JPH07281155A - Lamp controller - Google Patents

Abstract

PURPOSE:To obtain a lamp controller constituted so that the light quantity of a lamp such as a back light used for a liquid crystal display is always optimally adjusted and the life thereof is prolonged. CONSTITUTION:The light quantity of the lamp 1 is detected by a light quantity detection means 3 and the ambient temperature of the lamp 1 is detected by an ambient temperature detection means 4. Then, the detected information thereof are transmitted to a control means 7. By the control means 7, information for setting light quantity is fetched from a light quantity adjustment circuit 5. Then, the light quantity of the lamp 1 is always kept constant by shifting a center value becoming the reference of the adjustment operation of the light quantity of the lamp 1 based on the respective information and controlling a lamp driving circuit 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lamp control device suitable for controlling the light quantity of a lamp in a liquid crystal display or the like.

[0002]

2. Description of the Related Art Conventionally, a lamp for a backlight used in a liquid crystal display may deteriorate depending on a use state, and a light amount may be insufficient to become dark. Further, although it is possible for the user to adjust the light amount, in that case, only the adjustment within a predetermined fixed range can be performed.

[0003]

By the way, in the conventional lamp control device, as described above, for example, the lamp for the backlight of the liquid crystal display deteriorates rapidly unless it is used under the optimum conditions, and the display is deteriorated. Since the density becomes darker, the user can adjust the light amount by themselves, but since it can only be adjusted within a fixed fixed range, it can be adjusted to the range the user wants to adjust when the lamp deteriorates. There was a problem that the range was shifted, and the usability for the user deteriorated.

The present invention has been made by paying attention to the above problems, and it is possible to always keep the light quantity of the lamp constant under the optimum condition, which is convenient and the life of the lamp is prolonged. It is intended to obtain a lamp control device capable of

[0005]

The lamp control device of the present invention comprises a driving means for driving the lamp, a light quantity detecting means for detecting the light quantity of the lamp, a temperature detecting means for detecting the ambient temperature of the lamp, and a lamp And a control unit for changing a central value serving as a reference for adjusting the light amount of the lamp based on the detection information from the light amount detecting unit and the temperature detecting unit and the adjustment information from the adjusting unit. It is a thing.

Further, the control means is provided with a memory for storing and holding the light quantity of the lit lamp.

[0007]

In the lamp control device of the present invention, the central value of the adjustment of the light quantity of the lamp is changed according to the light quantity of the lamp, the ambient temperature of the lamp and the adjustment information of the light quantity, and the light quantity of the lamp is always set to the optimum value. You can

[0008]

1 is a block diagram showing the configuration of a lamp control device according to an embodiment of the present invention. In the figure, 1 is a lamp used for a backlight for a liquid crystal display, 2 is a lamp drive circuit (driving means) for driving the lamp 1, 3 is light quantity detection means for detecting the light quantity of the lamp 1, 4
Is an ambient temperature detecting means for detecting the ambient temperature of the lamp 1, 5
Is a light amount adjusting circuit (adjusting means) for adjusting the light amount of the lamp 1.
Then, the light quantity is adjusted by the adjustment switch 6 so that the light quantity is set.

Reference numeral 7 is a control means for controlling the whole, which is detection information (light quantity, temperature) of the light quantity detecting means 3 and the ambient temperature detecting means 4 and adjustment information of the light quantity adjusting circuit 5 (set density by the adjusting switch 6). Based on the above, the central value that serves as a reference for the adjustment of the light amount is changed, the lamp 1 is driven by the drive circuit 2 under the optimum condition, and the light amount of the lamp 1 is controlled to be constant. Reference numeral 8 is a memory for storing and holding the light quantity of the lit lamp 1, and the stored information is retained even when the power is turned off.

In the above structure, the input power source is connected to the control means 7, the light quantity detecting means 3, the ambient temperature detecting means 4, the lamp drive circuit 2 and the light quantity adjusting circuit 5, respectively, and the input of the control means 7 is connected. The light amount detecting means 3 is provided at the terminal.
The light quantity adjusting circuit 5 and the output terminals of the ambient temperature detecting means 4 are connected to each other. Further, the control means 7 has a built-in memory 8 for storing the light quantity therein, and is further connected to the lamp 1 through its output terminal and the lamp drive circuit 2.

Next, the operation will be described.

When the lamp is turned on, the light quantity of the lamp 1 is detected by the light quantity detecting means 3, the light quantity information is A / D converted (analog-digital conversion), and then sent to the control means 7. Similarly, the ambient temperature of the lamp 1 is detected by the temperature detection means 4, the temperature information is A / D converted, and then sent to the control means 7. Further, the light quantity adjusting circuit 5 has the user input the density information desired by the user in digital quantity, and sends the information to the control means 7. Then, the control means 7 calculates the optimum condition of the lamp 1 based on the above three information, sends the control information to the lamp drive circuit 2 according to the result, and drives the lamp 1 by the information.

At this time, the control means 7 always stores the adjustment value of the light amount adjusting circuit 5, and the adjustment value is held even when the power is turned off. Then, based on the stored information, control is performed so as to shift the central value of the adjustment of the light amount according to the above-mentioned three information. As a result, the light amount of the lamp 1 such as a display is always kept constant under the optimum conditions, and the central value of the light amount is automatically shifted to prolong the life of the lamp 1, and at the same time improve the usability of the user. Can be achieved.

[0014]

As described above, according to the present invention, since the central value of the adjustment of the light quantity of the lamp is changed according to the light quantity of the lamp, the ambient temperature of the lamp and the adjustment information of the light quantity, the light quantity of the lamp is changed. Can be kept constant under optimum conditions, which is convenient and the lamp life can be extended.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 lamp 2 lamp drive circuit (driving means) 3 light quantity detection means 4 ambient temperature detection means 5 light quantity adjustment circuit (adjustment means) 6 adjustment switch 7 control means 8 memory

Claims (2)

[Claims] 1. A driving means for driving a lamp, a light quantity detecting means for detecting a light quantity of the lamp, a temperature detecting means for detecting an ambient temperature of the lamp, an adjusting means for adjusting a light quantity of the lamp, and the light quantity detecting means. And a control unit that changes a central value that serves as a reference for adjusting the light amount of the lamp based on each detection information of the temperature detection unit and the adjustment information from the adjustment unit. 2. The lamp control device according to claim 1, wherein the control means has a memory for storing and holding the light quantity of the lit lamp.