KR20200050205A - Display Apparatus and Driving Method of the same - Google Patents

Abstract

According to an embodiment of the present invention, a display device capable of improving image expressive power comprises: a pixel processing unit calculating an average value of data signals with first color and data signals with second color within the N number of pixels adjacent to each other, calculating a weight according to rate of data signals with third color within the N number of pixels, and weighting the average value, wherein N is an integer of two or more; and a display panel representing an image based on data signals outputted from the pixel processing unit.

Description

Display Apparatus and Driving Method of the same}

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

2. Description of the Related Art With the development of information technology, the market for a display device that is a connection medium between a user and information is growing. Accordingly, the use of display devices such as light emitting display devices (LEDs), quantum dot display devices (Quantum Dot Display Apparatus; QDD), and liquid crystal displays (Liquid Crystal Display Apparatus: LCD) is increasing.

The display devices may include a display panel including sub-pixels, a driving unit outputting a driving signal driving the display panel, and a power supply unit generating power to be supplied to the display panel or the driving unit.

In the above display devices, when a driving signal, for example, a scan signal and a data signal, is supplied to sub-pixels formed on the display panel, the selected sub-pixel transmits light or emits light directly to display an image. It becomes possible.

Some of the display devices have many advantages such as fast response speed, high luminance and wide electrical and optical characteristics with a wide viewing angle, and mechanical characteristics that can be implemented in a flexible form. However, there is a problem in that a desired color cannot be realized in a configuration and a method for expressing an image.

The present invention for solving the above-mentioned problems of the background technology is to provide a display device and a driving method for improving the color spreading phenomenon due to abnormal light emission in an unwanted area, and improving the image expressive power of characters and the like. .

The display device according to the exemplary embodiment of the present invention calculates an average value of data signals of the first color and data signals of the second color within adjacent N pixels (where N is an integer of 2 or more), and the third color within the N pixels. It includes a pixel processor that calculates a weight according to a ratio occupied by data signals of, and assigns a weight to an average value, and a display panel that displays an image based on data signals output from the pixel processor.

The display device according to an exemplary embodiment of the present invention includes green sub-pixels continuously arranged in a first direction, red sub-pixels and blue sub-pixels alternately arranged in a first direction and a second direction intersecting the first direction. A display panel having a field, an average value of red data signals and blue data signals within adjacent N pixels (where N is an integer greater than or equal to 2), a weight according to a ratio occupied by green data signals within N pixels, and an average value And a data driver which converts digital data signals outputted from the pixel processor to analog data voltages and supplies them to the display panel.

The driving method of the display device according to the exemplary embodiment of the present invention adjusts the average values of the red data signals and the blue data signals by matching the input red, green, and blue data signals with the arrangement structure of the red, green, blue, and green subpixels. Calculating, comparing the levels of the green data signals to the red and blue data signals and calculating the ratio of the green data signals to the red, green and blue data signals, and the green data based on the ratio of the green data signals Calculating the weight of the signals and weighting the average value, and expressing the image on the display panel based on the corrected red, green, and blue data signals by applying the weight.

The present invention has an effect of preventing and improving color spreading due to abnormal light emission in an unwanted region by using a pixel processing method on a display panel having a red, green, blue, and green sub-pixel arrangement.

In addition, the present invention has an effect capable of improving image expression power, such as text, because it should be expressed in black or prevent abnormal luminescence when expressing a low luminance image.

1 is a schematic block diagram of a light emitting display device according to an exemplary embodiment of the present invention.
2 is a schematic circuit diagram of a sub-pixel.
3 is an exemplary cross-sectional view of a display panel.
4 is a diagram illustrating a pixel arrangement of a display panel according to an experimental example.
FIG. 5 is a diagram illustrating an image visible to a user when a white background screen and a black English letter V are expressed on the display panel of FIG.
FIG. 6 is a diagram illustrating a light emission state of sub-pixels when a white background screen and a black English letter V are expressed on the display panel of FIG. 4.
7 is a diagram illustrating pixel arrangement of a display panel according to an exemplary embodiment.
FIG. 8 is a diagram showing an image visible to a user when a white background screen and a black English letter V are expressed on the display panel of FIG. 7.
FIG. 9 is a diagram illustrating a light emission state of sub-pixels when a white background screen and a black English letter V are expressed on the display panel of FIG. 7.
10 is a view for explaining the pixel processing method of the experimental example.
11 is a view for explaining a pixel processing method according to an embodiment of the present invention.
12 to 14 are diagrams illustrating a light emission state of sub-pixels when a white background screen and a black English letter V are expressed on a display panel based on a pixel processing method according to an embodiment.
15 is a block diagram of a pixel processing unit according to an embodiment of the present invention.
16 is a flowchart illustrating a pixel processing method according to an embodiment of the present invention.
17 and 18 are views illustrating an apparatus having a pixel processing unit according to an embodiment of the present invention.

Advantages and features of the present invention, and methods for achieving them will be clarified with reference to embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different shapes, and only the present embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention pertains. It is provided to completely inform the person having the scope of the invention, and the present invention is only defined by the scope of the claims.

