KR20130002581U - Photometric device of liquid crystal display - Google Patents

Abstract

The present invention includes a first lens unit provided inside the bezel surrounding all sides of the liquid crystal display to collect incident light; A reflector reflecting light collected through the first lens unit; A second lens unit which condenses the light reflected by the reflecting unit again; And an illuminance sensor disposed in a direction parallel to the light collected by the first lens unit so as to receive the light collected by the second lens unit.
According to the present invention, it is possible to accurately measure the ambient illuminance by improving the light receiving rate irrespective of the incident angle of the incident light, and the light reflected through the reflecting part is received by the illuminance sensor arranged in a direction parallel to the focused light. Narrow bezel is possible by adjusting the path of incident light, and total reflection occurs by predicting the incident angle of the focused light to the reflective surface using the difference in reflectance between the constituent material of the reflector and air. There is an effect that can adjust the angle of the reflecting surface of the reflector so as to be incident to the light receiving portion of the illuminance sensor to the maximum.

Description

Metering device for liquid crystal display {PHOTOMETRIC DEVICE OF LIQUID CRYSTAL DISPLAY}

The present invention relates to a light metering device of a liquid crystal display device, and more particularly, a light metering device of a liquid crystal display device for optimally controlling the brightness of a backlight based on a metering value after measuring the ambient illuminance of the liquid crystal display device. It is about.

In recent years, liquid crystal displays have been widely used in home TVs, computers, video phones, and the like. Among such liquid crystal display devices, LCDs and the like have backlights because they are not self-luminous. In particular, in the printing industry, medical use, etc., since reproducibility is required, a photodetector is provided on the back of the liquid crystal display device to measure the amount of backlight light and to control the amount of backlight light.

Patent registration No. 10-0775889 has been proposed as a device for measuring the amount of light of the backlight.

Hereinafter, the supporting structure disclosed in Patent Registration No. 10-0775889 as a prior art will be briefly described.

FIG. 1 is a view illustrating a light metering device of a liquid crystal display of Patent Registration No. 10-0775889 (hereinafter, referred to as “Prior Art 1”). As shown in FIG. 1, in the related art 1, a light metering device 2 is disposed in at least one corner of four corners of a liquid crystal display device 1 including a rectangular liquid crystal surface and a bezel surrounding the periphery thereof. It is. The metering device is moved to the front of the liquid crystal display when the metering is performed, and when the metering is finished, the metering device is stored in the bezel 4 by rotating the circle about the corner of the liquid crystal surface and in the direction of the arrow indicated by three.

In addition, the photometer device moving part 23 equipped with the sensor 24 facing the front of the liquid crystal display device is rotatable by a drive circuit of the micromotor 21 about an axis 22 positioned in the bezel 25. It is arrange | positioned, and moves to the broken line position 26 of FIG. 2 at the time of metering, and is accommodated in the position of the solid line 27 except at the time of metering. By this movable method, the light metering device movable part is shielded into the bezel 25 except at the time of metering so that the liquid crystal display part is not disturbed. At the time of light metering, the sensor covers the front surface of the liquid crystal display, thereby allowing light metering.

However, as described above, the light metering device of the liquid crystal display according to the related art 1 is installed on the bezel 4 spaced apart from the front of the liquid crystal 36, and the light metering device moving part 23 rotates about the axis 22. In consideration of the fact that the gap between the photometer device movable part 23 for preventing scratches or damage from the liquid crystal 36 is sufficiently maintained, a narrow bezel is impossible.

In addition, as shown in FIG. 2, the metering apparatus of the liquid crystal display according to the related art 2 has a device for measuring the amount of incident light (an illuminance sensor mounted on a PCB) installed at the rear of the bezel, so as to occupy the space occupied by the illuminance sensor. In addition to increasing the thickness of the bezel, there was a problem that the width of the bezel also increased by the area required for the light sensor to receive light.

Furthermore, as shown in FIG. 3, in the photometering apparatus of the liquid crystal display according to the related art 3, an illuminance sensor mounted on a PCB for a narrow bezel is disposed in parallel with light incident in a viewer direction inside the bezel. However, the incident light is not received by the illuminance sensor except that the incident light is directly received by the illuminance sensor, and is reflected through a reflecting surface disposed in parallel with the illuminance sensor, so that the incident light is not received by the illuminance sensor, so the light reception rate is lowered. Accordingly, it is difficult to accurately measure the illuminance around the liquid crystal display.

