting a correction operation signal BP for correcting the time of the clock circuit 14. The external input circuit 17 outputs a predetermined signal by operating the external operation member 50 described with reference to FIG. Therefore, the external input circuit 17 outputs the emergency signal notification operation signal BK by performing a predetermined operation on the external operation member 50. Here, the predetermined operation is an operation performed by a normal timepiece, and a detailed description thereof will be omitted.

FIG. 4 shows that the display instruction circuit 13 outputs the time report signal S.
FIG. 5 is a time signal diagram showing a display instruction signal of each segment output when J is input, and FIG. 5 is a display instruction signal of each segment similarly output when the display instruction circuit 13 inputs the emergency signal notification operation signal BK. It is an emergency signal diagram showing.

Therefore, the electronic timepiece of the present embodiment, as shown in FIG. 3, inputs the hand movement signal SP, which is the output of the clock circuit 14, to the hand drive circuit 15 as shown in FIG. Drive the pointer. The hands of the pointer device 16 indicate the second hand 20, the minute hand 30, and the hour hand 40 shown in FIG.

Next, when the clock circuit 14 outputs the time signal SJ to the display instruction circuit 13, the display instruction circuit 13
The display signal of each segment as shown in is output. FIG.
As shown in FIG. 1, the a1 segment in FIG. 1 is first turned on, that is, as described with reference to FIG. Therefore, the light entering the portion of the a1 segment is absorbed by the absorbing plate 11 and becomes black.

After 0.5 second, the a2 segment is similarly turned on. That is, it becomes black. In this manner, the segments a1 to d4 are sequentially turned on and black. As described with reference to FIG. 2, the part that is not lit is a state in which the light that has entered is almost reflected. When the external operation member 50 is operated here, the external input circuit 17 is operated.
Output the emergency signal notification operation signal BK. The emergency signal notification operation signal BK is input to the display instruction circuit 13. In response to this input, the display instruction circuit 13 periodically repeats the lighting state and the non-lighting state of all the segments a1 to d4 simultaneously with the signal waveform shown in FIG.

The reflective polarizing plate described above actually has DBEF (trade name) which is an optical film of Sumitomo 3M Limited as a commercial product. Further, the present invention can be implemented by a combination of a metal grid type polarizing plate (a metal grid having a pitch of 0.2 μm is formed on glass), a liquid crystal, and a retardation plate.

[0026]

By practicing the present invention in this manner, the display of the display device 10 has a non-lighting state in which most of the light is reflected, and a lighted state has
Most of the light is absorbed, and according to the display instruction signals shown in FIGS. 4 and 5, the appearance is the same as that of transmitting a signal by reflecting light with a mirror, resulting in a very clear signal display. . In particular, in the case of the display state by the emergency signal shown in FIG.
By setting the lighting interval between the ON state and the OFF state to mean the SOS signal, it is possible to confirm a distant place by reflection of sunlight or the like in an emergency.

Also, by using the display device 10,
Even in the notification of the alarm time in the related art, the expression on the display surface becomes clear, and it is clear that the display has a unique display form that has not been provided in the past.

[Brief description of the drawings]

FIG. 1 is a plan view of a pointer display type timepiece according to the present embodiment.

FIG. 2 is an enlarged cross-sectional view of a liquid crystal display device used in the hand-held timepiece shown in FIG.

FIG. 3 is a system diagram showing an outline of an entire system of the hands-type timepiece shown in FIG. 1;

FIG. 4 is a time signal diagram.

FIG. 5 is an emergency signal diagram.

[Explanation of symbols]

 Reference Signs List 10 display device 103 liquid crystal layer 105 reflective polarizing plate 104 polarizing plate 102 absorbing plate

Claims (1)

[Claims] 1. An electronic apparatus comprising: a clock device for measuring time, reporting an alarm time, and the like; and a display device for notifying an alarm or the like in accordance with an output signal of the clock device. A first polarizing plate that passes a light component in the first axis direction and absorbs a light component in the second axis direction that is orthogonal to the plane in the first axis direction;
A second polarizing plate that passes the light component in the axial direction and reflects the light component in the second axis direction that is orthogonal to the plane in the first axis direction, and a portion that is divided into a plurality of patterns and does not apply a predetermined voltage or more. There is a liquid crystal cell that passes the input optical axis component of the incident light as the output optical axis component of the output shaft rotated by 90 degrees or more, and passes the incident optical axis component of the incident light without rotation in the portion where a predetermined voltage or more is applied. The first axis of the first polarizer and the input optical axis of the liquid crystal cell coincide on a plane, and the first axis of the second polarizer and the output optical axis of the liquid crystal cell coincide on a plane. The first polarizer is adhered to the upper surface of the liquid crystal cell, and the second polarizer is adhered to the lower surface, and the operation of the display device is controlled by a notification at the time of the alarm or the like. Display device.