Display device

Abstract

A display device is provided. The display device includes pixels disposed in a display area of a display panel, and a display driver that determines whether image data indicates a still image characteristic or a moving image characteristic and controls a supply timing of a data voltage and a pixel driving control signal supplied to the pixels based on a result of the determination, wherein the display driver selectively adjusts a driving frequency for driving the pixels and a level of a high potential voltage supplied to the pixels based on a result of gradation analysis of the image data.

Description

Technical Field

[0001] The present disclosure relates to a display device. Background Art

[0002] As the information society develops, the demand for display devices for displaying images is increasing in various forms. For example, display devices are applied to various electronic devices such as smart phones, digital cameras, notebook computers, navigation devices, and smart TVs.

[0003] The display device may be a flat panel display device such as a liquid crystal display device, a field emission display device, and a light emitting display device. The light emitting display device may include an organic light emitting display device including an organic light emitting element and an inorganic light emitting display device including an inorganic light emitting element such as a quantum dot.

[0004] Specifically, the development of display devices including quantum dots is further progressing, and continuous efforts are being made to improve the image display efficiency and power reduction efficiency of quantum dot display devices. For example, a method is being developed to change the driving frequency of a quantum dot display device by reducing the driving frequency of the quantum dot display device from a high frequency to a low frequency or increasing the driving frequency of the quantum dot display device from a low frequency to a high frequency to reduce the power consumption of the quantum dot display device. Summary of the invention

[0005] Aspects of the present disclosure provide a display device capable of improving power consumption reduction efficiency and product reliability by preventing image display defects due to low-frequency driving.

[0006] Aspects of the present disclosure also provide a display device capable of effectively adjusting an optimal driving frequency, an image display and holding period, and a high-potential driving voltage level according to a result of an analysis of characteristics of a displayed image.

[0007] However, aspects of the present disclosure are not limited to the aspects set forth herein. The above and other aspects of the present disclosure will become more apparent to those of ordinary skill in the art to which the present disclosure relates by referring to the detailed description of the present disclosure given below.

[0008] According to aspects of the present disclosure, a display device is provided, including pixels and a display driver, the pixels being arranged in a display area of ​​a display panel, the display driver determining whether image data indicates still image characteristics or moving image characteristics and controlling a data voltage supplied to the pixels and a supply timing of a pixel drive control signal based on a determination result, wherein the display driver selectively adjusts a driving frequency for driving the pixels and a level of a high potential voltage supplied to the pixels based on a result of a grayscale analysis of the image data.

[0009] In an embodiment, the display driver may determine whether a still image is displayed based on a result of a grayscale analysis of the image data, and in a case where it is determined that the still image is displayed, the pixels are driven by reducing the driving frequency of pixels of each preset block or all pixels and the level of a high potential voltage supplied to the pixels and increasing an image display period during which a data voltage is supplied to the pixels based on the result of the grayscale analysis of the image data.

[0010] In an embodiment, the display driver can determine whether a moving image is displayed based on the results of a grayscale analysis of the image data, and in a case where it is determined that a moving image is displayed, the pixels can be driven by increasing the driving frequency of the pixels of each preset block or all the pixels and the level of the high potential voltage supplied to the pixels and reducing the image display period during which the data voltage is supplied to the pixels based on the results of the grayscale analysis of the image data.

[0011] In an embodiment, the display driver may include: a maximum brightness detection unit, which sorts image data input from the outside in units of at least one frame, and detects a minimum grayscale value and a maximum grayscale value as well as a minimum brightness value and a maximum brightness value of the image data of at least one frame; a load detection unit, which compares and analyzes the grayscale value or brightness value of the image data of at least one frame, and detects load information of pixels of each preset image display block and load information of all pixels of at least one frame; an image analysis unit, which analyzes the grayscale value and brightness value of the image data of at least one frame using a histogram, and detects grayscale distribution information of each preset image display block and grayscale distribution information of at least one frame; and a driving frequency setting unit, which changes and sets the driving frequency of pixels of at least one frame in units of at least one frame period according to a range of a minimum grayscale value and a maximum grayscale value as well as a minimum brightness value and a maximum brightness value of the image data of at least one frame.