KR 10-0775889 B1

An object of the present invention is to solve the problems of the prior art as described above, to provide a light metering device of a liquid crystal display device that can accurately measure the ambient illuminance by improving the light receiving rate irrespective of the incident angle of the incident light.

In addition, another object of the present invention, since the light reflected through the reflecting portion is received by the illumination sensor disposed in a direction parallel to the focused light, a narrow bezel may be possible according to the path adjustment of the incident light It is to provide a light metering device of a liquid crystal display.

In addition, another object of the present invention, by using the difference in the reflectance between the constituent material and the air of the reflector to estimate the total incident light incident on the reflecting surface to cause the total reflection occurs, the light is incident to the light receiving portion of the illuminance sensor maximum It is to provide a light metering device of a liquid crystal display device capable of adjusting the reflecting surface angle of the reflector as possible.

Specifically, in order to achieve the above object, the present invention, the first lens unit is provided in the interior of the bezel (bezel) surrounding all sides of the liquid crystal display to collect incident light; A reflector reflecting light collected through the first lens unit; A second lens unit which condenses the light reflected by the reflecting unit again; And an illuminance sensor disposed in a direction parallel to the light collected by the first lens unit to receive the light collected by the second lens unit.

In addition, the present invention, the lens unit which is provided inside the bezel surrounding all sides of the liquid crystal display portion to collect incident light; A reflection unit for reflecting light collected through the lens unit; And an illuminance sensor disposed in a direction parallel to the light collected by the lens unit to receive the reflected light by the reflecting unit.

In addition, a lens module including the first lens unit, the second lens unit, and the reflecting unit may be connected to one surface, and the other surface may include a package glass in which the illumination sensor is connected to a printed circuit board (PCB) through an electrode. .

In addition, the lens module consisting of the lens unit and the reflecting unit is connected to the PCB, the opposite surface of the PCB comprises a package glass connected to the illumination sensor via an electrode, the lens module is provided to surround the illumination sensor Can be.

In addition, the first and second lens units and the reflecting unit and the range and the reflecting unit may be formed of a polycarbonate-based synthetic resin material.

In addition, the lens module, the alignment key (align key) on the surface of the lens module and the package glass, the surface of the lens module and the PCB for alignment of the position to be attached on the package glass and the PCB It may be provided.

The metering device of the liquid crystal display according to the present invention can improve the light receiving rate regardless of the incident angle of the incident light, thereby accurately metering the ambient illuminance, and the light reflected through the reflector is disposed in a direction parallel to the focused light. Since it is received by the illuminance sensor, a narrow bezel is possible according to the path adjustment of the incident light, and total reflection is estimated by predicting the incident angle of the focused light on the reflecting surface by using the difference in reflectance between the constituent material of the reflector and the air. There is an effect that can be generated, and the angle of the reflecting surface of the reflecting portion can be adjusted so that the light is incident to the light receiving portion of the illuminance sensor to the maximum.

1 is a front view illustrating a light metering device of a conventional liquid crystal display.
2 is a schematic view showing a photometer of a conventional liquid crystal display.
3 is a cross-sectional view illustrating a light metering device of a conventional liquid crystal display.
4 is a schematic diagram illustrating a state in which a light metering device of a liquid crystal display according to the present invention is provided on a bezel of a liquid crystal display.
5 is a cross-sectional view illustrating a light metering device of a liquid crystal display according to a first embodiment of the present invention.
6 is a cross-sectional view illustrating a light metering device of a liquid crystal display according to a second exemplary embodiment of the present invention.

The terms or words used in this specification and claims are meant to conform to the technical spirit of the present invention based on the principle that the inventor can properly define the concept of the term in order to best describe his or her design in the best way. It must be interpreted as and concepts.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise. Also, the term " part "in the specification means a unit for processing at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software.

Hereinafter, a configuration of an embodiment of a light metering device of a liquid crystal display according to the present invention will be described in detail with reference to the accompanying drawings.