The shapes, areas, ratios, angles, numbers, etc. disclosed in the drawings for describing the embodiments of the present invention are exemplary, and the present invention is not limited to the illustrated matters. The same reference numerals refer to the same components throughout the specification. In addition, in the description of the present invention, when it is determined that detailed descriptions of related known technologies may unnecessarily obscure the subject matter of the present invention, detailed descriptions thereof will be omitted. When 'include', 'have', 'consist of', etc. mentioned in the present invention are used, other parts may be added unless '~ man' is used. When a component is expressed as a singular number, the plural number is included unless otherwise specified.

In interpreting the components, it is interpreted as including the error range even if there is no explicit description.

In the case of the description of the positional relationship, for example, when the positional relationship of two parts is described as '~ top', '~ upper', '~ bottom', '~ side', etc., 'right' Alternatively, one or more other parts may be located between the two parts unless 'direct' is used.

An element or layer being referred to as being "on" another element or layer includes all instances of another layer or other element immediately above or in between.

Also, the first, second, etc. are used to describe various components, but these components are not limited by these terms. These terms are only used to distinguish one component from another component. Accordingly, the first component mentioned below may be the second component within the technical spirit of the present invention.

The same reference numerals refer to the same components throughout the specification.

The area and thickness of each configuration shown in the drawings are shown for convenience of description, and the present invention is not necessarily limited to the area and thickness of the configuration.

Each of the features of the various embodiments of the present invention may be partially or wholly combined or combined with each other, technically various interlocking and driving is possible, and each of the embodiments may be independently performed with respect to each other or may be implemented together in an association relationship. It might be.

Hereinafter, the present invention will be described with reference to the drawings.

The display device according to the present invention may be implemented as a television, a video player, a personal computer (PC), a home theater, a smart phone, and the like, but is not limited thereto. The display device according to the present invention may be implemented as a light emitting display device (LED), a quantum dot display device (Quantum Dot Display Apparatus; QDD), a liquid crystal display device (Liquid Crystal Display Apparatus: LCD), or the like. Hereinafter, for convenience of description, a light emitting display device that expresses an image by directly emitting light will be taken as an example. The light emitting display device may be implemented based on an inorganic light emitting diode or may be implemented based on an organic light emitting diode. Hereinafter, for convenience of description, an example based on an organic light emitting diode will be described.

1 is a schematic block diagram of a light emitting display device according to an exemplary embodiment of the present invention, FIG. 2 is a schematic circuit configuration diagram of a sub-pixel, and FIG. 3 is an exemplary cross-sectional view of a display panel.

As shown in FIG. 1, the light emitting display device according to an embodiment of the present invention includes an image processing unit 110, a timing control unit 120, a data driving unit 130, a scan driving unit 140, a power supply unit 180, and a display. Panel 150 may be included.

The image processing unit 110 outputs a data enable signal DE and the like along with a data signal DATA supplied from the outside. The image processing unit 110 may output one or more of a vertical synchronization signal, a horizontal synchronization signal, and a clock signal in addition to the data enable signal DE.

The timing controller 120 receives a data signal DATA along with a driving signal including a data enable signal DE or a vertical synchronization signal, a horizontal synchronization signal, and a clock signal from the image processing unit 110. The timing controller 120 is a gate timing control signal GDC for controlling the operation timing of the scan driver 140 based on the driving signal and a data timing control signal DDC for controlling the operation timing of the data driver 130. And so on.

The data driver 130 samples and latches the digital data signal DATA supplied from the timing controller 120 in response to the data timing control signal DDC supplied from the timing controller 120 and then gamma reference voltage. It converts it into an analog data voltage and outputs it. The data driver 130 outputs the data voltage through the data lines DL1 to DLn. The data driver 130 may be formed in the form of an integrated circuit (IC).

The scan driver 140 outputs a scan signal in response to the gate timing control signal GDC supplied from the timing controller 120. The scan driver 140 outputs a scan signal consisting of a scan high voltage and a scan low voltage through scan lines GL1 to GLm. The scan driver 140 may be formed in the form of an integrated circuit (IC) or a gate in panel method on the display panel 150.

The power supply unit 180 is connected to the first power line EVDD and the second power line EVSS disposed on the display panel 150. The power supply unit 180 outputs a first potential power (high potential voltage) and a second potential power (low potential voltage) through the first power line EVDD and the second power line EVSS. The first potential power (high potential voltage) and the second potential power (low potential voltage) transmitted through the first power line EVDD and the second power line EVSS are sub-pixels SP of the display panel 150. ).

The display panel 150 displays an image corresponding to the power supplied from the power supply unit 180 and the data voltage and the scan signal supplied from the data driver 130 and the scan driver 140. The display panel 150 includes sub-pixels SP that operate to display an image.

The sub-pixels SP may include a red sub-pixel, a green sub-pixel, and a blue sub-pixel, or may include a white sub-pixel, a red sub-pixel, a green sub-pixel, and a blue sub-pixel, but are not limited thereto. The sub-pixels SP may have one or more different emission areas according to emission characteristics.

As illustrated in FIG. 2, one sub-pixel SP is electrically connected to the data line DL1, the scan line GL1, the first power line EVDD, and the second power line EVSS. One sub-pixel SP includes an organic light emitting diode OLED emitting light and a pixel circuit CC driving the same.

