JPH11219156A - Information equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information equipment for controlling the brightness of a display means through the use of a light receiving element for data transmission in common to the detection of external light around the display means. SOLUTION: A light receiving element 24 receives an infrared signal 1X and external light 3X around a display element 35, and converts the signal 1X and light 3X into a voltage change. Then, the voltage change is decoded to a digital signal through a decoding circuit 25 and sent to an information processing circuit 23. The digital signal is as well sent to a sample hold circuit 31. On the other hand, output data sent from the information processing circuit 23, after coded through a modulation circuit 22, is transmitted to an I/O means 1 through a light emitting element 21 and a switching signal for a period of causing a light emitting element 24 to emit light is sent to the sample hold circuit 31. According to this construction, the sample hold circuit 31 samples output signals during an input data receiving period and holds the signal during an output data transmission period. At the same time, the data is averaged through a filter 32 and an external light circuit 33 controls a video signal 36 and a black level circuit 34 for adjusting the brightness of a display element 35.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information device using a cathode ray tube, a discharge tube, and a liquid crystal panel, and more particularly to an information device for adjusting brightness by a change in external light obtained from a light receiving element for infrared data transmission. .

[0002]

2. Description of the Related Art As shown in FIG. 3, a conventional information device using a cathode ray tube and a discharge tube has an input / output means for communicating input / output data by an infrared signal, and an infrared signal of output data from the input / output means. Light receiving element 24 for receiving 1X,
A demodulation circuit 25 for demodulating the infrared signal 1X received by the light receiving element 24 into output data, processing of output data demodulated by the demodulation circuit 25, and an information processing circuit 23 for outputting input data associated with the processing; A modulation circuit 22 for modulating the input data output from the processing circuit 23 into an infrared signal 2X; an information processing means 2 having a light emitting element 21 for transmitting the infrared signal 2X modulated by the modulation circuit 22 to the input / output means 1; A video circuit 3 for controlling display of input data and output data processed by the information processing means 2
6, a black level circuit 34 for adjusting the black level of the input data and the output data controlled to be displayed by the video circuit 36, a cathode ray tube for displaying the input data and the output data whose black level has been adjusted by the black level circuit 34, or A display element 35 formed by a discharge tube, an external light element 237 for receiving external light 3X of the display element 35, and a luminance of the display element 35 in proportion to the brightness of the external light 3X received by the external light element 237. And a display means 203 having an external light circuit 33 to be controlled.

As shown in FIG. 3, input and output data processed by the information processing means 2 are amplified by a video circuit 36 and displayed on a display element 35, as shown in FIG. The black level of the input data and the output data is adjusted by the black level circuit 34 and transmitted to the display element 35. Based on the external light signal proportional to the brightness of the external light obtained from the external light element 237, The external light circuit 33 controls the video circuit 36 and the black level circuit 34 to adjust the display brightness of the display element 35.

[0004]

However, in the conventional information equipment, it is necessary to provide an external light element for adjusting the brightness of the display according to the state of the external light, and the light receiving element used for the infrared signal transmission is required. In the element signal, there is a high-speed voltage change due to infrared signal transmission, it is necessary to distinguish the signal due to external light change, and in the case of bidirectional infrared signal transmission,
There is a problem that it is necessary to prevent erroneous detection of external light due to light from the light emitting element for data transmission.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an information apparatus for controlling the brightness of a display means by sharing a light receiving element for data transmission with detection of external light around the display means.

[0006]

In order to solve the above-mentioned problems, an information apparatus of the present invention comprises an input / output means for communicating input / output data by an infrared signal, and an infrared signal of output data from the input / output means. And a light receiving element for receiving external light, a demodulation circuit for demodulating an infrared signal received by the light receiving element to the output data, a process for the output data demodulated by the demodulation circuit, and an input data for the process. An information processing circuit for outputting, a modulation circuit for modulating the input data output from the information processing circuit into an infrared signal, and a light emitting element for transmitting the infrared signal modulated by the modulation circuit to the input / output means Information processing means, a video circuit for controlling the display of the input data and output data processed by the information processing means, and the input controlled to be displayed by the video circuit A black level circuit for adjusting the black level of data and output data; a display element formed of a cathode ray tube or a discharge tube for displaying the input data and output data whose black level has been adjusted by the black level circuit; A sample-and-hold circuit that outputs a detection voltage from the external light detected around the display element during a period excluding a period during which the light-emitting element transmits the infrared signal, and averages the detection voltage output from the sample-and-hold circuit And a display means including an external light circuit for controlling the video circuit and the black level circuit by the detection voltage averaged by the filter and controlling the luminance of the display element. Features.

