Patent Grant
9666126
This application claims priority to and the benefit under 35 U.S.C. §119(a) of Korean Patent Application No. 10-2014-0103629, filed on Aug. 11, 2014, the entire disclosure of which is incorporated by reference for all purposes.
Field
The following disclosure relates to a display apparatus and a displaying method, more particularly, to an organic light-emitting display apparatus and a displaying method performed by the organic light-emitting display apparatus.
Discussion of the Background
Various types of flat panel display devices capable of having reduced weights and sizes are being developed to address drawbacks of cathode ray tubes. Examples of the flat panel display devices include liquid crystal displays (LCDs), field emission displays (FEDs), plasma display devices (PDPs), and organic light-emitting displays.
LCDs and organic light-emitting displays among them are being widely used in small-sized electronic products, such as mobile phones, tablets, and laptop computers. Such small-sized electronic products use batteries, and accordingly, consumers' demand for increased working time based on a single battery charge is continuously increasing. To increase workable time of a battery, flat panel display devices, which consume a large amount of power in small-sized electronic products, need to reduce its power consumption. Flat panel display devices display images by converting digital image data into a grayscale voltage, which is analog data, and applying the grayscale voltage to pixels.
Exemplary embodiments of the present invention include a display apparatus capable of reducing power consumption, and a displaying method performed by the display apparatus.
Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented embodiments.
According to exemplary embodiments of the present invention, a display apparatus includes a power generation unit, a control unit, a source driver, and a display panel. The control unit configured to receive image data, determine a reference grayscale value of the image data, and convert the image data to corrected data according to the reference grayscale value. The power generation unit configured to generate a first pixel driving voltage, a second pixel driving voltage corresponding to the reference grayscale value, and an analog driving voltage corresponding to the reference grayscale value. The source driver generates grayscale voltages using the analog driving voltage and output, as an image signal, a grayscale voltage corresponding to the corrected data from among the grayscale voltages. The display panel configured to receive the image signal and display an image corresponding to the image signal using the first pixel driving voltage and the second pixel driving voltage.
According to exemplary embodiments of the present invention a displaying method includes receiving image data; determining a reference grayscale value of the image data; converting the image data to corrected data based on the reference grayscale value; and generating a first pixel driving voltage, a second pixel driving voltage corresponding to the reference grayscale value, and an analog driving voltage corresponding to the reference grayscale value; generating grayscale voltages based on the analog driving voltage and outputting, as an image signal, a grayscale voltage corresponding to the corrected data from among the grayscale voltages; and displaying an image corresponding to the image signal using the first pixel driving voltage and the second pixel driving voltage.
According to exemplary embodiments of the present invention, a display apparatus includes a grayscale value extraction unit, a power generation unit, a grayscale voltage generation unit, an image signal output unit, and a display panel. The grayscale value extraction unit configured to receive image data and extract a maximum grayscale value of the image data. The power generation unit configured to generate a first pixel driving voltage, a second pixel driving voltage corresponding to the maximum grayscale value, and an analog driving voltage corresponding to the maximum grayscale value. The grayscale voltage generation unit configured to generate grayscale voltages corresponding to the maximum grayscale value by using the analog driving voltage. The image signal output unit configured to output, as an image signal, a grayscale voltage corresponding to the image data from among the grayscale voltages. The display panel configured to display an image corresponding to the image signal by using the first pixel driving voltage and the second pixel driving voltage.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. Other features and aspects will be apparent from the following detailed description, the drawings, and the claims.
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention, and together with the description serve to explain the principles of the invention.
The invention is described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. Rather, these exemplary embodiments are provided so that this disclosure is thorough, and will fully convey the scope of the invention to those skilled in the art. It will be understood that for the purposes of this disclosure, “at least one of X, Y, and Z” can be construed as X only, Y only, Z only, or any combination of two or more items X, Y, and Z (e.g., XYZ, XZ, XYY, YZ, ZZ). Throughout the drawings and the detailed description, unless otherwise described, the same drawing reference numerals are understood to refer to the same elements, features, and structures. The relative size and depiction of these elements may be exaggerated for clarity.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, the use of the terms a, an, etc. does not denote a limitation of quantity, but rather denotes the presence of at least one of the referenced item. Although some features may be described with respect to individual exemplary embodiments, aspects need not be limited thereto such that features from one or more exemplary embodiments may be combinable with other features from one or more exemplary embodiments.