[0012] In an embodiment, the display driver may further include a load level setting unit, which analyzes the grayscale display range and brightness display range of each preset image display block or the image data of at least one frame based on the range of the minimum grayscale value and the maximum grayscale value and the minimum brightness value and the maximum brightness value of the image data of at least one frame, and the driving frequency setting unit may change and set the driving frequency of the pixels of at least one frame in units of at least one frame period based on the grayscale display range and the brightness display range of the image data of each preset image display block or at least one frame.

[0013] In an embodiment, the display driver may further include: a block driving frequency setting unit, which changes and sets the driving frequency of the pixels of each preset image display block in units of at least one frame period according to the grayscale distribution information of each preset image display block and the grayscale distribution information of at least one frame; a driving voltage setting unit, which changes and sets the level of the high potential voltage supplied to the pixel in units of at least one frame period according to the range of the minimum grayscale value and the maximum grayscale value and the minimum brightness value and the maximum brightness value of the image data including at least one frame; an image display period setting unit, which changes and sets the supply period of the image data voltage supplied to the pixels of at least one frame in response to the change of the driving frequency of the pixels of at least one frame changed and set in units of at least one frame period; and a panel driving control unit, which changes the supply timing and supply period of the pixel driving control signal and the data voltage supplied to the pixel in response to the change of the driving frequency changed and set in units of at least one frame period.

[0014] In an embodiment, the driving voltage setting part can change and set the level of the high potential voltage supplied to the pixels of each preset image display block according to the range of the minimum grayscale value and the maximum grayscale value and the minimum brightness value and the maximum brightness value of the image data of each preset image display block.

[0015] In an embodiment, the image display period setting unit can change and set the supply period of the image data voltage supplied to the pixels of each preset image display block in units of preset image display blocks in response to changes in the driving frequency of the pixels of each preset image display block that is changed and set in units of at least one frame period.

[0016] In an embodiment, the panel drive control unit can change the supply timing and supply period of the pixel drive control signal and the data voltage supplied sequentially to the pixels of each preset image display block in response to the change of the driving frequency of the pixels of each preset image display block changed and set in units of at least one frame period.

[0017] In an embodiment, the panel drive control unit may change the level of the high potential voltage supplied to the pixel in units of at least one frame period in response to high potential voltage level information of the pixels of at least one frame changed and set in units of at least one frame period, or may change the level of the high potential voltage supplied to the pixels of each preset image display block in units of at least one frame period in response to high potential voltage level information of the pixels of each preset image display block changed and set in units of at least one frame period.

[0018] In an embodiment, the panel drive control unit may supply data voltages to pixels sequentially in units of at least one horizontal line in response to an image data voltage supply period for pixels of at least one frame that is changed and set in units of at least one frame period, or may supply data voltages to pixels sequentially in units of at least one horizontal line in response to an image data voltage supply period for pixels of each preset image display block that is changed and set in units of at least one frame period.

[0019] According to another aspect of the present disclosure, a display device is provided, including pixels and a display driver, the pixels being arranged in a display area of ​​a display panel, the display driver determining whether image data indicates still image characteristics or moving image characteristics and controlling the supply timing of a data voltage supplied to the pixels and a pixel driving control signal based on the determination result, wherein the display driver determines whether a still image is displayed based on a result of a grayscale analysis of the image data, and in a case where it is determined that a still image is displayed, the pixels are driven by reducing a driving frequency of pixels of each preset block or all pixels and a level of a high potential voltage supplied to the pixels and increasing an image display period during which a data voltage is supplied to the pixels, according to the result of the grayscale analysis of the image data.

[0020] In an embodiment, the display driver may include: a maximum brightness detection unit, which sorts image data input from the outside in units of at least one frame, and detects a minimum grayscale value and a maximum grayscale value as well as a minimum brightness value and a maximum brightness value of the image data of at least one frame; a load detection unit, which compares and analyzes the grayscale value or brightness value of the image data of at least one frame, and detects load information of pixels of each preset image display block and load information of all pixels of at least one frame; an image analysis unit, which analyzes the grayscale value and brightness value of the image data of at least one frame using a histogram, and detects grayscale distribution information of each preset image display block and grayscale distribution information of at least one frame; and a driving frequency setting unit, which changes and sets the driving frequency of pixels of at least one frame in units of at least one frame period according to a range of a minimum grayscale value and a maximum grayscale value as well as a minimum brightness value and a maximum brightness value of the image data of at least one frame.

