KR102344509B1 - Display device, display panel, contorller, and luminance contorl method - Google Patents

Abstract

The embodiments relate to a display device, a display panel, a controller, and a luminance control method, and more particularly, by independently performing peak luminance control for each color series, have weak characteristics in terms of product lifespan, afterimage, or deterioration. A display device, a display panel, a controller, and a luminance control method capable of alleviating product lifespan, afterimages, or deterioration of color sub-pixels.

Description

Display device, display panel, controller and luminance control method {DISPLAY DEVICE, DISPLAY PANEL, CONTORLLER, AND LUMINANCE CONTORL METHOD}

Embodiments relate to a display device, a display panel, a controller, and a luminance control method.

As the information society develops, the demand for a display device for displaying an image is increasing in various forms, and in recent years, various display devices such as a liquid crystal display device, a plasma display device, and an organic light emitting display device are utilized.

A plurality of sub-pixels defined by a plurality of data lines and a plurality of gate lines may be arranged on the display panel of the display device. The plurality of sub-pixels may be composed of sub-pixels expressing various colors.

Subpixels of various colors may have different physical properties and electrical characteristics (eg, amount of current flowing through circuit components in the subpixel, etc.) for each color series. For this reason, when controlling the luminance of each sub-pixel, afterimages and pixel deterioration levels occurring in relation to the sub-pixels for each color series may be different from each other.

As a result, subpixels of a specific color series may cause more severe afterimages or deterioration, and accordingly, the lifespan of circuit element components (eg, organic light emitting diodes, etc.) in the subpixels of a specific color series is further shortened. This can happen.

Against this background, an object of the embodiments is to provide a display device, a display panel, a controller, and a luminance control method capable of performing luminance control in consideration of color series.

Another object of the embodiments is to provide a display device, a display panel, a controller, and a luminance control method capable of independently controlling peak luminance for each color series.

Another object of the embodiments is to provide a display device, a display panel, a controller, and a luminance control method for controlling a relatively low peak luminance of a subpixel of a color series having a more vulnerable characteristic in terms of product lifespan, afterimage, or deterioration. is to provide

Another object of the embodiments is to provide a display device and display that control the peak luminance of a subpixel of a color series having a more vulnerable characteristic in terms of product lifespan, afterimage, or deterioration to relatively low in a low average image level section To provide a panel, a controller, and a luminance control method.

Another object of the embodiments is to provide a display device, a display panel, a controller, and a luminance control method capable of efficiently controlling peak luminance regardless of the type of color series in a high average image level section.

In embodiments, a display panel in which a plurality of data lines and a plurality of gate lines are disposed, a plurality of subpixels defined by the plurality of data lines and the plurality of gate lines are arranged, and the plurality of data lines are driven It is possible to provide a display device including a data driving circuit for driving a plurality of gate lines and a gate driving circuit for driving a plurality of gate lines.

Such a display device may include a controller for controlling peak luminance according to an average image level of image data.

Such a controller may perform independent peak luminance control processing for each color series.

The controller may control the peak luminance corresponding to the average image level according to the color series corresponding to the image data.

The controller, when the average image level is less than or equal to the threshold average image level,

The first peak luminance corresponding to the average image level when the color series corresponding to the image data is the first color series, and the second peak luminance corresponding to the average image level when the color series corresponding to the image data is the second color series Peak luminance can be controlled differently.

For example, the first color series may be white. The second color series may be a color different from white.

For example, the second color series may be one of red, green, and blue.

The second peak luminance may be lower than the first peak luminance.

When the average image level is less than or equal to the threshold average image level, when the color sequence corresponding to the image data is the third color sequence, the third peak luminance corresponding to the average image level is lower than the first peak luminance and higher than the second peak luminance can

A difference between the first peak luminance and the third peak luminance may be smaller than a difference between the third peak luminance and the second peak luminance.

A difference between the first peak luminance and the third peak luminance may be greater than a difference between the third peak luminance and the second peak luminance.

The third color series may be a color in which two or more primary colors are mixed or a color in which one or more primary colors are mixed with an achromatic color.

The controller is configured to: when the average image level exceeds the threshold average image level, a first peak luminance corresponding to the average image level when the color sequence corresponding to the image data is the first color sequence, and a color sequence corresponding to the image data In the case of the second color series, the second peak luminance corresponding to the average image level can be controlled equally.

Embodiments provide luminance control of a display device including a display panel in which a plurality of data lines and a plurality of gate lines are disposed, and a plurality of subpixels defined by the plurality of data lines and the plurality of gate lines are arranged. method can be provided.

The luminance control method may include recognizing a color sequence for an image from image data, and controlling a peak luminance corresponding to an average image level of the image data according to the recognized color sequence.

Embodiments include a color series recognition unit for recognizing a color series for an image from image data, an average image level calculating unit for calculating an average image level for image data, and controlling peak luminance according to the calculated average image level. , it is possible to provide a controller including a peak luminance control unit for controlling peak luminance corresponding to the calculated average image level according to the recognized color sequence.

The peak luminance controller may determine a peak luminance corresponding to an average image level by referring to peak luminance curves for each of two or more color series, and may determine a gamma curve corresponding to the determined peak luminance.

Embodiments provide a display panel in which a plurality of data lines, a plurality of gate lines, a plurality of subpixels defined by a plurality of data lines and a plurality of gate lines are arranged, and a display device including the same can do.

Each of the plurality of sub-pixels may include an organic light emitting diode, a driving transistor for driving the organic light emitting diode, and a switching transistor for supplying a data voltage to a gate node of the driving transistor.

When the first subpixel and the second subpixel have different peak luminance, the amount of current flowing through the organic light emitting diode in the first subpixel and the amount of current flowing through the organic light emitting diode in the second subpixel are the same or within a predefined allowable range There may be differences within

According to the embodiments described above, it is possible to provide a display device, a display panel, a controller, and a luminance control method capable of performing luminance control in consideration of a color series.