The pixel circuit CC includes a switching transistor for transmitting the data voltage, a capacitor for storing the data voltage, a driving transistor for generating a driving current based on the data voltage stored in the capacitor, and the like. The pixel circuit CC may further include a compensation circuit for compensating degradation of a driving transistor or an organic light emitting diode (OLED). The pixel circuit CC having a compensation circuit may be configured in various ways.

As shown in FIG. 3, the display panel 150 includes a first substrate 150a, a display area AA, a non-display area NA, and a protective film 150b. Sub-pixels are formed on the display area AA of the first substrate (or thin film transistor substrate) 150a based on the circuit illustrated in FIG. 2.

The sub-pixels formed on the display area AA are sealed by a protective film (or protective substrate) 150b. The display area AA is an area displaying an image, and an area excluding this area becomes a non-display area NA not displaying an image. The first substrate 150a and the protective film 150b may be formed of a material having rigidity or ductility such as glass, silicon, and polyimide, but is not limited thereto.

The sub-pixels may be arranged horizontally or vertically in the order of red (R), green (G), and blue (B) on the display area AA. In the high sub-pixels, red (R), green (G), and blue (B) may be one pixel (P). The arrangement order of the sub-pixels can be variously changed depending on the light emitting material, light emitting area, and the configuration (or structure) of the compensation circuit.

FIG. 4 is a diagram showing a pixel arrangement of a display panel according to an experimental example, and FIG. 5 is a diagram showing an image visible to a user when a white background screen and a black English letter V are expressed on the display panel of FIG. 4. FIG. 4 is a diagram illustrating a light emission state of sub-pixels when a white background screen and a black English letter V are expressed on the display panel of FIG. 4. 5 shows an input image in units of pixels, and FIG. 6 shows an input image in units of sub-pixels. As shown in FIG. 4, the display panel 150 of the experimental example has red, green, and blue sub-pixels RGB separated and arranged along the first direction (vertical direction). The arrangement structure of the sub-pixels RGB is as follows. The red sub-pixels R are continuously arranged along the first direction. The green sub-pixels G are continuously disposed along the first direction next to the red sub-pixels R. The blue sub-pixels B are continuously disposed along the first direction next to the green sub-pixels G.

When the white background screen and black English letter V shown in FIG. 5 are expressed on the display panel 150 of the experimental example shown in FIG. 4, the sub-pixels RGB emit light in the form shown in FIG. 6. At this time, the white background screen on the display panel 150 is represented by red, green, and blue sub-pixels (RGB) emitting light, but the black English letter V on the display panel 150 does not emit light. And blue sub-pixels RGB. FIG. 7 is a diagram showing a pixel arrangement of a display panel according to an embodiment, and FIG. 8 is a white background screen and black English letter V on the display panel of FIG. 7 Fig. 9 is a view showing the light emission state of the sub-pixels when the white background screen and the black English letter V are expressed on the display panel of Fig. 7. 8 shows an input image in units of pixels, and FIG. 9 shows an input image in units of sub-pixels.

As shown in FIG. 7, the display panel 150 according to an exemplary embodiment of the present invention includes green sub-pixels G continuously arranged along a first direction (vertical direction), and a first direction (vertical direction) and a second direction. The display panel 150 has red and blue sub-pixels RB alternately arranged along a direction (horizontal direction). When viewed only in the second direction, it may be an arrangement structure of red, green, blue, and green sub-pixels RGBG. The arrangement structure of the sub-pixels RGB will be described in more detail as follows.

The red sub-pixels R and the blue sub-pixels B are arranged in an alternating order of red and blue along the first direction. The green sub-pixels G are successively arranged along the first direction next to the red sub-pixels R and the blue sub-pixels B arranged in an alternating order of red and blue. The blue sub-pixels B and the red sub-pixels R are arranged next to the green sub-pixels G in the alternating order of green and blue along the first direction. The red sub-pixels R and the blue sub-pixels B arranged in an alternating order of red and blue from the left of the green sub-pixels G may be a first alternating group. Further, the blue sub-pixels B and the red sub-pixels R arranged in the alternating order of blue and red on the right side of the green sub-pixels G may be a second alternating group.

When the white background screen and black English letter V as shown in FIG. 8 are expressed on the display panel 150 of the embodiment of the present invention illustrated in FIG. 7, the sub-pixels RGB emit light in the form shown in FIG. 9. At this time, the white background screen on the display panel 150 is represented by red, green, and blue sub-pixels (RGB) that emit light, but the black English letter V on the display panel 150 does not emit light. And blue sub-pixels RGB.

When the display panel 150 of the experimental example shown in FIG. 6 is compared with the display panel 150 of the embodiment of the present invention shown in FIG. 9, the display panel 150 of the embodiment of the present invention shows the display panel 150 of the experimental example The defect area (indicated by the circle in FIG. 9) that cannot be seen can be confirmed.

