KR100930493B1 - Light pen and photosensitive liquid crystal display device having the same - Google Patents

Abstract

A light pen and a photosensitive liquid crystal display having the same are disclosed. The light pen has a pen shape and has a body having an opening for emitting light to an end. The drive pulse generation module is embedded in the body to generate a first pulse having a first frequency for a first time and to generate a second pulse having a second frequency for a second time. Inside the body, a light generating module for generating sensing light in a first flashing cycle by a first pulse and a second flashing cycle by a second pulse is embedded. Light having at least two different flashing frequencies is generated from the light pen, so that the photosensitive liquid crystal display panel can recognize the light provided from the operator more accurately, thereby preventing malfunction of the liquid crystal display panel.

Description

LIGHT PEN AND LIGHT-SENSITIVE LIQUID CRYSTAL DISPLAY DEVICE HAVING THE SAME}

1 is a conceptual diagram of a light pen according to a first embodiment of the present invention.

FIG. 2 is a waveform diagram illustrating first and second pulse waveforms generated by the driving pulse generation module illustrated in FIG. 1.

FIG. 3 is a conceptual diagram illustrating luminance of a light generating module by a pulse signal output from the driving pulse generating module illustrated in FIG. 1.

4 is a waveform diagram illustrating waveforms of a first pulse and a second pulse generated in the driving pulse generation module according to the second embodiment of the present invention.

FIG. 5 is a conceptual diagram illustrating luminance of a light generating module by a pulse signal output from the driving pulse generating module illustrated in FIG. 1.

6 is a partially cutaway perspective view of a light pen according to a third embodiment of the present invention.

7 is a conceptual diagram illustrating a light sensing liquid crystal display according to an embodiment of the present invention.

8 is a conceptual diagram illustrating a relationship between a light sensing liquid crystal display and a light pen.

The present invention relates to a light pen and a light sensing liquid crystal display device using the same, and more particularly, to a light pen and a light sensing liquid crystal display device having the same improved optical recognition rate in the light sensing liquid crystal display device.

In recent years, technology development of display devices has been developed along with technology development of information processing apparatuses. Various types of display devices have been developed such as CRT display devices, liquid crystal displays, and organic electroluminescent devices.

Most of the conventional display apparatuses unilaterally display data processed by the information processing apparatus, and thus, the operator cannot perform other commands to the information processing apparatus through the display apparatus while viewing the contents displayed on the screen. .

Recently, in order to overcome such limitations, display apparatuses capable of directly inputting data or performing other commands have been developed. Such a display device recognizes a local pressure applied to the display device mainly by an operator's hand or a touch pen. The display apparatus recognizes the pressure applied from the operator and sends a corresponding signal to the information processing apparatus, and the information processing apparatus processes the signal input from the display apparatus and sends a new image signal to the display apparatus. However, such a method greatly increases the thickness and weight of the display device and has a problem that it is difficult to perform precise work.                         

Recently, display apparatuses using light instead of pressure applied by an operator to express relatively precise characters or pictures or perform new commands have been developed.

This method mounts photo-sensing sensors with a small size on the display device in the form of a matrix, scans light to some of the photo-sensing sensors, and sends a signal that can be recognized by the information processing apparatus. Correspondingly, a new image is displayed from the display device.

In addition, to perform the display in this manner requires a light pen. The light pen has a light generating element for generating light. The operator scans the light generated by the light pen to the display device, and the display device sends a signal to the information processing device that the information processing device can recognize in response to the light generated by the light pen.

However, the light detecting sensor of the display device which performs the display in this manner frequently recognizes light generated from external light, for example, sunlight or indoor light as light generated from the light pen, thereby displaying an image that the operator does not want. I have a problem.

Accordingly, the present invention has been made in view of such a conventional problem, and a first object of the present invention is to provide a light pen which generates light flickering by at least two or more different frequencies.                         

A second object of the present invention is to provide a light sensing liquid crystal display for detecting light applied from a light pen which generates light blinking by at least two different frequencies.

In order to implement the first object of the present invention, the light pen according to the present invention has a pen shape and a body having an opening for emitting light to an end, a power supply module disposed in the body to supply power, and a body It is disposed inside the drive pulse generating module and the body connected to the power supply module to generate a first pulse having a first frequency for a first time and a second pulse having a second frequency for a second time. Provided is a light pen including a light generating module for generating sensing light in a first flashing cycle by a first pulse and in a second flashing cycle by a second pulse.