Also, according to embodiments, a display device, a display panel, a controller, and a luminance control method capable of independently performing peak luminance control for each color series may be provided.

In addition, according to the embodiments, a display device, a display panel, a controller, and a luminance control method that control a relatively low peak luminance of a sub-pixel of a color series having a more vulnerable characteristic in terms of product lifespan, afterimage, or deterioration, etc. can provide

In addition, according to embodiments, in a low average image level section, a display device that controls the peak luminance of a subpixel of a color series having a more vulnerable characteristic in terms of product lifespan, afterimage, or deterioration to relatively low. A panel, a controller, and a luminance control method can be provided.

According to the embodiments, it is possible to provide a display device, a display panel, a controller, and a luminance control method capable of efficiently controlling peak luminance regardless of the type of color series in a high average image level section.

1 is a system configuration diagram of a display device according to example embodiments.
2 is an exemplary diagram of a sub-pixel structure of a display device according to example embodiments.
3 is another exemplary diagram of a sub-pixel structure of a display device according to example embodiments.
4 and 5 are diagrams for explaining peak luminance control of a display device according to example embodiments.
6 is a diagram illustrating a peak luminance control curve of a display device according to example embodiments.
7 is a diagram for explaining independent peak luminance control for each color series of a display device according to example embodiments.
8 is a diagram illustrating two peak luminance control curves for independent peak luminance control for each color series of a display device according to example embodiments.
9 to 11 are diagrams illustrating three peak luminance control curves for independent peak luminance control for each color series of a display device according to example embodiments.
12 is a flowchart of a luminance control method of a display device according to example embodiments.
13 is a block diagram of a peak luminance control processing unit in a controller according to example embodiments.
14 is a diagram illustrating independent peak luminance control for each color series of a peak luminance control processing unit according to embodiments.
15 is a diagram illustrating currents flowing in first and second sub-pixels according to independent peak luminance control for each color series according to example embodiments.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to components of each drawing, the same components may have the same reference numerals as much as possible even though they are indicated in different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description may be omitted.

In addition, in describing the components of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, order, or number of the elements are not limited by the terms. When it is described that a component is “connected”, “coupled” or “connected” to another component, the component may be directly connected or connected to the other component, but other components may be interposed between each component. It should be understood that each component may be “interposed” or “connected”, “coupled” or “connected” through another component.

1 is a system configuration diagram of a display device 100 according to example embodiments.

Referring to FIG. 1 , in the display device 100 according to the present exemplary embodiments, a plurality of data lines DL and a plurality of gate lines GL are disposed, and a plurality of data lines DL and a plurality of The display panel 110 in which a plurality of sub-pixels SP defined by the gate lines GL of It includes a gate driving circuit 130 for driving the gate lines GL, and a controller 140 for controlling the data driving circuit 120 and the gate driving circuit 130 .

The controller 140 supplies various control signals DCS and GCS to the data driving circuit 120 and the gate driving circuit 130 to control the data driving circuit 120 and the gate driving circuit 130 .

The controller 140 starts a scan according to timing implemented in each frame, and uses image data (Data) input from the outside (eg, a host, a video controller, etc.) in the data driving circuit 120 . It outputs the converted data by converting it according to the format, and controls the data drive at an appropriate time according to the scan.

The controller 140 may be a timing controller used in a typical display technology or a control device that further performs other control functions including a timing controller.

The controller 140 may be implemented as a separate component from the data driving circuit 120 , or may be integrated with the data driving circuit 120 and implemented as an integrated circuit.

The data driving circuit 120 drives the plurality of data lines DL by receiving data from the controller 140 and supplying a data voltage to the plurality of data lines DL. Here, the data driving circuit 120 is also referred to as a source driving circuit.

The data driving circuit 120 may be implemented by including at least one source driver integrated circuit (SDIC).

Each source driver integrated circuit SDIC may include a shift register, a latch circuit, a digital to analog converter (DAC), an output buffer, and the like.

Each source driver integrated circuit SDIC may further include an analog-to-digital converter (ADC) in some cases.

The gate driving circuit 130 sequentially drives the plurality of gate lines GL by sequentially supplying a scan signal to the plurality of gate lines GL. Here, the gate driving circuit 130 is also referred to as a scan driving circuit.

The gate driving circuit 130 may be implemented by including at least one gate driver integrated circuit (GDIC).

Each gate driving circuit integrated circuit GDIC may include a shift register, a level shifter, and the like.

The gate driving circuit 130 sequentially supplies a scan signal of an on voltage or an off voltage to the plurality of gate lines GL under the control of the controller 140 .

When a specific gate line is opened by the gate driving circuit 130 , the data driving circuit 120 converts the data received from the controller 140 into an analog data voltage to generate a plurality of data lines DL. supplied with

The data driving circuit 120 may be located only on one side (eg, upper or lower side) of the display panel 110 , and in some cases, both sides of the display panel 110 (eg, according to a driving method, a panel design method, etc.) : It may be located on both the upper and lower sides).

The gate driving circuit 130 may be located on only one side (eg, left or right) of the display panel 110 , and in some cases, both sides (eg, left or right) of the display panel 110 according to a driving method, a panel design method, etc. For example, it can be located on both the left and right side).

The display device 100 according to the present embodiments may be an organic light emitting display device, a liquid crystal display device, a plasma display device, or the like.

When the display device 100 according to the present exemplary embodiment is an organic light emitting display device, each sub-pixel SP arranged on the display panel 110 includes an organic light emitting diode (OLED) which is a self-light emitting device and an organic light emitting diode (OLED). , and a circuit element such as a driving transistor for driving an organic light emitting diode (OLED).

The type and number of circuit elements constituting each sub-pixel SP may be variously determined according to a provided function and a design method.

