JP2000193933A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the display device which can display a clear display picture both indoors and outdoors. SOLUTION: The display device is equipped with a reflection type liquid crystal display part 1 which has one surface 11 and the other surface 12 and a reflecting plate 2 which is provided on the side of the surface 11 of the reflection type liquid crystal display part 1 and reflects irradiating light 21 from the side of the surface 12, and displays a display picture with the reflected light from the reflecting plate 2. In this case, an irradiating light emission tube 3 which emits the irradiating light 21 is provided on the side of the surface 12 and a light emission luminance control part 5 controls the light emission luminance of the irradiating light emission tube 3 according to the peripheral luminance detection signal outputted by a luminance detection part 4 detecting the peripheral luminance on the side of the surface 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a programmable controller or a personal computer,
The present invention relates to a display device that displays a display screen for screen switching, data display, data setting, and the like.

[0002]

2. Description of the Related Art As a conventional example of this type of display device, FIG.
There exists a thing of a structure shown in FIG. This is a reflective liquid crystal display unit A having one surface A1 and another surface A2, and a reflective liquid crystal display unit A provided on one surface A1 side of the reflective liquid crystal display unit A and reflecting irradiation light B1 emitted from the other surface A2 side. And a reflection plate B.
The display screen is displayed with the reflected light B2 from.

More specifically, since the irradiation light B1 is reflected by the reflection plate B and the display screen is displayed by the reflection light B2, the irradiation light B1 is sunlight or the like having a large irradiation light amount, and the peripheral light on the other surface A2 side. When the brightness is high and bright, the display screen can be displayed easily so that it is generally used outdoors. However, when it is used indoors and the peripheral luminance on the other surface A2 side is low and dark, the display screen cannot be displayed.

[0004] As another conventional example of this type of display device, there is one having a configuration shown in FIG. This is a transmission type liquid crystal display unit C having one surface C1 and another surface C2, and a transmission type liquid crystal display unit provided on one surface C1 side of the transmission type liquid crystal display unit C and transmitting the transmission light D1 via a light guide plate D2. A transmission light emitting tube D that emits light at C is provided, and a display screen is displayed with the transmission light D1.

More specifically, since the display screen is displayed with the transmitted light D1 emitted from one surface C1 side via the light guide plate D2, the display screen can be displayed easily when the peripheral luminance on the other surface C2 side is low and dark. , So it is generally used indoors. However, the display screen cannot be displayed when it is used outdoors in a place with strong sunlight and the peripheral luminance on the other surface C2 side is high and bright.

[0006]

In the above-mentioned conventional display device, a model provided with a reflective liquid crystal display section A outdoors and another model provided with a transmissive liquid crystal display section C indoors are used. In other words, the display screen can be displayed by changing the model used indoors and outdoors.

However, the user must change the model indoors and outdoors, and when the developer constructs a system connected to a programmable controller or a personal computer, the user must reprogram to another model. No. Therefore, the developer needs management man-hours for managing the model and another model, and programming man-hours for reprogramming.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a display device capable of clearly displaying a display screen regardless of whether it is indoors or outdoors.

[0009]

In order to solve the above-mentioned problems, the present invention is directed to a reflective liquid crystal display having one surface and another surface and a reflective liquid crystal display provided on one surface of the reflective liquid crystal display. A reflection plate for reflecting irradiation light emitted from the other surface side, and displaying a display screen with the reflection light from the reflection plate. A brightness control section that is provided on the other side of the liquid crystal display section and controls the brightness of the illuminating light emitting tube based on the surrounding brightness detection signal output from the brightness detection section that detects the surrounding brightness on the other side. The configuration is provided.

According to a second aspect of the present invention, in the first aspect, the emission luminance control section controls a cycle of a lighting cycle of the irradiation light arc tube.

According to a third aspect of the present invention, in the first aspect, the emission luminance control section controls on / off of the irradiation light arc tube.