As can be seen by comparing FIGS. 4 and 7, the arrangement structure of the sub-pixels RGB of the display panel 150 according to the exemplary embodiment of the present invention is different from the display panel 150 of the experimental example. Therefore, when the pixel processing method of the experimental example, for example, the Pixel Processing Algorithm (PPA) is used in the light emitting display device of the embodiment of the present invention, as shown in FIG. Due to this, a color spreading defect may occur, for example, a color spreading defect. For example, a portion to be expressed in black in a portion marked with a circle may not be represented in black, but a problem in gray may occur. As another example, a sub-pixel that should not be emitted may emit light, causing a problem that a desired character or the like cannot be expressed.

Accordingly, the inventors of the present invention have conducted various experiments to improve color spreading due to abnormal emission of unwanted regions. Through various experiments, a novel structured display device and a driving method were invented, which will be described below.

10 is a view for explaining a pixel processing method of an experimental example, FIG. 11 is a view for explaining a pixel processing method according to an embodiment of the present invention, and FIGS. 12 to 14 are pixel processing according to an embodiment of the present invention It is a drawing showing the light emission state of the sub pixels when the white background screen and the black English letter V are expressed on the display panel based on the method. The pixel processing method may be, for example, a pixel processing algorithm, and is not limited to terms.

The pixel processing method of the experimental example is implemented in a device such as the timing controller 120 so that the green data signal is used as it is (output) and the red data signal and the blue data signal use the average value of adjacent N pixels (N is an integer of 2 or more). do. The pixel processing method of the experimental example is as follows.

In the data signals shown in FIG. 10, the red, green, and blue data signals Rd, Gd, and Bd of the first pixel P1 all have a gradation value of 0, and the red, green, and blue data of the second pixel P2 It represents a case in which the signals Rd, Gd, and Bd all have a 255 gradation value. The red, green, and blue data signals Rd, Gd, and Bd having a 0 gradation value correspond to data for representing a black English letter V on the display panel 150, and red, green, and blue having a 255 gradation value The data signals Rd, Gd, and Bd correspond to data for representing a white background screen on the display panel 150.

The expressions for taking the average values of the red data signals Rd and the blue data signals Bd of two adjacent pixels according to the pixel processing method of the experimental example are expressed as the following equations. Same as 1.

[Equation 1]

R11 ’= (R11 + R12) / 2 and B12’ = (B11 + B12) / 2

R11 is an 11th red data signal to be applied to the 11th (or 1st column) red subpixel, R12 is a 12th red data signal to be applied to the 12th (or 2nd column) red subpixel, and B11 is 11th (also (1st column) may be an 11th blue data signal to be applied to the blue subpixel, and B12 may be a 12th blue data signal to be applied to the 12th (or 2nd column) blue subpixel. R11 'may be an average value of the 11th and 12th red data signals, and B12' may be an average value of the 11th and 12th blue data signals.

Based on Equation 1 above, when the average value of the red data signals Rd and the blue data signals Bd of two adjacent pixels is averaged, the red data signals Rd are R11 '= (R11 + R12). / 2 = (0 + 255) / 2 = 127 grayscale values, and blue data signals Bd become B12 '= (B11 + B12) / 2 = (0 + 255) / 2 = 127 grayscale values.

The average value of the red data signals Rd and the blue data signals Bd in units of adjacent 2 pixels is expressed as Equation 2 below.

[Equation 2]

V may be the number of vertical lines, H is the number of horizontal lines, and (n, m) may be data signals to be applied to sub-pixels arranged in rows and columns. The average value of the blue data signals Bd in units of adjacent 2 pixels is expressed as Equation 3 below.

[Equation 3]

V may be the number of vertical lines, H is the number of horizontal lines, and (n, m) may be data signals to be applied to sub-pixels arranged in rows and columns.

A device such as a timing controller 120 capable of embedding a pixel processing method may calculate a gradation value to be displayed on the display panel based on the above equation. However, the pixel processing method of the experimental example is not considered to be applicable to the arrangement structure of the sub-pixels of the display panel 150 of the embodiment of the present invention of FIG. 7.

Therefore, the red data signals Rd and the blue data signals Bd of the part representing the black English letter V as shown in FIG. 8 also need to have a zero gradation value like the green data signals Gd, but a 127 gradation value. It can be calculated as having. For example, if rendering is performed based on the pixel processing method of the experimental example, a portion in which pixel data is enlarged by averaging may also occur in a portion to be expressed in black based on the input data signals (Image). have. As a result, since the display panel 150 receiving the corresponding data signals (Image) expresses 127 gradations in an area where 0 gradations should be expressed as shown in FIG. 9, it may cause expression defects that cause abnormal luminescence perceived by the user. Can be.

As can be seen from the above description, in the pixel processing method of the experimental example, when the average values of the red and blue data signals Rd and Bd in the same pixel are greater than the green data signals Gd, the display panel of the embodiment of the present invention It is not possible to render suitable for (150). Therefore, the pixel processing method of the experimental example is in a state in which the display panel structure of the embodiment of the present invention is not considered, and thus, if it is used as it is, an expression defect that spreads colors, for example, a color spreading defect may occur.

In the pixel processing method of the embodiment of the present invention, an average value of N pixels (N is an integer of 2 or more) adjacent to a red data signal and a blue data signal is calculated. It is implemented to give a weight according to the ratio occupied by the green data signal of each pixel to the calculated average value. The ratio occupied by the green data signal may include the level of the green data signal. The pixel processing method of the embodiment of the present invention is as follows.