The plurality of sub-pixels SP arranged in the display panel 110 according to the embodiments may include, for example, a white sub-pixel emitting white light, a red sub-pixel emitting red light, and a green light emitting green light. It may include sub-pixels of four colors including a sub-pixel and a blue sub-pixel emitting blue light.

The arrangement order and arrangement form of the white subpixel, the red subpixel, the green subpixel, and the blue blue subpixel may be variously determined.

For example, only the red subpixel, the green subpixel, and the blue subpixel among the four color subpixels may be driven.

As another example, only three sub-pixels including a white sub-pixel and sub-pixels of two colors (eg, red and green, red and blue, green and blue) may be driven among the four color sub-pixels.

2 is an exemplary diagram of a sub-pixel structure of the display device 100 according to embodiments, and FIG. 3 is another exemplary diagram of a sub-pixel structure of the display device 100 according to example embodiments.

Referring to FIG. 2 , in the display device 100 according to the exemplary embodiment, each subpixel SP includes an organic light emitting diode (OLED), a driving transistor (DRT) for driving the organic light emitting diode (OLED); A first transistor T1 electrically connected between the first node N1 of the driving transistor DRT and the data line DL, and a first node N1 and a second node N2 of the driving transistor DRT It may be implemented by including a capacitor (Cst) electrically connected therebetween.

The organic light emitting diode (OLED) may include a first electrode (eg, an anode electrode or a cathode electrode), an organic light emitting layer, and a second electrode (eg, a cathode electrode or an anode electrode).

The first electrode of the organic light emitting diode OLED may be electrically connected to the second node N2 of the driving transistor DRT. A ground voltage EVSS may be applied to the second electrode of the organic light emitting diode OLED.

The driving transistor DRT drives the organic light emitting diode (OLED) by supplying a driving current to the organic light emitting diode (OLED).

The driving transistor DRT has a first node N1 , a second node N2 , and a third node N3 .

The first node N1 of the driving transistor DRT is a node corresponding to a gate node and may be electrically connected to a source node or a drain node of the first transistor T1 .

The second node N2 of the driving transistor DRT may be electrically connected to the first electrode of the organic light emitting diode OLED, and may be a source node or a drain node.

The third node N3 of the driving transistor DRT is a node to which the driving voltage EVDD is applied, and may be electrically connected to a driving voltage line (DVL) that supplies the driving voltage EVDD, and has a drain. It can be a node or a source node.

The first transistor T1 may receive the first scan signal SCAN1 as a gate node through the gate line to be controlled on/off.

The first transistor T1 is turned on by the first scan signal SCAN1 to transfer the data voltage Vdata supplied from the data line DL to the first node N1 of the driving transistor DRT. can

This first transistor T1 is also referred to as a switching transistor.

The capacitor Cst is electrically connected between the first node N1 and the second node N2 of the driving transistor DRT, and receives the data voltage Vdata corresponding to the image signal voltage or a voltage corresponding thereto in one frame. You can keep it for a while.

As described above, one sub-pixel SP illustrated in FIG. 3 is a 2T (Transistor) 1C including two transistors DRT and one capacitor Cst to drive an organic light emitting diode (OLED). It can have a (Capacitor) structure.

The sub-pixel structure (2T1C structure) illustrated in FIG. 2 is merely an example for convenience of description, and one sub-pixel SP further includes one or more transistors, or one or more capacitors, depending on a function, a panel structure, etc. may further include.

FIG. 3 is a 3T (Transistor) 1C in which one sub-pixel SP further includes a second transistor T2 electrically connected between the second node N2 of the driving transistor DRT and the reference voltage line RVL. (Capacitor) is a diagram showing the structure by way of example.

Referring to FIG. 3 , the second transistor T2 is electrically connected between the second node N2 of the driving transistor DRT and the reference voltage line RVL to transmit the second scan signal SCAN2 to the gate node. Upon authorization, on-off may be controlled.

The drain node or source node of the second transistor T2 is electrically connected to the reference voltage line RVL, and the source node or the drain node of the second transistor T2 is the second node N2 of the driving transistor DRT. can be electrically connected to

The second transistor T2 may, for example, be turned on during a display driving period, and may be turned on during a sensing driving period for sensing a characteristic value of the driving transistor DRT or a characteristic value of the organic light emitting diode OLED. can be come

The second transistor T2 is turned on by the second scan signal SCAN2 in accordance with the corresponding driving timing (eg, the display driving timing or the initialization timing within the sensing driving period), and is supplied to the reference voltage line RVL. The reference voltage Vref may be transferred to the second node N2 of the driving transistor DRT.

In addition, the second transistor T2 is turned on by the second scan signal SCAN2 in accordance with the corresponding driving timing (eg, sampling timing within a period during sensing driving), and the second node ( The voltage of N2) may be transferred to the reference voltage line RVL.

In other words, the second transistor T2 controls the voltage state of the second node N2 of the driving transistor DRT or applies the voltage of the second node N2 of the driving transistor DRT to the reference voltage line RVL. ) can be forwarded to

Here, the reference voltage line RVL may sense the voltage of the reference voltage line RVL and convert it into a digital value, and may be electrically connected to an analog-to-digital converter that outputs sensed data including the digital value.

The analog-to-digital converter may be included in the source driver integrated circuit SDIC implementing the data driving circuit 120 .

The sensing data output from the analog-to-digital converter may be used to sense a characteristic value (eg, threshold voltage, mobility, etc.) of the driving transistor (DRT) or a characteristic value (eg, threshold voltage) of an organic light emitting diode (OLED).

On the other hand, the capacitor Cst is not a parasitic capacitor (eg, Cgs, Cgd) which is an internal capacitor existing between the first node N1 and the second node N2 of the driving transistor DRT, It may be an external capacitor intentionally designed outside the driving transistor DRT.

Each of the driving transistor DRT, the first transistor T1 , and the second transistor T2 may be an n-type transistor or a p-type transistor.