According to a fourth aspect of the present invention, there is provided a transmission type liquid crystal display unit having one surface and another surface, and a transmission type liquid crystal display unit provided on one surface side of the transmission type liquid crystal display unit and transmitting transmitted light through a light guide plate. In a display device for displaying a display screen with transmitted light, another transmitted light luminous tube that emits another transmitted light is provided on one surface side of the transmission type liquid crystal display unit. A configuration is provided in which a light emission luminance control unit that controls the light emission luminance of another transmitted light arc tube based on the peripheral luminance detection signal output from the luminance detection unit that detects the peripheral luminance on the other surface side is provided.

According to a fifth aspect of the present invention, in the light emitting device according to the fourth aspect, the emission luminance control section controls on / off of the another transmitted light arc tube.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.

Reference numeral 1 denotes a reflection type liquid crystal display unit having one surface 11 and the other surface 12 and controlling the molecular arrangement of liquid crystal sandwiched between two transparent electrodes by applying an electric field to obtain optical characteristics. Is changed to display a display screen composed of characters or images.

Reference numeral 2 denotes a reflection plate, which is provided on one side 11 of the reflection type liquid crystal display unit 1 by, for example, a metal plate polished to a mirror surface, and irradiates light 21 radiated from the other side 12 side to the reflection type liquid crystal display unit. The display screen is displayed on the reflective liquid crystal display unit 1 with the reflected light.

Reference numeral 3 denotes an irradiation light arc tube, which is formed by a cold cathode tube.
It is provided at both ends on the other surface 12 side of the reflection type liquid crystal display unit 1 and blinks at a predetermined lighting cycle (lighting frequency) and emits the irradiation light 21 toward the other surface 12 side of the reflection type liquid crystal display unit 1. I do.

Reference numeral 4 denotes a luminance detecting unit, which is a sensor for detecting luminance. The luminance detecting unit 4 is provided at a substantially upper center portion on the other surface 12 side of the reflection type liquid crystal display unit 1 and has a peripheral luminance on the other surface 12 side, that is, the other surface. The brightness on the side 12 is detected, and a surrounding brightness detection signal 41 corresponding to the surrounding brightness is output.

Reference numeral 5 denotes a light emission luminance control unit which is connected to the irradiation light emission tubes 3 and 3 and the luminance detection unit 4 and based on a peripheral luminance detection signal 41 output from the luminance detection unit 4, The light emission luminance of the irradiation light 21 is controlled by switching-controlling the irradiation light 3 and periodically controlling the lighting cycle of the irradiation light arc tube 3.

The case 6 is provided with an opening, and is disposed with the reflective liquid crystal display 1 exposed in the opening. Irradiation light 21 is incident from outside the other surface 12 of the reflective liquid crystal display 1. You.

The operation of this embodiment will be described with reference to FIGS. As shown in FIG. 2A, the luminance detecting unit 4 detects the peripheral luminance on the other surface 12 side and outputs a peripheral luminance detection signal 41 proportional to the peripheral luminance. Then, based on the peripheral luminance detection signal 41, the light emission luminance control unit 5 controls the cycle of the lighting of the irradiation light arc tube 3 to change the light emission luminance of the irradiation light 21 as shown in FIG. Is controlled so as to become lower as the value becomes higher, and to become higher as the peripheral luminance becomes lower.

Therefore, when installed indoors and the peripheral luminance on the other surface 12 side is low and dark, the irradiation light arc tube 3 emits the irradiation light 21 toward the other surface 12 with high emission luminance and the reflection plate 2
Reflects the irradiation light 21 from the irradiation light arc tube 3 to one surface of the reflection type liquid crystal display unit 1, and the reflection type liquid crystal display unit 1 displays a display screen with the reflection light from the reflection plate 2. Further, when the light source is installed outdoors and the peripheral luminance on the other surface 12 side is high and bright, the irradiation light arc tube 3 emits the irradiation light 21 toward the other surface 12 with low emission luminance, and the reflection plate 2 emits the irradiation light. The irradiation light 21 from the tube 3 and the irradiation light 21 from the outside are reflected on one surface, and the reflection type liquid crystal display unit 1 displays a display screen with the reflection light from the reflection plate 2.

In the display device of the first embodiment, as described above, the irradiation light luminous tube 3 for irradiating the irradiation light 21 is provided on the other surface 12 of the reflection type liquid crystal display unit 1 to emit the irradiation light. Since the light emission luminance control unit 5 for controlling the light emission luminance of the tube 3 is provided, when the peripheral luminance on the other surface 12 side is low and dark, the light emission luminance control unit 5 outputs the peripheral luminance detection signal 41 output from the luminance detection unit 4. The light emission brightness of the irradiating light arc tube 3 is increased based on one model to display the display screen clearly regardless of whether it is indoors or outdoors. Programming man-hours for programming can be reduced.

Further, the light emission luminance control unit 5 controls the irradiation light arc tube 3
, The lighting luminance of the irradiation light arc tube 3 can be accurately controlled.

A second embodiment of the present invention will be described below with reference to FIG. In the second embodiment, functions different from those in the first embodiment will be described, and members having substantially the same functions as those in the first embodiment will be denoted by the same reference numerals and description thereof will be omitted.

In the second embodiment, the light emission luminance control section 5 controls the light emission luminance by turning on and off the irradiation light arc tube 3 instead of controlling the cycle.

The operation of this embodiment will be described. As shown in FIG. 3A, the luminance detection unit 4 detects the peripheral luminance on the other surface 12 side, and when the peripheral luminance is higher than a predetermined luminance α, an H signal is output. A peripheral luminance detection signal 41 composed of a signal is output. As shown in FIG. 3B, the light emission luminance control unit 5 controls the irradiation light emission tube 3 based on the peripheral luminance detection signal 41 so that the irradiation light emission tube 3 is turned off and on when the irradiation light emission tube 3 is an H signal and an L signal, respectively. The emission luminance of the irradiation light 21 is controlled by on / off control. That is, the emission luminance is controlled so that the irradiation light arc tube 3 is turned off when the peripheral luminance is higher than the predetermined luminance α, and is turned on when the peripheral luminance is lower than the predetermined luminance α.

Therefore, when the reflection type liquid crystal display unit 1 is installed indoors and the peripheral luminance on the other surface 12 side of the reflection type liquid crystal display unit 1 is low and dark, the irradiation light arc tube 3 is turned on and the irradiation light 21 is emitted to the other surface 12 with high emission luminance. Then, the reflector 2 reflects the irradiation light 21 from the irradiation light arc tube 3 to the entire surface 11, and the reflection type liquid crystal display unit 1 displays a display screen with the reflection light from the reflector 2. In addition, when the device is installed outdoors and the peripheral luminance on the other surface 12 side is high and bright, the irradiation light arc tube 3 is turned off, and the reflection plate 2 reflects only the irradiation light 21 from the outside to the one surface 11 to form a reflection type liquid crystal. The display unit 1 displays a display screen with the reflected light from the reflection plate 2.

In the display device according to the second embodiment, as described above, since the emission luminance control section 5 controls the irradiation light emission tube 3 to be on / off, the emission luminance of the irradiation light emission tube 3 is simplified. Can be controlled by

A third embodiment of the present invention will be described below with reference to FIGS. In the third embodiment, functions different from those in the first embodiment will be described, and members having substantially the same functions as those in the first embodiment will be denoted by the same reference numerals and description thereof will be omitted.

Reference numeral 7 denotes a transmissive liquid crystal display unit having one surface 71 and the other surface 72, which controls the molecular arrangement of the liquid crystal sandwiched between two transparent electrodes by applying an electric field to obtain optical characteristics. Is changed to display a display screen composed of characters or images.

Reference numeral 8 denotes a first transmission light emitting tube, which is provided at each end on the one surface 71 side of the transmission type liquid crystal display unit 7 by a cold cathode tube, and transmits the first transmission light 81 through a light guide plate 82. Light is emitted to the transmission type liquid crystal display unit 7.

