KR20190030512A - Display device and driving method thereof - Google Patents

Abstract

The present invention relates to a display device and a driving method thereof, which can improve a three-dimensional effect and liveliness of a sound outputted through a screen of the display device by distributing and arranging speakers in blocks divided in a screen of a display panel, and adjusting the volume of an audio signal inputted to the speakers according to the amount of change in an input image.

Description

DISPLAY DEVICE AND DRIVING METHOD THEREOF [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a display device for varying a volume output through a screen according to a variation amount of an image displayed on a screen and a driving method thereof.

The electronic device may include a display device for reproducing the video signal and an audio output device for reproducing the audio signal. An example of the electronic device is a television (TV), a monitor, and the like.

The electronic device outputs a video signal to a display device to display an image on a screen of the display panel, and outputs an audio signal through a speaker to reproduce the sound signal. The speaker may be implemented with an external speaker system installed outside the electronic device or an internal speaker disposed inside the electronic device. The external speaker system has good sound quality and can produce various sound effects, but there is a limitation in installation space and design, and a disadvantage in cost.

The internal speaker may be located within the electronic device. In the case of an electronic device to which such an internal speaker is applied, the audio signal reproduced by the speaker may be hidden by the display panel or other structures, and sound quality may be deteriorated.

The present invention provides a display device and a method of driving the same, which can improve the volume and soundness of sound by adjusting the volume of the sound signal output through the screen based on the amount of change of the image displayed on the screen.

A display apparatus of the present invention includes a display panel in which a screen on which an input image is displayed is divided into a plurality of blocks, speakers arranged in a distributed manner in the blocks, a controller for analyzing the input image, An image analyzing unit for generating a volume control signal for individually controlling the volume of each of the blocks, and an image analyzing unit for dividing the input audio signal into the blocks and adjusting an audio signal distributed for each block to the volume control signal, And an audio signal processor for outputting the audio signal.

The image analyzing unit may include a data analyzing unit for each block that compares the video signal of the input image with a frame, a data change amount determining unit for each block for determining a data change amount of the video signal for each block, A look-up table for storing in advance a block-by-block data change amount determination unit for receiving a block-by-block data change amount and outputting the weight value, and a controller for separating the volume control signals for each block according to a weight value received from the look- And a block-specific weight generating unit.

The volume control signal includes a volume value proportional to the weight.

The audio signal processing unit may include a channel separator for separating the input audio signal by the number of blocks and outputting a plurality of audio signals before the volume control independently output from the blocks, And outputs an audio signal before the volume control and an audio signal after the volume control through the speakers of each of the blocks in response to the enable signal, And outputs the audio signal as an audio signal.

A method of driving a display device includes dividing a screen displaying an input image on a display panel into a plurality of blocks and arranging speakers on each of the blocks, analyzing the input image, Generating a volume control signal for each block for individually controlling the volume of each block; dividing the input audio signal into the blocks and adjusting an audio signal distributed for each block to a volume control signal for each block, And adjusting the volume of each of the plurality of sound sources according to the amount of data change.

The present invention divides a screen of a display panel into a plurality of blocks in which an audio output is independently controllable and analyzes a variation amount of an image displayed on the screen to greatly control a volume of a block in which an image with a relatively large variation amount is displayed. As a result, the present invention can improve the stereoscopic effect and the liveliness of the sound outputted through the screen of the display device.

1 is a block diagram showing a display device according to an embodiment of the present invention.
2 is a view showing an enable signal and a volume control signal for controlling the speakers.
3 is a flowchart illustrating an audio signal processing method of a display apparatus according to an embodiment of the present invention.
4 is a flowchart illustrating an example of a volume control on a screen according to a variation of a video signal.
5 is a detailed view showing an image analysis unit and an audio signal processing unit.
FIG. 6 is a graph showing a weight according to a data change amount of a video signal.
7 is a view showing a speaker disposed on the display panel.
8 is a detailed view showing the structure of the display panel integrated type speaker.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. It should be noted that the present invention is not limited to the embodiments disclosed below, but may be implemented in various forms. The following embodiments are provided so that the disclosure of the present invention is complete and that those skilled in the art will fully understand the scope of the present invention. The invention is defined by the claims.

The shapes, sizes, ratios, angles, numbers, and the like disclosed in the drawings for describing the embodiments of the present invention are illustrative, and thus the present invention is not limited thereto. Like reference numerals refer to like elements throughout the specification. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

Where the terms "comprises", "having", "done", and the like are used in this specification, other portions may be added unless "only" is used. Unless the context clearly dictates otherwise, including the plural unless the context clearly dictates otherwise.

In interpreting the constituent elements, it is construed to include the error range even if there is no separate description.

In the case of a description of the positional relationship, for example, if the positional relationship between two parts is described as 'on', 'on top', 'under', and 'next to' Or " direct " is not used, one or more other portions may be located between the two portions.

In the description of the embodiments, the first, second, etc. are used to describe various components, but these components are not limited by these terms. These terms are used only to distinguish one component from another.

It is to be understood that each of the features of the various embodiments of the present invention may be combined or combined with each other partially or wholly and technically various interlocking and driving are possible and that the embodiments may be practiced independently of each other, It is possible.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Like reference numerals throughout the specification denote substantially identical components. In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The display device of the present invention can be implemented based on a display device such as a liquid crystal display (LCD), a field emission display (FED), and an electroluminescence display device . The electroluminescence display device can be distinguished as an inorganic light emitting display device and an organic light emitting display device depending on the material of the light emitting layer. The inorganic light emitting display device may be, but not limited to, a quantum dot display device. The display device of the present invention outputs data (hereinafter referred to as "video signal") of an input image and an audio signal on the screen of the display panel. In multimedia content, the audio signal may be synchronized with the video signal.

1 is a block diagram showing a display device according to an embodiment of the present invention. 2 is a view showing an enable signal and a volume control signal for controlling the speakers.

1 and 2, the display apparatus of the present invention includes a display panel 100 for displaying an input image and outputting sound, a display panel driving circuit for writing data of an input image to the display panel 100, An image analyzing unit 200 for analyzing an input image, and an audio signal processing unit 300. Further, the display apparatus of the present invention further includes an enable signal generator 120 for generating an enable signal EN.

The screen (or display area) of the display panel 100 includes a pixel array in which a video signal is displayed. The data lines DL and gate lines (or scan lines, GL) are intersected with the pixel array, and the pixels are arranged in a matrix form. Each of the pixels may be divided into a red subpixel, a green subpixel, and a blue subpixel for color implementation. Each of the pixels may further include a white subpixel.

On the display panel 100, n (n is a positive integer equal to or larger than 2) speakers (SP1 to SP9) are arranged. The speakers SP1 to SP9 are distributed on the display panel 100 in consideration of the position of the object displayed on the screen. The speakers SP1 to SP9 may be coupled to the back surface of the display panel 100 or integrated with the display panel 100, as shown in FIGS.

The screen of the display panel 100 is divided into n blocks BL1 to BL9. The screen of the display panel 100 need not be physically divided. Speakers can be placed in each of the blocks. 1 is an example in which the blocks BL1 to BL9 and the speaker are matched at 1: 1, but the present invention is not limited thereto. A plurality of speakers may be disposed in each of the blocks BL1 to BL9. The audio signal is output independently on a block-by-block basis when the enable signal EN is activated.

The display panel driving circuit writes the data of the input image to the pixels. The display panel drive circuit includes a data driver 102, a gate driver 104, and a timing controller 106.

The data driver 102 receives the video signal received from the timing controller 106. The data driver 102 converts a video signal into a data voltage using a digital to analog converter (DAC) and outputs the data voltage to the data lines DL. The gate driver 104 sequentially supplies gate pulses to the gate lines GL under the control of the timing controller 106. The gate pulse is synchronized to the data voltage to be charged to the pixels. The gate driver 104 may be formed directly on the substrate of the display panel 100 together with the pixel array. In this case, it may be called a gate in panel (GIP).

The timing controller 106 transmits the video data of the input image received from the host system 110 to the data driver 102. The timing controller 106 receives timing signals from the host system 110 in synchronization with the input image data. The timing signals may include a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, a data enable signal DE, and a dot clock DCLK. The timing controller 106 controls the operation timings of the data driver 102 and the gate driver 104 based on the timing signals Vsync, Hsync, DE, and DCLK received together with the pixel data of the input image.

The host system 110 may be any one of a TV system, a set-top box, a navigation system, a DVD player, a Blu-ray player, a personal computer (PC), and a home theater system. The host system may be a mobile device such as a smart phone, a notebook computer, a tablet computer, or a main board of a wearable device.