Meanwhile, the first scan signal SCAN1 and the second scan signal SCAN2 may be separate gate signals. In this case, the first scan signal SCAN1 and the second scan signal SCAN2 may be respectively applied to the gate node of the first transistor T1 and the gate node of the second transistor T2 through different gate lines. have.

In some cases, the first scan signal SCAN1 and the second scan signal SCAN2 may be the same gate signal. In this case, the first scan signal SCAN1 and the second scan signal SCAN2 may be commonly applied to the gate node of the first transistor T1 and the gate node of the second transistor T2 through the same gate line. .

Each subpixel structure illustrated in FIGS. 2 and 3 is merely an example for description, and may further include one or more transistors or, in some cases, one or more capacitors.

Alternatively, each of the plurality of subpixels may have the same structure, and some of the plurality of subpixels may have a different structure.

4 and 5 are diagrams for explaining peak luminance control (PLC) of the display device 100 according to example embodiments.

The display device 100 may control the power consumption by controlling the peak luminance by referring to the peak luminance control curve that defines the peak luminance of the sub-pixels according to an average picture level (APL) of the image data. .

That is, the display device 100, through a peak luminance control (PLC), increases the peak luminance of the entire display area of the display panel 110 as the ratio of the actual display area in which the image is actually output is smaller. Higher luminance and high image quality can be provided.

For example, in Case A, when the average image level (APL) is 100%, that is, the image data (Data) with gradation values of R, G, and B (255, 255, 255) is being output in the entire display area. Assuming that the peak luminance at the time (in this case, the entire display area corresponds to the actual display area) is 100 nits, the first gamma reference voltage ( VG1) is created.

Also, when the average image level (APL) is 60% in Case B, that is, the grayscale value of the image data (Data) is the same as in Case A, but the actual display area is reduced and the average image level (APL) is reduced to 60% In this case, the peak luminance may appear as 200 nits increased from 100 nits, and the second gamma reference voltage VG2 including the voltage of the highest gray level corresponding to the peak luminance PL of 200 nits is generated.

Also, in Case C, when the average image level (APL) is 25%, that is, the grayscale value of the image data (Data) is the same as in Cases A and B, but the actual display area is reduced more than in Case B, so the average image level (APL) ) is reduced to 25%, the peak luminance may appear as 400 nits, which is increased from 200 nits, and the third gamma reference voltage G3 including the voltage of the highest gray corresponding to the peak luminance PL of 400 nits is is created

As such, the display device 100 increases the peak luminance when the average image level APL decreases and decreases the peak luminance when the average image level APL increases, thereby reducing power consumption, It is possible to prevent device deterioration and afterimage.

Meanwhile, the peak luminance control processing unit in the controller 140 of the display device 100 may perform peak luminance control (PLC).

Accordingly, the controller 140 may further include a peak luminance control processing unit in addition to a typical timing controller. The peak luminance control processing unit in the controller 140 will be described in detail later with reference to FIG. 13 .

As described above, in the display device 100 according to the embodiments, in order to perform peak luminance control, the peak luminance control curve ( PLC curve), it is possible to control the peak luminance corresponding to the currently obtained average image level (APL).

In the peak luminance control curve, the X-axis corresponds to the average image level (APL (%)), and the Y-axis corresponds to the peak luminance (PL).

According to the peak luminance control curve illustrated in FIG. 6 , when the average image level (APL) is in the range of 0 to 25 (%), there is little or no change in the peak luminance according to the change in the average image level (APL), and the average In a range where the image level APL is greater than 25 (%), the peak luminance PL may decrease as the average image level APL increases.

The currently obtained average image level (APL) may be information calculated based on image data received by the controller 140, may be calculated from image data corresponding to one frame, or both. It may be calculated from image data corresponding to the above frames.

6 is a diagram illustrating a peak luminance control curve of the display device 100 according to example embodiments.

Referring to FIG. 6 , the controller 140 of the display device 100 may refer to one peak luminance control curve 600 for peak luminance control.

For example, the sub-pixels SP arranged on the display panel 110 may include sub-pixels of four colors (white (W), red (R), green (G), and blue (B)). have.

In this specification, red (R), green (G), and blue (B) are referred to as primary colors (also referred to as primary colors or primary colors or primary colors) or simply colors.

In this regard, when expressing (driving) white (W) and primary colors (R, G, B), one peak luminance control curve 600 may be equally used.

In this way, when one peak luminance control curve 600 is used equally in the expression (drive) of white (W) and primary colors (R, G, B), color (R, G, B) series The amount of current flowing through the organic light emitting diode (OLED) during expression (drive) becomes greater than the amount of current flowing through the organic light emitting diode (OLED) during expression (drive) of white (W), which intensifies afterimage and pixel deterioration, or It may cause an imbalance with respect to pixel deterioration or the like.

In this specification, one color series may have the same meaning as one color or a concept including two or more similar colors.

In order to prevent or reduce this phenomenon, the present embodiments may provide an independent peak luminance control function for each color series. Hereinafter, an independent peak luminance control function for each color series will be described with reference to FIGS. 7 to 14 .

7 is a diagram for explaining independent peak luminance control for each color series of the display device 100 according to embodiments.

Referring to FIG. 7 , the controller 140 of the display device 100 according to the embodiments controls the peak luminance according to the average image level APL of the image data Data, but According to the corresponding color series (the current color series), it is possible to control the current average image level (APL) and the corresponding peak luminance.

As described above, by controlling the peak luminance in consideration of the color series (the current color series), it is possible to alleviate or prevent a phenomenon in which an afterimage and pixel deterioration degree differ for each color (W, R, G, B). This can help to extend the lifespan of circuit components (eg, OLED, etc.) in the sub-pixel.

The above-mentioned first color series may be white (W), and the second color series may be one of red (R), green (G), and blue (B).

As described above, by independently controlling the peak luminance according to the white (W) corresponding to the first color series and the primary colors (R, G, and B) corresponding to the second color series, white (W) and the primary color (R) , G, B) may alleviate or prevent a difference in an afterimage and deterioration degree of each sub-pixel. Through this, it is possible to reduce or eliminate the lifetime deviation of circuit components (eg, OLED) in subpixels by color.