4 is a cross-sectional view illustrating a state in which a light metering device of a liquid crystal display according to the present invention is provided in a liquid crystal display. Referring to FIG. 4, the liquid crystal display 100 includes a liquid crystal display 111, a bezel 112 surrounding all sides of the liquid crystal display 111, and a lower right side of the bezel 112. And a metering device 110 of a liquid crystal display device for controlling the luminance of a backlight (not shown) through feedback of metering information after measuring the ambient illuminance of the front surface of the display device 100. do. In this case, the lower right side of the bezel 112 is only one example of a position where the light metering device 110 may be disposed, but the scope of the present invention is not limited thereto. That is, the photometric device 110 of the liquid crystal display may be disposed in a portion of the bezel 112 to avoid the liquid crystal display 111. Here, the bezel may be expressed differently, such as a bracket or front. In addition, a portion of the bezel 112 may be partially translucent or transparent so that incident light may pass through the front portion of the front surface of the bezel 112, that is, the front right side of the bezel 112. It may also be formed of a material. However, when the bezel 112 is formed of an opaque material, it is preferable to appropriately set the thickness of the bezel 112 in consideration of the transmittance of incident light.

≪ Example 1 >

5 is a cross-sectional view of a configuration of a light metering device of a liquid crystal display according to a first embodiment of the present invention.

According to these drawings, the light metering device 110 of the liquid crystal display according to the present exemplary embodiment includes a lens module 114, an illuminance sensing module 116, a central processing unit, and a backlight driving circuit unit.

The lens module 114 includes a first lens unit 114a, a reflector 114b, and a second lens unit 114c in detail.

The first lens unit 114a is provided inside the bezel 112 surrounding all sides of the liquid crystal display 111 to condense incident light toward the reflector 114b.

The reflector 114b has an inclined reflecting surface to reflect the light collected through the first lens unit 114a toward the second lens unit 114c, and is made of polycarbonate (PC) -based synthetic resin material. Or the like.

Here, the reflective surface of the reflector 114b may be formed of any one selected from a reflective coating, a mirror, a reflective tape, and the like so as to improve the reflectance of the focused light. In addition, the medium can be changed to any medium that reflects light.

In addition, the reflector 114b may be provided with a film quality instead of the reflective surface, and when light is refracted from a medium having a large refractive index to a small medium without the reflective surface, if the incident angle is larger than the critical angle, the total reflection is not reflected but totally reflected. To use.

Since the reflecting surface angle of the reflecting part 114b predicts an incident angle to the reflecting surface with respect to the light collected by the first lens part 114a using the difference in reflectance between the constituent material of the reflecting part 114b and air. The total reflection can be adjusted.

The second lens unit 114c collects the light reflected by the reflector 114b and provides it to the illumination sensor 116d of the illumination sensing module 116. Here, the first lens unit 114a and the second lens unit 114c are formed of the same material as the material of the reflector 114b.

In this case, the first lens unit 114a is disposed in a direction orthogonal to the incident light direction, the reflecting unit 114b is disposed to be inclined at an end of the first lens unit 114a, and the second lens unit 114c is disposed above the first lens unit 114a. The first lens unit 114a is disposed in a direction perpendicular to the illuminance sensor 116d of the illuminance sensing module 116. Through this, it can be seen that the second lens unit 114c and the illuminance sensor 116d are disposed in a direction parallel to the light collected by the first lens unit 114a. Meanwhile, the first lens unit 114a and the second lens unit 114c are illustrated in the orthogonal direction. However, the present invention is not limited thereto, and angles may be increased or decreased. In addition, when the first lens unit 114a, the reflector 114b, and the second lens unit 114c are attached to the surface of the package glass 116a, the first lens unit 114a, the reflective unit 114b, and the second lens unit 114c may be realized through separate attachment units. When forming, it may be formed integrally through a mold (mold).

The illuminance sensing module 116 includes a package glass 116a, an electrode 116b, a conductor 116c, and an illuminance sensor 116d in detail.

Package glass (116a) is a lens module 114 is connected to the front through the attachment portion based on Figure 5, the illumination sensor 116d of the illumination sensing module 116 disposed on the back is a PCB (Printed Circuit Board) ) Is connected. That is, the package glass 116a is formed of a transmissive material so that the illumination sensor 116d disposed on the rear surface of the package glass 116a is connected to the PCB through the electrode 116b, and the light focused through the second lens portion 114c can be transmitted. It is preferable to be.