In the data signals Image shown in FIG. 11, the red, green, and blue data signals Rd, Gd, and Bd of the first pixel P1 all have a gradation value of 0 and the red of the second pixel P2, It shows a case in which the green and blue data signals Rd, Gd, and Bd all have a 255 gradation value. The red, green, and blue data signals Rd, Gd, and Bd having a 0 gradation value correspond to data for representing a black English letter V on the display panel 150, and red, green, and blue having a 255 gradation value The data signals Rd, Gd, and Bd correspond to data for representing a white background screen on the display panel 150.

The green data signal is obtained after taking the average values of the red data signals Rd and the blue data signals Bd of two adjacent pixels according to the pixel processing method of the embodiment of the present invention. The equation for assigning a weight according to the ratio of the fields Gd is as shown in Equation 4 below.

[Equation 4]

R11 '= {(R11 + R12) / 2} × {G11 / max (G11, G12)} and B12' = {(B11 + B12) / 2} × {G12 / max (G11, G12)}

R11 is an 11th red data signal to be applied to the 11th (or 1st column) red subpixel, R12 is a 12th red data signal to be applied to the 12th (or 2nd column) red subpixel, and B11 is 11th (also 1st column) 11th blue data signal to be applied to the blue sub-pixel, B12 is 12th (or 2nd column) blue 12th data signal to be applied to the blue sub-pixel, G11 is 11th (or 1st column) green The eleventh green data signal to be applied to the sub-pixel, and G12 may be a twelfth green data signal to be applied to the twelfth (or second column) green sub-pixel.

R11 'is the average value of the 11th and 12th red data signals, B12' is the average value of the 11th and 12th blue data signals, and G11 / max (G11, G12) and G12 / max (G11, G12) are the green of each pixel. It may be a weight according to the ratio occupied by the data signal.

Based on Equation 4 above, when the average value of the red data signals Rd and the blue data signals Bd of adjacent pixels is taken and weighted, the red data signals Rd are

 R11 '= {(R11 + R12) / 2} X {G11 / max (G11, G12)} = {(0 + 255) / 2} X (0/255) = 0 grayscale value, blue data signals (Bd) becomes B12 '= {(B11 + B12) / 2} X {G12 / max (G11, G12)} = {(0 + 255) / 2} X (255/255) = 127 gradation values.

Expressions for taking the average value of the red data signals Rd and the blue data signals Bd in units of adjacent 2 pixels are expressed by Equations 5 and 6. In Equations 5 and 6 below, the average operation is performed only between two adjacent pixels and may not be performed repeatedly. For example, the average operation of the first column and the second column / the average operation of the third column and the fourth column is possible, but the average operation of the first column and the second column / average operation of the second column and the third column may not be possible.

[Equation 5]

[Equation 6]

V may be the number of vertical lines, H is the number of horizontal lines, and (n, m) may be data signals to be applied to sub-pixels arranged in rows and columns.

Equations 7 and 8 are used to give weights of the green data signals Gd to the average values of the red data signals Rd and the blue data signals Bd calculated in units of adjacent 2 pixels. In the following equation, a larger value among the grayscale values of the green data signals Gd becomes a denominator and a smaller value becomes a numerator.

[Equation 7]

[Equation 8]

V may be the number of vertical lines, H is the number of horizontal lines, max is the maximum value, min is the minimum value, and (n, m) may be data signals to be applied to sub-pixels arranged in rows and columns.

A device such as a timing controller 120 capable of embedding a pixel processing method may calculate a gradation value to be displayed on the display panel based on the above equation. At this time, the pixel processing method of the embodiment of the present invention is configured in consideration of the arrangement structure of the sub-pixels of the display panel 150 of the embodiment of the present invention.

For example, in the pixel processing method of the embodiment of the present invention, considering the arrangement structure of the sub-pixels of the display panel 150 of the embodiment of the present invention shown in FIG. 12, red data signals Rd within the same pixel The weight may be calculated such that the gradation value of and the gradation value of the blue data signals Bd are always smaller than the gradation value of the green data signals Gd.

Accordingly, the red data signals Rd and the blue data signals Bd of the portion representing the black English letter V as shown in FIG. 13 can also be calculated to have a zero gradation value as the green data signals Gd. . For example, if rendering is performed based on the pixel processing method of the embodiment of the present invention, an average operation is performed on a portion to be expressed in black or low gradation based on input data signals (Image), for example, Rd In addition to the average value of / Bd, a weight, for example, a weight of Gd is applied, so that a portion in which pixel data becomes large does not occur, and a more natural character image can be expressed. Accordingly, since the display panel 150 receiving the corresponding data signals (Image) can express 0 gradations that are not recognized by the user in the region where 0 gradations should be expressed, as shown in FIG. 14, it is possible to remove or improve the expression defect. have.

As described above, in the pixel processing method of the embodiment of the present invention, since the average values of the red and blue data signals Rd and Bd within the same pixel are not greater than the gradation values of the green data signals Gd. For example, since the average values of Rd and Bd can be expressed lower than the gradation values of Gd, rendering suitable for the display panel 150 of the embodiment of the present invention can be performed. Therefore, in the pixel processing method of the embodiment of the present invention, when a black or low gradation is expressed in consideration of the display panel structure of the embodiment of the present invention, there is no occurrence of an expression defect that spreads colors, for example, a color spreading defect.