It will be understood that although the terms “first”, “second”, etc. may be used herein to describe various components, these components should not be limited by these terms. These components are only used to distinguish one component from another. An expression used in the singular encompasses the expression in the plural, unless it has a clearly different meaning in the context. It will be further understood that the terms “comprises” and/or “comprising,” or “includes” and/or “including” used herein specify the presence of stated features or components, but do not preclude the presence or addition of one or more other features or components.
Examples of flat panel display devices include, without limitation, liquid crystal displays (LCDs), field emission displays (FEDs), plasma display devices (PDPs), and organic light-emitting displays. Although exemplary embodiments will be described with respect to organic light-emitting displays, aspects of the invention are not limited thereto.
As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. Expressions such as “at least one of” when preceding a list of elements, modify the entire list of elements and do not modify the individual elements of the list.
Referring to
The power generation unit 150 may generate a first pixel driving voltage ELVDD, a second pixel driving voltage ELVSS having a lower voltage level than the first pixel driving voltage ELVDD, and an analog driving voltage AVDD. The power generation unit 150 may provide or transmit the first pixel driving voltage ELVDD and the second pixel driving voltage ELVSS to the display panel 110 and the analog driving voltage AVDD to the source driver 130.
The control unit 140 is electrically connected to the gate driver 120, the source driver 130, and the power generation unit 150. The control unit 140 may receive image data RGB Data, extract a maximum grayscale value of the image data RGB Data, convert the image data RGB Data to corrected data CData according to the maximum grayscale value, and control the power generation unit 150 to generate the second pixel driving voltage ELVSS to have a first level corresponding to the maximum grayscale value and the analog driving voltage AVDD to have a second level corresponding to the maximum grayscale value. The control unit 140 may include a storage unit 141, which may store the image data RGB Data that is received by the control unit 140. The storage unit 141 may store the image data RGB Data in units of frames. Although the storage unit 141 is included in the control unit 140 in
The source driver 130 may be electrically connected to the power generation unit 150 and the control unit 140. The source driver 130 may receive the analog driving voltage AVDD having the second level generated by the power generation unit 150 and the corrected data CData generated by the control unit 140. The source driver 130 may generate grayscale voltages by using the analog driving voltage AVDD having the second level. Further, the source driver 130 may output, as an image signal, a grayscale voltage corresponding to the corrected data CData from among the grayscale voltages to the display panel 110.
The gate driver 120 may be electrically connected to the control unit 140. The gate driver 120 may generate a gate pulse signal, which may also be referred to as a scan signal, under the control of the control unit 140 and output the gate pulse signal to the display panel 110.
The display panel 110 includes a plurality of pixels 115 to display an image. The display panel 110 may receive an image signal corresponding to the corrected data CData from the source driver 130 and display an image corresponding to the image signal by using the first pixel driving voltage ELVDD and the second pixel driving voltage ELVSS received from the power generation unit 150.
The control unit 140 may analyze the image data RGB Data to determine a reference grayscale value of the image data RGB Data. The reference grayscale value may be the maximum grayscale value of the image data RGB Data. However, the reference grayscale value may be determined to be a value other than the maximum grayscale value of the image data RGB Data. For example, when the maximum grayscale value of the image data RGB corresponds to full white or most white color, the reference grayscale value may be determined to be a grayscale value that is smaller than the maximum grayscale value corresponding to full white.
The control unit 140 may extract a maximum grayscale value for each frame of the image data RGB Data. The storage unit 141 may store image data RGB Data corresponding to one or more frames from among the image data RGB Data received by the control unit 140. The control unit 140 may extract a maximum grayscale value from the image data RGB Data corresponding to the one or more frames stored in the storage unit 141. Through this process, the maximum grayscale value may vary according to image data RGB Data input during different frames.
Further, the control unit 140 may analyze the image data RGB Data to determine whether the image data RGB Data is moving picture data or still image data. When the image data RGB Data is determined to be moving picture data, the control unit 140 may extract a maximum grayscale value for each frame. When the image data RGB Data is determined to be still image data, the control unit 140 may maintain a maximum grayscale value until another image data is inputted.