In addition, an alignment key may be provided at the attachment portion of the package glass 116a of the illuminance sensing module 116 and the lens module 114, respectively. In this case, the alignment key may be used to align the lens module 114 to be accurately attached to the package glass 116a. For example, the align key is displayed in the form of "+", so that one of the align keys is a reference point and the other is a moving point.

Here, in the alignment process by the alignment key, first, the camera (not shown in the drawing) photographs the alignment keys respectively provided on the package glass 116a and the attachment portion, and then the interval between the alignment keys in the stored image. And a direction and the like, and align the moving point align key with the reference point align key at a predetermined interval and direction according to the calculation result.

The electrode 116b is connected to a terminal of the illuminance sensor 116d provided on the rear surface of the package glass 116a so that the illuminance sensor 116d may be mounted on the PCB and electrically connected thereto.

The conductor 116c is a component attached to the rear surface of the package glass 116a so as to electrically connect the illumination sensor 116d and the electrode 116b.

The illuminance sensor 116d is disposed and received in a direction parallel to the light collected by the first lens unit 114a to receive the light collected by the second lens unit 114c at a photodiode that is a light receiving unit. It functions to measure the ambient illuminance of the liquid crystal display 111 through the light, and is electrically connected to the backlight driving circuit unit and the central processing unit to control the brightness of the backlight according to the illuminance value.

In particular, the illuminance sensor 116d may provide a brightness control signal of the backlight according to the illuminance value of sensing light with respect to the ambient illuminance of the liquid crystal display 111.

The central processing unit (not shown in the drawing) presets the luminance value of the backlight with respect to the ambient illuminance value of the liquid crystal display 111 detected by the illuminance sensor 116d by passing through the front surface of the bezel 112 through an operator's input or the like. In this state, the corresponding brightness of the backlight is controlled to be adjusted according to the illuminance value input to the illuminance sensor 116d. For example, the central processing unit may control the previous illumination value and the latest illumination value to be compared with each other through a feedback while receiving a signal for the ambient illumination value of the liquid crystal display 111 every set time (seconds, minutes). Do.

The backlight driving circuit unit (not shown) receives a control signal output from the central processing unit and controls whether the backlight is driven and brightness.

Therefore, the photometric device 110 of the liquid crystal display according to the present embodiment passes the entire surface of the bezel 112 and detects the ambient illuminance value of the liquid crystal display 111 detected by the illuminance sensor 116d at the central processing unit. After comparison, a control signal is output to the backlight driving circuit unit by the corresponding difference, and the brightness control of the backlight is controlled by the backlight driving circuit unit. In this case, in the light metering device 110 of the liquid crystal display, incident light is collected by the first lens unit 114a, the collected light is reflected by the reflector 114b, and the reflected light is reflected by the second lens unit ( In the process of condensing again by 114c), it is possible to accurately measure the ambient illuminance by improving the light receiving rate regardless of the incident angle of the incident light. In addition, the illumination sensor 116d is disposed in a direction parallel to the light condensed by the first lens unit 114a, thereby enabling a narrow bezel.

≪ Example 2 >

6 is a cross-sectional view of a configuration of a light metering device of a liquid crystal display according to a second exemplary embodiment of the present invention.

According to these drawings, the light metering device 120 of the liquid crystal display according to the present exemplary embodiment includes a lens module 124, an illuminance sensing module 126, a central processing unit, and a backlight driving circuit unit.

The lens module 124 includes a lens unit 124a and a reflector 124b in detail.

The lens unit 124a is provided inside the bezel 112 surrounding all sides of the liquid crystal display 111 to condense incident light toward the reflecting unit 124b.

The reflector 124b is formed with an inclined reflective surface to reflect the light collected through the lens unit 124a in the direction of the illuminance sensor 126d of the illuminance sensing module 126, and is made of polycarbonate (PC). It may be formed through a series synthetic resin material.

Here, the reflective surface of the reflector 124b may be formed of any one selected from a reflective coating, a mirror, a reflective tape, and the like so as to improve the reflectance of the focused light. In addition, the medium can be changed to any medium that reflects light.

In addition, the reflector 124b may be provided with a film quality instead of the reflective surface as in the previous embodiment, and a detailed description thereof will be omitted.