[0021] In an embodiment, the display driver may further include a load level setting unit, which analyzes the grayscale display range and brightness display range of each preset image display block or the image data of at least one frame based on the range of the minimum grayscale value and the maximum grayscale value and the minimum brightness value and the maximum brightness value of the image data of at least one frame, and the driving frequency setting unit may change and set the driving frequency of the pixels of at least one frame in units of at least one frame period based on the grayscale display range and the brightness display range of the image data of each preset image display block or at least one frame.

[0022] In an embodiment, the display driver may further include: a block driving frequency setting section, which changes and sets the driving frequency of the pixels of each preset image display block in units of at least one frame period according to the grayscale distribution information of each preset image display block and the grayscale distribution information of at least one frame; a driving voltage setting section, which changes and sets the level of the high potential voltage supplied to the pixel in units of at least one frame period according to the range of the minimum grayscale value and the maximum grayscale value and the minimum brightness value and the maximum brightness value of the image data including each preset image display block or at least one frame; an image display period setting section, which changes and sets the supply period of the image data voltage supplied to the pixels of at least one frame in response to the change of the driving frequency of the pixels of at least one frame changed and set in units of at least one frame period; and a panel driving control section, which changes the supply timing and supply period of the pixel driving control signal and the data voltage supplied to the pixel in response to the change of the driving frequency changed and set in units of at least one frame period.

[0023] In an embodiment, the image display period setting unit can change and set the supply period of the image data voltage supplied to the pixels of each preset image display block in units of preset image display blocks in response to changes in the driving frequency of the pixels of each preset image display block that is changed and set in units of at least one frame period.

[0024] In an embodiment, the panel drive control unit can change the supply timing and supply period of the pixel drive control signal and the data voltage supplied sequentially to the pixels of each preset image display block in response to the change of the driving frequency of the pixels of each preset image display block changed and set in units of at least one frame period.

[0025] In an embodiment, the panel drive control unit may change the level of the high potential voltage supplied to the pixel in units of at least one frame period in response to high potential voltage level information of the pixels of at least one frame changed and set in units of at least one frame period, or may change the level of the high potential voltage supplied to the pixels of each preset image display block in units of at least one frame period in response to high potential voltage level information of the pixels of each preset image display block changed and set in units of at least one frame period.

[0026] In an embodiment, the panel drive control unit may supply data voltages to pixels sequentially in units of at least one horizontal line in response to an image data voltage supply period for pixels of at least one frame that is changed and set in units of at least one frame period, or may supply data voltages to pixels sequentially in units of at least one horizontal line in response to an image data voltage supply period for pixels of each preset image display block that is changed and set in units of at least one frame period.

[0027] According to another aspect of the present disclosure, a display device is provided, including pixels and a display driver, the pixels being arranged in a display area of ​​a display panel, the display driver determining whether image data indicates still image characteristics or moving image characteristics and controlling the supply timing of a data voltage supplied to the pixels and a pixel drive control signal based on the determination result, wherein the display driver can determine whether a moving image is displayed based on a result of a grayscale analysis of the image data, and in the case of determining that a moving image is displayed, the pixels can be driven by increasing a driving frequency of pixels of each preset block or all pixels and a level of a high potential voltage supplied to the pixels and reducing an image display period during which a data voltage is supplied to the pixels based on the result of the grayscale analysis of the image data.

[0028] The display device according to the embodiment can prevent image display defects such as brightness reduction and flicker caused by low-frequency driving, thereby maintaining or improving image display quality even during a period of reduced power consumption.

[0029] It is capable of improving power consumption reduction efficiency and product reliability by effectively adjusting the optimal driving frequency, image display and retention period, and high-potential driving voltage level based on the results of analysis of characteristics such as display image grayscale distribution, load of each display area, maximum brightness value and grayscale value.

[0030] However, the effects of the present disclosure are not limited to the effects set forth herein. The above and other effects of the present disclosure will become more apparent to those skilled in the art by referring to the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] These and / or other aspects will become apparent and more easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0032] Figure 1 is a schematic perspective view of a display device according to an embodiment;

[0033] Figure 2 is a schematic plan view of a display device according to an embodiment;

[0034] Figure 3 It is taken along line I-I' Figure 2 A schematic cross-sectional view of a display panel;

[0035] Figure 4 yes Figure 2 A schematic enlarged plan view of area "A" in FIG.