The control unit 140 may generate a control signal CS corresponding to a maximum grayscale value and provide or transmit the control signal CS to the power generation unit 150. According to an exemplary embodiment, when a maximum grayscale value is extracted for each frame, the control unit 140 may generate a control signal CS for each frame. The control signal CS may be used to control the power generation unit 150 so that the second pixel driving voltage ELVSS has the first level in correspondence to the maximum grayscale value and the analog driving voltage AVDD has the second level in correspondence to the maximum grayscale value.
According to aspects of the invention, the power generation unit 150 may include one or more power generation units. When the power generation unit 150 includes a first power generation unit (not shown) for generating the second pixel driving voltage ELVSS and a second power generation unit (not shown) for generating the analog driving voltage AVDD, the control signal CS may include a first control signal for controlling the first power generation unit and a second control signal for controlling the second power generation unit. The first control signal may be provided or transmitted to the first power generation unit, and the second control signal may be provided or transmitted to the second power generation unit.
The power generation unit 150 may receive the control signal CS and control the level of the second pixel driving voltage ELVSS and the level of the analog driving voltage AVDD according to the control signal CS. The power generation unit 150 may generate the second pixel driving voltage ELVSS having the first level and the analog driving voltage AVDD having the second level according to the control signal CS. According to an exemplary embodiment, the levels of the second pixel driving voltage ELVSS and the analog driving voltage AVDD produced by the power generation unit 150 may vary according to the image data RGB Data.
As the level of the second pixel driving voltage ELVSS and the level of the analog driving voltage AVDD vary, the quality of an image corresponding to the image data RGB Data may be distorted. To prevent or to protect against degradation of the quality of an image, the control unit 140 may convert (or gamma-correct) the image data RGB Data to the corrected data CData to be suitable to the environment in which the second pixel driving voltage ELVSS has the first level and the analog driving voltage AVDD has the second level. The corrected data CData generated by the control unit 140 is provided to the source driver 130, and the source driver 130 in turn provides an image signal corresponding to the corrected data CData to the pixels 115 via data lines under the control of the control unit 140. The pixels 115 may display an image corresponding to the image data RGB Data according to the image signal.
Referring to
The display panel 110 includes a plurality of the pixels 115, and a plurality of data lines DL and a plurality of gate lines GL connected to the pixels 115. The pixels 115 may be disposed at intersections between the data lines DL and the gate lines GL and arranged in a matrix form. The data lines DL are connected to the source driver 130 of
Referring to
The first switch M1 includes a gate connected to a first node N1, a first connection terminal (for example, a source) via which the first pixel driving voltage ELVDD is received, and a second connection terminal (for example, a drain) connected to the anode of the light-emitting device OLED. The second switch M2 includes a gate connected to the gate line GL, a first connection terminal (for example, a source) connected to the data line DL, and a second connection terminal (for example, a drain) connected to the first node N1. The capacitor C is connected between the first node N1 and a line via which the first pixel driving voltage ELVDD is provided.
The second switch M2 may transmit an image signal received via the data line DL to the first node N1. More specifically, the second switch M2 may transmit the image signal in response to a scan signal received via the gate line GL. The capacitor C may store a voltage of the image signal applied to the first node N1. The first switch M1 may generate a driving current (for example, a drain current) according to a level of the voltage of the image signal stored in the capacitor C and provide or transmit the driving current to the light-emitting device OLED. The light-emitting device OLED may emit a light having a brightness corresponding to the image signal based on the driving current.
When the second switch M2 is implemented by using a P-type transistor, the second switch M2 may generate a driving current having a magnitude that is proportional to a difference between the level of the first pixel driving voltage ELVDD and a voltage level of the image signal. More specifically, as the voltage level of the image signal increases, the magnitude of the driving current may decrease, and the brightness level of light emitted by the light-emitting device OLED may be low. As the voltage level of the image signal decreases, the magnitude of the driving current may increase, and the brightness level of light emitted by the light-emitting device OLED may be high.
Referring back to
The source driver 130 may generate the grayscale voltages in order to output image signals corresponding to the grayscale values of the image data RGB Data. The grayscale voltages may be referred to as gamma voltages.
