CN2812499Y

CN2812499Y - Automatic brightness adjuster for display

Info

Publication number: CN2812499Y
Application number: CN 200520008962
Authority: CN
Inventors: 叶玉光
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-03-24
Filing date: 2005-03-24
Publication date: 2006-08-30
Anticipated expiration: 2015-03-24

Abstract

The utility model discloses an automatic brightness adjuster for display. It is connected with a power supply control circuit which provides the power for the display device. The utility model is a device which is used for the control of the output size of a voltage value. It mainly includes at least a light source detecting element and a voltage modulation circuit which is electrically connected with the light source detecting element and controls the size of the output voltage value according to the light source signal of the light source detecting element. It can automatically adjust the brightness of the display device according to the ambient light.

Description

The automatic brightness adjusting device of display

Technical field

The utility model has related to a kind of automatic brightness adjusting device of display, especially refer to that a kind of being arranged in can provide on the power control circuit of power supply to this display, include light source detecing element and voltage modulation circuit, can detect ambient brightness at any time and adjust the device of this display brightness automatically.

Background technology

Along with LCD is universal day by day, make in the utilization of LCD more extensive, because the shading value of LCD is controlled by the fluorescent tube projection of module backlight, therefore, tend to make screen and ambient light cause the phenomenon of light source contrast because of the difference of ambient light, when ambient light was too bright, its contrast of the picture that screen presented was comparatively not enough, makes that user's eye when watching screen is comparatively painstaking; When ambient light was too dark, the relative ambient light of the picture that screen presented was brighter, and so forceful rays will cause the discomfort of user's eye.

Though have displaying appliance to adjust shading value at present, yet all be manual adjustment screen shading value, and be to utilize microprocessor and the complicated control circuit of collocation, reach the brightness of the screen of adjusting display, not only use inconvenience and cost height.

Other has a kind of common technology, be when the user operates, CPU transmits a signal to the light sensing module, this light sensing module carries out sensing to the light source of outside, and result passback judged for CPU, and CPU exports the backlight control module to being about to judged result, makes it adjust the output mode backlight of display automatically in response to the external light source state., this common structure just can carry out the adjustment of display shading value after must triggering this equipment by the user in advance, is not sensing at any time, only is semi-automatic adjustment, and cooperates the backlight control module to reach automatic adjustment, the cost of parts height with CPU.

The utility model content

Problem to be solved in the utility model provides a kind ofly can adjust the brightness of this display automatically according to ambient light, and has the automatic brightness adjusting device of the display of designs simplification and advantage such as with low cost.It is located at can provide on the power control circuit of power supply to this display, and the automatic brightness adjusting device in order to control magnitude of voltage output size includes:

At least one light source detecing element, and

One is electrically connected with this light source detecing element, and can be according to the light source signal of this light source detecing element the voltage modulation circuit of control output voltage value size.

The utility model can be adjusted the brightness of display automatically according to ambient light, has designs simplification and advantage with low cost.

Description of drawings

Fig. 1 is the simple block schematic diagram of the utility model framework;

Fig. 2 is the control block schematic diagram of the utility model preferred embodiment;

Fig. 3 is the control block schematic diagram of another embodiment of the utility model;

Fig. 4 is the circuit diagram of the utility model automatic brightness adjusting device.

[main element symbol description]

(10) control circuit (11) light source detecing element

(12) power supply modulation circuit (120) variable resistor

(13) lighting device

(130) light-emitting component (131) drive circuit

(20) display (21) power circuit

(210) converter (211) voltage stabilizing circuit

Embodiment

As shown in Figure 1 to Figure 3, the automatic brightness adjusting device 10 of the utility model preferred embodiment, it is arranged in can provide on the power control circuit 21 of power supply to this display 20, and the device in order to control out-put supply value size includes:

At least one light source detecing element 11; And

One is electrically connected with this light source detecing element 11, and can control the voltage modulation circuit 12 of power supply quantity delivered according to the light source signal of this light source detecing element 11.

As shown in Figure 1 to Figure 3, when the utility model preferred embodiment was implemented, wherein, this power control circuit 21 comprised the converter 210 and a voltage stabilizing circuit 211 that AC power can be converted to DC power supply.