The reflection surface angle of the reflection unit 124b is total reflection as the angle of incidence of the reflection surface is predicted with respect to the light collected by the lens unit 124a using the difference in reflectance between the constituent material of the reflection unit 124b and the air. To make it possible. Here, the lens unit 124a is formed of the same material as the material of the reflector 124b.

In this case, the lens unit 124a is disposed in a direction orthogonal to the incident light direction, and the reflecting unit 124b is disposed to be inclined at the end of the lens unit 124a. It can be seen that the illumination sensor 126d is disposed in parallel with the light collected by the lens unit 124a. Meanwhile, although the lens unit 124a is disposed in the direction orthogonal to the illumination sensing module 126, the lens unit 124a may be increased or decreased in angle. The lens unit 124a and the reflecting unit 124b may be realized through separate attachment parts when attached to the PCB, and may be integrally formed through a mold (mold) when the lens module 124 is formed. .

Here, the lens module 124 is connected to the front surface of the PCB through the attachment portion based on Figure 6, the illumination sensing module 126 is provided in the form surrounding the illumination sensing module 126.

The illuminance sensing module 126 includes a package glass 126a, an electrode 126b, a conductor 126c, and an illuminance sensor 126d in detail, and thus has the same structure and function as that of the first embodiment. do. However, in the present exemplary embodiment, the lens module 124 may be provided to surround the illumination sensing module 126.

Meanwhile, alignment keys may be provided on the surface of the PCB and the attachment portion of the lens module 124, respectively. In this case, the alignment key is different from the above-described embodiment provided on the package glass 116a, and thus only the position of the alignment key is different from the detailed description.

Therefore, the light metering device 120 of the liquid crystal display according to the present embodiment passes the front surface of the bezel 112 and detects the ambient illuminance value of the liquid crystal display 111 detected by the illuminance sensor 126d at the central processing unit. After comparison, a control signal is output to the backlight driving circuit unit by the corresponding difference, and the brightness control of the backlight is controlled by the backlight driving circuit unit. In this case, the photometric device 120 of the liquid crystal display may receive the light receiving rate regardless of the incident angle of the incident light while the incident light is collected by the lens unit 124a and the collected light is reflected by the reflecting unit 124b. It can improve the metering of the ambient illuminance accurately. In addition, the illumination sensor 126d is disposed in a direction parallel to the light condensed by the lens unit 124a, thereby enabling a narrow bezel.

Although the present invention has been described with reference to the limited embodiments and drawings, the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the utility model claims described below and equivalents to the utility model claims.

110, 120: Light metering device of the first and second liquid crystal display
114, 124: lens module
114a and 114c: first and second lens units
114b, 124b: reflective film
116, 126: illuminance sensing module
116a: packaged glass
116b: electrode
116d: Ambient Light Sensor
124a: lens unit

Claims (6)

A first lens unit provided inside the bezel surrounding all sides of the liquid crystal display to collect incident light;
A reflector reflecting light collected through the first lens unit;
A second lens unit which condenses the light reflected by the reflecting unit again; And
And an illuminance sensor disposed in a direction parallel to the light collected by the first lens unit to receive the light collected by the second lens unit.
A lens unit provided inside the bezel surrounding the liquid crystal display unit to condense incident light;
A reflection unit for reflecting light collected through the lens unit; And
And an illuminance sensor disposed in a direction parallel to the light collected by the lens unit to receive the reflected light by the reflecting unit.
The method of claim 1,
A lens module comprising the first lens unit, the second lens unit, and the reflecting unit is connected to one surface, and the other surface of the liquid crystal display including a package glass connected to the PCB (Printed Circuit Board) through an electrode. Metering device.
The method of claim 2,
A lens module including the lens unit and the reflecting unit is connected to a PCB, and a package glass having an illumination sensor connected to an opposite surface of the PCB through an electrode, and the lens module is provided to surround the illumination sensor Metering of the display device.
The method according to claim 3 or 4,
The first and second lens units and the reflector, and the lens unit and the reflector are formed of a polycarbonate-based synthetic resin material meter of the liquid crystal display device.
The method according to claim 3 or 4,
The lens module is provided with an alignment key on the surface of the lens module and the package glass and the surface of the lens module and the PCB to align the package glass and the position to be attached on the PCB. Metering device of liquid crystal display.

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