In addition, the liquid crystal display device according to the present invention in order to implement the second object of the present invention has a pen-shaped body having an opening for emitting light to the end, a power supply module disposed in the body to supply power; A drive pulse generation module connected to the power supply module in the body to generate a first pulse having a first frequency for a first time and a second pulse having a second frequency for a second time, and disposed inside the body And a light generating module for generating sensing light in a first flashing cycle and a second flashing cycle by a first pulse, a plurality of pixel areas for controlling an image of a liquid crystal, and the pixels. A liquid crystal display panel disposed between the regions and including sensing elements for sensing a scanning position of sensing light; an external device applied to the sensing elements Generating a first driving signal applied to a pixel region to display an image and a sensing signal processor including a signal comparing module for comparing the first sensing signal output by the second sensing signal and the second sensing signal output by the sensing light; Provided is a photosensitive liquid crystal display device including a driving signal generator for generating a second driving signal in response to a second sensing signal.

According to the present invention, even when various kinds of light are simultaneously supplied to the liquid crystal display panel in which the light sensing element is disposed, only the light supplied by the operator is selectively received to control the image as the operator intends.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Embodiments of the light pen

Example 1

1 is a conceptual diagram of a light pen according to a first embodiment of the present invention.

Referring to FIG. 1, the light pen 100 includes a body 110, a driving pulse generating module 130, and a light generating module 140. The light pen 100 may optionally include a power supply module 120.

The body 110 is manufactured in a hollow cylindrical shape, and one end of the body 110 is formed with an opening 112 for emitting light. The opening 112 has a circular shape, and the diameter of the opening 112 is smaller than the diameter of the body 110. The opening 112 is disposed with a tip 115 formed in a cylindrical flange shape. The tip 115 is in contact with the liquid crystal display panel and the like, and light is emitted to the tip 115. The tip 115 is retracted by being pressed by the liquid crystal display panel or the like, and is restored to its original position by being spaced apart from the liquid crystal display panel or the like. To implement this, a spring 115a is disposed at the rear of the tip 115. Meanwhile, the on / off switch 117 is connected to the tip 115. The switch 117, when the tip 115 is retracted, the power supply module 120 supplies power to the drive pulse generation module 130, and when the tip 115 returns, the drive pulse generation module from the power supply module 120. Power supplied to the 130 is cut off.

The power supply module 120 is optionally disposed inside the body 110. In this embodiment, the power supply module 120 outputs DC power. The power supply of the power supply module 120 preferably uses a battery or a mercury battery that can be easily replaced.

The driving pulse generation module 130 is disposed inside the body 110 and receives DC power from the power supply module 120. The drive pulse generation module 130 includes a circuit for converting DC power into a pulse waveform. In the present embodiment, the driving pulse generation module 130 outputs a first pulse having a first frequency for a first time and a second pulse having a second frequency for a second time.

FIG. 2 is a waveform diagram illustrating first and second pulse waveforms generated by the driving pulse generation module illustrated in FIG. 1.

1 or 2, the driving pulse generation module 130 outputs a first pulse 132 at a first frequency. In the present embodiment, the driving pulse generation module 130 outputs the first pulse 132 for the first time T ₁ . The first pulse 132 is called out by the drive pulse generation module 130 has a first pulse period (T _a), has a first pulse width (D _1).

On the other hand, the driving pulse generation module 130 outputs the second pulse 134 at a second frequency after the first time T ₁ elapses. In the present embodiment, the driving pulse generation module 130 outputs the second pulse 134 for the second time T ₂ . Therefore, the second pulse 134 generated in the drive pulse generation module 130 has a second pulse period T _b and has a second pulse width D ₂ .

At this time, the second frequency of the second pulse 134 is higher than the first frequency of the first pulse 132. Therefore, the second pulse width D ₂ is narrower than the first pulse width D ₁ , and the second pulse period T _b is shorter than the first pulse period T _a . The driving pulse generation module 130 alternately outputs the first pulse 132 and the second pulse 134.

The light generating module 140 is disposed to face the opening 112 in the body 110. The light generating module 140 may be a light emitting diode (LED) that generates light by a pulse generated by the driving pulse generating module 130, or a semiconductor device that generates a laser beam. Where light is generated among the light generating modules 140, a light collecting member 145 is further installed to condense the light generated by the light generating module 140 to further improve luminance. The light generating module 140 is turned on by the light generated by the driving pulse generating module 130 to generate or turn off the light.

FIG. 3 is a conceptual diagram illustrating luminance of a light generating module by a pulse signal output from the driving pulse generating module illustrated in FIG. 1.

