JPH0618880A - Portable type data processor - Google Patents

Abstract

PURPOSE:To provide the portable type data processor which is easily visible by moderate brightness, and also, whose current consumption is small by adjusting luminance of a light source for illuminating a liquid crystal display device in relation to an external light. CONSTITUTION:The data processor is constituted by containing a liquid crystal display part 6 for displaying data by a semitransparent type liquid crystal display device, a liquid crystal illuminating part 7 for illuminating from the rear of the semitransparent type liquid crystal display device and displaying the data on the liquid crystal display part 6, a sensor 9 for measuring the quantity of the external light which is made incident on the semitransparent type liquid crystal display device, and an illumination luminance control part 8 for controlling illumination luminance of the liquid crystal illuminating part 7 in accordance with supply of a result of measurement of the sensor 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable data processing device, and more particularly to a portable data processing device for displaying a liquid crystal.

[0002]

2. Description of the Related Art A conventional portable data processing device uses a semi-transmissive liquid crystal display device as its display device so that it can be carried anywhere and used in a bright place or a dim place.

A light source behind the transflective liquid crystal display device illuminates the display device with a constant brightness.

[0004]

As described above, in the conventional portable data processing device, the illumination is performed by a light source having a constant brightness in a bright place or a dim place regardless of external light. In a dark place where the pupils of the eyes are open and the subject feels bright even with a small amount of brightness, there is a problem in that the amount of light emitted is too great to make it difficult to see brightly. This is
It is also a problem that it is too bright and consumes a lot of current.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a portable data processing device which adjusts the brightness of a light source for illuminating a liquid crystal display device in association with external light, has an appropriate brightness, is easy to see, and consumes less current.

[0006]

A portable data processing device according to the present invention comprises data display means for displaying data by means of a semi-transmissive liquid crystal display device and the data by illuminating from behind the semi-transmissive liquid crystal display device. Liquid crystal illumination means for displaying data on the display means, and external light amount measuring means for measuring the amount of external light incident on the semi-transmissive liquid crystal display device,
An illumination brightness control unit that controls the illumination brightness of the liquid crystal illumination unit according to the supply of the measurement result of the external light amount measurement unit.

[0007]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a portable data processing device of the present invention.

The portable data processing device of this embodiment is shown in FIG.
As shown in FIG. 2, a keyboard unit 1 for inputting data, a data storage unit 4 for storing input data and processed data, a liquid crystal display unit 6 for displaying data, and a program for controlling these are stored. A program storage unit 3 that is a read-only memory, a data processing unit 2 that executes the program and processes data, a liquid crystal illumination unit 7 that illuminates the liquid crystal display unit 6, and a sensor 9 that measures external light. An illumination brightness control unit 8 that controls the illumination brightness of the liquid crystal illumination unit 7 according to the measurement and a power supply unit 5 are included.

FIG. 2 shows an example of the brightness control characteristic of the illumination brightness control section 8. That is, it is a brightness control characteristic that controls the brightness of the illumination of the liquid crystal illumination unit 7 according to the ambient brightness measured by the sensor 9, that is, the amount of external light incident on the liquid crystal display unit 6.

The operation of this embodiment will be described with reference to FIGS. 1 and 2.

The liquid crystal device of the liquid crystal display unit 6 is a semi-transmissive type, and is displayed by external light and a light source at the rear, that is, illumination of the liquid crystal illumination unit 7.

If the surroundings are sufficiently bright, there is sufficient light from the outside to enter the liquid crystal display unit 6, the liquid crystal illumination unit 7 does not need to be originally turned on, and the illumination brightness control unit 8 turns off the liquid crystal illumination unit 7. Perform (part a in FIG. 2). The sensor 9 measures the amount of light from the outside and notifies the illumination brightness control unit 8 of it.

When the sensor 9 informs the illumination brightness control unit 8 that the ambient brightness has fallen below the above level and the amount of outside light has become less than a certain value, the illumination brightness control unit 8 turns on the liquid crystal illumination unit 7 (FIG. B part of 2).

When the amount of outside light becomes smaller,
The illumination brightness control unit 8 narrows down the brightness of the liquid crystal illumination unit 7 in accordance with the measurement amount of the sensor 9 (b to c portions in FIG. 2).

When the amount of outside light becomes considerably smaller and the surroundings become considerably darker, the illumination brightness control section 8 fixes the brightness of the liquid crystal illumination section 7 to a constant minimum brightness according to the measurement amount of the sensor 9 (FIG. 2). Part d).

By thus illuminating the liquid crystal display unit 6 in accordance with the external light, it becomes possible to follow the movement of the pupil of the human eye due to the ambient brightness, and the liquid crystal display is displayed at an appropriate brightness. Can be seen, and power consumption can be reduced when it is dark.

[0018]

As described above, the portable data processing device of the present invention adjusts the brightness of the light source for illuminating the liquid crystal display device in association with the external light, and displays with a more appropriate brightness than before. Can be seen and the current consumption can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a portable data processing device of the present invention.

FIG. 2 is a characteristic diagram showing an example of a brightness control characteristic of an illumination brightness control section 8 in the portable data processing device of this embodiment.

[Explanation of symbols]

 1 keyboard section 2 data processing section 3 program storage section 4 data storage section 5 power supply section 6 liquid crystal display section 7 liquid crystal illumination section 8 illumination brightness control section 9 sensor

Claims (2)

[Claims] 1. A data display means for displaying data by means of a semi-transmissive liquid crystal display device, a liquid crystal lighting means for illuminating from the rear of said semi-transmissive liquid crystal display device to display data on said data display means, and said semi-transmissive means. An external light amount measuring unit that measures the amount of external light incident on the transmissive liquid crystal display device, and an illumination brightness control unit that controls the illumination brightness of the liquid crystal illumination unit according to the supply of the measurement result of the external light amount measuring unit. A portable data processing device characterized by: 2. The illumination brightness control means activates the liquid crystal illumination means to start illumination when the measurement result of the external light quantity measuring means reaches a first value, and the measurement result is smaller than the first value. When it becomes less than or equal to the second value, the illumination brightness of the liquid crystal illumination means is set to a constant value, and as the measurement result decreases from the first value to the second value, the illumination brightness of the liquid crystal illumination means. The portable data processing device according to claim 1, wherein: