KR101579980B1 - Display device and driving method thereof - Google Patents

Abstract

The present invention relates to a display device and a driving method thereof.

That is, the display device of the present invention includes: a backlight unit sequentially emitting red light, green light, and blue light; A plurality of openings through which light emitted from the backlight unit passes are formed and shutters for opening and closing the plurality of openings are formed.

Display device, backlight, light transmission, adjustment, aperture, shutter, MEMS

Description

[0001] The present invention relates to a display device and a driving method thereof,

The present invention relates to a display device capable of reducing the thickness of a display device and a driving method thereof.

A liquid crystal display system for displaying electronic information is composed of a chassis, a light source, an optical sheet, a liquid crystal panel, and a driving circuit.

Particularly, the portion constituted by the chassis, the light source, and the optical sheet portion corresponding to the backlight unit (BLU) is an indispensable device due to the non-emission characteristic of the liquid crystal itself.

In recent years, due to the development of light emitting diode (LED) technology and the advantage of environmentally friendly and low energy, it has been widely adopted in BLU, and is expanding its fields in mobile phones, notebooks, monitors, TVs and lighting.

The light emitting diode has features that enable downsizing and thinning by applying its micro-semiconductor process, contributing to the development toward a thinner and lighter display than conventional CCFL (cold cathode fluorescent lamp).

The present invention solves the problem that the thickness of the display device can be reduced.

Preferred embodiments of the present invention are,

A backlight unit for emitting light;

There is provided a display device comprising a plurality of openings through which light emitted from the backlight unit passes, and a light transmission control unit having shutters capable of opening and closing the plurality of openings.

According to another preferred embodiment of the present invention,

A backlight unit sequentially emitting red light, green light, and blue light, and a plurality of apertures through which light emitted from the backlight unit passes are formed, and a plurality of apertures Preparing a display device composed of an adjustment part;

Sequentially emitting red light, green light and blue light in the backlight unit;

And controlling the operation of the shutters of the light transmission control unit to open and close the plurality of openings to display a color image screen using the light emitted from the backlight unit.

The display device of the present invention sequentially emits red light, green light and blue light in the backlight unit and controls the operation of the shutters of the light transmission control unit to realize colors of light emitted through each of the plurality of apertures in the same manner as the image, There is an effect that a color image screen can be displayed by the light emitted from the transmission control unit.

Also, since the display device of the present invention realizes the shutters with the MEMS structure and the sizes of the plurality of openings are made small in units of micros, the number of pixels per unit area can be innovatively increased to realize a high-resolution display device have.

In the display device of the present invention, brightness data of each of a plurality of divided backlight unit blocks is extracted in accordance with a video signal from a driving unit, and the red light emitting elements arranged in each of the plurality of divided backlight unit blocks And controlling the driving of the green light emitting elements and the blue light emitting elements, the brightness of each of the plurality of divided backlight unit blocks is changed according to the luminance of the image, thereby reducing power consumed in the light emitting element.

Further, the display device of the present invention has an effect of displaying a high-resolution color image screen without applying a liquid crystal panel.

In addition, the display device of the present invention does not use a liquid crystal panel, thereby reducing the thickness of the display device.

In addition, the display device of the present invention is capable of driving at 240 Hz, and thus has the effect of securing a response speed capable of fast moving picture reproduction.

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

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. Rather, the intention is not to limit the invention to the particular forms disclosed, but rather, the invention includes all modifications, equivalents and substitutions that are consistent with the spirit of the invention as defined by the claims.

As used herein, the term " and / or " includes any and all combinations and all combinations of related items noted.

Although the terms first, second, etc. may be used to describe various elements, regions, and / or regions, it should be understood that such elements, regions, and / I will understand.

FIG. 1 is a schematic view for schematically explaining a display device according to the present invention, which includes a backlight unit 100 that emits light; A light transmission control unit 200 having a plurality of openings through which light emitted from the backlight unit 100 passes and having shutters for opening and closing the plurality of openings, .

Here, the backlight unit 100 is preferably a backlight unit that sequentially emits red light, green light, and blue light.

 Therefore, the display apparatus according to the present invention sequentially emits red light, green light, and blue light in the backlight unit 100, and controls the operation of the shutters 220 of the light transmission control unit 200, The colors of light emitted through each of the light transmitting and receiving units 230 are implemented in the same manner as the image, so that a color image screen can be displayed with the light emitted from the light transmission controlling unit 200.

