KR20220047063A - Display device, control circuit and driving method for the same - Google Patents

Abstract

Embodiments of the present invention can provide a display device and a driving method thereof. The display device comprises: a display panel including a display region and a non-display region; a data driver configured to generate a data signal by receiving an image signal and supply the data signal to the display panel; a gate driver configured to generate a gate signal and supply the generated gate signal to the display panel; a plurality of illumination sensors disposed in the display region and configured to sense the intensity of each emitted light and generate pieces of illumination data; a first control circuit configured to control the data driver and the gate driver and supply the image signal to the data driver; and a second control circuit configured to receive the pieces of illumination data from the plurality of illumination sensors, respectively, calculate first median illumination data from the pieces of illumination data, and adjust the brightness of the display panel corresponding to the first median illumination data. According to the present invention, power consumption can be reduced.

Description

Display device, control circuit and method of driving display device

The present specification relates to a display device, a control circuit, and a method of driving a display device, and more particularly, to a display device, a control circuit, and a driving method of the display device capable of preventing a malfunction from being performed.

As the information society develops, the demand for a display device for displaying an image is increasing in various forms. As the display device, various types of display devices such as a liquid crystal display device (LCD) and an electroluminescence display device (ELD) are used.

In addition, an electroluminescence display device (ELD) includes a quantum dot light emitting display device (QD) including a quantum dot (QD), an inorganic light emitting display device (Inorganic Light Emitting Display device) ), and an organic light emitting display device.

Among the above display devices, the electroluminescent display device may have excellent response speed, viewing angle, color reproducibility, and the like. In addition, there is an advantage that can be implemented with a thin thickness.

The display device as described above may be employed in a smart phone, a tablet PC, and the like for executing various application programs. In addition, the display device is employed in a smart phone, a tablet PC, and the like, and the smart phone and the tablet PC have a thin bezel, so that the operation is convenient and the aesthetic feeling is improved.

Smartphones and tablet PCs are powered by batteries to operate. In the case of receiving power from the battery, there is an advantage that the user can use it while moving without using it at a designated location used by the user. However, there is a problem in that the use time for using the display device is limited. In addition, if the brightness of the display device is not adjusted, there is a problem in that visibility of an image displayed by external light decreases or glare occurs.

In addition, when sensors used for various applications are disposed on the bezel portion of the display device, there is a limitation in implementing a thin bezel due to the area where the sensors are disposed.

Accordingly, the inventors of the present specification have invented a display device, a control circuit, and a method for driving a display device that can reduce power consumption to increase usage time, suppress glare and improve visibility.

In addition, the inventors of the present specification have invented a display device that can be implemented with a thin bezel.

The problems to be solved according to the embodiments of the present specification to be described below are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

A display device according to an exemplary embodiment of the present specification includes a display panel including a display area and a non-display area, a data driver receiving an image signal to generate a data signal and supplying the data signal to the display panel, and generating a gate signal and a gate driver that supplies the display panel, is disposed in the display area, and controls a plurality of illuminance sensors that detect the intensity of irradiated light and generate illuminance data, respectively, control the data driver and the gate driver, but supply an image signal to the data driver a first control circuit; and a second control circuit that receives illuminance data from the plurality of illuminance sensors, calculates first intermediate illuminance data from the illuminance data, and adjusts the brightness of the display panel in response to the first intermediate illuminance data. .

The control circuit according to another embodiment of the present specification includes a first control circuit that receives and outputs an image signal and illuminance data corresponding to the intensity of light detected by the illuminance sensor from a plurality of illuminance sensors disposed in a display area of a display panel, respectively. and a second control circuit configured to receive illuminance, calculate first intermediate illuminance data from the illuminance data received from a plurality of illuminance sensors, and adjust the brightness of the display panel in response to the first intermediate illuminance data.

A method of driving a display device according to another exemplary embodiment of the present specification includes receiving illuminance data respectively sensed from a plurality of illuminance sensors disposed in a display area in a display panel including a display area and a non-display area, and a plurality of The method may include calculating first intermediate illuminance data using the illuminance data supplied from the illuminance sensor and adjusting the brightness of the display panel in response to the first intermediate illuminance data.

According to the embodiments of the present specification, there is an effect of reducing power consumption.

In addition, according to the embodiments of the present specification, the brightness of the display device is changed according to the illuminance, thereby improving visibility of a displayed image and preventing glare.

In addition, according to the embodiments of the present specification, there is an effect that a bezel can be implemented to be thin.

Effects of the embodiments disclosed herein are not limited to the effects mentioned above. In addition, the embodiments disclosed herein may generate other effects not mentioned above, which will be clearly understood by those skilled in the art from the following description.

1 is a structural diagram illustrating a display device according to embodiments of the present invention.
2 is a circuit diagram illustrating a pixel according to embodiments of the present invention.
3A and 3B are plan views illustrating an exemplary embodiment of the display panel shown in FIG. 1 .
4 is a cross-sectional view illustrating a display device according to the present invention.
FIG. 5 is a structural diagram illustrating an embodiment of the second control circuit shown in FIG. 1 .
6 is a graph illustrating illuminance data detected by a plurality of illuminance sensors.
7 is a flowchart illustrating an algorithm operating in the second control circuit shown in FIG. 5 .
8 is a conceptual diagram illustrating a method of displaying an image in the display device of the present invention.
9 is a conceptual diagram illustrating a light emitting area in the display device of the present invention.
10 is a conceptual diagram illustrating a position of a light emitting area in the display device of the present invention.
11 is a flowchart illustrating a method of driving a display device according to the present invention.