The host system 110 transmits a video signal and an audio signal to the timing controller 106. The host system 110 may output a video signal combined with an audio signal.

The video analysis unit 200 stores the video signal received from the host system 110 in a frame memory and compares the video signal of the previous frame stored in the frame memory with the video signal of the current frame to analyze a change amount of the video signal. The image analysis unit 200 generates volume control signals CTRL1 to CTRL9 for individually controlling the volume of the speakers SP1 to SP9 by determining the amount of change of the video signal on a block-by-block basis. The video signal analysis method of the image analysis unit 200 may use a MEMC (Motion Estimation / Motion Compensation) algorithm, but is not limited thereto. The volume control signals CTRL1 to CTRL9 generated from the image analysis unit 200 increase the volume of the block in which the motion of the image is great while the volume of the block is relatively small or the motion of the image is relatively small, Thereby enhancing the stereoscopic effect and liveliness of the sound.

The audio signal processing unit 300 distributes the input audio signal received from the host system 110 to blocks on the screen and adjusts the volume of the distributed audio signal to volume control signals CTRL1 to CTRL9, SP9). The audio signal processing unit 300 individually controls the volume of the speakers SP1 to SP9 with the volume control signals CTRL1 to CTRL9 when the enable signal EN is activated, And outputs the distributed audio signals to the speakers SP1 to SP9 when they are inactivated.

The enable signal generator 120 generates an enable signal EN for individually controlling the volume of each of the speakers disposed on the screen. The enable signal EN may be generated as one signal commonly applied to all the speakers SP1 to SP9, or may be generated independently for each speaker in order to separately control each speaker. The enable signal generator 120 generates an enable signal EN (n) according to the control of either the user input connected to the host system 110 or the host system 110, the image analysis unit 200, and the timing controller 106 ). ≪ / RTI >

One or more of the image analysis unit 200 and the enable signal generation unit 120 may be included in the host system 110 or the timing controller 106.

3 is a flowchart illustrating an audio signal processing method of a display apparatus according to an embodiment of the present invention. 4 is a flowchart illustrating an example of a volume control on a screen according to a variation of a video signal.

Referring to FIGS. 3 and 4, the display device receives a video signal and an audio signal, analyzes data of the video signal, and determines a data change amount of the video signal in each of the divided blocks on the screen (S1 and S2). Subsequently, the display device detects a block having a large data change amount and adjusts the volume of the audio signal outputted from the block to relatively larger (S3 and S4). Therefore, as shown in FIG. 4, the volume of the audio signal outputted through the speaker becomes large in a portion where the amount of change of the image displayed on the screen is large.

5 is a detailed block diagram of the image analysis unit 200 and the audio signal processing unit 300. Referring to FIG. FIG. 6 is a graph showing a weight according to a data change amount of a video signal.

5 and 6, the image analysis unit 200 includes a block-by-block data analysis unit, a block-by-block data variation amount determination unit, a look-up table (LUT), and a block-by-block weight determination unit. The block-by-block data analyzer compares the data (DATA) of the video signal between frames, and the block-by-block data variation determination unit determines the variation of the data (DATA) on a block-by-block basis.

The look-up table (LUT) stores a weight (W) according to a data change amount (DELTA DAATA) of a video signal as shown in FIG. The weight W is set to a value that increases in proportion to the data change amount DELTA DATA or increases to a predetermined threshold value TH in proportion to the data change amount DELTA DATA as shown in Figure 6 (B) And can be maintained at the maximum value when the data change amount? DAATA becomes larger than the threshold value TH. 6A shows that the lookup table setting is simple since the weight W for the data change amount DELTA DAA is linearly matched with the offset value and the volume offset for the data change amount DELTA DAATA is set to Can be reliably detected. 6 (B), it is possible to limit the volume offset by setting the threshold value TH to the offset value. The sensitivity to the volume output offset can be reduced when a sudden change in the volume of the output occurs.