Accordingly, when the image is of a first color series (eg, white), the controller 140 controls the peak luminance by referring to the first peak luminance control curve 710 , and the image is of a second color series (eg, white). In the case of red, green, and blue), the peak luminance may be controlled by referring to the second peak luminance control curve 720 .

8 is a diagram illustrating two peak luminance control curves 710 and 720 for independent peak luminance control for each color series of the display device 100 according to embodiments.

Referring to FIG. 8 , in a section in which the average image level APL exceeds the threshold average image level TH, the first peak luminance control curve 710 corresponding to the first color series and the first peak luminance control curve 710 corresponding to the second color series are used. The second peak luminance control curve 720 is the same.

However, in a section in which the average image level APL is equal to or less than the threshold average image level TH, the first peak luminance control curve 710 corresponding to the first color sequence and the second peak luminance control curve corresponding to the second color sequence (720) is different.

Here, the threshold average picture level TH may be set to a fixed value or a variable value with various values. For example, the threshold average picture level TH may be a value between 20 and 40%, such as 25%, 30%, and the like, and in some cases, may be variously changed to an arbitrary value within an arbitrary range.

As described above, it can be seen that the first peak luminance control curve 710 corresponding to the first color series and the second peak luminance control curve 720 corresponding to the second color series exist separately, but the average image level (APL) ) exceeds the threshold average image level TH, has one curve trajectory, and in the section where the average image level APL is equal to or less than the threshold average image level TH, it has one peak luminance control curve having two curve trajectories. can also be seen as

However, hereinafter, for convenience of explanation, as an embodiment, the first peak luminance control curve 710 corresponding to the first color series and the second peak luminance control curve 720 corresponding to the second color series are separately provided. Assume that it exists.

As described above, in a section in which the average image level APL is equal to or less than the threshold average image level TH, the first peak luminance control curve 710 corresponding to the first color series and the second peak corresponding to the second color series Since the luminance control curve 720 is different from each other, when the average image level APL is equal to or less than the threshold average image level TH, the color sequence corresponding to the image data is the first color sequence. The first peak luminance PL1 corresponding to the image level APL and the second peak luminance PL2 corresponding to the average image level APL when the color series corresponding to the image data is the second color series are mutually obtained can be controlled differently.

Also, in a section in which the average image level APL exceeds the threshold average image level TH, the first peak luminance control curve 710 corresponding to the first color sequence and the second peak luminance corresponding to the second color sequence Since the control curves 720 are equal to or similar to each other within a predefined allowable range, the controller 140 controls the image data corresponding to the image data when the average image level APL is equal to or less than the threshold average image level TH. The first peak luminance PL1 corresponding to the average image level APL when the color series is the first color series, and the average image level APL when the color series corresponding to the image data is the second color series The corresponding second peak luminance PL2 may be controlled to be the same or similar to each other within a predefined allowable range.

That is, when the average image level APL exceeds the threshold average image level TH, the controller 140 corresponds to the average image level APL when the color sequence corresponding to the image data is the first color sequence. When the first peak luminance PL1 to be used and the second color series corresponding to the image data are the second color series, the second peak luminance PL2 corresponding to the average image level APL may be controlled in the same manner.

As described above, in a section in which the amount of current for each color series and afterimage/deterioration deviation is large, that is, in a section in which the average image level (APL) is equal to or less than the threshold average image level (TH), white (W) corresponding to the first color series and By controlling the peak luminance differently according to the primary colors (R, G, B) corresponding to the second color series, characteristic deviations (current amount deviation, residual image deviation, pixel deterioration deviation, subpixels) for each first and second color series It can adaptively alleviate or eliminate variations in the lifespan of circuit components.

Meanwhile, referring to FIG. 8 , in a section in which the average image level APL is equal to or less than the threshold average image level TH, when the color sequence corresponding to the image data is the second color sequence, the second color sequence corresponds to the average image level APL. The second peak luminance PL2 may be lower than the first peak luminance PL1 corresponding to the average image level APL when the color series corresponding to the image data is the first color series.

Therefore, in a section in which the average image level (APL) is equal to or less than the threshold average image level (TH), the primary color ( With respect to R, G, and B), by lowering the peak luminance, the amount of current in the region (sub-pixel) corresponding to the primary colors R, G, and B corresponding to the second color series can be reduced. It is possible to alleviate or remove the deepening of the afterimage and the deepening of deterioration in the primary colors (R, G, and B) corresponding to the second color series.

For example, even if the first subpixel and the second subpixel have different peak luminance due to independent peak luminance control for each color series, the first subpixel (eg, a subpixel expressed in the first color series) The amount of current flowing through the organic light emitting diode (OLED) and the amount of current flowing through the organic light emitting diode (OLED) within the second sub-pixel (eg, a sub-pixel expressed in a second color series) may be the same within a predefined allowable range. have.

On the other hand, the controller 140 controls the color corresponding to the image data in a section where the amount of current for each color series and afterimage/degradation deviation is small (that is, a section in which the average image level APL exceeds the threshold average image level TH). By controlling the peak luminance in the same way for the case where the series is the first color series and the case where the series is the second color series, the peak luminance control can be efficiently and simply performed in a section where the amount of current for each color series and the residual image/deterioration deviation are small. .

Meanwhile, as an example, a third color series different from white (W), which may correspond to the first color series, and primary colors (eg, R, G, B), which may correspond to, the second color series may exist. The peak control for the third color series may be different from the peak control for the first color series and the peak control for the second color series.

In the following, independent peak control for three color series will be described.

9 to 11 are diagrams illustrating three peak luminance control curves 710 , 720 , and 900 for independent peak luminance control for each color series of the display device 100 according to embodiments.