Therefore, the display device of the present invention has an advantage that a high-resolution color image screen can be displayed without applying a liquid crystal panel.

As a result, the display device of the present invention does not use a liquid crystal panel, which is advantageous in that the thickness of the display device can be reduced.

In addition, each of the plurality of openings 230 of the light transmission control unit 200 may be a single pixel of a color image screen.

Here, the pixel may be defined as a pixel for displaying an image.

The shutters of the light transmission control unit 200 may be implemented as a MEMS (Micro Electronic Mechanical System) structure.

When the shutters are formed by the MEMS structure, the size of the plurality of openings 230 is also reduced in units of micros, and the number of pixels per unit area can be innovatively increased to realize a high- There is an advantage.

2A and 2B are diagrams for explaining a driving method of a display device according to the present invention. A plurality of apertures 230 are formed in the light transmission control unit 200, and the shutter of the light transmission control unit 200 The light emitted from the backlight unit 100 is reflected by the plurality of apertures 230 as shown in Figure 2A when the plurality of apertures 230 are operated to close (i.e., close) The light is not emitted to the upper part of the light transmission control part 200 because the light does not pass through the light transmission part 230.

2B, when the shutters 220 of the light transmission control unit 200 are operated to open the plurality of openings 230, the backlight unit 100 is opened, The light emitted from the light guide 230 passes through the plurality of openings 230 and is emitted to the upper portion of the light transmission control unit 200.

At this time, the display device of the present invention displays a color screen by controlling the number of times of opening and closing each of the plurality of openings 230.

More specifically, when the red light, the green light, and the blue light are sequentially emitted from the backlight unit 100, the operation of the shutters 220 of the light transmission control unit 200 is controlled, The colors of the light emitted through the respective light sources are implemented in the same manner as the image, so that a color image screen can be displayed by the light emitted from the light transmission control unit 200.

For example, when light emitted through a certain aperture is magenta on a still image of a color image screen, when the green light is emitted from the backlight unit 100, the specific aperture is closed, and the backlight unit 100, when the red light and the blue light are emitted, when the specific opening is opened, the red light and the blue light are mixed to become magenta light, so that magenta color can be realized.

In this way, the color of the light emitted from each of the plurality of openings 230 of the light transmission control unit 200 can be realized, so that a color image screen is acquired with the light emitted from the light transmission control unit 200 .

In addition, when controlling the number of times of opening / closing each of the plurality of openings for a predetermined time, the light emitted from each of the plurality of openings is formed by being opened and closed for an extremely short time, So that a natural color image can be seen by the light emitted from the light transmission control unit 200.

Here, it is preferable that the number of opening / closing of each of the plurality of openings is plural times in one second.

The number of opening and closing of each of the plurality of openings is most preferably 0 to 240 per second.

As a result, the display device of the present invention is capable of driving at 240 Hz, which is advantageous in securing a response speed for fast video reproduction.

Fig. 3 is a schematic perspective view showing an example of a display device according to the present invention. The shutter of the light transmission control portion of the display device according to the present invention can be implemented as a MEMS structure, as described above.

An example of the MEMS structure is a micro rotary disc using MEMS technology.

As shown in FIG. 3, the micro-rotary plate 222 is made of MEMS technology on the substrate 221.

That is, the shutters of the light transmission control unit 220 can be implemented by a plurality of micro rotary plates 222 formed on the substrate 221.

A guide part 210 having a plurality of openings 230 is positioned on the substrate 221.

3, the guide portion 210 and the substrate 221 on which the plurality of micro rotary plates 222 are formed are separated from each other. However, the guide portion 210 and the substrate 221 are appropriately brought close to each other do.

Here, the plurality of micro rotary plates 222 are shutters.

Accordingly, the light transmission control unit of the display device according to the present invention includes a substrate 221; A plurality of micro rotary plates 222 formed on the substrate 221; And a guide unit 210 disposed on the substrate 221 and having a plurality of openings 230 corresponding to the plurality of micro rotary plates 222.

3 is a schematic partial cross-sectional view of the display device of FIG. 3. In the case where the shutter of the light transmission control unit is implemented by the micro rotary plate 222 which is a MEMS structure, the micro rotary plate 222 is inserted into the opening 230 of the guide portion 210 ).

Therefore, when the micro rotary plate 222 is operated and rotated, the light transmitted from the backlight unit passes through the opening 230 of the guide unit 210.