2 or 3, the light generating module 140 rapidly changes the luminance at the first frequency during the first time T ₁ by the first pulse 132 generated from the driving pulse generating module 130. That is, it generates a sensing light flashing. In addition, the light generating module 140 generates sensing light that is rapidly changed in brightness at a second frequency, that is, blinking, for the second time T ₂ by the second pulse 134. Sensing light generated by different flashing cycles in the light generating module 140 is emitted to the outside through the tip 115 of the body 110.

According to the present exemplary embodiment, the light pen may generate light having a frequency different from that of sunlight or indoor lighting, thereby greatly improving the optical recognition rate of the display device including the light sensing element.

Example 2

4 is a waveform diagram illustrating waveforms of a first pulse and a second pulse generated in the driving pulse generation module according to the second embodiment of the present invention. Except for the pulse waveform generated in the drive pulse generation module in the present embodiment and the same description as in the first embodiment will be omitted detailed description.

1 or 4, the driving pulse generation module 130 outputs a first pulse 136 at a first frequency. The driving pulse generation module 130 outputs the first pulse 136 at a first intensity S ₁ for a first time T ₁ . Thus, the first pulse 136 generated in the drive pulse generation module 130 has a first pulse period (T _a) having a first pulse width (D _1).

On the other hand, the driving pulse generation module 130 outputs the second pulse 138 at the second frequency after the first time T ₁ elapses. The driving pulse generation module 130 outputs the second pulse 138 at a second intensity S ₂ higher than the first intensity S ₁ during the second time T ₂ . Accordingly, the second pulse 138 generated by the drive pulse generation module 130 has a second pulse period T _b and has a second pulse width D ₂ .

At this time, the second frequency of the second pulse 138 is higher than the first frequency of the first pulse 138. Therefore, the second pulse width D ₂ is narrower than the first pulse width D ₁ , and the second pulse period T _b is shorter than the first pulse period T _a .

The driving pulse generation module 130 alternately outputs the first pulse 136 and the second pulse 138.

FIG. 5 is a conceptual diagram illustrating luminance of a light generating module by a pulse signal output from the driving pulse generating module illustrated in FIG. 1.

Referring to FIG. 1, 4, or 5, the light generating module 140 has a first time T by the first pulse 136 having the first intensity S ₁ generated from the driving pulse generating module 130. ₁ ) generating a sensing light having a first brightness while flashing at a first frequency, followed by a second frequency for a second time T ₂ by a second pulse 138 having a second intensity S ₂ . Blinks to generate sensing light having a second brightness higher than the first brightness.

According to the present exemplary embodiment, the light flickering frequency of the light generated by the light generating module and the brightness of the light generated by the light generating module are different from each other, so as to be differentiated from sunlight or indoor lighting, and so on. The recognition rate can be greatly improved.

Example 3

6 is a partially cutaway perspective view of a light pen according to a third embodiment of the present invention.

Referring to FIG. 6, the light pen 100 includes a body 160 and an optical waveguide member 170. The body 160 is manufactured in a pen shape, and an opening 163 through which light is emitted is formed at the first end 165 of the body 160. The optical waveguide member 170 supplies sensing light generated from the outside of the body 160 to the inside of the body 160. The optical waveguide member 170 is an optical cable composed of at least one optical fiber.

The light incident part 172 in which the sensing light is incident among the optical waveguide members 170 is connected to a dummy pixel disposed in an invalid display area of the liquid crystal display panel to use sensing light generated from the dummy pixel.

Alternatively, the light incident part 172 to which the sensing light is incident among the optical waveguide members 170 may use light generated by a separate lighting device. In this case, the sensing light generated by the lighting device generates sensing light that blinks at different frequencies as shown in the first or second embodiment of the light pen.

On the other hand, the light exit portion 174 of the optical waveguide member 170 extends to the opening 163 portion of the body 160 to further improve the brightness of the light supplied to the optical fiber.

According to the present embodiment, the structure of the light pen can be made very simple, and the flashing frequencies of the light emitted from the light pen can be different from each other, so that the liquid crystal display can greatly increase the recognition rate of the light generated by the light pen.

Example 4

In the present embodiment, except for the driving pulse generation module, the same description as in the first embodiment described above will be omitted.

Referring back to FIG. 1, the light pen 100 generates sensing light that is distinguished from external light. To implement this, the sensing light is generated from the light pen 100 at a blinking frequency different from that of a commercial power supply.

For example, when the commercial power source has a frequency of 60 Hz and the external light generated using the commercial power source has a frequency of 60 Hz, the drive pulse generation module 130 of the light pen generates a flashing frequency different from that of the commercial power source. In addition, the light generation module 140 generates sensing light corresponding to the blinking frequency generated by the driving pulse generation module 130.