The weight W can be set as shown in the curve (C) in Fig. In FIG. 6C, the weight is set so that the minimum value is set to be larger than 0 and is maintained to the first threshold value of the data change amount or becomes large at a low slope, and is relatively high during the interval from the first threshold value TH1 to the second threshold value TH2 It can grow to a slope. The second threshold value TH2 is set to a data change amount higher than the first threshold value TH1. The weight W can be maintained at a maximum value when the data change amount? DAATA becomes larger than the second threshold value TH. 6C, the first and second threshold values TH1 and TH2 may be set to the offset value to reduce the sensitivity to the volume output offset.

The lookup table (LUT) outputs a weight (W) stored at an address indicated by a block-by-block data change amount (ΔDATA) received from a block-by-block data change amount determination unit. Accordingly, when the data change amount DELTA DAATA is calculated for each block, the image analysis unit 200 inputs the data change amount DELTA DAATA to the lookup table LUT, and the lookup table LUT delays the weight W without calculation . Since the amount of data change DELTA DAATA is input to the lookup table LUT in units of blocks, the lookup table (LUT) outputs the weights wobbled on a block-by-block basis.

The image analyzing unit 200 separates the volume control signals CTRL1 to CTRL9 having a volume value proportional to the weight W divided into blocks and outputs the divided volume control signals CTRL1 to CTRL9. The audio signal processing unit 300 receives the volume control signals CTRL1 to CTRL9 and the enable signal EN and outputs the volume control signals CTRL1 to CTRL9 for the speakers when the enable signal EN is activated to the audio signals A1 To A9), the volume is varied according to the amount of change in the image on the screen.

The audio signal processing unit 300 includes a channel separation unit 301, a volume control unit 302, and a channel selection unit 303.

The channel separator 301 separates the input audio signal Asig by the number of divided blocks on the screen, and generates audio signals A1 to A9 for each block independently output in the blocks. The audio signals A1 to A9 are distributed to the speakers A1 to A9.

The volume adjusting unit 302 adjusts the volume of the audio signals A1 to A9 by adding volume control signals CTRL1 to CTRL9 to the audio signals A1 to A9 received from the channel separating unit 301 And outputs the audio signals A1 'to A9'. The first volume control signal CTR1 for controlling the volume of the first block BL1 is added to the first audio signal A1 to be outputted through the first speaker SP1. The second volume control signal CTR2 for controlling the volume of the second block BL2 is added to the second audio signal A2 to be output through the second speaker SP2. The third volume control signal CTR3 for controlling the volume of the third block BL3 is added to the third audio signal A3 to be output through the third speaker SP3. The ninth volume control signal CTR9 for controlling the volume of the ninth block BL9 is added to the ninth audio signal A9 to be output through the ninth speaker SP9.

The channel selection unit 303 selects one of the audio signals A1 to A9 received from the channel separator 301 in each of the blocks and the audio signals A1 to A9 after the volume adjustment received from the volume controller 302, A9 ') according to an enable signal (EN). The enable signal EN may be generated independently on a block-by-block basis or may be generated as a single signal commonly applied to all the blocks. Therefore, the enable signal EN in each of the blocks can select any one of the audio signals A1 to A9 before the volume adjustment and the audio signal after the volume adjustment. The audio signal may be outputted at the volume adjusted by the volume adjusting unit 302 in all the blocks according to the enable signal EN or audio signals A1 'to A9' may be outputted after adjusting the volume only in some blocks. The audio signal selected by the channel selecting unit 303 for each block is output to the speakers SP1 to SP9. The first speaker SP1 vibrates according to the first audio signal received from the channel selector 303 to generate sound in the first block BL1. The second speaker SP2 vibrates according to the second audio signal received from the channel selector 303 to generate sound in the second block BL2. The third speaker SP3 vibrates according to the third audio signal received from the channel selector 303 to generate sound in the third block BL3. Likewise, the ninth speaker SP9 vibrates according to the ninth audio signal received from the channel selection unit 303 to generate sound in the ninth block BL9.

7 is a view showing a speaker disposed on the display panel. 8 is a detailed view showing the structure of the display panel integrated type speaker.

7A is a structure in which a speaker 91 having a general structure is disposed on the back surface of the display panel 100. In FIG. The light of the pixels is emitted through the front surface of the display panel 100 to display the input image. And the diaphragm of the speakers 91 vibrates according to the audio signal to output sound. These speakers 91 are selected as speakers having a structure including an exciter for generating a magnetic force by using magnets and coils and a diaphragm connected to the exciter and disposed on the back surface of the display panel 100 . For example, the exciter may include a magnet on the plate, a center pole on the plate, a bobbin disposed around the center pole, and a coil wound around the bobbin. Further, a structure in which the magnet is disposed outside the coil or a structure in which the magnet is disposed inside the coil can be applied.

The name of the component alone does not define the function or structure. In the case of the above-described excitor, it can be expressed as an actuator or a transducer.

7B shows a structure in which the display panel 100 is integrated with the diaphragm of the speakers. The exciters 92 are directly connected to the display panel 100 at the positions of the speakers. In this case, the display panel 100 serves as a diaphragm of the speaker and can generate sound. Since the display panel 100 can vibrate due to the vibration caused by the magnetic field generated by the exciters 92, the display panel 100 can display the video signal and output the audio signal, Lt; / RTI > The display panel integrated type speaker is described in detail in Korean Patent Registration No. 10-1704517 (2017.02.02), which is filed by the present applicant and patented.

FIG. 8 is a detailed view showing the structure of the display panel integrated speaker shown in FIG. 7 (B).

8, the display panel integrated type speaker includes a support member 94 disposed on the back surface of the display panel 100, exciters 92 fixed to the support member 94, a display panel 100, And an auxiliary support member 95 connecting the support member 94. [

The support member 94 may be made of metal or plastic. The name of the support member 94 may be expressed by another name such as a cover bottom or a back cover. The auxiliary supporting member 95 fixes the supporting member 94 to the display panel 100 with an air gap 96 interposed therebetween.

A plurality of exciters 92 fixed to the support member 94 are brought into contact with the back surface of the display panel 100. Vibrates due to the magnetic force generated from the exciter 92, and sound can be output directly from the display panel 100. [

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

100: display panel 102: data driver
104: Gate driver 106: Timing controller
110: host system 200: image analysis unit
300: audio signal processor 301: channel separator
302: Volume control unit 303: Channel selection unit
BL1 to BL9: Blocks SP1 to SP9 divided on the screen: Speaker
CTRL1 to CTRL9: Volume control signal EN: Enable signal
Asig, A1 to A9, A1 'to A9': audio signals

Claims (6)

A display panel in which a screen on which an input image is displayed is divided into a plurality of blocks;
Speakers distributed on the blocks;
An image analyzer for analyzing the input image to determine a data change amount in each of the blocks and generating a volume control signal for individually controlling the volumes of the blocks; And
And an audio signal processor for distributing the input audio signal to the blocks and adjusting the audio signal distributed for each block to the volume control signal and outputting the adjusted audio signal to the speakers. The method according to claim 1,
Wherein the image analyzing unit comprises:
A block-by-block data analyzer for comparing the video signal of the input image with frames;
A block-by-block data change amount determination unit for determining a data change amount of the video signal for each block;
A lookup table for previously storing a predetermined weight in accordance with the amount of data protection, receiving a block-by-block data change amount input from the block-by-block data change amount determination unit, and outputting the weight value; And
And a block-specific weight generator for separately outputting the volume control signals block by block according to weights received from the look-up table. 3. The method of claim 2,
Wherein the volume control signal includes a volume value proportional to the weight value. The method of claim 3,
The audio signal processor
A channel separator for separating the input audio signal by the number of blocks and outputting a plurality of audio signals before the volume control independently output from the blocks;
A volume controller for adding the volume control signal to the audio signal before the volume control to output an audio signal after adjusting the volume of each block; And
And a channel selector for outputting the audio signal before the volume control and the audio signal after the volume control as an audio signal to be outputted through the speaker of each of the blocks in response to the enable signal. Dividing a screen in which an input image is displayed in a display panel into a plurality of blocks, and arranging speakers in each of the blocks;
Generating a volume control signal for each block for individually controlling a volume of each of the blocks by analyzing the input image to determine a data change amount for each block; And
Dividing an input audio signal into the blocks, and adjusting an audio signal divided for each block to a volume control signal for each block to adjust a volume of each of the blocks according to a data change amount. 6. The method of claim 5,
Further comprising the step of providing a look-up table in which preset weights are previously stored according to the amount of the data,
The step of generating the volume control signal for each block
Inputting the block-by-block data change amount into the lookup table, generating a volume control signal for each block based on the weight output from the lookup table,
Wherein the volume control signal includes a volume value proportional to the weight.

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