[0036] Figure 5 yes Figure 2 A block diagram of a display driver shown in ;

[0037] Figure 6 shows an image of the first embodiment displayed in a display area of ​​a display panel;

[0038] Figure 7 It is a graphic Figure 6 A graph of the results of a histogram analysis of the image shown in;

[0039] FIG. 8A to FIG. 8C It is a diagram to detect each preset block area Figure 6 Schematic diagram of the results of the loading of red pixels, green pixels and blue pixels of the image shown in;

[0040] 9A to 9D It is a graphic representation of the calculation of each preset block area. Figure 6 Schematic diagram of the results of optimal frequencies of red pixels, green pixels and blue pixels of the image shown in;

[0041] Fig.10 shows an image of the second embodiment displayed in a display area of ​​a display panel;

[0042] Fig.11 It is a graphic Fig.10 A graph of the results of a histogram analysis of the image shown in;

[0043] FIG. 12A to FIG. 12C It is a diagram to detect each preset block area Fig.10 Schematic diagram of the results of the loading of red pixels, green pixels and blue pixels of the image shown in;

[0044] FIG. 13A to FIG. 13D It is a graphic representation of the calculation of each preset block area. Fig.10 Schematic diagram of the results of optimal frequencies of red pixels, green pixels and blue pixels of the image shown in;

[0045] Fig.14 shows an image of the third embodiment displayed in a display area of ​​a display panel;

[0046] Fig.15 It is a graphic Fig.14 A graph of the results of a histogram analysis of the image shown in;

[0047] FIG. 16A to FIG. 16C It is a diagram to detect each preset block area Fig.14 Schematic diagram of the results of the loading of red pixels, green pixels and blue pixels of the image shown in;

[0048] FIG. 17A to FIG. 17D It is a graphic representation of the calculation of each preset block area. Fig.14 Schematic diagram of the results of optimal frequencies of red pixels, green pixels and blue pixels of the image shown in;

[0049] Fig.18 and Fig.19 is a schematic perspective view of a quantum dot display device including a quantum dot light emitting layer according to an embodiment;

[0050] Fig. 20 and Fig.21 is a schematic perspective view of a quantum dot display device according to an embodiment of the present disclosure;

[0051] Fig. 22 is a schematic perspective view of a rollable quantum dot display device according to an embodiment of the present disclosure; and

[0052] Fig.23 is a schematic perspective view of a rollable quantum dot display device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0053] The present disclosure will now be described more fully below with reference to the accompanying drawings, in which embodiments of the present disclosure are shown. However, the present disclosure may be embodied in different forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure will be more detailed and comprehensive, and will convey the scope of the present disclosure to those skilled in the art.

[0054] It will also be understood that when a layer is referred to as being “on” another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may also be present. Throughout the specification, the same reference numerals refer to the same components.

[0055] It will be understood that although the terms "first", "second", etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, the first element discussed below may be referred to as the second element without departing from the teachings of the present disclosure. Similarly, the second element may also be referred to as the first element.

[0056] Each of the features of the various embodiments of the present disclosure can be combined or combined with each other partially or as a whole, and various interlocks and drives are technically possible. Each embodiment can be implemented independently of each other, or can be implemented together in association.

[0057] The terms "about" or "approximately" as used herein include the stated value and mean within an acceptable range of deviation for a particular value as determined by one of ordinary skill in the art, taking into account the measurement in question and the errors associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "about" can mean within one or more standard deviations, or within ±30%, ±20%, ±10%, ±5% of the stated value.

[0058] The term "and / or" includes all combinations of one or more that the associated configurations may define. For example, "A and / or B" may be understood to mean "A, B, or A and B".

[0059] For the purpose of the present disclosure, the phrase “at least one of A and B” may be interpreted as only A, only B, or any combination of A and B. In addition, “at least one of X, Y, and Z” and “at least one selected from the group consisting of X, Y, and Z” may be interpreted as only X, only Y, only Z, or any combination of two or more of X, Y, and Z.

[0060] Unless otherwise defined or implied herein, all terms (including technical and scientific terms) used herein have the same meaning as those commonly understood by those skilled in the art to which the present disclosure belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an idealized or overly formal sense unless explicitly so defined herein.