5A and 5B are views for explaining the opening and closing of the opening in a partial sectional view of FIG. 4. First, as shown in FIG. 5A, if the micro rotary plate 222 is not operated, the micro rotary plate 222 is not rotated, The micro rotary plate 222 closes the opening 230 of the guide unit 210 so that the light transmitted from the backlight unit can not pass through the opening 230 of the guide unit 210.

Therefore, the opening 230 is in the closing state.

5B, when the micro rotary plate 222 is operated, the micro rotary plate 222 is rotated to open the opening 230 of the guide unit 210 so that light transmitted from the backlight unit And passes through the opening 230 of the guide portion 210.

At this time, the opening 230 is in an opening state.

The gap between the micro rotary plate 222 and the opening 230 (arrow in FIG. 5A) can be finely adjusted to a machining tolerance level, so that the interval between the micro rotary plate 222 and the opening 230 The amount of light transmitted from the backlight unit exiting from the backlight unit can be reduced.

6 is a partial plan view for explaining operation of the micro rotary plate applied in accordance with the present invention. In order to implement the above-described micro rotary plate, a through hole 223 is formed in the substrate 221, and the through hole 223 It is preferable that the micro rotary table 222 is positioned and the micro rotary table 222 is connected to the substrate 221 by connecting portions 224. [

At this time, the micro rotary plate 222 is able to rotate the micro rotary plate 222 about the connection portions 224 serving as a torsion beam formed on both sides.

The driving force for rotating the micro rotary plate 222 may be one of an electrostatic force, an electromagnetic force, a thermal driving force, and a piezoelectric force.

7A and 7B are partial plan views for explaining the opening and closing of the opening by the operation of the micro rotary plate applied in accordance with the present invention. In the state where the micro rotary plate 222 is not operated, the opening 230 of the guide portion 210, As shown in FIG. 7A, the micro rotary plate 222 is in a closed state, and light transmitted from the backlight unit can not pass through the opening 230 of the guide unit 210.

When the micro rotary plate 222 rotates, the opening 230 of the guide unit 210 is opened and light transmitted from the backlight unit passes through the opening 230 of the guide unit 210 .

8 is a configuration block diagram for controlling a light transmission control unit applied in accordance with the present invention.

The light transmission control unit may further include a light transmission control signal extraction unit for extracting a signal capable of controlling the opening and closing of each of the plurality of shutters from the image signal.

8, the video signal is input to the light transmission control signal extraction unit 250. The light transmission control signal extraction unit 250 includes a plurality of shutters 225-1, 225-2, 225-3, and 225- n) that can control the opening and closing of each of them.

A signal for controlling the opening and closing extracted by the light transmission control signal extracting unit 250 is input to each of the plurality of shutters 225-1, 225-2, 225-3, and 225-n.

Therefore, the number of opening / closing times of the plurality of shutters 225-1, 225-2, 225-3, and 225-n varies depending on the image signal.

13, assuming that the first to fifth openings 231a, 231b, 232c, 232d and 232e exist in the light transmission control unit, the first through fifth openings 231a and 231b 232c, 232d, and 232e is determined by the color of light emitted from each of the first through fifth openings 231a, 231b, 232c, 232d, and 232e according to the color image screen of the image signal. do.

As a result, the present invention controls the number of times that the shutters open and close the openings so that the light passed through the apertures of the light transmission control unit becomes a color image screen.

FIG. 9 is a block diagram for controlling a backlight unit applied in accordance with the present invention. As described above, the backlight unit is configured to sequentially emit red light, green light, and blue light.

In order to sequentially emit red light, green light, and blue light in the backlight unit, the driving of the red light emitting devices 120, the green light emitting devices 130, and the blue light emitting devices 140 arranged in the backlight unit is controlled .

Therefore, as shown in FIG. 9, the red light emitting devices 120, the green light emitting devices 130, and the blue light emitting devices 140 arranged in the backlight unit are sequentially turned on to emit control signals The driving unit 110 is provided.

10 is a view for explaining a backlight unit applied in accordance with the present invention in which red light emitting elements, green light emitting elements and blue light emitting elements are arranged in a backlight unit.

Here, the red light emitting elements, the green light emitting elements, and the blue light emitting elements may be uniformly distributed in the backlight unit.

The arrangement of the red light emitting elements, the green light emitting elements, and the blue light emitting elements may be a combination of red light emitted from the red light emitting elements, green light emitted from the green light emitting elements and blue light emitted from the blue light emitting elements, So that the blue light is uniformly emitted.