For example, when the commercial power source is 60 Hz, the drive pulse generation module 130 of the light pen 100 generates a flashing frequency of a frequency different from the commercial power source, for example, 50 Hz, and the light generating module 140 blinks. Generates flashing light corresponding to frequency. Thus, the sensing light generated by the light pen and the external light are distinguished.

For another example, when the commercial power source is 50 Hz, the driving pulse generation module 130 of the light pen 100 generates a flashing frequency of a frequency different from the commercial power source, for example, 60 Hz, and the light generating module 140 Generates flashing light corresponding to the flashing frequency. As a result, the sensing light generated by the light pen 100 and the external light are distinguished.

In the present embodiment, two examples have been described. However, as long as the frequencies generated by the commercial power supply and the driving pulse generation module are different, the object of the present invention can be realized.

Embodiment of Photosensitive Liquid Crystal Display

7 is a conceptual diagram illustrating a light sensing liquid crystal display according to an embodiment of the present invention. 8 is a conceptual diagram illustrating a relationship between a light sensing liquid crystal display and a light pen.

7 or 8, the photosensitive liquid crystal display 600 includes a liquid crystal display panel 200, a sensing signal processor 300, and a driving signal generator 400. Reference numeral 500 is an information processing unit.

The liquid crystal display panel 200 has a pixel area 210 for displaying an image. The pixel region 210 is disposed in a matrix form. For example, when the resolution of the liquid crystal display panel 200 performing a full color display is 1024 × 768, the pixel area 210 is formed of 1024 × 768 × 3 numbers. Referring to FIG. 8, the liquid crystal display panel 200 emits image light 601 including an image to the display surface 201.                     

In the liquid crystal display panel 200, the light sensing element 220 is disposed between the pixel regions 210. The photosensitive device 220 detects the sensing light 190 incident through the display surface 201 of the liquid crystal display panel 200. The sensing light 190 has a direction opposite to the image light 601. The photosensitive device 220 outputs an analog signal including the positional information into which the sensing light is input and applies it to the sensing signal processor 300.

The driving signal generator 400 is again composed of a driving control unit 410, a data driving module 420, and a gate driving module 430.

The driving control unit 410 receives a video signal generated from the information processing unit 500 and generates a gate driving signal and a data driving signal to display an image. The gate driving signal is applied to the gate driving module 430, and the data driving signal is applied to the data driving module 420.

The sensing signal processor 300 generates a control signal by processing the sensing signal applied from the light sensing element 220, and the driving control unit 410 applies the control signal to the information processing unit 500. The information processing unit 500 processes the control signal applied through the drive control unit 410 and applies a new video signal to the drive control unit 410.

By such a series of processes, the information requested by the operator is displayed on the liquid crystal display panel 200 as an image.

In this case, the photosensitive device 220 reacts sensitively to light. Therefore, when the worker works under sunlight or under a bright room lamp, external light is incident on the entire area of the liquid crystal display panel 200. The photosensitive device 220 outputs an analog sensing signal by the luminance or illuminance of the external light applied to the photosensitive device 200. The sensing signal output from the photosensitive device 220 by external light is frequently mistaken for the light generated by the light pen, so that an image which is not desired by the operator may be displayed on the liquid crystal display panel 200. Such malfunctions of the liquid crystal display are frequently generated especially under sunlight having a very high light intensity.

In order to prevent this, the sensing signal processor 300 is further provided with a sensing signal comparison module 310. The sensing signal comparison module 310 compares the intensity of the sensing light and the frequency of the sensing light input to the light sensing device 220 with a preset reference signal to distinguish between the external light and the light input by the operator through the light pen. The malfunction of the liquid crystal display due to external light is significantly reduced by the sensing signal comparison module 310.

For example, the detection signal processing unit 300 may be a light that is hard to occur naturally, for example, a worker blinks at a first frequency for a first time and flashes at a second frequency for a second time. It can be set to recognize the light input by the pen.

Unlike this, the sensing signal processor 300 recognizes light having a different frequency from a commercial power source, for example, a light flashing at a blinking frequency other than 60 Hz when the commercial frequency is 60 Hz. Can be set to

Since the light pen may be implemented by the first to fourth embodiments of the light pen described above, a more detailed description of the light pen will be omitted.                     

Hereinafter, the operation of the photosensitive liquid crystal display will be described.

First, the operator manually generates the sensing light from the light pen 100 shown in FIG. 1 or closely contacts the surface of the liquid crystal display panel 200 to generate the sensing light. The sensing light flashing at the first frequency is generated from the light pen 100 during the first time, and the sensing light flashing at the second frequency is generated during the second time. In this case, the first frequency and the second frequency required to generate light in the light pen 100 are different from each other, and the first time and the second time may be the same or different. Alternatively, it is also possible to generate a blinking frequency different from the commercial frequency from the light pen 100.