[0061] Hereinafter, embodiments will be described with reference to the accompanying drawings.

[0062] Figure 1 is a schematic perspective view of a display device 1 according to the embodiment. Figure 2 is a schematic plan view of a display device 1 according to the embodiment.

[0063] refer to Figure 1, the display device 1 may display a moving image or a still image. The display device 1 may refer to any electronic device that provides a display screen. Examples of the display device 1 may include a television, a laptop computer, a monitor, a billboard, an Internet of Things (IoT) device, a mobile phone, a smart phone, a tablet personal computer (PC), an electronic watch, a smart watch, a watch phone, a head-mounted display, a mobile communication terminal, an electronic notepad, an e-book reader, a portable multimedia player (PMP), a navigation device, a game console, a digital camera, and a camcorder, all of which provide a display screen.

[0064] The display device 1 may be an inorganic light emitting diode display device, an organic light emitting display device, a quantum dot light emitting display device, a plasma display device, or a field emission display device. The following will describe a case where an organic light emitting diode display device is applied as an example of the display device 1, but the present disclosure is not limited to this case, and other display devices can also be applied as long as the same technical spirit is applicable.

[0065] The shapes of the display device 1 and the display panel 100 may be variously modified. For example, the display device 1 may have various shapes such as a horizontally long rectangle, a vertically long rectangle, a square, a quadrilateral with rounded corner inflection points (vertices), other polygons, and a circle. The shape of the display area DA of the display panel 100 may also be similar to the overall shape of the display device 1. Figure 1 In the embodiment, the display device 1 may be shaped like a rectangle that is long in the second direction Y, but the present disclosure is not limited thereto.

[0066] refer to Figure 1 and Figure 2 , the display device 1 may include a display panel 100 , a display driver 200 and a circuit board 300 .

[0067] The display panel 100 may be shaped like a rectangular plane having a short side in a first direction (X-axis direction) and a long side in a second direction (Y-axis direction). Each corner where the short side extending in the first direction (X-axis direction) meets the long side extending in the second direction (Y-axis direction) may be rounded with a curvature (e.g., a predetermined or selectable curvature), or may be at right angles. The planar shape of the display panel 100 is not limited to a quadrilateral shape, and may also be other polygonal shapes, circular shapes, or elliptical shapes. The display device 1 and the display panel 100 may be formed to be flat, but the present disclosure is not limited thereto. The display device 1 and the display panel 100 may also include a curved portion formed at its left and right ends and having a constant or variable curvature. The display device 1 and the display panel 100 may be formed to be flexible so that they can be bent, curved, folded, or curled.

[0068] The display panel 100 may include a display area DA, a non-display area NDA, and a pad area PDA.

[0069] The display area DA of the display panel 100 may generally occupy the center of the display device 1. The pixels PX may be arranged in the display area DA. Each of the pixels PX may be defined as a minimum unit that emits light. The pixels PX may be electrically connected to a signal line located in the non-display area NDA. The display area DA may emit light from an emission area or an opening included in the pixel PX.

[0070] The non-display area NDA may be an area outside the display area DA. The non-display area NDA may be an area outside the edge of the display area DA, and may be an area surrounding the display area DA. The non-display area NDA may include a gate driver (not shown) that supplies a gate signal to a gate line, and a fan-out line (not shown) that electrically connects the display driver 200 and the display area DA.

[0071] The display driver 200 may output signals and voltages for driving the display panel 100. Specifically, the display driver 200 may output signals and voltages for driving the pixels PX arranged in the display area DA. The display driver 200 may supply data voltages to data lines of the display panel 100. The display driver 200 may supply power supply voltages to power lines and supply gate control signals to gate drivers of the display panel 100.

[0072] The display driver 200 can selectively adjust the driving frequency used to drive the pixels PX of the display panel 100, the level of the high potential voltage supplied to the pixels PX, and the image display period (effective period) of at least one frame based on the characteristics of the image displayed on the display panel 100 and the results of the analysis of the image data.

