CN2240163Y

CN2240163Y - Automatic background lighting calculator with display screen

Info

Publication number: CN2240163Y
Application number: CN 95213578
Authority: CN
Inventors: 黄邦俊
Original assignee: Truly Electronics Manufacturing Ltd
Current assignee: Truly Electronics Manufacturing Ltd
Priority date: 1995-06-23
Filing date: 1995-06-23
Publication date: 1996-11-13
Anticipated expiration: 2005-06-23
Also published as: JPH0916524A

Abstract

The utility model relates to an automatic background illumination light calculator with a display screen, comprising a keyboard (1), a microprocessor (2) and a liquid crystal display screen (3) which are jointed by circuits in sequence, and an automatic background light generation component (4). Because the utility model can automatically open and close the background illumination light for the liquid crystal display screen (3) according to the brightness of the environmental illumination, the application occasions of the calculators are widened. The utility model provides convenience for the continuous calculation and operation at the working situations with varied environmental brightness.

Description

Display screen automatic background optical illumination counter

The utility model is that relevant a kind of the utility model relates to a kind of improved counter, specifically, is a kind of counter that automatic open close display screen backgrounds illumination light function is arranged.

Present commercially available counter does not have automatically display screen to be provided the function of illumination bias light, though existing electron luminescence plate, therefore at some insufficient lights or do not allow the occasion of bright operation, the gloomy industry of the pilothouse of aircraft cockpit, main cabin, steamer and train etc., hospital, laboratory and ask for something bias light (spill, nightclub etc.) place for example, use counter quite to feel inconvenient, even can't use.

The purpose of this utility model provides a kind of counter that can control LCDs illumination bias light with the working environment light and shade automatically that has.

The utility model is achieved in that it comprises except that the keyboard, microprocessor and the LCDs that connect with circuit successively also having an automatic background light generation part.The existing market sale of this automatic background light generation part utilization comprise light sensation switch, excitation power supply and electron luminescence plate (electronic liquid crystal version, light emitting diode etc.), they connect mutually with circuit successively.The on off state of light sensation switch is determined by the bright situation at the utility model counter scene of living in.When insufficient light or leaden, the light sensation switch open makes exciting current work, thereby causes the electron luminescence plate luminous, provides bias light to LCDs.And under usual brightness, when the user can see display digit on the LCDs clearly, the light sensation switch cut out, and cuts off the work loop of exciting current, thereby the electron luminescence plate is not worked, and does not promptly provide bias light to LCDs.

The utility model has the advantages that: 1. the occasion of having widened that occasion that counter uses makes under the situation of insufficient light or can not bright environment having carried out operation also can normally be used; 2. easy to use, can not hinder the user to continue to calculate running because of using the bright dark variation of on-the-spot light.

The utility model is implemented by the following drawings.

Fig. 1 is a circuit structure calcspar of the present utility model.

Fig. 2 is the circuit theory diagrams of automatic background light generation part of the present utility model.

Fig. 3 is a structural representation of the present utility model.

Below we provide a fabulous embodiment of the present utility model according to Fig. 1-Fig. 3, and, further provide ins and outs of the present utility model in conjunction with this embodiment is described.

See also Fig. 1, as seen from the figure, the utility model comprises keyboard 1, microprocessor 2 and the LCDs 3 that connects mutually with circuit successively, and also has automatic background light generation part.

See also Fig. 2, as shown in the figure, automatic background light generation part 4 in the utility model comprises that the light sensation switch 41 that connects with circuit successively is composite structured, it is that the photosensitive amplifier 411, N-P-N type triode amplifier 412 and the P-N-P triode 413 that are made of phototriode Q1 and resistance R 1 connect successively and constitute, and is sealed in the feed circuit of excitation power supply 42 by triode 413.Like this, when ambient light is bright, 411 conductings of phototriode amplifier, and amplifier 412 is ended, thus triode 413 is ended, cut off the supply current of excitation power supply 42.Otherwise, when ambient light is not enough or gloomy, phototriode amplifier 411 is not worked, thereby make amplifier 412 obtain driving, owing to constitute the triode Q2 conducting of amplifier 412, make triode 413 obtain driving, thereby opened the power supply of excitation power supply 42, and finally make electron luminescence plate 43 shinny, provide the illumination bias light to LCDs 3.Excitation power supply 42 comprises oscillator 421 and the transformer 422 that connects mutually with circuit successively in the present embodiment.Triode Q3 in this oscillator 421 is a N-P-N type triode, the center tap of the primary coil of its emitter and transformer 422 joins, its collector joins through triode 413 and power supply, primary coil 4,221 one end ground connection, the other end links to each other with capacitor C 1, the other end of capacitor C 1 connects with base stage and the collector of triode Q3 with resistance R 3 mutually through resistance R 4 respectively, and capacitor C 2 cross-over connections are between the collector and base stage of triode Q3.

See also Fig. 3, from scheming as seen, electron luminescence plate 43 is installed in LCDs 3 limit afterwards, phototriode Q1 in the phototriode 41 in the light sensation switch 41 then is installed in the appropriate location of energy testing environment luminance brightness in the utility model, it is installed in the top, center of LCDs 3 in the present embodiment, it neither influences video data like this, also can reflect the ambient brightness on the display screen 3.Below we the row of the relevant component parameter in the present embodiment down:

R1＝150K， R2＝10K，R3＝680

R4＝10， R5＝4.7K

Q1 is PT370 type phototriode C1=6.8u, C2=0.047u

Claims

1. display screen automatic background optical illumination counter, comprise the keyboard (1), microprocessor (2), LCDs (3) and the electron luminescence plate (43) that connect mutually with circuit successively, it is characterized in that automatic background light generation part (4) that connects mutually with circuit in turn by light sensation switch (41), excitation power supply (42) and electron luminescence plate (43) in addition, and this electron luminescence plate (43) is installed in the back of LCDs (3); And have a phototriode Q1 to be installed on the appropriate location of an energy testing ambient brightness in this light sensation switch (41).

2. according to the described counter of claim 1, it is characterized in that set light activated switch (41) is the composite switch structure that comprises that the phototriode amplifier (411), N-P-N type triode amplifier (412) and the P-N-P type triode (413) that are made of resistance R 1 and phototriode Q1 are coupled to circuit successively.

3. according to the described counter of claim 1, it is characterized in that excitation power supply (42) comprises oscillator (421) and the transformer (422) that connects with circuit successively.

4. according to claim 1 or 2 described counters, it is characterized in that phototriode Q1 is installed on the LCDs (3).