9 to 11 , for independent peak luminance control for each color series, the controller 140 controls a third peak luminance for a third color series that is a color series different from the first color series and the second color series. A control curve 900 may further be used.

9 to 11 , when the average image level APL exceeds the threshold average image level TH, when the color sequence corresponding to the image data is the first color sequence, it corresponds to the average image level APL When the first peak luminance PL1 to be obtained, the second peak luminance PL2 corresponding to the average image level APL when the color series corresponding to the image data is the second color series, and the color series corresponding to the image data are In the case of the third color series, the third peak luminance PL3 corresponding to the average image level APL may be the same or similar to each other within a predefined allowable range.

However, referring to FIGS. 9 to 11 , when the average image level APL is less than or equal to the threshold average image level TH, when the color sequence corresponding to the image data is the third color sequence, it corresponds to the average image level APL The third peak luminance PL3 to be used includes the first peak luminance PL1 corresponding to the average image level APL when the color series corresponding to the image data is the first color series, and the color series corresponding to the image data. In the case of the second color series, it may have a value between the second peak luminance PL2 corresponding to the average image level APL.

That is, when the color series corresponding to the image data is the third color series, the third peak luminance PL3 corresponding to the average image level APL is the average image when the color series corresponding to the image data is the first color series. It may be lower than the first peak luminance PL1 corresponding to the level APL and higher than the second peak luminance PL2 corresponding to the average image level APL when the color series corresponding to the image data is the second color series have.

The third color series, which is a color series different from the first color series and the second color series, is a color in which two or more primary colors (e.g., two or more of R, G, and B) are mixed (MC; It can be the highest vivid color (also called Pure Color) or a color (MC) that is a mixture of one or more primary colors (e.g. at least one of R, G, B) and an achromatic color (e.g. white, black, gray, etc.). have.

Accordingly, independent peak luminance control can be performed for three different color series.

The peak luminance control of the third color series may be variously modified according to the color similarity of the third color series to the first color series and the second color series. In this case, a predefined color table may be referred to.

For example, when the color similarity between the third color series and the first color series and the color similarity between the third color series and the second color series are at the same or similar levels, as shown in FIG. 9 , the average image level In a section where (APL) is equal to or less than the threshold average image level (TH), the third peak luminance control curve 900 may be located in the middle between the first peak luminance control cover 710 and the second peak luminance control curve 720 . have.

Accordingly, when the average image level APL is equal to or less than the threshold average image level TH, when the color series corresponding to the image data is the third color series, the third peak luminance PL3 corresponding to the average image level APL is the first peak luminance PL1 corresponding to the average image level APL when the color series corresponding to the image data is the first color series, and the average image when the color series corresponding to the image data is the second color series It may be an intermediate value of the second peak luminance PL2 corresponding to the level APL.

As another example, when the color similarity between the third color series and the first color series is greater than the color similarity between the third color series and the second color series, as shown in FIG. 10 , the average image level APL is In a section equal to or less than the threshold average image level TH, the third peak luminance control curve 900 may be located closer to the first peak luminance control cover 710 than the second peak luminance control curve 720 .

Accordingly, when the average image level APL is equal to or less than the threshold average image level TH, when the color series corresponding to the image data is the third color series, the third peak luminance PL3 corresponding to the average image level APL is closer to the first peak luminance PL1 corresponding to the average image level APL in the case of the first color series than the second peak luminance PL2 corresponding to the average image level APL in the case of the second color series. can be a value.

That is, the difference between the first peak luminance PL1 and the third peak luminance PL3 may be smaller than the difference between the third peak luminance PL3 and the second peak luminance PL2 .

As described above, the display device 100 may perform precise peak luminance control with respect to the third color series having a higher color similarity to the first color series than the second color series.

As another example, when the color similarity between the third color series and the second color series is greater than the color similarity between the third color series and the first color series, as shown in FIG. 11 , the average image level (APL) In a section equal to or less than the threshold average image level TH, the third peak luminance control curve 900 may be located closer to the second peak luminance control cover 720 than the first peak luminance control curve 710 .

According to this, when the average image level APL is equal to or less than the threshold average image level TH, when the color series corresponding to the image data is the third color series, the third peak luminance PL3 corresponding to the average image level APL is closer to the second peak luminance PL2 corresponding to the average image level APL in the case of the second color series than the first peak luminance PL1 corresponding to the average image level APL in the case of the first color series. can be a value.

That is, the difference between the first peak luminance PL1 and the third peak luminance PL3 may be greater than the difference between the third peak luminance PL3 and the second peak luminance PL2 .

As described above, the display device 100 may perform precise peak luminance control with respect to the third color series having a higher color similarity to the second color series than the first color series.

Hereinafter, the independent peak luminance control method for each color series described above will be briefly described again.

12 is a flowchart of a luminance control method of the display device 100 according to example embodiments.

Referring to FIG. 12 , in the method of controlling the brightness of the display device 100 according to the embodiments, recognizing a color sequence for an image from image data ( S1210 ), and image data according to the recognized color sequence It may include controlling the peak luminance corresponding to the average image level (APL) for (Data) ( S1220 ) and the like.

Using the above-described peak luminance control method, the peak luminance is controlled in consideration of the color series (current color series), thereby alleviating the phenomenon of different afterimages and pixel deterioration for each color (W, R, G, B) or can prevent

The peak luminance control step (S1220) includes the steps of determining the type of the color series recognized in the step S1210 (S1221), and when it is determined as the first color series, performing the first peak luminance control (S1231); If it is determined as the second color series, performing a second peak luminance control ( S1232 ), and when it is determined as the third color series, performing a third peak luminance control ( S1233 ). .

In the peak luminance control step S1220 , the controller 140 , when the average image level APL is equal to or less than the threshold average image level TH, generates a first color sequence corresponding to the average image level APL in the case of the first color series. The peak luminance PL1 and the second peak luminance PL2 corresponding to the average image level APL in the case of the second color series may be controlled differently.