Reference numeral 9 denotes a second transmission light-emitting tube, which is provided at both ends on one surface 71 side of the transmission type liquid crystal display section 7 by a cold cathode tube in a state adjacent to the first transmission light-emitting tube 8, respectively. The second transmitted light 91 is emitted to the transmission type liquid crystal display unit 7 via the light guide plate 82.

The light emission luminance control unit 5 is connected to the luminance detection unit 4 and the two second transmitted light emission tubes 9, 9, respectively, and performs the second transmission based on the peripheral luminance detection signal 41 output from the luminance detection unit 4. The light emission tube 9 is turned on and off to control the emission luminance of the second transmitted light emission tube 9.

The operation of the above will be described. As shown in FIG. 5A, the luminance detecting unit 4 detects the peripheral luminance on the other surface 12 side of the transmissive liquid crystal display unit 7, and when the peripheral luminance is higher than a predetermined luminance α, the H signal, When it is low, the peripheral luminance detection signal 41 composed of the L signal is output. As shown in FIG. 5B, based on the peripheral luminance detection signal 41, the light emission luminance control unit 5 controls the second transmission light emission tube 9 to turn on and off when the H signal and the L signal are turned on, respectively. The light emission tube 9 is turned on and off to control the emission luminance of the second transmitted light 91.
That is, the second transmitted light arc tube 9 has a peripheral luminance of a predetermined luminance α.
The emission luminance of the second transmitted light 91 is controlled so as to be turned on when it is higher and to be turned off when it is lower than the predetermined luminance α.

Therefore, when installed indoors and the peripheral luminance on the other surface 72 side is low and dark, the second transmitted light arc tube 9 is turned off,
The transmissive liquid crystal display unit 7 displays a display screen using only the first transmitted light 81 from the first transmitted light arc tube 8. Also, when installed outdoors and the peripheral luminance on the other surface 72 side is high and bright, the second transmitted light arc tube 9 is turned on, and the reflective liquid crystal display unit 1
The display screen is clearly displayed by the first transmitted light 81 from the transmitted light emitting tube 8 and the second transmitted light 91 from the second transmitted light emitting tube 9.

In the display device according to the third embodiment, as described above, the second transmission light emitting tube 9 for emitting the second transmission light 91 is provided on the one surface 71 side of the transmission type liquid crystal display unit 7. Since the luminous luminance control unit 5 for controlling the luminous luminance of the second transmitted light luminous tube 9 is provided, when the peripheral luminance on the other surface 72 side is high and bright, the luminous luminance control unit 5 outputs the luminance output from the luminance detecting unit 4. Based on the brightness detection signal 41, the light emission brightness of the second transmitted light arc tube 9 is increased, so that the display screen is clearly displayed with one model regardless of whether it is indoors or outdoors. The number of management steps and the number of programming steps for reprogramming to another model can be reduced.

Further, since the light emission luminance control section 5 controls the second transmission light emission tube 9 on and off, the light emission luminance of the second transmission light emission tube 9 can be controlled with a simple configuration.

[0039]

According to the first aspect of the present invention, an illuminating light emitting tube for irradiating the irradiating light is provided on the other surface side of the reflective liquid crystal display unit, and the illuminating luminance control unit for controlling the luminous luminance of the irradiating light emitting tube is provided. Since the provided, when the peripheral luminance on the other surface side is low and dark, the emission luminance control unit increases the emission luminance of the irradiation light arc tube based on the peripheral luminance detection signal output from the luminance detection unit, and indoor or outdoor. In any case, since the display screen is clearly displayed with one model, the number of management steps for managing two models and the number of programming steps for reprogramming to another model can be reduced.

According to the second aspect of the invention, in addition to the effect of the first aspect, the emission luminance control unit controls the lighting cycle of the illuminating light luminous tube, so that the luminous luminance of the illuminating light luminous tube can be accurately controlled. Can be controlled.

According to the third aspect of the invention, in addition to the effect of the first aspect, since the emission luminance control section controls on / off of the irradiation light arc tube, the light emission luminance of the irradiation light arc tube can be controlled with a simple configuration. can do.