As shown in
If a maximum or reference grayscale value from among the grayscale values of the image data RGB Data is a grayscale value of 241 (e.g., where a maximum grayscale value is 241), the grayscale voltages may have voltage levels ranging from the voltage level gv0 corresponding to the grayscale value of 0 to a voltage level gv241 corresponding to a grayscale value of 241. More specifically, to express or display all of the gray scale values from a grayscale value range of 0 to 241, the grayscale voltages having the levels in a second range G2 may be used.
The grayscale voltages may be generated using the analog driving voltage AVDD generated by the power generation unit 150. For example, the grayscale voltages may be generated by dividing the analog driving voltage AVDD by using resistors (not shown) that may be serially connected to each other. The analog driving voltage AVDD may have a level or value that is equal to or higher than the voltage level or value gv0 corresponding to the grayscale value of 0.
When the maximum grayscale value of the image data RGB Data is the grayscale value of 241, which is lower than the gray scale of 255, only the grayscale voltages having the levels in the second range G2 may be provided, which is narrower than the first range G1, as shown in
A method for performing gamma correction to reduce power consumption without or reduced degradation of the quality of an image by decreasing the level of the analog driving voltage AVDD and increasing the level of the second pixel driving voltage ELVSS when the maximum grayscale value of the image data RGB Data is lower than the grayscale value of 255 will now be described in detail with reference to
When the maximum or reference grayscale value of the image data RGB Data is 255 (e.g., full white), the level of the second pixel driving voltage ELVSS may be referred to as a third level, and the level of the analog driving voltage AVDD may be referred to as a fourth level. The third level of the second pixel driving voltage ELVSS may be lower than a ground voltage level. According to exemplary embodiments, when the level of the second pixel driving voltage ELVSS is increased to be higher than the third level, it approaches the ground voltage level, and thus power consumption may additionally be reduced.
Referring to
When the maximum grayscale value of the image data RGB Data is 241, an image may be displayed with a brightness that is lower than brightness (for example, 425 nit) corresponding to the grayscale value of 241. More specifically, an image may not be displayed with brightness that is higher than the brightness corresponding to the grayscale value of 241. Since there is no need to display the brightness that is higher than the brightness corresponding to the grayscale value of 241 when the maximum grayscale value of the image data RGB Data is 241, the level of the analog driving voltage AVDD may be decreased.
For example, when the maximum grayscale value of the image data RGB Data is 255, the level of the analog driving voltage AVDD (e.g., the fourth level) may be, for example, 7.8 V. When the maximum grayscale value of the image data RGB Data is 241, the level of the analog driving voltage AVDD (e.g., the second level) may be, for example, 7.27 V. The second level of the analog driving voltage AVDD is lower than the fourth level thereof by about 530 mV, and a reduction of power consumption by about 11% may be obtained.
As the maximum grayscale value of the image data RGB Data decreases, the range of brightness used to display an image corresponding to the image data RGB Data may be decreased. Thus, the second level of the analog driving voltage AVDD may decrease.
Referring to
For example, when the maximum grayscale value is 241 and the level of the analog driving voltage AVDD is decreased to the second level in correspondence to the maximum grayscale value of 241, grayscale values in a low grayscale region where the brightness ratio ranges from 0% to about 5.5% may not be expressed, as shown in
Referring to
For example, when the level of the second pixel driving voltage ELVSS is changed to the first level, which is higher than the third level by, for example, 1.5V, to express the low grayscale region (for example, 0 nit to 25 nit) where the brightness ratio is 0% to about 5.5%, the entire brightness may be decreased by 25 nit. Thus, as shown in
As the maximum grayscale value of the image data RGB Data decreases, the second level of the analog driving voltage AVDD may decrease, and the non-expressible low grayscale region may widen. Therefore, when brightness is to be lowered further, the first level of the second pixel driving voltage ELVSS may be increased.
More specifically, in an example, the analog driving voltage AVDD may be decreased to the second level and the second pixel driving voltage ELVSS may be increased to the first level. Referring to
A curve B of
Referring to
Although the maximum grayscale value of the image data RGB Data is 241 described in
The control unit 140 may receive the image data RGB Data. When image data of a first frame is received, the control unit 140 may store the image data of the first frame in the storage unit 141. The control unit 140 may analyze the image data of the first frame stored in the storage unit 141 and extract a maximum grayscale value of the image data of the first frame.