In the peak luminance control step S1220 , the controller 140 controls the average image level APL to correspond to the average image level APL in the case of the first color series when the average image level APL exceeds the threshold average image level TH. The first peak luminance PL1 and the second peak luminance PL2 corresponding to the average image level APL in the case of the second color series may be equally controlled.

The above-mentioned first color series may be white (W), and the second color series may be one of red (R), green (G), and blue (B) primary colors.

The second peak luminance PL2 may be lower than the first peak luminance PL1 .

13 is a block diagram of the peak luminance control processing unit 1300 in the controller 140 according to embodiments, and FIG. 14 is an independent peak luminance control for each color series of the peak luminance control processing unit 1300 according to embodiments. It is a drawing.

13 and 14 , the controller 140 may include a peak luminance control processing unit 1300 that performs independent peak luminance control for each color series.

The peak luminance control processing unit 1300 includes a color sequence recognition unit 1310 that recognizes a color sequence for an image from image data, and an average image level calculator 1320 that calculates an average image level (APL) for the image data. and a peak luminance control unit 1330 that controls peak luminance according to the calculated average image level (APL), but controls peak luminance corresponding to the calculated average image level (APL) according to a color sequence corresponding to the image data. may include

The peak luminance control unit 1330 refers to the peak luminance curves 710 , 720 , and 900 for two or more color series that can be stored in the form of a lookup table 1400 , and the peak luminance corresponding to the average image level (APL) (PL) can be determined.

That is, the peak luminance control unit 1330 controls one or more peak luminance control curves 710 , 720 , and 900 corresponding to one or more color series information input from among the two or more peak luminance control curves 710 , 720 , and 900 for each color series. one or more of them), and referring to this, it is possible to determine the peak luminance corresponding to the input average image level (APL).

The peak luminance controller 1330 may control one or more corresponding sub-pixels to have the determined peak luminance.

For example, the peak luminance controller 1330 may determine a gamma curve corresponding to the determined peak luminance.

The control process for causing the one or more subpixels to have the determined peak luminance is one of a process for determining a gamma curve, a process for selecting a gamma reference voltage, a process for modulating data supplied to the data driving circuit 120 , and the like. may include more than one.

By using the peak luminance control processing unit 1300 in the controller 140 as described above, by controlling the peak luminance in consideration of the color series (the current color series), afterimage and pixel deterioration for each color (W, R, G, B) It can alleviate or prevent phenomena of different degrees.

The peak luminance control unit 1330 is configured to generate a first peak luminance PL1 corresponding to the average image level APL in the case of the first color series when the average image level APL is equal to or less than the threshold average image level TH; In the case of the second color series, the second peak luminance PL2 corresponding to the average image level APL may be differently controlled.

The peak luminance control unit 1330 is configured to generate a first peak luminance PL1 corresponding to the average image level APL in the case of the first color series when the average image level APL is equal to or less than the threshold average image level TH; In the case of the second color series, the second peak luminance PL2 corresponding to the average image level APL may be differently controlled.

When the average image level APL exceeds the threshold average image level TH, the peak luminance control unit 1330 is configured to generate a first peak luminance PL1 corresponding to the average image level APL in the case of the first color series. And, in the case of the second color series, the second peak luminance PL2 corresponding to the average image level APL may be equally controlled.

The above-mentioned first color series may be white (W), and the second color series may be one of red (R), green (G), and blue (B).

The second peak luminance PL2 may be lower than the first peak luminance PL1 .

As described above, in order to perform independent peak luminance control for each color series, the peak luminance control unit 1330 refers to the peak luminance curves 710, 720, and 900 for two or more color series to determine the average image level ( By controlling the peak luminance PL corresponding to the APL), it is possible to perform more precise and faster peak luminance control processing.

15 is a diagram illustrating currents flowing in the first and second sub-pixels SP1 and SP2 according to independent peak luminance control for each color series according to example embodiments. However, the display device 100 is an organic light emitting display device as an example.

Referring to FIG. 15 , according to the above-described independent peak luminance for each color series, when the color series corresponding to image data is the first color series in a section where the average image level is equal to or less than the threshold average image level, the first sub-pixel ( The first peak luminance of SP1 (eg: a sub-pixel emitting white light) and a color series corresponding to the image data are a second color series (SP2, eg: a sub-pixel emitting red, green, or blue light) In this case, even if the first peak luminance of the second sub-pixel is controlled differently, the amount of current I1 flowing through the organic light-emitting diode OLED of the first sub-pixel SP1 and the organic light-emitting diode OLED of the second sub-pixel SP2 are controlled differently. ) may be the same or different within a predefined allowable range.

According to the embodiments described above, it is possible to provide the display device 100 , the display panel 110 , the controller 140 , and the luminance control method capable of performing luminance control in consideration of color series.

Also, according to embodiments, the display device 100 , the display panel 110 , the controller 140 , and the luminance control method capable of independently performing peak luminance control for each color series may be provided.

In addition, according to the embodiments, the display device 100 and the display panel 110 control the peak luminance of the sub-pixels of the color series having weaker characteristics in terms of product lifespan, afterimage, or deterioration to a relatively low level. , the controller 140 and the luminance control method may be provided.

In addition, according to the embodiments, in the low average image level section, the display device 100 controls the peak luminance of the subpixels of the color series having more vulnerable characteristics in terms of product lifespan, afterimage, or deterioration to be relatively low. ), the display panel 110 , the controller 140 , and a luminance control method may be provided.