15 is a block diagram of a pixel processing unit according to an embodiment of the present invention, FIG. 16 is a flowchart for explaining a pixel processing method according to an embodiment of the present invention, and FIGS. 17 and 18 are according to an embodiment of the present invention It is a view showing a device having a pixel processing unit.

15 and 16, the pixel processing unit 160 according to an embodiment of the present invention includes an RGB data input unit 161, an R / B arithmetic unit 162, a G level comparison unit 165, and a G It includes a weighting unit 167 and an R'G'B 'data output unit 169.

The RGB data input unit 161 may receive red, green, and blue data signals RGB from the outside. The RGB data input unit 161 may be configured as, for example, a communication interface capable of receiving data signals in a communication method with an external device. The receiving of red, green and blue data signals RGB is performed by the RGB data input unit 161.

The R / B average calculation unit 162 may calculate an average value of the red data signals and the blue data signals among the red, green, and blue data signals RGB transmitted from the RGB data input unit 161. The R / B arithmetic unit 162 takes R11 '= (R11 + R12) / 2 and B12' = (B11 + B12) / 2 to take the average value of the red data signals and the blue data signals of two adjacent pixels. It can be calculated based on. In order to perform image rendering according to the arrangement structure of the red, green, blue, and green subpixels of the input red, green, and blue data signals (RGB), an average value of the red data signals and the blue data signals The step of calculating (S120) is performed by the R / B average calculation unit 162.

R11 is an 11th red data signal to be applied to the 11th red subpixel, R12 is a 12th red data signal to be applied to the 12th red subpixel, B11 is an 11th blue data signal to be applied to the 11th subpixel, and B12 is It may be a twelfth blue data signal to be applied to the twelfth blue sub-pixel. R11 'may be an average value of the 11th and 12th red data signals, and B12' may be an average value of the 11th and 12th blue data signals.

The G level comparator 165 compares the levels of the green data signals to the red and blue data signals transmitted from the RGB data input unit 161 and calculates the ratio of the green data signals to the red, green, and blue data signals. Can be. Step S130 of comparing the levels of the green data signals with respect to the red and blue data signals transmitted from the RGB data input unit 161 and calculating the proportion of the green data signals in the red, green and blue data signals (S130) It is made by the comparison unit 165.

The G weighting unit 167 calculates the weight of the green data signal based on the ratio of the green data signal of each pixel transmitted from the G level comparison unit 165, and calculates the weight of the calculated green data signal as red data signals. And blue data signals. Step S140 of calculating the weight of the green data signal and assigning the weight of the calculated green data signal to the average value of the red data signals and the blue data signals based on the ratio occupied by the green data signal of each pixel (S140) is a G weighting unit (167).

The G weighting unit 167 takes an average value of red data signals and blue data signals of two adjacent pixels, and then the weight according to the ratio of the green data signals Gd is R11 '= {(R11 + R12) / 2} × {G11 / max (G11, G12)} and B12 '= {(B11 + B12) / 2} × {G12 / max (G11, G12)}.

R11 is an 11th red data signal to be applied to the 11th red subpixel, R12 is a 12th red data signal to be applied to the 12th red subpixel, B11 is an 11th blue data signal to be applied to the 11th subpixel, and B12 is The 12th blue data signal to be applied to the 12th blue sub-pixel, G11 may be the 11th green data signal to be applied to the 11th green sub-pixel, and G12 may be the 12th green data signal to be applied to the 12th green sub-pixel.

R11 'is the average value of the 11th and 12th red data signals, B12' is the average value of the 11th and 12th blue data signals, and G11 / max (G11, G12) and G12 / max (G11, G12) are the green of each pixel. It may be a weight according to the ratio occupied by the data signal.

The R'G'B 'data output unit 169 outputs the corrected red, green, and blue data signals R'G'B'. After passing through the G weighting unit 167, the red, green, and blue data signals RGB input in the pixel processing unit 160 and the corrected red, green, and blue data signals R'G'B ' The state is corrected together. The step S150 of outputting the corrected red, green, and blue data signals R'G'B 'to the display panel is performed by the R'G'B' data output unit 169.

As shown in FIG. 17, the RGB data input unit 161, the R / B average calculation unit 162, the G level comparison unit 165, the G weighting unit 167, and the R'G'B 'data output unit ( The pixel processing unit 160 including 169) may be embedded in the timing control unit 120. The device configuration as shown in FIG. 17 may be applied when manufacturing a medium-sized or large-sized light emitting display device.

As shown in FIG. 18, the RGB data input unit 161, the R / B average calculation unit 162, the G level comparison unit 165, the G weighting unit 167, and the R'G'B 'data output unit ( The pixel processing unit 160 including 169 may be built in the integrated driving unit 120 & 130 in which the timing control unit 120 and the data driving unit 130 are integrated into one. The device configuration as shown in FIG. 18 can be applied when manufacturing a small or medium sized light emitting display device.

A display device and a driving method thereof according to an embodiment of the present invention can be described as follows.