The control unit 140 may determine a level of the second pixel driving voltage ELVSS and a level of the analog driving voltage AVDD that correspond to the maximum grayscale value of the first frame. The control unit 140 may include a memory that stores information about levels of the second pixel driving voltage ELVSS and levels of the analog driving voltage AVDD that correspond to maximum or reference grayscale values of the respective frames or images. When the maximum grayscale value of the first frame is extracted, the control unit 140 may determine the level of the second pixel driving voltage ELVSS and the level of the analog driving voltage AVDD by reading information corresponding to the maximum or reference grayscale value of the first frame from the memory.
The control unit 140 may convert or gamma-correct the image data of the first frame to corrected data of the first frame in correspondence to the maximum grayscale value of the first frame. The control unit 140 may convert the image data of the first frame to the corrected data of the first frame by using an equation including the maximum grayscale value of the first frame. According to exemplary embodiments, the control unit 140 may include a memory that stores mapping tables of pieces of image data and pieces of corrected data that respectively correspond to maximum grayscale values. The control unit 140 may read a mapping table corresponding to the maximum grayscale value of the first frame from the memory and convert the image data of the first frame to the corrected data of the first frame by using the read-out mapping table.
When image data of a second frame is received, the control unit 140 may control the power generation unit 150 by using the control signal CS to generate the second pixel driving voltage ELVSS and the analog driving voltage AVDD, respectively, having levels corresponding to the maximum grayscale value of the second frame. The power generation unit 150 may generate a second pixel driving voltage ELVSS having a first frame level corresponding to the maximum grayscale value of the first frame and an analog driving voltage AVDD having the first frame level corresponding to the maximum grayscale value of the first frame. The power generation unit 150 may output the second pixel driving voltage ELVSS having the first level to the display panel 110 and output the analog driving voltage AVDD having the second level to the source driver 130.
The control unit 140 may output the corrected data of the first frame to the source driver 130. The source driver 130 may receive the analog driving voltage AVDD having the first frame level and generate grayscale voltages by using the analog driving voltage AVDD having the first frame level. The source driver 130 may receive the corrected data of the first frame, select a grayscale voltage corresponding to the corrected data of the first frame from among the generated grayscale voltages, and output the selected grayscale voltage, as an image signal, to the display panel 110.
The display panel 110 may receive the image signal from the source driver 130 and display an image corresponding to the image data of the first frame via the pixels 151. The pixels 151 may display the image by using the second pixel driving voltage ELVSS having the first frame level and the first pixel driving voltage ELVDD having a level higher than the level of the second pixel driving voltage ELVSS, which may be generated by the power generation unit 150.
While the display panel 110 is displaying the image corresponding to the image data of the first frame, the power generation unit 150 may generate the second pixel driving voltage ELVSS having the first level, output the same to the display panel 110, generate the analog driving voltage AVDD having the second level, and output the same to the source driver 130. At this time, the control unit 140 may store the image data of the second frame in the storage unit 141. The control unit 140 may extract a maximum grayscale value of the second frame from the image data of the second frame, determine a level of the second pixel driving voltage ELVSS and a level of the second pixel driving voltage ELVSS in correspondence to the maximum grayscale value of the second frame, and convert the image data of the second frame to corrected data of the second frame.
When the image data of the third frame is received, under the control of the control unit 140, the power generation unit 150 may generate a second pixel driving voltage ELVSS having a second frame level in correspondence to the maximum grayscale value of the second frame and output the second pixel driving voltage ELVSS to the display panel 110, and may generate an analog driving voltage AVDD having a second frame level in correspondence to the maximum grayscale value of the second frame and output the analog driving voltage AVDD to the source driver 130. The source driver 130 may generate grayscale voltages corresponding to the maximum grayscale value of the second frame by using the analog driving voltage AVDD having the second frame level and output, as an image signal, a grayscale voltage corresponding to the corrected data of the second frame from among the grayscale voltages to the display panel 110. The display panel 110 may receive the image signal from the source driver 130 and display an image corresponding to the image data of the second frame via the pixels 151.
While the display panel 110 is displaying the image corresponding to the image data of the second frame, the control unit 140 may receive image data of a third frame and store the image data in the storage unit 141. The display apparatus 100 may control the level of the second pixel driving voltage ELVSS and the level of the second pixel driving voltage ELVSS in correspondence to the maximum grayscale value of each frame while displaying the image corresponding to the image data RGB Data, thereby reducing power consumption.