As shown in Figure 1 to Figure 3, when the utility model preferred embodiment is implemented, wherein, this converter 210 this automatic brightness adjusting device 10 of connecting with 211 of this voltage stabilizing circuits.

As shown in Figure 1, when the utility model preferred embodiment was implemented, wherein, this automatic brightness adjusting device 10 was series at 20 of this power control circuit 21 and this displays.

As depicted in figs. 1 and 2, when the utility model preferred embodiment was implemented, wherein, this brightness adjusting device 10 included a lighting circuit 13, and this lighting circuit 13 is parallel with one another with this voltage modulation circuit 12.

As shown in Figure 4, when the utility model preferred embodiment was implemented, wherein, this voltage modulation circuit 12 was to be composed in series mutually by variable resistor 120 and this light source detecing element 11.

As shown in Figure 4, when the utility model preferred embodiment was implemented, wherein, lighting circuit was formed (this drive circuit 131 can be electric crystal) by at least one light-emitting component 130 and the drive circuit 131 that can make this light-emitting component 130 produce start.

When the utility model preferred embodiment was implemented, wherein, this light source detecing element 11 was photo resistance.

When the utility model preferred embodiment was implemented, wherein, this display 20 was for including the LCD of display floater.

Shown in Fig. 2,3 and 4, when the utility model preferred embodiment is implemented in operation, when ambient brightness is higher, light source detecing element 11 can change according to ambient light makes its resistance decreasing, thereby make that the voltage drop on variable resistor 120 and the light source detecing element 11 is less relatively, cause the output voltage values of voltage modulation circuit 12 higher relatively, it is brighter that the display floater of LCD 20 will become, and so can improve because of environment and screen produce high contrast and cause user's eye to produce uncomfortable phenomenon to take place.

When ambient light is dark, light source detecing element 11 can change according to ambient light makes its resistance become big, thereby make that the voltage drop on variable resistor 120 and the light source detecing element 11 is relatively large, cause the output voltage values of voltage modulation circuit 12 relatively low, it is darker that the display floater of LCD 20 will become; Wherein,, then electric crystal 131 conductings also can be given conducting with light-emitting component 130 simultaneously, so can near keyboard be thrown light on by this light-emitting component 130 if the voltage drop on the light source detecing element 11 is bigger.

The above, it only is one of the utility model possible embodiments, be not in order to limiting claim of the present utility model, all acts according to the described content of claim, feature with and spirit and for it the equivalence of other variations implement, all should be contained in the claim of the present utility model.

Claims

1, a kind of automatic brightness adjusting device of display, it is connected in can provide on the power control circuit of power supply to the rear-projection fluorescent tube of this display, it is characterized in that this automatic brightness adjusting device includes:

The light source detecing element of the extraneous luminosity of at least one sensing; And

A voltage modulation circuit, this voltage modulation circuit is electrically connected with this light source detecing element, and can control the magnitude of voltage that gives this rear-projection fluorescent tube according to the sensing signal of this light source detecing element.

2, the automatic brightness adjusting device of display as claimed in claim 1 is characterized in that: described power control circuit comprises the converter and a voltage stabilizing circuit that AC power can be converted to DC power supply.

3, the automatic brightness adjusting device of display as claimed in claim 1, it is characterized in that: described power control circuit comprises the converter and a voltage stabilizing circuit that AC power can be converted to DC power supply, and this automatic brightness adjusting device of connecting between this converter and this voltage stabilizing circuit.

4, the automatic brightness adjusting device of display as claimed in claim 1 is characterized in that: described automatic brightness adjusting device is series between this power control circuit and this display.

5, the automatic brightness adjusting device of display as claimed in claim 1, it is characterized in that: described brightness adjusting device includes an auxiliary lighting apparatus again, this lighting device includes an illumination driving circuit and a light-emitting component, and this lighting device is in parallel with this voltage modulation circuit.

6, the automatic brightness adjusting device of display as claimed in claim 1 is characterized in that: described voltage modulation circuit includes a variable resistor of connecting with this light source detecing element.

7, the automatic brightness adjusting device of display as claimed in claim 1 is characterized in that: described light source detecing element is photo resistance.

8, the automatic brightness adjusting device of display as claimed in claim 1 is characterized in that: described display is the LCD that includes display floater.