Advantages and features of the present specification, and a method for achieving them, will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present specification is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only these embodiments allow the disclosure of the present specification to be complete, and common knowledge in the technical field to which this specification belongs It is provided to fully inform the possessor of the scope of the invention, and the present specification is only defined by the scope of the claims.

The shapes, sizes, proportions, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present specification are exemplary, and thus the present specification is not limited to the illustrated matters. Like reference numerals refer to like elements throughout. In addition, in the description of the present specification, if it is determined that a detailed description of a related known technology may unnecessarily obscure the subject matter of the present specification, the detailed description thereof will be omitted. When "includes", "having", "consisting of", etc. mentioned in this specification are used, other parts may be added unless "only" is used. When a component is expressed in the singular, the case in which the plural is included is included unless otherwise explicitly stated.

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

In the case of a description of the positional relationship, for example, when the positional relationship of two parts is described as "on", "on", "on", "next to", etc., "immediately" Alternatively, one or more other parts may be placed between two parts unless "directly" is used.

In the case of a description of a temporal relationship, for example, "immediately" or "directly" when the temporal precedence is described as "after", "after", "after", "before", etc. It may include cases that are not continuous unless " is used.

In the case of a description of the signal flow relationship, for example, even in the case of "a signal is transmitted from node A to node B", unless "directly" or "directly" is used, node A goes through another node Thus, a case in which a signal is transmitted to node B may be included.

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

Each feature of the various embodiments of the present specification may be partially or wholly combined or combined with each other, technically various interlocking and driving are possible, and each of the embodiments may be implemented independently of each other or may be implemented together in a related relationship. may be

The display device of the present invention includes a display panel including a display area and a non-display area, a data driver receiving an image signal to generate a data signal and supplying the data signal to the display panel, and a gate generating a gate signal and supplying the data signal to the display panel a plurality of illuminance sensors disposed in the driver, the display area, each sensing the intensity of irradiated light and generating illuminance data, a first control circuit controlling the data driver and the gate driver, and supplying an image signal to the data driver; and a second control circuit configured to receive illuminance data from the illuminance sensor, calculate first intermediate illuminance data from the illuminance data, and adjust the brightness of the display panel in response to the first intermediate illuminance data.

In addition, the second control circuit is configured to use the remaining illuminance data that is not excluded except for the illuminance data having an illuminance value smaller than the first intermediate illuminance data among the plurality of illuminance data received from the plurality of illuminance sensors. The median illuminance data may be calculated, and the brightness of the display panel may be adjusted in response to the second median illuminance data.

Also, the second control circuit may calculate the first median illuminance data by subtracting the intensity of internal light from the illuminance data.

In addition, the plurality of illuminance sensors are disposed on the rear surface of the display panel, the light emitted by the image displayed on the display panel includes internal light, and the second control circuit subtracts the intensity of internal light from the light detected by the illuminance sensor Thus, the first median illuminance data may be calculated.

Also, the second control circuit may include a lookup table in which image signal information on the image signal and information on the intensity of internal light are matched.

In addition, the first control circuit further outputs a dimming signal for adjusting the brightness of the display panel in response to a user's setting, and the image signal information matched with the intensity of internal light in the lookup table is the image displayed on the display panel. It may include at least one of the sum of the grayscales of the image signals included in one frame among the plurality of frames, the intensity of the dimming signal, the size of the light emitting area on which the image is displayed on the display panel, and the position of the light emitting area in the display panel. there is.

In addition, two illuminance sensors among the plurality of illuminance sensors may be disposed at positions symmetrical to each other.

The control circuit according to the present specification receives illuminance data corresponding to the intensity of light sensed by the illuminance sensor from the first control circuit for receiving and outputting an image signal and from a plurality of illuminance sensors disposed in the display area of the display panel, respectively, and a control circuit including a second control circuit for calculating first intermediate illuminance data from the illuminance data received from the illuminance sensor of

In addition, the second control circuit calculates second intermediate illuminance data using the remaining illuminance data that is not excluded except for illuminance data smaller than the first intermediate illuminance data among the plurality of illuminance data received from the plurality of illuminance sensors. and the brightness of the display panel may be adjusted in response to the second intermediate illuminance data.

Also, the second control circuit may calculate the first median illuminance data by subtracting the intensity of internal light from the illuminance data.

Also, the second control circuit may include a lookup table in which image signal information on the image signal and information on the intensity of internal light are matched.

In addition, the first control circuit further outputs a dimming signal for adjusting the brightness of the display panel in response to a user's setting, and the image signal information matched with the intensity of internal light in the lookup table is the image displayed on the display panel. It may include at least one of the sum of the grayscales of the image signals included in one frame among the plurality of frames, the intensity of the dimming signal, the size of the light emitting area on which the image is displayed on the display panel, and the position of the light emitting area in the display panel. .

A method of driving a display device according to the present specification includes the steps of receiving illuminance data corresponding to the intensity of light sensed from a plurality of illuminance sensors disposed in a display region in a display panel including a display region and a non-display region, the plurality of illuminance sensors The method may include calculating first intermediate illuminance data using the illuminance data supplied from the illuminance data source and adjusting the brightness of the display panel in response to the first intermediate illuminance data.

In addition, the adjusting of the brightness of the display panel includes excluding illuminance data smaller than the first intermediate illuminance data among the plurality of illuminance data received from the plurality of illuminance sensors, and using the remaining illuminance data that is not excluded. The method may further include calculating the median illuminance data and adjusting the brightness of the display panel in response to the calculated second median illuminance data.

In addition, the calculating of the first median illuminance data may include calculating the first median illuminance data by subtracting the intensity of internal light from the illuminance data.

In addition, the step of calculating the first intermediate illuminance data may further include the step of identifying information on the intensity of the internal light from a lookup table in which the image signal information on the image signal and the information on the intensity of the internal light are matched can

In addition, the driving method of the display device further outputs a dimming signal for adjusting the brightness of the display panel in response to a user setting, and the image signal information matched with the intensity of internal light in a lookup table is displayed on the display panel. At least one of the sum of the grayscales of the image signals included in one frame among the plurality of frames of the image, the intensity of the dimming signal, the size of the light emitting area on which the image is displayed on the display panel, and the position of the light emitting area in the display panel. can

Hereinafter, various embodiments of the present specification will be described in detail with reference to the accompanying drawings.

1 is a structural diagram illustrating a display device according to embodiments of the present invention.

Referring to FIG. 1 , the display device 100 includes a display panel 110 , a data driver 120 , a gate driver 130 , an illuminance sensor 140 , a first control circuit 150 , and a second control circuit 160 . ) may be included.

The display panel 110 may include a plurality of pixels 101 . The plurality of pixels 101 may be arranged in a matrix form in the display panel 110 , but the present invention is not limited thereto. The plurality of pixels 101 may include pixels emitting red, green, and blue light, respectively. However, the color of light emitted from each pixel is not limited thereto. Also, the display panel 110 may have a rectangular shape. However, the present invention is not limited thereto.

A plurality of gate lines GL1 to GLn and a plurality of data lines DL1 to DLm are disposed on the display panel 110 , and a plurality of pixels 101 are disposed on the gate lines GL1 to GLn and the data lines DL1 to DLm. can be connected Each pixel 101 may receive a data signal transmitted through the data lines DL1 through DLm in response to the gate signal transmitted through the gate lines GL1 through GLn. However, the wirings disposed on the display panel 110 are not limited thereto.

The brightness of the display panel 110 may be adjusted according to the intensity of external light. When the intensity of external light is strong, there is a risk that the visibility of the image displayed on the display panel 110 is reduced by external light, and when the intensity of external light is weak, glare is generated by the image displayed on the display panel 110. . However, when the brightness of the display panel 110 is adjusted to correspond to the intensity of external light, visibility may be improved and an effect of suppressing glare occurs. In addition, since the brightness of the display device 100 is automatically adjusted, the usage time of the display device 100 may be increased when power is supplied using a battery.

Also, the brightness of the display panel 110 may be adjusted in response to a user's setting. The brightness of the display panel 110 may be adjusted in response to a dimming signal corresponding to the user's brightness setting.

The data driver 120 may be connected to the data lines DL1 to DLm to transmit a data signal to the pixel 101 through the data lines DL1 to DLm. Here, the data driver 120 is illustrated as a single individual, but is not limited thereto. The data driver 120 may be implemented as an integrated circuit. Also, the driver circuit 120 may receive an image signal and convert the received image signal RGB into a data signal.

The gate driver 130 may be connected to the gate lines GL1 to GLn and may supply a gate signal to the plurality of pixels 101 through the gate lines GL1 to GLn. Here, the gate driver 130 is illustrated as being disposed on one side of the display panel 110 , but is not limited thereto, and may be disposed on both sides of the display panel 110 . In addition, one gate driver may be connected to the odd-numbered gate line and the other gate driver may be connected to the even-numbered gate line. In addition, the display device 100 does not include a separate gate driver, and a gate generation circuit for generating a gate signal may be disposed on the display panel 110 .

The illuminance sensor 140 may detect the intensity of irradiated light, and may generate and output illuminance data corresponding to the sensed intensity of light. The illuminance data output from the illuminance sensor 140 may be a digital signal. Also, the illuminance sensor 140 may measure the intensity of light in a visible ray band. However, the present invention is not limited thereto.

The first control circuit 150 may control the data driver 120 and the gate driver 130 . The first control circuit 150 may receive the image signal RGB and output it to the data driver 120 . Also, the first control circuit 140 may correct the image signal RGB and then output it to the data driver 120 .

Also, the first control circuit 140 may output a data control circuit DCS for controlling the data driver 120 and a gate control signal GCS for controlling the gate driver 130 . Also, the first control circuit 150 may receive a dimming signal corresponding to a user's setting from an external set device. The first control circuit 150 may adjust the brightness of the display panel 110 in response to the received dimming signal.