In order to solve the above-mentioned problems, an information apparatus of the present invention comprises an input / output means for communicating input / output data by an infrared signal, and an infrared signal and external light of output data from the input / output means. A light receiving element for receiving, a demodulation circuit for demodulating an infrared signal received by the light receiving element into the output data, a processing of the output data demodulated by the demodulation circuit, and an information processing for outputting input data accompanying the processing A circuit, a modulation circuit that modulates the input data output from the information processing circuit into an infrared signal, and an information processing unit having a light emitting element that transmits the infrared signal modulated by the modulation circuit to the input / output unit. A control circuit for controlling the display of the input data and the output data processed by the information processing means; and the input data and the display data controlled by the control circuit. And a liquid crystal panel to display the force data,
A backlight for illuminating the liquid crystal panel, a sample-and-hold circuit for outputting a detection voltage from the external light detected around the liquid crystal panel during a period excluding a period during which the light emitting element transmits the infrared signal, A filter for averaging the detection voltage output from the hold circuit,
And a display unit having an external light circuit for controlling the brightness of the backlight with the detection voltage averaged by the filter.

[0008]

Next, an information apparatus according to a first embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an information device according to a first embodiment of the present invention.

As shown in FIG. 1, an information device according to a first embodiment of the present invention includes an input / output means 1 for communicating input / output data by an infrared signal, and an infrared signal of output data from the input / output means 1. 1X and a light receiving element 24 for receiving external light 3X, and an infrared signal 1 received by the light receiving element 24
Demodulation circuit 25 for demodulating X into output data, processing of output data demodulated by demodulation circuit 25, information processing circuit 23 for outputting input data associated with this processing, and input data output from information processing circuit 23 The infrared signal 2X
A light emitting element 2 for transmitting the infrared signal 2X modulated by the modulation circuit 22 to the input / output means 1.
1, a video circuit 36 for controlling display of input data and output data processed by the information processing means 2, and a black level of the input data and output data controlled by the video circuit 36. A black level circuit 34 for adjustment, a display element 35 formed of a cathode ray tube or a discharge tube for displaying input data and output data whose black level has been adjusted by the black level circuit 34, and a light emitting element 21 transmit an infrared signal 2X. During the period excluding the period, the display element 35
Sample and hold circuit 31 that outputs a detection voltage from external light 3X detected around the
A filter 32 for averaging the detection voltage output from the filter 32, and an external light circuit 33 for controlling the luminance of the display element 35 by controlling the video circuit 36 and the black level circuit 34 by the detection voltage averaged by the filter 32. And display means 3 provided.

Next, the operation of the information equipment according to the first embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the operation of the information device according to the first embodiment of the present invention is such that the light receiving element 24 generates the external signal 3X which changes according to the infrared signal 1X and the brightness around the display element 35. The demodulation circuit 25 decodes the voltage into a digital signal and sends it to the information processing circuit 23, and sends it to the sample-and-hold circuit 31 as a light receiving signal. On the other hand, after the output data sent from the information processing circuit 23 is encoded by the modulation circuit 22, it is sent to the input / output means 1 via the light emitting element 21 and a signal equal to a period during which the light emitting element 24 emits light is switched to a switching signal. To the sample and hold circuit 31.

Accordingly, the sample and hold circuit 31 receives the light receiving signal and the switching signal, samples the voltage value of the light receiving signal during the input data receiving period and holds it during the output data transmitting period. The output signal is averaged, and the voltage of the external light 3X is gradually changed with the elapse of time to change the external light 3X.
Converts the voltage signal from the filter 32 into a voltage value or a current value for driving the display element 35, reduces the luminance of the display element 35 when the external light 3X is large (when the surroundings are bright), and reduces the external light 3X. The video circuit 36 and the black level circuit 34 increase the brightness of the display element 35 when the amount is small (when the surroundings are dark).
Is controlled.

Next, an information device according to a second embodiment of the present invention will be described with reference to the drawings.

FIG. 2 is a block diagram of an information device according to a second embodiment of the present invention.

As shown in FIG. 2, an information device according to a second embodiment of the present invention has an input / output means 1 for communicating input / output data by an infrared signal, and an infrared signal 1X of output data from the input / output means 1. And light receiving element 24 for receiving external light 3X, and infrared signal 1X received by light receiving element 24
Demodulation circuit 25 for demodulating the signal into output data, demodulation circuit 2
5, an information processing circuit 23 for outputting the demodulated output data and input data associated with the processing, a modulation circuit 22 for modulating the input data output from the information processing circuit 23 into an infrared signal 2X, Light emitting element 21 for transmitting infrared signal 2X modulated by 22 to input / output means 1
And a control circuit 136 for controlling the display of input data and output data processed by the information processing means 2, and a liquid crystal panel for displaying the input data and output data controlled by the control circuit 136. 135
A backlight 134 for illuminating the liquid crystal panel 135,
During a period excluding a period during which the light emitting element 24 transmits the infrared signal 2X, a sample and hold circuit 31 that outputs a detection voltage from external light 3X detected around the liquid crystal panel 135, and a detection voltage output from the sample and hold circuit 31 The display device 103 includes a filter 32 for averaging and an external light circuit 33 for controlling the brightness of the backlight 134 based on the detection voltage averaged by the filter 32.

