CN100371822C - Object projector with light compensation function - Google Patents

Abstract

A projector with optical compensation function includes an image capturing lens fixed on a base. The image capturing lens has a light source with adjustable brightness. The intensity of the backlight source is measured and an analog signal is output through the optical sensor positioned above the image capturing lens. The signal converter converts the received analog signal into a digital signal and outputs the digital signal. The brightness operation number is used for calculating and outputting a required light source brightness signal through optimization of an input digital signal of the background light source intensity. The light source controller controls the light source with adjustable brightness according to the signal output by the brightness operand.

Description

A physical projector with light compensation function

technical field

The invention relates to a physical projector, and in particular to a physical projector with light compensation function.

Background technique

The most commonly known auxiliary equipment for presentations is a projector using slides. With the advancement of technology, presenting aids that can be used now include LCD projectors, notebook computers and physical projectors.

Among them, the physical projector can present the target object (such as a file or object) to be presented on the projection screen without making an electronic image file or file first. The physical projector, by placing the object to be briefed within the imaging range of the digital lens, directly presents the captured image on the projection screen. Therefore, the physical projector can reduce the time required for the briefing staff to prepare the presentation data.

When the physical projector is in use, when the backlight is too strong, the object image on the projection screen will become black and difficult to identify. Therefore, manufacturers of physical projectors are eager to seek solutions to the above problems.

Contents of the invention

Therefore, the object of the present invention is to provide a physical projector with light compensation function to provide better projection effect.

According to the above-mentioned purpose of the present invention, a physical projector with light compensation function is proposed. The physical projector includes an image capture lens fixed on a base. The image capture lens has a light source with adjustable brightness. Measure the intensity of the backlight and output an analog signal through the light sensor located above the image capture lens. The signal converter converts the received analog signal into a digital signal output. The brightness operand takes the input digital signal of backlight intensity, calculates the required light source brightness signal through optimization, and outputs it. The light source controller controls the light source with adjustable brightness according to the signal output by the brightness operand. The light source with adjustable brightness can be a light source with multiple light emitting diodes or a light bulb with adjustable brightness.

From the above, it can be known that the application of the physical projector with light compensation function of the present invention can determine the intensity of the lens light source by measuring the intensity of the backlight and then performing an optimization calculation. This light source compensation function can prevent the problem of poor projection effect (the image of the object becomes black and difficult to identify) caused by excessive backlight, and further improve the projection effect.

Description of drawings

In order to make the above and other objects, features, advantages and embodiments of the present invention more comprehensible, the detailed description of the accompanying drawings is as follows:

FIG. 1 is a schematic diagram of a physical projector with light compensation function according to a preferred embodiment of the present invention; and

FIG. 2 is a block diagram of components related to the light compensation function in a physical projector according to a preferred embodiment of the present invention.

Description of main component marking

100: physical projector

102: Base

104: support frame

105: light controller

106: Image capture lens

107: Brightness operand

108: Light sensor

109: Signal Converter

110: backlight

112: lens light source

Detailed ways

In order to solve the problem of poor projection effect when the backlight source of the real projector is too strong (or too weak), the present invention proposes a real projector with light source compensation function, which can measure the size of the backlight of the real projector and calculate Optimized light source intensity enhances the projection effect.

Please refer to FIG. 1 , which is a schematic diagram of a physical projector with light compensation function according to a preferred embodiment of the present invention. The physical projector 100 captures the image on the document 114 through the image capture lens 106 . The image capture lens 106 is fixed on the base 102 through the supporting frame 104 . When the backlight source 110 is very strong, if the lens light source is added, the image of the object on the projection screen will often become black and difficult to identify. In this embodiment, the light sensor 108 is designed on the image capture lens 106 to measure the intensity of the backlight 110 . The signal measured by the light sensor 108 can be used for compensation when the lens light source 112 emits light.

Please refer to FIG. 2 , which is a block diagram of components related to the light source compensation function in a physical projector according to a preferred embodiment of the present invention. In order to achieve the above light compensation function, the present embodiment uses the components required to achieve this purpose as shown in the block diagram. The function of the light sensor 108 is to measure the intensity of the backlight 110 . The signal converter 109 is electrically connected to the light sensor 108, and receives an analog signal from the light sensor 108 and converts it into a digital signal. The brightness operand 107 is electrically connected to the signal converter 109 and receives a digital signal from the signal converter 109 . The brightness operand 107 is input through a digital signal, calculates and outputs a signal suitable for the optimized lens light source of the backlight at that time. The light controller 105 is electrically connected to the brightness operand and the lens light source 112 respectively, and receives a signal from the optimized lens light source of the brightness operand 107 . After receiving the signal of the lens light source, the light controller 105 controls the intensity of the lens light source to improve the projection effect.

For the components in the above block diagram, except for the light sensor 108 (located above the image capture lens 106 ) and the lens light source which need to be fixed, the positions of other components do not need to be designed in special positions. Implementation Mode The light controller 105, the brightness operand 107 or the signal converter 109 can be fabricated on a printed circuit board in the form of a circuit, or designed as an integrated circuit and then fixed on the printed circuit board. The aforementioned lens light source 112 must be a light source with adjustable brightness, such as a light source with multiple LEDs (the goal of adjusting brightness can be achieved by controlling the number of LED switches) or a light bulb with adjustable brightness.

From the above preferred embodiments of the present invention, it can be seen that the physical projector with light compensation function of the present invention can determine the intensity of the lens light source by measuring the intensity of the backlight and then through optimal calculation. This light source compensation function can prevent the problem of poor projection effect (the image of the object becomes black and difficult to identify) caused by excessive backlight, and further improve the projection effect.

Although the present invention has been disclosed above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make various modifications and improvements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be defined by the claims.

Claims (3)

1. A kind of physical projector with optical compensation function, it is characterized in that comprising at least: The image capture lens is fixed on the base, and the image capture lens has a light source with adjustable brightness; The light sensor is located above the image capture lens and receives the backlight; A signal converter is electrically connected to the light sensor, and the signal converter receives the analog signal from the light sensor and converts it into a digital signal; The brightness operand is electrically connected with the signal converter, the brightness operand receives the digital signal, and calculates the required light source brightness signal; A light source controller is electrically connected with the brightness operand, and the light source controller is electrically connected with the light-emitting source whose brightness can be adjusted, and controls its brightness. 2. The object projector according to claim 1, characterized in that the light source with adjustable brightness is a light source with a plurality of light emitting diodes. 3. The physical projector according to claim 1, characterized in that the light source with adjustable brightness is a light bulb with adjustable brightness.

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