According to a fourth aspect of the present invention, another transmission light emitting tube that emits another transmission light is provided on one surface side of the transmission type liquid crystal display unit, and the light emission luminance of another transmission light emission tube is controlled. Since the control unit is provided, when the peripheral luminance on the other surface side is high and bright, the emission luminance control unit increases the emission luminance of another transmitted light arc tube based on the peripheral luminance detection signal output from the luminance detection unit. Since the display screen is clearly displayed with one model regardless of whether it is indoors or outdoors, the number of management steps for managing two models and the number of programming steps for reprogramming to another model can be reduced.

According to the fifth aspect, in addition to the effect of the fourth aspect, the emission luminance control section controls on / off of another transmission light arc tube, so that the emission luminance of another transmission light arc tube can be simplified. It can be controlled with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a first embodiment of the present invention.

FIG. 2A is a correlation diagram between an output value of a peripheral luminance detection signal and peripheral luminance, and FIG. 2B is a correlation diagram between peripheral luminance and emission luminance.

3A and 3B are diagrams showing an output of a peripheral luminance detection signal, and FIG. 3B is a diagram showing an on / off operation of an irradiation light arc tube corresponding to the output of a peripheral luminance detection signal, showing a second embodiment of the present invention.

FIG. 4 is a front sectional view showing a third embodiment of the present invention.

FIG. 5A is an output diagram of a peripheral luminance detection signal,
(B) is an ON / OFF operation diagram of the second transmitted light arc tube corresponding to the output of the peripheral luminance detection signal.

FIG. 6 is a front sectional view showing a conventional example.

FIG. 7 is a front sectional view showing another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reflective liquid crystal display part 11 One surface 12 Other surface 2 Reflector 21 Irradiation light 3 Irradiation light arc tube 4 Luminance detection part 41 Peripheral luminance detection signal 5 Emission luminance control part 7 Transmissive liquid crystal display part 71 One surface 72 Other surface 8 Transmitted light emitting tube (transmitted light emitting tube) 81 First transmitted light (transmitted light) 82 Light guide plate 9 Second transmitted light emitting tube (another transmitted light emitting tube) 91 Second transmitted light (another transmitted light)

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H093 NC44 NC45 NC55 NC90 ND08 ND58 NE07 NE10 NG01 5C006 AF63 BB28 BB29 BF38 EA01 FA54 5C094 AA07 AA45 AA54 AA55 BA43 DB10 ED01 ED11 GA10 HA01 5G435 EA15 BB12 DD11 FF08 FF12 LL19

Claims (5)

[Claims] A reflection type liquid crystal display having one surface and another surface; and a reflection plate provided on one surface of the reflection type liquid crystal display and reflecting irradiation light irradiated from the other surface. In a display device for displaying a display screen with reflected light from a plate, an irradiating light luminous tube for emitting the irradiating light is provided on the other surface of the reflective liquid crystal display unit, and a luminance for detecting a peripheral luminance on the other surface is provided. A display device, comprising: a light emission luminance control unit that controls light emission luminance of an irradiation light arc tube based on a peripheral luminance detection signal output from a detection unit. 2. The display device according to claim 1, wherein the light emission luminance control unit controls a lighting cycle of the irradiation light arc tube. 3. The display device according to claim 1, wherein the light emission luminance control section controls on / off of the irradiation light arc tube. 4. A transmissive liquid crystal display having one surface and another surface, and transmitted light emission provided on one surface of the transmissive liquid crystal display to emit transmitted light to the transmissive liquid crystal display via a light guide plate. A display device for displaying a display screen with transmitted light, wherein another transmitted light luminous tube for emitting another transmitted light is provided on one surface side of the transmission type liquid crystal display portion, and the peripheral brightness on the other surface side is provided. A display device provided with a light emission luminance control unit that controls the light emission luminance of another transmitted light arc tube based on the peripheral luminance detection signal output from the luminance detection unit that detects the luminance. 5. The light emission luminance control section controls on / off of the another transmitted light arc tube.
The display device according to the above.