Next, the operation of the information equipment according to the second embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 2, the operation of the information device according to the second embodiment of the present invention is such that the light receiving element 24 outputs the infrared signal 1X and the external light 3X which changes according to the brightness around the liquid crystal panel 135. The demodulation circuit 25 decodes the voltage into a digital signal and sends it to the information processing circuit 23, and sends it to the sample-and-hold circuit 31 as a light receiving signal. On the other hand, after the output data sent from the information processing circuit 23 is encoded by the modulation circuit 22, it is sent to the input / output means 1 via the light emitting element 21 and a signal equal to a period during which the light emitting element 24 emits light is switched to a switching signal. Sample and hold circuit 31
Tell

Accordingly, the sample and hold circuit 31 receives the light receiving signal and the switching signal, samples the voltage value of the light receiving signal during the input data receiving period and holds the voltage value during the output data transmitting period. The output signal is averaged, and the voltage of the external light 3X is gradually changed with the elapse of time to change the external light 3X.
Converts the voltage signal from the filter 32 into a voltage value or a current value for driving the liquid crystal panel 135, and increases the brightness of the backlight 134 when the external light 3X is large (when the surroundings are bright). Each is controlled so as to lower the brightness of the backlight 134 when the amount is small (when the surroundings are dark).

In the embodiment of the present invention, the influence of the bidirectional output data is removed by the sample and hold circuit 31. However, when there is no data transmission means such as an infrared remote controller, the sample and hold circuit 31 is used. Needless to say, it can be reduced.

[0021]

As described above, according to the information equipment of the present invention, the light receiving element, which is the infrared transmitting means provided as the information transmitting means, is shared with the external light detecting means, so that it can be provided around the display means. There is an effect that the detected external light is averaged on a time axis through a low-frequency band-pass filter, the influence of a signal change during an output data transmission period is removed, and the luminance of the display element can be adjusted according to the change of the external light.

According to the information equipment of the present invention, the light receiving element, which is an infrared transmitting means provided as information transmitting means, is shared with the external light detecting means, so that external light detected around the display means can be reduced. There is an effect that the brightness of the backlight that illuminates the liquid crystal panel can be adjusted according to the change in external light by averaging the signal through the frequency band-pass filter on the time axis and removing the influence of the signal change during the output data transmission period.

[Brief description of the drawings]

FIG. 1 is a block diagram of an information device according to a first embodiment of the present invention.

FIG. 2 is a block diagram of an information device according to a second embodiment of the present invention.

FIG. 3 is a block diagram of a conventional information device.

[Explanation of symbols]

 Reference Signs List 1 input / output means 2 information processing means 3, 103 display means 21 light emitting element 22 modulation circuit 23 information processing circuit 24 light receiving element 25 demodulation circuit 31 sample hold circuit 32 filter 33 external light circuit 34 black level circuit 35 display element 36 video circuit 134 Backlight 135 Liquid crystal panel 136 Control circuit

Claims (2)

[Claims] 1. An input / output means for communicating input / output data by an infrared signal, a light receiving element for receiving an infrared signal and external light of output data from the input / output means, and an infrared signal received by the light receiving element. A demodulation circuit that demodulates the data into output data, a process of the output data demodulated by the demodulation circuit, an information processing circuit that outputs input data associated with the process, and an infrared ray that outputs the input data output from the information processing circuit. An information processing means having a modulation circuit for modulating a signal, a light emitting element for transmitting an infrared signal modulated by the modulation circuit to the input / output means, and an input data and an output data processed by the information processing means. A video circuit for performing display control; a black level circuit for adjusting a black level of the input data and the output data controlled by the video circuit; A display device the black level is formed by the cathode ray tube or discharge tubes for displaying the input data and output data adjusted by the bell circuit,
During a period excluding a period during which the light emitting element transmits the infrared signal, a sample and hold circuit that outputs a detection voltage from the external light detected around the display element, and averages the detection voltage output from the sample and hold circuit. Filter and the detection voltage averaged by this filter,
An information device comprising: an external light circuit that controls the video circuit and the black level circuit to control the luminance of the display element. 2. An input / output means for communicating input / output data by an infrared signal, a light receiving element for receiving an infrared signal and external light of output data from the input / output means, and an infrared signal received by the light receiving element. A demodulation circuit that demodulates the data into output data, a processing of the output data demodulated by the demodulation circuit, an information processing circuit that outputs input data associated with the processing, and an infrared data processing circuit that outputs the input data output from the information processing circuit. An information processing means having a modulation circuit for modulating a signal, a light emitting element for transmitting an infrared signal modulated by the modulation circuit to the input / output means, and an input data and an output data processed by the information processing means. A control circuit for performing display control; a liquid crystal panel for displaying the input data and the output data that are display-controlled by the control circuit; A backlight, a sample-and-hold circuit that outputs a detection voltage from the external light detected around the liquid crystal panel during a period other than a period in which the light-emitting element transmits the infrared signal, and a signal that is output from the sample-and-hold circuit. Display means comprising a filter for averaging the detected voltage, and an external light circuit for controlling the brightness of the backlight with the detected voltage averaged by the filter. Information equipment.