The display device according to the exemplary embodiment of the present invention calculates an average value of data signals of the first color and data signals of the second color within adjacent N pixels (where N is an integer of 2 or more), and the third color within the N pixels. It includes a pixel processor that calculates a weight according to a ratio occupied by data signals of, and assigns a weight to an average value, and a display panel that displays an image based on data signals output from the pixel processor.

According to some embodiments of the present invention, the pixel processing unit weights the gradation values of the data signals of the first color and the gradation values of the data signals of the second color within the same pixel to be smaller than the gradation values of the data signals of the third color. Can be calculated.

According to some embodiments of the present invention, the pixel processing unit may assign a weight to a portion to be expressed in black or low gradation based on the input data signals and weight the result.

According to some embodiments of the present invention, the display panel includes green sub-pixels continuously arranged along the first direction, red sub-pixels alternately arranged along the first direction and the second direction intersecting the first direction, and blue. It includes sub-pixels, and the arrangement structure in the second direction may have an arrangement structure of red, green, blue, and green sub-pixels.

According to some embodiments of the present invention, the data signals of the first color are red data signals to be applied to the red sub pixels, and the data signals of the second color are blue data signals to be applied to the blue sub pixels, and the third color is The data signals of may be green data signals to be applied to the green sub-pixels.

The display device according to an exemplary embodiment of the present invention includes green sub-pixels continuously arranged in a first direction, red sub-pixels and blue sub-pixels alternately arranged in a first direction and a second direction intersecting the first direction. A display panel having a field, an average value of red data signals and blue data signals within adjacent N pixels (where N is an integer greater than or equal to 2), a weight according to a ratio occupied by green data signals within N pixels, and an average value And a data driver which converts digital data signals outputted from the pixel processor to analog data voltages and supplies them to the display panel.

According to some embodiments of the present invention, the pixel processing unit may calculate the weight so that the gradation values of the red data signals and the gradation values of the blue data signals are smaller than the gradation values of the green data signals within the same pixel.

According to some embodiments of the present invention, the pixel processing unit may calculate and weight an average value of a portion to be expressed in black or low gray scale based on the input data signals.

According to some embodiments of the present invention, the pixel processing unit may calculate an average value of red data signals and blue data signals among input red, green, and blue data signals, and input red, green, and blue data signals. The level comparison unit compares the level of the green data signals compared to the field and calculates the ratio of the green data signals in the red, green, and blue data signals, and calculates the weight of the green data signal based on the ratio of the green data signals. It may include a weighting unit for assigning the calculated weight to the average value.

According to some embodiments of the present invention, when there is a portion to be expressed in black or low gradation based on the input data signals, the pixel processing unit assigns weights to determine the average values of the red and blue data signals located in the same pixel. It can be lower than the gradation value of the green data signals.

According to some embodiments of the present invention, the timing controller may further include a timing controller that controls the data driver, and the timing controller may include an average calculator.

The driving method of the display device according to the exemplary embodiment of the present invention adjusts the average values of the red data signals and the blue data signals by matching the input red, green, and blue data signals with the arrangement structure of the red, green, blue, and green subpixels. Calculating, comparing the levels of the green data signals to the red and blue data signals and calculating the ratio of the green data signals to the red, green and blue data signals, and the green data based on the ratio of the green data signals Calculating the weight of the signals and weighting the average value, and expressing the image on the display panel based on the corrected red, green, and blue data signals by applying the weight.

According to some embodiments of the present invention, the step of assigning weights may calculate weights such that the gradation values of the red data signals and the gradation values of the blue data signals are smaller than the gradation values of the green data signals within the same pixel.

According to some embodiments of the present invention, the step of calculating the average value or the step of assigning a weight may be applied to a portion to be expressed in black or low gray scale based on the input data signals.

According to some embodiments of the present invention, the step of calculating the average value calculates the average value of the red data signals in units of adjacent N pixels by Equation 1 below,

[Equation 1]

The average value of blue data signals in units of adjacent N pixels is calculated by Equation 2 below,

[Equation 2]

According to some embodiments of the present invention, in the step of assigning weights, the weight of green data signals to the average value of red data signals is calculated by Equation 3 below,

[Equation 3]

The weight of the green data signals to the average value of the blue data signals is calculated by Equation 4 below,

[Equation 4]

According to some embodiments of the present invention, the corrected red, green, and blue data signals are red and blue data located in the same pixel when there is a portion to be expressed in black or low gradation based on the input data signals. The average value of the signals may be corrected to be expressed lower than the gradation value of the green data signals.

As described above, the present invention has an effect of rendering the input red, green, and blue data signals in a form suitable for a display panel having an arrangement structure of red, green, blue, and green sub-pixels. In addition, the present invention has an effect of removing or improving color spreading defects due to abnormal emission of unwanted regions by a pixel processing method suitable for a display panel having a red, green, blue, and green sub-pixel arrangement. In addition, the present invention has an effect capable of improving image expression power such as text by preventing an abnormal light emission phenomenon, especially when it is expressed in black or when a low luminance image is expressed.