10, the backlight unit may be divided into a plurality of blocks 101, and the red light emitting devices, the green light emitting devices, and the blue light emitting devices may be uniformly arranged in each of the plurality of blocks 101 It is arranged.

Here, each of the plurality of blocks 101 may be a unit pixel including a red light emitting element, a green light emitting element, and a blue light emitting element.

In the case where the backlight unit is divided into the plurality of blocks 101 and the red light emitting elements, green light emitting elements and blue light emitting elements are uniformly arranged in each of the plurality of blocks 101, The green light emitted from the green light emitting elements and the blue light emitted from the blue light emitting elements can be uniformly emitted to the entire area of the backlight unit.

In addition, according to the present invention, luminance data of each of the plurality of divided backlight unit blocks is extracted in accordance with a video signal by the driving unit 110 of FIG. 9, and the luminance data of the plurality of divided backlight unit blocks is arranged By controlling the driving of the red light emitting devices 120, the green light emitting devices 130 and the blue light emitting devices 140, the brightness of each of the plurality of divided backlight unit blocks is changed according to the luminance of the image, There is an advantage that the power consumed by the device can be reduced.

11A and 11B are diagrams for explaining a light emitting device mounted on a backlight unit applied in accordance with the present invention. The backlight unit includes a red light emitting device R, a green light emitting device G and a blue light emitting device B And can be arranged in units of pixels (Fixel).

That is, unit pixels made up of the red light emitting element R, the green light emitting element G, and the blue light emitting element B are arranged in a matrix of a row and a column.

11A, a unit pixel may be realized by arranging the red light emitting device R, the green light emitting device G, and the blue light emitting device B in a line.

A unit pixel as shown in FIG. 11B can be implemented by arranging the red light emitting element R, the green light emitting element G, the green light emitting element G, and the blue light emitting element B, respectively.

It can be arranged in a manner other than the arrangement of FIGS. 11A and 11B.

12 is a schematic plan view for explaining light emission in each pixel of the display device according to the present invention. Pixels of the display device can be formed by a plurality of openings 230 of the light transmission control part 200 have.

As described above, light passing through the openings 230 of the light transmission control unit 200 becomes a color image screen.

Therefore, the number of times that the openings 230 are opened or closed depends on the color of the color image screen formed by the image signal, since the shutters are controlled by the image signal to open and close the openings 230.

That is, as shown in FIG. 12, the number of times of opening and closing the 'A' opening, the 'B' opening and the 'C' opening is different.

FIG. 14 is a plan view showing a state in which light emitting elements are arranged in a backlight unit of a display device according to the present invention, wherein the backlight unit includes a red light emitting element, a green light emitting element, and a blue light emitting element, The devices are arranged.

The unit pixels made up of such light emitting elements are arranged in a matrix of a row and a column in a backlight unit.

In this case, the unit pixel may be a unit pixel 151 in which a red light emitting element, a green light emitting element, and a blue light emitting element are arranged in a row, or a unit pixel 151 arranged in a red light emitting element, a green light emitting element, ).

FIG. 15 is a schematic flow chart for explaining a method of driving a display device according to the present invention. First, a backlight unit sequentially emitting red light, green light, and blue light; A plurality of openings through which the light emitted from the backlight unit passes are formed and a light transmission control unit having shutters capable of opening and closing each of the plurality of openings is prepared . In step S100,

Then, the backlight unit sequentially emits red light, green light, and blue light (step S200)

Then, the operation of the shutters of the light transmission control unit is controlled to open / close a plurality of openings to display a color image screen with the light emitted from the backlight unit (step S300)

Here, it is preferable that the shutters of the light transmission control unit are controlled such that the number of times that each of the plurality of openings is opened and closed is controlled according to an image signal.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

1 is a schematic cross-sectional view of a backlight unit according to a first embodiment of the present invention

Fig. 2 is an enlarged view of Fig. 1

3 is a schematic plan view of a backlight unit according to the first embodiment of the present invention.

4A and 4B are schematic cross-sectional views for explaining a method of manufacturing a backlight unit according to the first embodiment of the present invention

5 is a schematic cross-sectional view for explaining a state in which a phosphor is formed on a backlight unit according to the present invention

6 is a schematic sectional view for explaining a state in which a transparent substrate is formed in a backlight unit according to the present invention

7 is a schematic cross-sectional view of a backlight unit according to a second embodiment of the present invention

8 is a schematic plan view of a backlight unit according to a second embodiment of the present invention.