Referring to
The grayscale voltage generation unit 231 may generate grayscale voltages corresponding to the maximum grayscale value, by using the analog driving voltage AVDD. The image signal output unit 232 may output, as an image signal, a grayscale voltage corresponding to the image data RGB Data from among the grayscale voltages. The display panel 210 may display an image corresponding to the image signal by using the first pixel driving voltage ELVDD and the second pixel driving voltage ELVSS.
The maximum grayscale value extraction unit 242 may be included in the control unit 240. The control unit 240 may include a storage unit 241, which may store the image data RGB Data in units of frames. The storage unit 241 may store the image data RGB Data in units of frames. The control unit 240 may correspond to the control unit 140 of
The grayscale voltage generation unit 231 and/or the image signal output unit 232 may be included in the source driver 230. The grayscale voltage generation unit 231 may be disposed outside the source driver 230 and may provide or transmit the grayscale voltages to the source driver 230. The source driver 230 may correspond to the source driver 130 of
The power generation unit 250, the gate driver 220, and the display panel 210 may correspond to the power generation unit 150, the gate driver 120, and the display panel 110 of
The display apparatus 200 may further include a gamma data storage unit 243, which may respectively store pieces of gamma curve data corresponding to maximum grayscale values. The gamma data storage unit 243 may be included in the control unit 240.
The grayscale voltage generation unit 231 may generate grayscale voltages that are adequate for the environment where the second pixel driving voltage ELVSS has the first level and the analog driving voltage AVDD has the second level. More specifically, the grayscale voltage generation unit 231 may generate the gray scale voltages by using gamma curve data GCD that correspond to the maximum grayscale value of the image data RGB Data. The gamma curve data GCD may be read from the gamma data storage unit 243. According to an exemplary embodiment, when the maximum grayscale value extraction unit 242 extracts the maximum grayscale value of the image data RGB Data, the control unit 240 may read gamma curve data GCD corresponding to the maximum grayscale value from the gamma data storage unit 243, and control the grayscale voltage generation unit 231 to generate, by using the gamma curve data GCD, the grayscale voltages suitable to the environment where the analog driving voltage AVDD has the second level and the second pixel driving voltage ELVSS has the first level.
The image signal output unit 232 may receive the grayscale voltages from the grayscale voltage generation unit 231 and output, as an image signal, a grayscale voltage corresponding to the image data RGB Data, which may be received from the control unit 240, from among the grayscale voltages to the display panel 210. The display apparatus 200 may reduce the amount of data processed by the control unit 240, by not gamma-correcting the image data RGB Data but gamma-correcting the grayscale voltages.
According to aspects of the invention, the second pixel driving voltage ELVSS may be configured to have the first level and the analog driving voltage AVDD may be configured to have the second level in correspondence to the maximum grayscale value to reduce a driving voltage of the source driver 230 and a driving voltage of the display panel 210. Therefore, overall power consumption of the display apparatus 200 may be reduced.
Referring to
It should be understood that the exemplary embodiments described therein should be considered in a descriptive sense only and not for purposes of limitation. Descriptions of features or aspects within each embodiment should typically be considered as available for other similar features or aspects in other embodiments.
It will be apparent to those skilled in the art that various modifications and variation can be made in the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2014-0103629 | Aug 2014 | KR | national |
| Number | Name | Date | Kind |
|---|---|---|---|
| 20060238480 | Furihata | Oct 2006 | A1 |
| 20060284806 | Maki | Dec 2006 | A1 |
| 20110069098 | Lee | Mar 2011 | A1 |
| 20110115832 | Lee | May 2011 | A1 |
| 20110273109 | Park | Nov 2011 | A1 |
| 20110298782 | Park | Dec 2011 | A1 |
| 20120256936 | Lee et al. | Oct 2012 | A1 |
| Number | Date | Country |
|---|---|---|
| 10-2011-0032245 | Mar 2011 | KR |
| 10-2011-0123983 | Nov 2011 | KR |
| 10-1084229 | Nov 2011 | KR |
| 10-1156446 | Jun 2012 | KR |
| 10-2012-0114989 | Oct 2012 | KR |
| 10-2014-0137811 | Dec 2014 | KR |
| Number | Date | Country | |
|---|---|---|---|
| 20160042687 A1 | Feb 2016 | US |