The second control circuit 160 may control the illuminance sensor 140 . The second control circuit 160 may adjust the brightness of the display panel 110 in response to the illuminance data transmitted from the illuminance sensor 140 . Accordingly, in a dark environment, the brightness of the display panel 110 is lowered to suppress glare, and in a bright environment, the brightness of the display panel 110 is increased to increase visibility. The second control circuit 160 may generate a dimming signal in response to the illuminance data and transmit it to the first control circuit 150 .

When the brightness of the display panel 110 is automatically changed in response to the surrounding environment, an effect of reducing power consumption may occur. In addition, the intensity of external light may be low in a dark environment and the intensity of external light may be high in a bright environment. When the brightness of the display panel 110 decreases in a dark environment and the brightness of the display panel 110 increases in a bright environment, the user may not feel glare.

Here, although the first control circuit 150 and the second control circuit 160 are illustrated as different components, the present invention is not limited thereto, and may be included in one component. Also, the first control circuit 150 and the second control circuit 160 may be different application programs or algorithms processed within one control circuit.

2 is a circuit diagram illustrating a pixel according to embodiments of the present invention.

Referring to FIG. 2 , the pixel 101 may include a light emitting diode ED and a pixel circuit for supplying a driving current to the light emitting diode ED.

The light emitting diode ED may include an anode electrode, a cathode electrode, and a light emitting layer disposed between the anode electrode and the cathode electrode. Light may be emitted from the light emitting layer corresponding to the magnitude of the driving current flowing through the light emitting layer. The emission layer may include an inorganic layer or an organic layer. In addition, the light emitting layer may include a plurality of layers. The light emitting diode ED may emit red, green, and blue light. In addition, the light emitting diode ED may emit white light. However, the color of the light emitted from the light emitting diode ED is not limited.

The pixel circuit includes a first transistor M1 that supplies a driving current to the light emitting diode ED, and a second transistor M2 that supplies a data signal Vdata to the first transistor M1 in response to the gate signal GATE. ) and a capacitor Cst for maintaining the voltage of the data signal Vdata.

The first transistor M1 has a first electrode connected to a first power line VL supplying a first voltage, a second electrode connected to a first node N1, and a gate electrode connected to a second node N2. can be connected In addition, in the first transistor M1 , a driving current may flow to the first node N1 in response to the voltage of the second node N2 .

The second transistor M2 has a gate having a first electrode connected to the data line DL supplying a data signal, a second electrode connected to a second node N2, and a gate electrode supplying a gate signal GATE. It may be connected to the line GL. In addition, the second transistor M2 may supply the data signal Vdata to the second node N2 in response to the gate signal GATE1 .

The capacitor Cst may have a first electrode connected to the first node N1 and a second electrode connected to the second node N2 . The capacitor Cst may allow the voltage of the second node N2 to be maintained.

In addition, although the first transistor M1 and the second transistor M2 included in the pixel circuit are illustrated as being N MOS transistors, the present invention is not limited thereto, and the first transistor M1 and the second transistor M2 are It may be a P MOS transistor. Also, the pixel circuit employed in the display device 100 is not limited thereto.

3A and 3B are plan views illustrating an exemplary embodiment of the display panel shown in FIG. 1 , and FIG. 4 is a cross-sectional view illustrating a display device according to the present invention.

3A and 3B , the display panel 110 may include a display area 110a and a non-display area 110b.

A plurality of pixels 101 may be disposed in the display area 110a. Also, the display area 110a may have a rectangular shape. The display area 110a may display an image using the plurality of pixels 101 arranged therein. The non-display area 110b is disposed on the periphery of the display area 110a , and wirings for supplying signals and/or voltages to the display area 110a may be disposed.

In addition, four illuminance sensors S1, S2, S3, and S4 may be disposed at positions overlapping the display area 110a. Each of the illuminance sensors S1 , S2 , S3 , and S4 may be disposed on the edge of the display area 110a. The four illuminance sensors S1, S2, S3, and S4 are respectively disposed one at a position overlapping the upper and lower sides of the display area 110a, and at positions overlapping the right and left sides of the display area 110a. Each may be arranged one by one. However, the number and positions of the illuminance sensors disposed to overlap the display area 110a are not limited thereto.

Since each illuminance sensor S1 , S2 , S3 , and S4 is disposed at a position overlapping the display area 110a of the display panel 110 , the width of the non-display area 110b may be reduced. The non-display area 110b of the display panel 110 may be referred to as a bezel.

At least two illuminance sensors among the illuminance sensors S1 , S2 , S3 , and S4 disposed in the display area 110a may be disposed at positions symmetrical to each other. The two illuminance sensors S1 and S4 and the other two illuminance sensors S2 and S3 may be disposed at positions symmetrical to each other with respect to the center of the display panel 110 , respectively. Due to this, even if one illuminance sensor is covered, the other illuminance sensor may not be covered.

In addition, since the illuminance sensors S1 , S2 , S3 , and S4 are disposed at different positions of the display area 110a, the intensity of external light can be more accurately measured. For example, as shown in FIG. 3B , when the first illuminance sensor S1 disposed on the upper end of the display area 110a is partially or completely covered by the object 300, the first illuminance sensor S1 ) cannot detect the intensity of external light, but can normally detect the intensity of external light from the second to fourth illuminance sensors S2, S3, and S4 that are not covered. The brightness of the display panel 110a may be adjusted by the second to fourth illuminance sensors S2, S3, and S4 capable of detecting the intensity of external light.

And, as shown in FIG. 4 , the display device 100 includes a display panel 110 , a cover glass 401 disposed on the upper surface of the display panel 110 , and a touch sensor disposed on the rear surface of the display panel 110 . (402), a plurality of illuminance sensors (S1, S2, S3, S4) and the display panel 110, the touch sensor 402, the illuminance sensors (S1, S2, S3, S4) disposed under the touch sensor 402 (S1, S2, S3, S4) It may include a case 403 for accommodating the. In addition, the illuminance sensors S1 , S2 , S3 , and S4 may be disposed to overlap the display area 110a. Here, although the touch sensor 402 is illustrated as being disposed on the rear surface of the display panel 110 , the present invention is not limited thereto, and the touch sensor 402 may be disposed on the upper surface of the display panel 110 .

Since the illuminance sensors S1 , S2 , S3 , and S4 are disposed under the display panel 110 , light emitted in response to an image displayed on the display panel 110 is emitted from the illuminance sensors S1 , S2 , S3 , and S4 . can be projected on Light projected on the illuminance sensors S1 , S2 , S3 , and S4 corresponding to the image displayed on the display panel 110 may be referred to as internal light.

When the internal light is projected on the illuminance sensor S1, S2, S3, S4, the illuminance sensor S1, S2, S3, S4 receives both the internal light and the external light, so the illuminance sensor S1, S2, S3, S4) may cause a problem in that the intensity of external light cannot be accurately detected.

Therefore, the intensity of the internal light may be subtracted from the illuminance data corresponding to the intensity of the external light generated by the illuminance sensors S1, S2, S3, and S4.

FIG. 5 is a structural diagram illustrating an embodiment of the second control circuit shown in FIG. 1 , and FIG. 6 is a graph illustrating illuminance data sensed by a plurality of illuminance sensors.

Referring to FIG. 5 , the second control circuit 160 receives illuminance data for the intensity of external light from the plurality of illuminance sensors S1, S2, S3, and S4, respectively, and the plurality of illuminance sensors S1, S2, S3 , S4) may be used to calculate first intermediate illuminance data, and the brightness of the display panel 110 may be controlled in response to the first intermediate illuminance data.

Also, the second control circuit 160 may include a lookup table 501 . The lookup table 501 may store image signal information on an image signal input to the display panel 110 and information on the intensity of internal light matched with the image signal information. The image signal information matched to the intensity of the internal light is the sum of the grayscales of the image signals included in one frame among the plurality of frames of the image displayed on the display panel 110 , the intensity of the dimming signal, and the image is displayed on the display panel 110 . It may be at least one of a size of a light emitting area and a position within the display panel 110 .

When the second control circuit 160 receives the image signal information for the image signal, it can determine the information on the intensity of the internal light matched with the received image signal information. In addition, the second control circuit 160 corrects the plurality of illuminance data received from the plurality of illuminance sensors S1 , S2 , S3 , and S4 using information on the intensity of internal light, and uses the corrected illuminance data Thus, the first median illuminance data may be calculated.

In addition, the second control circuit 160 excludes illuminance data having an illuminance value smaller than the first intermediate illuminance data among the plurality of illuminance data received from the plurality of illuminance sensors S1, S2, S3, and S4, respectively. The second median illuminance data may be calculated using the remaining illuminance data that has not been completed. In addition, the second control circuit 160 may control the brightness of the display panel 110 in response to the calculated second intermediate illuminance data.

When one of the plurality of illuminance sensors S1, S2, S3, and S4 is covered by the user's body or object, for example, a part of the first illuminance sensor S1 by the object 300 as shown in FIG. 3b When is covered, the first illuminance sensor S1 may have a significantly lower intensity of external light sensed than the other three illuminance sensors S2, S3, and S4.

For example, when the illuminance data detected by the plurality of illuminance sensors S1, S2, S3, and S4 is the same as in FIG. 6 , that is, the illuminance detected by the first illuminance sensor S1 is 100 lx, and the second illuminance sensor (S2) to the illuminance sensed by the fourth illuminance sensor (, S4) may be 750lx, 900lx, 700lx, respectively. In this case, the first intermediate illuminance data of the illuminance data sensed by the first to fourth illuminance sensors S1, S2, S3, S4 selected by the second control circuit 160 is the second illuminance sensor S1, S2, 750 lx detected by S3, S4 and 700 lx detected by the fourth illuminance sensor S1, S2, S3, S4.

And, the second control circuit 160, except for 100lx detected by the first illuminance sensor (S1, S2, S3, S4) lower than the first intermediate illuminance data of 700 lx, the second illuminance sensor (S1, S2, S3) , 750 lx detected by S4), 900 lx detected by the third illuminance sensor (S1, S2, S3, S4), and 700 lx detected by the fourth illuminance sensor (S1, S2, S3, S4) Recalculate the data. That is, the second control circuit 160 sets a median value of 750lx among 750lx, 900lx, and 700lx as the second median illuminance data.

Since the second control circuit 160 calculates the median illuminance data from the remaining illuminance data after excluding illuminance data with a large difference in the above manner, illuminance data detected by the illuminance sensors S1, S2, S3, and S4 The second control circuit 160 can recognize the illuminance data more accurately by reducing the deviation of the deviations.

7 is a flowchart illustrating an algorithm operating in the second control circuit shown in FIG. 5 .

Referring to FIG. 7 , the second control circuit 160 detects image signal information through the image signal RGB, and uses the identified image signal information to match the image signal information in the lookup table 501 inside. Information on the light can be searched (SS1). Then, the second control circuit 160 can determine the intensity of the internal light matched with the image signal from the lookup table 501 (SS2).

In addition, the second control circuit 160 may receive illuminance data from the plurality of illuminance sensors S1, S2, S3, and S4. (SS3) The second control circuit 160 includes the plurality of illuminance sensors S1, The intensity of the internal light may be subtracted from the illuminance data by using the illuminance data received from S2, S3, and S4 and the information about the internal light received from the lookup table 501 . When the intensity of the internal light is subtracted from the illuminance data, the second control circuit 160 may use the image signal information stored in the lookup table 501 and the intensity of the internal light matched to the image signal information.

In addition, the second control circuit 160 may determine the median illuminance data having a median value among the plurality of illuminance data transmitted from the plurality of illuminance sensors S1 , S2 , S3 , and S4 as the intensity of external light. When determining the intensity of external light, it is not limited to only using intermediate illuminance data among illuminance data sensed by the plurality of illuminance sensors S1, S2, S3, and S4, and the intensity of external light is determined by the plurality of illuminance sensors S1, It can be determined using the average illuminance data of a plurality of illuminance data detected in S2, S3, S4).

Then, it may be determined to adjust the brightness of the display panel 110 in response to the determined intensity of external light. (SS4) If the intensity of external light is high, it is determined to increase the brightness of the display panel 110 and the intensity of external light is If it is low, it may be determined to lower the brightness of the display panel 110 .

In addition, the brightness of the display panel 110 may be controlled in response to a result of determining whether to increase or decrease the brightness of the display panel 110 . (SS5) By adjusting the display panel 110 , the display panel 110 may By increasing the visibility of the displayed image and automatically adjusting the brightness, there is an effect of reducing power consumption of the display device 100 .

8 is a conceptual diagram illustrating that an image is displayed in the display device of the present invention.

Referring to FIG. 8 , when the number of pixels arranged in a matrix on the display panel 110 is m*n, when all pixels receive an image signal and emit light, the display panel 110 corresponds to one frame in an image including a plurality of frames. The number of video signals to be used may be m*n.

Also, even if the same number of image signals are supplied, the brightness of the display panel 110 may be different depending on the gray level of the image displayed on the display panel 110 . For the above reasons, a value obtained by adding up image signals corresponding to one frame may be used as image signal information. That is, when the display panel 110 displays a high-gradation image, the sum of the image signals corresponding to one frame is greater than the sum of the image signals when the display panel 110 displays the low-grayscale image. become big Accordingly, the second control circuit 160 may use the sum of the image signals input in one frame as image signal information. In addition, the intensity of the internal light according to the sum of the image signals may be differently matched to the lookup table 501 .

9 is a conceptual diagram illustrating a light emitting area in the display device of the present invention, and FIG. 10 is a conceptual diagram illustrating a position of a light emitting area in the display device of the present invention.

Referring to FIG. 9 , an image may be displayed only in a portion of the display panel 110 . That is, the emission area of the display panel 110 may vary depending on the displayed image. The light emitting area emitted from the display panel 110 may be the first light emitting area (I) or the second light emitting area (II) smaller than the first light emitting area (I) according to a user setting or the size of a displayed image. . Since the first light-emitting area (I) is larger than the second light-emitting area (II), even if the first light-emitting area (I) and the second light-emitting area (II) display an image having the same gradation, the brightness of the display panel 110 is The first light emitting area (I) may be higher than the second light emitting area (II).

That is, the brightness of the display panel 110 may vary according to the emission area of the display panel 110 . Accordingly, the second control circuit 160 may use the size of a light emitting area on which an image is displayed on the display panel 100 as image signal information. In addition, the intensity of the internal light according to the emission area may be differently matched to the lookup table 501 .

Referring to FIG. 10 , when an image is displayed in a partial area of the display panel 110 , only a partial area in which the image is displayed emits light. For example, the image may be displayed at the first position (A) or the second position (B) on the display panel 110 . In addition, the first position (A) may be disposed closer to the driver than the second position (B).

Since the first position (A) is disposed closer to the driver 120a than the second position (B), the length of the data line between the first position (A) and the driver 120 is different from that of the second position (B) and the driver ( 120a) becomes shorter than the length of the data line. The driver 120a may be the data driver 120 illustrated in FIG. 1 or a part thereof. If the length of the data line is long, the resistance is large, and if the length of the data line is short, the resistance is small. Therefore, the voltage drop of the data signal transmitted to the first position (A) is higher than that of the data signal transmitted to the second position (B). becomes smaller

For the same reason as above, when an image is displayed at the first position (A), the luminance of the image displayed at the first position (A) even if the same image signal is supplied to the first position (A) and the second position (B) may be higher than the luminance of the image displayed at the second position (B). Accordingly, the second control circuit 160 may use a position where an image is displayed as image signal information. In addition, the intensity of the internal light according to the position where the image is displayed on the display panel 110 may be matched differently in the lookup table.

11 is a flowchart illustrating a method of driving a display device according to the present invention.

Referring to FIG. 11 , the display device 100 first includes a plurality of illuminance sensors S1 disposed in the display area 110a in the display panel 110 including the display area 110a and the non-display area 110b. Illuminance data corresponding to the intensity of each irradiated light may be supplied from S2, S3, and S4. In addition, since the illuminance sensors S1, S2, S3, and S4 are disposed under the display panel 110, the illuminance sensors S1, S2, S3, and S4 include not only external light but also light from the display panel 110. Internal light generated when displaying an image may also be irradiated.

In addition, the illuminance sensors S1, S2, S3, and S4 can detect both external and internal light, so that the illuminance data generated by the illuminance sensors S1, S2, S3, and S4 is not only the intensity of the external light but also the intensity of the internal light. It can be reflected up to the century. When the intensity of the external light and the intensity of the internal light are varied in the illuminance data, a problem occurs in that the brightness of the display panel 110 is not adjusted according to the surrounding environment.

In order to solve the above problem, the display device 100 calculates the intensity of internal light generated in response to the image displayed on the display panel 110 and the illuminance data detected by the illuminance sensors S1, S2, S3, and S4. By subtracting the intensity of the internal light from , the intensity of the external light can be calculated.

Since the intensity of the internal light corresponds to the intensity of light emitted from the display panel 110 , the intensity of the internal light can be determined using the lookup table 501 matching the intensity of the internal light to the image displayed on the display panel 110 . can

The intensity of the internal light matched to the lookup table 501 is the sum of the grayscales of the image signals included in one frame among the plurality of frames of the image displayed on the display panel 110 , the intensity of the dimming signal, and the image displayed on the display panel 110 . The display may include at least one of the size of the light emitting area and the position of the light emitting area in the display panel. The dimming signal may be a signal for controlling the erection of the display panel 110 according to a user's setting.

In addition, when the display device 100 includes one illuminance sensor, if the illuminance sensor is covered by the user's body or object, the illuminance sensor may not detect the intensity of external light. By using a plurality of illuminance sensors (S1, S2, S3) to solve this problem, even if one illuminance sensor is covered, the intensity of external light can be detected by the other illuminance sensor, so that the intensity of external light can be calculated more accurately. can

In addition, the display device 100 may calculate the first median illuminance data by using the illuminance data supplied from the plurality of illuminance sensors S1, S2, S3, and S4. (S1110) The display device 100 has a plurality of Since the illuminance sensors S1, S2, S3, and S4 of At this time, since at least one of the plurality of illuminance sensors S1, S2, S3, and S4 disposed on the display device 100 may be covered by the user's body or object, the illuminance data transmitted from the obscured illuminance sensor After excluding, the brightness of the display device 100 may be adjusted by calculating a median value from the illuminance data not excluded.

In order to calculate the median value, first, the first median illuminance data may be calculated from all illuminance data supplied from a plurality of illuminance sensors disposed on the display device. In addition, the second intermediate illuminance data may be calculated using the remaining illuminance data except for illuminance data smaller than the first intermediate illuminance data among the plurality of illuminance data received from the plurality of illuminance sensors.

And, the display device 100 may adjust the brightness of the display panel 110. (S1120) The display device 100 may adjust the brightness of the display panel 110 using the first intermediate illuminance data. In order to control the brightness more accurately, the display device 100 may control the brightness of the display panel 110 by using the second intermediate illumination data generated after excluding the illumination data generated by one illumination sensor.

In the above manner, the display device 100 calculates the intensity of external light, and can more accurately control the brightness of the display panel 110 . In addition, even if one illuminance sensor is covered by the user's body or object, the other illuminance sensor can calculate the intensity of external light, so that the brightness of the display panel 110 can be adjusted. In addition, by disposing a plurality of illuminance sensors S1, S2, S3, and S4 at a position overlapping the display panel 110 , a thin bezel can be realized and a plurality of illuminance sensors S1, S2, The brightness of the display panel 110 can be adjusted regardless of the intensity of the internal light irradiated to S3 and S4 .

Although the embodiments of the present specification have been described in more detail with reference to the accompanying drawings, the present specification is not necessarily limited to these embodiments, and various modifications may be made within the scope without departing from the technical spirit of the present specification. . Accordingly, the embodiments disclosed in the present specification are for explanation rather than limiting the technical spirit of the present specification, and the scope of the technical spirit of the present specification is not limited by these embodiments. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The protection scope of the present specification should be construed by the claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present specification.

100: display device
101: pixel
110: display panel
120: data driver
130: gate driver
140: light sensor
150: first control circuit
160: second control circuit

Claims (17)

a display panel including a display area and a non-display area;
a data driver receiving an image signal to generate a data signal and supplying the data signal to the display panel;
a gate driver generating a gate signal and supplying the gate signal to the display panel;
a plurality of illuminance sensors disposed in the display area and configured to sense the intensity of each irradiated light and generate illuminance data;
a first control circuit controlling the data driver and the gate driver, the first control circuit supplying the image signal to the data driver; and
a second control circuit receiving the illuminance data from the plurality of illuminance sensors, calculating first intermediate illuminance data from the illuminance data, and adjusting the brightness of the display panel in response to the first intermediate illuminance data; Including display.
According to claim 1,
The second control circuit,
Among the plurality of illuminance data received from the plurality of illuminance sensors, the second intermediate illuminance data is calculated using the remaining illuminance data that is not excluded except for the illuminance data having a smaller illuminance value than the first intermediate illuminance data,
A display device for adjusting the brightness of the display panel in response to the second intermediate illuminance data.
According to claim 1,
The second control circuit calculates the first median illuminance data by subtracting the intensity of internal light from the illuminance data.
According to claim 1,
The plurality of illuminance sensors are disposed on a rear surface of the display panel,
The light emitted by the image displayed on the display panel includes internal light,
The second control circuit subtracts the intensity of the internal light from the light received by the illuminance sensor and calculates the first median illuminance data.
5. The method of claim 4,
and the second control circuit includes a lookup table in which image signal information on the image signal and information on the intensity of the internal light are matched.
6. The method of claim 5,
The first control circuit further outputs a dimming signal to adjust the brightness of the display panel in response to a user's setting,
The image signal information matched with the intensity of the internal light in the lookup table,
The sum of the grayscales of the image signal included in one frame among the plurality of frames of the image displayed on the display panel, the intensity of the dimming signal, the size of the light emitting area on which the image is displayed on the display panel, and the light emission within the display panel A display device including at least one of the positions of the regions.
According to claim 1,
A display device in which two illuminance sensors among the plurality of illuminance sensors are disposed at positions symmetrical to each other.
a first control circuit for receiving and outputting an image signal; and
Illuminance data corresponding to the intensity of light sensed by the illuminance sensors is received from a plurality of illuminance sensors disposed in the display area of the display panel, respectively, and first intermediate illuminance data is calculated from the illuminance data received from the plurality of illuminance sensors and a second control circuit configured to adjust the brightness of the display panel in response to the first intermediate illuminance data.
9. The method of claim 8,
The second control circuit calculates second intermediate illuminance data using the remaining illuminance data that is not excluded except for illuminance data smaller than the first intermediate illuminance data among the plurality of illuminance data received from the plurality of illuminance sensors, respectively. and a control circuit for adjusting the brightness of the display panel in response to the second intermediate illuminance data.
9. The method of claim 8,
and the second control circuit subtracts the intensity of internal light from the illuminance data and calculates the first intermediate illuminance data.
9. The method of claim 8,
and the second control circuit includes a lookup table in which image signal information on the image signal and information on the intensity of the internal light are matched.
12. The method of claim 11,
The first control circuit further outputs a dimming signal to adjust the brightness of the display panel in response to a user's setting,
The image signal information matched with the intensity of the internal light in the lookup table,
The sum of the grayscales of the image signal included in one frame among the plurality of frames of the image displayed on the display panel, the intensity of the dimming signal, the size of the light emitting area on which the image is displayed on the display panel, and the light emission within the display panel A control circuit comprising at least one of the locations of the regions.
In a display panel including a display area and a non-display area, receiving illuminance data corresponding to the detected light intensity from a plurality of illuminance sensors disposed in the display area;
calculating first intermediate illuminance data using illuminance data supplied from the plurality of illuminance sensors; and
and adjusting the brightness of the display panel in response to the first intermediate illuminance data.
14. The method of claim 13,
The step of adjusting the brightness of the display panel comprises:
Among the plurality of illuminance data received from the plurality of illuminance sensors, the second median illuminance data is calculated using the remaining illuminance data that is not excluded except for illuminance data smaller than the first median illuminance data, and the calculated second median illuminance data is calculated. The method of driving a display device further comprising the step of adjusting the brightness of the display panel in response to the second intermediate illuminance data.
14. The method of claim 13,
The calculating of the first intermediate illuminance data includes subtracting an intensity of internal light from the illuminance data and calculating the first intermediate illuminance data.
16. The method of claim 15,
The calculating of the first median illuminance data may further include determining information on the intensity of the internal light from a lookup table in which image signal information on the image signal and information on the intensity of the internal light are matched. driving method.
17. The method of claim 16,
Further output a dimming signal to adjust the brightness of the display panel in response to the user's setting,
The image signal information matched with the intensity of the internal light in the lookup table,
The sum of the grayscales of the image signal included in one frame among the plurality of frames of the image displayed on the display panel, the intensity of the dimming signal, the size of the light emitting area on which the image is displayed on the display panel, and the light emission within the display panel A method of driving a display device including at least one of positions of regions.

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