The sensing light generated by the light pen 100 is scanned by some of the light sensing elements 220 arranged in a matrix form on the liquid crystal display panel 200. The photosensitive device 220 in which the sensing light is scanned outputs an analog signal corresponding to the blinking frequency of the sensing light to the sensing signal processor 300.

The signal comparison module 310 of the sensing signal processor 300 compares the sensing signals applied by all the photosensitive devices 220 of the liquid crystal display panel 200 with a preset reference signal and senses the sensing signals applied by the light pen 100. The analog signal generated by the light is separated and converted into a digital signal, and then output to the drive control unit 410.

The driving control unit 410 outputs a digital control signal applied from the sensing signal processing unit 300 to the information processing unit 500.

The information processing unit 500 processes the control signal applied from the drive control unit 410 and outputs a new video signal to the drive control unit 410 so that an image requested by an operator is displayed on the liquid crystal display panel 200. do.

As described in detail above, the light generated by the light pen blinks at least two or more frequencies so as to be distinguished from the frequency of the external light, and the liquid crystal display panel distinguishes and processes the light and the external light generated by the light pen. The light has an effect of preventing the display of an unintended image.

In the detailed description of the present invention described above with reference to a preferred embodiment of the present invention, those skilled in the art or those skilled in the art having ordinary knowledge in the scope of the invention described in the claims to be described later It will be understood that various modifications and variations can be made in the present invention without departing from the scope of the present invention.

Claims (10)

A body having a pen shape and having an opening for emitting light to an end thereof; A circuit disposed inside the body, the circuit converting a DC power source into a pulse waveform to generate a first pulse having a first frequency for a first time and a second pulse having a second frequency for a second time A driving pulse generation module to make; And And a light generating module disposed inside the body to generate sensing light in a first flashing cycle by the first pulse and in a second flashing cycle by the second pulse. The light pen of claim 1, wherein the first frequency and the second frequency are different from each other. The light pen of claim 1, wherein the driving pulse generation module alternately generates the first pulse and the second pulse. The light pen according to claim 1, wherein the light generating module is a light emitting diode or a semiconductor laser beam. In the light pen used in the liquid crystal display device, A body having an opening formed at the first end in a pen shape; And Optical waveguide means connected to the second end to supply the light generated by the liquid crystal display device outside the body through the second end opposite the first end to output the light to the first end; Light pen characterized in that. The light pen according to claim 5, wherein the optical waveguide means is an optical cable including an optical fiber. A body having a pen shape and having an opening for emitting light to an end thereof; A driving pulse generation module disposed inside the body to generate a blinking frequency different from a frequency of external light generated by a commercial power source; And And a light generating module disposed inside the body to generate sensing light distinguished from the external light at the blinking frequency. The light pen according to claim 7, wherein the commercial power source has a frequency of 50 Hz or 60 Hz. A body having a pen shape and having an opening for emitting light at an end thereof, the second pulse being disposed inside the body to generate a first pulse having a first frequency for a first time and having a second frequency for a second time A light pen including a driving pulse generating module for generating a light generating module and a light generating module disposed inside the body to generate sensing light in a first flashing cycle by a first pulse and a second flashing cycle by a second pulse; A liquid crystal display panel including a plurality of pixel regions for displaying an image by controlling a liquid crystal and sensing elements disposed between the pixel regions to sense a scanning position of sensing light; A sensing signal processor including a signal comparing module configured to compare a first sensing signal output by external light applied to the sensing elements and a second sensing signal output by the sensing light; And A photosensitive liquid crystal display including a driving signal generator configured to generate a first driving signal applied to the pixel area for displaying the image and a second driving signal for displaying a new image in response to the second sensing signal; Device. A light pen comprising a body having a pen shape and having an opening for emitting light to an end thereof, the light generating module disposed inside the body to generate sensing light at a blinking frequency different from that of a commercial power source; A liquid crystal display panel including a plurality of pixel regions for displaying an image by controlling a liquid crystal and sensing elements disposed between the pixel regions to sense a scanning position of sensing light; A sensing signal processor including a signal comparing module configured to compare a first sensing signal output by external light applied to the sensing elements and a second sensing signal output by the sensing light; And A photosensitive liquid crystal display including a driving signal generator configured to generate a first driving signal applied to the pixel area for displaying the image and a second driving signal for displaying a new image in response to the second sensing signal; Device.

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