According to embodiments, in the high average image level section, the display device 100, the display panel 110, the controller 140, and the luminance control method capable of efficiently controlling the peak luminance regardless of the type of color series are provided. can provide

The above description and the accompanying drawings are merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains can combine configurations within a range that does not depart from the essential characteristics of the present invention. , various modifications and variations such as separation, substitution and alteration will be possible. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

100: display device
110: display panel
120: data driving circuit
130: gate driving circuit
140: controller
1300: peak luminance control processing unit
1310: color recognition unit
1320: Average image level calculator
1330: peak luminance control unit

Claims (21)

a display panel on which a plurality of data lines and a plurality of gate lines are disposed, and a plurality of subpixels defined by the plurality of data lines and the plurality of gate lines are arranged;
a data driving circuit for driving the plurality of data lines;
a gate driving circuit for driving the plurality of gate lines; and
A controller for controlling peak luminance according to the average image level of the image data, and controlling the peak luminance corresponding to the average image level according to the color series corresponding to the image data,
When the first subpixel and the second subpixel have different peak luminances,
The amount of current flowing through the organic light emitting diode in the first subpixel and the amount of current flowing through the organic light emitting diode in the second subpixel are the same or have a difference within a predefined allowable range.
According to claim 1,
The controller is
When the average picture level is less than or equal to a threshold average picture level,
a first peak luminance corresponding to the average image level when the color series corresponding to the image data is a first color series;
A display device configured to differently control a second peak luminance corresponding to the average image level when the color series corresponding to the image data is a second color series.
3. The method of claim 2,
The first color series is white,
The second color series is one of red, green, and blue.
3. The method of claim 2,
When the average picture level is less than or equal to the threshold average picture level,
The second peak luminance is lower than the first peak luminance.
5. The method of claim 4,
When the average picture level is less than or equal to the threshold average picture level,
When the color series corresponding to the image data is a third color series that is a color series different from the first color series and the second color series, the third peak luminance corresponding to the average image level is,
The display device is lower than the first peak luminance and higher than the second peak luminance.
6. The method of claim 5,
The difference between the first peak luminance and the third peak luminance is
The display device is smaller than a difference between the third peak luminance and the second peak luminance.
6. The method of claim 5,
The difference between the first peak luminance and the third peak luminance is
The display device is larger than a difference between the third peak luminance and the second peak luminance.
6. The method of claim 5,
The third color series is a color in which two or more primary colors are mixed or a color in which one or more primary colors are mixed with an achromatic color.
3. The method of claim 2,
The controller is
when the average picture level exceeds the threshold average picture level,
a first peak luminance corresponding to the average image level when the color series corresponding to the image data is the first color series;
A display device configured to equally control a second peak luminance corresponding to the average image level when the color series corresponding to the image data is the second color series.
In a luminance control method of a display device including a display panel in which a plurality of data lines and a plurality of gate lines are disposed, and a plurality of subpixels defined by the plurality of data lines and the plurality of gate lines are arranged. in,
recognizing a color sequence for an image from image data; and
controlling the peak luminance corresponding to the average image level of the image data according to the recognized color series,
When the first subpixel and the second subpixel have different peak luminances,
An amount of current flowing through the organic light emitting diode in the first subpixel and an amount of current flowing through the organic light emitting diode in the second subpixel are the same or different within a predefined allowable range.
11. The method of claim 10,
In the controlling step,
When the average picture level is less than or equal to a threshold average picture level,
a first peak luminance corresponding to the average image level when the recognized color series is a first color series;
When the recognized color series is a second color series, a method for controlling a luminance of a display device to differently control a second peak luminance corresponding to the average image level.
12. The method of claim 11,
The first color series is white,
wherein the second color series is one of red, green, and blue.
12. The method of claim 11,
When the average picture level is less than or equal to the threshold average picture level,
wherein the second peak luminance is lower than the first peak luminance.
12. The method of claim 11,
In the controlling step,
when the average picture level exceeds the threshold average picture level,
a first peak luminance corresponding to the average image level when the recognized color series is the first color series;
When the recognized color series is the second color series, a second peak luminance corresponding to the average image level is equally controlled.
a color sequence recognition unit for recognizing a color sequence for an image from image data;
an average image level calculator for calculating an average image level for the image data; and
a peak luminance control unit for controlling peak luminance according to the calculated average image level, and controlling peak luminance corresponding to the calculated average image level according to the recognized color series;
When the peak luminance control unit controls the recognized color series to have different peak luminances for the case of the first color series and the case of the second color series,
A controller for a display device that controls the amount of current flowing through the organic light emitting diode within the subpixel of the first color series and the amount of current flowing through the organic light emitting diode within the subpixel of the second color series to be the same or different within a predefined allowable range .
16. The method of claim 15,
The peak luminance control unit,
When the average picture level is less than or equal to a threshold average picture level,
a first peak luminance corresponding to the average image level when the recognized color series is the first color series;
A controller for a display device that differently controls a second peak luminance corresponding to the average image level when the recognized color series is the second color series.
17. The method of claim 16,
The first color series is white,
The second color series is one of red, green, and blue.
17. The method of claim 16,
When the average picture level is less than or equal to the threshold average picture level,
The second peak luminance is lower than the first peak luminance.
17. The method of claim 16,
The peak luminance control unit,
when the average picture level exceeds the threshold average picture level,
a first peak luminance corresponding to the average image level when the recognized color series is the first color series;
A controller for a display device that equally controls a second peak luminance corresponding to the average image level when the recognized color series is the second color series.
16. The method of claim 15,
The peak luminance control unit,
Determining the peak luminance corresponding to the average image level by referring to the peak luminance curves for each of two or more color series,
A controller for a display device that determines a gamma curve corresponding to the determined peak luminance.
a plurality of data lines and a plurality of gate lines; and
a plurality of subpixels defined by the plurality of data lines and the plurality of gate lines are arranged;
Each of the plurality of sub-pixels,
an organic light emitting diode,
a driving transistor for driving the organic light emitting diode;
a switching transistor supplying a data voltage to the gate node of the driving transistor;
When the first subpixel and the second subpixel have different peak luminances,
The amount of current flowing through the organic light emitting diode in the first subpixel and the amount of current flowing through the organic light emitting diode in the second subpixel are
Display panels that are the same or differ within a predefined tolerance.

Images