The embodiments of the present invention have been described above with reference to the accompanying drawings, but the technical configuration of the present invention described above is in other specific forms without changing the technical spirit or essential features of the present invention by those skilled in the art to which the present invention pertains. It will be understood that it can be practiced. Therefore, the above-described embodiments are to be understood in all respects as illustrative and not restrictive. In addition, the scope of the present invention is indicated by the following claims rather than the detailed description. In addition, all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be construed as being included in the scope of the present invention.

120: timing control unit 130: data driving unit
140: scan driver 180: power supply
150: display panel 160: pixel processing unit
161: RGB data input unit 162: R / B average calculation unit
165: G level comparison unit 167: weighting unit
169: R'G'B 'data output

Claims (17)

The average value of the data signals of the first color and the data signals of the second color is calculated within adjacent N pixels (where N is an integer greater than or equal to 2), and the weight according to the ratio of the data signals of the third color within the N pixels A pixel processor for calculating and assigning the weight to the average value; And
And a display panel for displaying an image based on the data signals output from the pixel processing unit. According to claim 1,
The pixel processing unit,
A display device for calculating the weight so that the gradation values of the data signals of the first color and the gradation values of the data signals of the second color are smaller than the gradation values of the data signals of the third color within the same pixel. According to claim 1,
The pixel processing unit,
A display device for calculating the average value and assigning the weight to a portion to be expressed in black or low gray scale based on the input data signals. According to claim 1,
The display panel,
Green sub-pixels continuously arranged along the first direction,
And red sub-pixels and blue sub-pixels alternately disposed along the first direction and the second direction intersecting the first direction,
A display device in which the arrangement structure in the second direction is an arrangement structure of red, green, blue and green sub-pixels. The method of claim 4,
The data signals of the first color are red data signals to be applied to the red sub-pixels,
The data signals of the second color are blue data signals to be applied to the blue sub-pixels,
The display device of the third color is a green data signal to be applied to the green sub-pixels. A display panel having green sub-pixels continuously arranged along a first direction, and red sub-pixels and blue sub-pixels alternately arranged along the first direction and a second direction intersecting the first direction;
Calculate an average value of red data signals and blue data signals within adjacent N pixels (where N is an integer greater than or equal to 2), calculate a weight according to a ratio occupied by green data signals within the N pixel, and weight the average value A pixel processing unit that gives a; And
And a data driver that converts digital data signals output from the pixel processor into analog data voltages and supplies the data to the display panel. The method of claim 6,
The pixel processing unit,
A display device for calculating the weight so that the gradation values of the red data signals and the gradation values of the blue data signals are smaller than the gradation values of the green data signals within the same pixel. The method of claim 6,
The pixel processing unit,
A display device for calculating the average value and assigning the weight to a portion to be expressed in black or low gray scale based on the input data signals. The method of claim 6,
The pixel processing unit,
An average calculating unit calculating an average value of the red data signals and the blue data signals among the input red, green, and blue data signals;
A level comparison unit comparing the levels of the green data signals with respect to the input red, green, and blue data signals, and calculating a ratio of the green data signals in the red, green, and blue data signals; And
And a weighting unit that calculates a weight of the green data signal based on a ratio occupied by the green data signals and assigns the calculated weight to the average value. The method of claim 8,
When there is a part to be expressed in black or low gradation based on the input data signals,
The pixel processing unit assigns the weight to lower an average value of red and blue data signals located in the same pixel than a gradation value of green data signals. The method of claim 6,
Further comprising a timing control unit for controlling the data driving unit,
The timing control unit includes the average calculation unit. The input red, green, and blue data signals are matched to the arrangement structure of the red, green, blue, and green subpixels, and the input red, green, and blue data signals are based on the red, green, blue, and green subpixels. Calculating average values for the blue data signals and the blue light;
Comparing the levels of the green data signals with respect to the red and blue data signals, and calculating a ratio of the green data signals to the red, green, and blue data signals;
Calculating weights of the green data signals based on a ratio occupied by the green data signals, and assigning the weights to the average value; And
And expressing an image on a display panel based on the red, green, and blue data signals corrected by applying the weights. The method of claim 12,
The step of assigning the weight,
A method of driving a display device, wherein the weight value is calculated such that a gradation value of the red data signals and a gradation value of the blue data signals are smaller than the gradation values of the green data signals within the same pixel. The method of claim 12,
The step of calculating the average value or the step of assigning the weight,
A driving method of a display device applied to a portion to be expressed in black or low gradation based on the input data signals. The method of claim 12,
The step of calculating the average value,
The average value of the red data signals in units of the adjacent N pixels is calculated by Equation 1 below,
[Equation 1]

The average value of the blue data signals in units of the adjacent N pixels is calculated by Equation 2 below,
[Equation 2]

Method of driving the display device. The method of claim 15,
The step of assigning the weight,
The weight of the green data signals to the average value of the red data signals is calculated by Equation 3 below,
[Equation 3]

The weight of the green data signals to the average value of the blue data signals is calculated by Equation 4 below,
[Equation 4]

Method of driving the display device. The method of claim 12,
The corrected red, green and blue data signals are
When there is a portion to be expressed in black or low gradation based on the input data signals, the average value of the red and blue data signals located in the same pixel is corrected to be displayed lower than the gradation values of the green data signals. Driving method.

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