9A and 9B are schematic cross-sectional views illustrating a method of manufacturing a backlight unit according to a second embodiment of the present invention

10 is an enlarged view of B in Fig. 9

11 is a partial cross-sectional view showing a state where a phosphor is formed in a backlight unit according to a second embodiment of the present invention

12A and 12B are schematic cross-sectional views for explaining an example of a light emitting diode package applied to a backlight unit according to the present invention

13 is a schematic cross-sectional view for explaining the number of times of opening and closing of the openings in the light transmission control unit applied according to the present invention

14 is a plan view showing a state in which light emitting elements are arranged in a backlight unit of a display device according to the present invention

15 is a schematic flow chart for explaining a driving method of a display device according to the present invention.

Claims (20)

A backlight unit for emitting light; And And a light transmission control unit including a plurality of openings through which light emitted from the backlight unit passes, and a shutter that opens and closes each of the plurality of openings by rotation, The opening is formed in a circular shape, Wherein the shutter is formed in a shape different from the circular opening, The shutter includes a substrate, a through hole formed in the substrate and at least a part of which overlaps with the opening, a rotating plate positioned to be spaced apart from the substrate in the through hole, And a connection part And the rotating plate rotates about the connecting portion to open / close the opening. The method according to claim 1, Wherein each of the plurality of apertures of the light transmission control unit includes: Wherein the display device is a single pixel of a color image screen. The method according to claim 1, The backlight unit includes: And sequentially emits red light, green light, and blue light. The method according to claim 1, Wherein the shutter is a MEMS (Micro Electronic Mechanical System) structure. The method according to claim 1, Wherein the rotary plate is a micro rotary plate. delete The method of claim 5, The micro rotary table comprises: A display device driven by one of an electrostatic force, an electromagnetic force, a thermal driving force, and a piezoelectric force. The method according to claim 1, The light- And a light transmission control signal extracting section for extracting a signal capable of controlling the opening and closing of each of the plurality of shutters from the video signal. The method of claim 3, In the backlight unit, Wherein the red light emitting element, the green light emitting element, and the blue light emitting element are arranged. The method of claim 9, In the backlight unit, And a driver for outputting a control signal so that the red light emitting element, the green light emitting element, and the blue light emitting element sequentially turn on. The method of claim 9, The red light emitting element, the green light emitting element, And is arranged to be uniformly distributed in the backlight unit. The method of claim 10, The backlight unit includes: Wherein the red light emitting element, the green light emitting element, and the blue light emitting element are uniformly arranged in each of the plurality of blocks. The method of claim 10, The backlight unit includes: And is divided into a plurality of blocks, Wherein each of the plurality of blocks comprises: Wherein the display device is a unit pixel (Fixel) arranged with a red light emitting element, a green light emitting element and a blue light emitting element. 14. The method of claim 13, The unit pixel includes: A unit pixel in which the red light emitting element, the green light emitting element, and the blue light emitting element are arranged in a line, or Wherein the red, green, and blue light emitting elements are unit pixels arranged in the red light emitting element, the green light emitting element, the green light emitting element, and the blue light emitting element. A backlight unit for sequentially emitting red light, green light, and blue light, and a plurality of openings through which light emitted from the backlight unit passes are formed, and a shutter for opening and closing each of the plurality of openings by rotation is formed. Preparing a display device including the display device; Sequentially emitting red light, green light, and blue light in the backlight unit; And controlling the operation of the shutter of the light transmission control unit to open and close each of the plurality of openings to display a color image screen with the light emitted from the backlight unit, The opening is formed in a circular shape, Wherein the shutter is formed in a shape different from the circular opening, The shutter includes a substrate, a through hole formed in the substrate and at least a part of which overlaps with the opening, a rotating plate positioned to be spaced apart from the substrate in the through hole, And a connection part And the rotating plate rotates about the connecting portion to open / close the opening. 16. The method of claim 15, The displaying of the color image screen may include: Wherein the shutter of the light transmission control unit is controlled so that the number of times that each of the plurality of openings is opened or closed is controlled in accordance with a video signal. delete 16. The method of claim 15, Wherein the number of times of opening and closing each of the plurality of openings is 1 to 240 times per second. 16. The method of claim 15, Wherein the shutter is a MEMS structure. 16. The method of claim 15, Wherein each of the plurality of apertures of the light transmission control unit includes: A method of driving a display device having a single pixel of a color image screen.

Images