[0073] Specifically, the display driver 200 may adjust the power consumption of the display panel 100 according to the characteristics of the image displayed on the display panel 100 (e.g., the display characteristics of a still image, a moving image, or a repeated image). For example, the display driver 200 may reduce the power consumption of the display panel 100 according to the still image or repeated image characteristics. To this end, the display driver 200 may analyze the characteristics of the image (e.g., image data) displayed on the display panel 100, and may selectively adjust the driving frequency for driving the pixel PX of the display panel 100, the level of the high potential voltage supplied to the pixel PX, and the image display period (effective period) of at least one frame according to the analysis result. The display driver 200 may determine that a still image or a repeated image is displayed on the display panel 100 based on the result of the analysis of the image data. In the case of displaying a still image or a repeated image, the display driver 200 may drive the pixel PX by reducing the driving frequency of the pixel PX and the level of the high potential voltage supplied to the pixel PX and increasing the image display period of at least one frame according to the result of the analysis of the image data. In contrast, in the case of displaying a moving image, the display driver 200 may drive the pixel PX by increasing the driving frequency of the pixel PX and the level of the high potential voltage supplied to the pixel PX and reducing the image display period of at least one frame according to the result of the analysis of the image data.

[0074] The circuit board 300 may be attached to the pad portion of the display panel 100 using an anisotropic conductive film (ACF). The leads of the circuit board 300 may be electrically connected to the pad portion of the display panel 100. The circuit board 300 may be a flexible printed circuit board, a rigid printed circuit board, or a flexible film such as a chip on film. The display driver 200 may be formed as an integrated circuit and mounted on the display panel 100 using, for example, a chip on glass (COG) method, a chip on plastic (COP) method, or an ultrasonic bonding method. The display driver 200 may be formed as an integrated circuit and mounted on the circuit board 300 using, for example, a COG method, a COP method, or an ultrasonic bonding method. As another example, the display driver 200 may be mounted on the display panel 100 using, for example, a COG method, a COP method, or an ultrasonic bonding method.

[0075] The display pads PD may be arranged in the pad area PDA of the display panel 100. The display pads PD may be arranged at the edge of the pad area PDA. The display pads PD may be electrically connected to the graphics system through the circuit board 300. The display pads PD may be electrically connected to the circuit board 300 to receive digital video data, and the digital video data may be supplied to the display driver 200.

[0076] Figure 3 It is taken along line I-I' Figure 2 Schematic cross-sectional view of a display panel 100 .

[0077] refer to Figure 3 In the schematic stacked structure of the display device 1, the display device 1 may include a first substrate 10, a second substrate 30 facing the first substrate 10, and a sealing portion 50 that bonds the first substrate 10 and the second substrate 30 together. The first substrate 10 may include a first base substrate 110 and a light emitting element layer 150, and the second substrate 30 may include a second base substrate 310 and a hydrogen donor layer 330.

[0078] The first base substrate 110 may be a base substrate or a base member. The first base substrate 110 may be a flexible substrate that can be bent, folded, or curled. For example, the first base substrate 110 may include a polymer resin such as polyimide (PI), but the present disclosure is not limited thereto. As another example, the first base substrate 110 may include a glass material or a metal material.

[0079] The light emitting element layer 150 may include a pixel circuit including a switching element, a pixel defining layer defining an emission area or an opening area, and a self-luminous element. For example, each of the self-luminous elements may include, but is not limited to, at least one of an organic light emitting diode including an organic light emitting layer, a quantum dot light emitting diode including a quantum dot light emitting layer, an inorganic light emitting diode including an inorganic semiconductor, and a micro light emitting diode.

[0080] The second base substrate 310 may be made of (or include) various materials such as glass materials, metal materials, or plastic materials (such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), or polyimide). The second base substrate 310 may include ultra-thin glass (UTG) having a thickness of about 0.01 mm or less. The second base substrate 310 may prevent impurities such as moisture or air from penetrating and diffusing from the outside into the light emitting element layer 150 of the first base substrate 110.

[0081] The hydrogen donor layer 330 may be formed on the second base substrate 310. The hydrogen donor layer 330 may be deposited on the second base substrate 310 and bonded to the first base substrate 110 through the sealing portion 50 through a subsequent process. Thus, the hydrogen donor layer 330 may be located between the first base substrate 110 and the second base substrate 310. The hydrogen donor layer 330 may face the light emitting element layer 150 and overlap with the light emitting element layer 150.

[0082] The hydrogen donor layer 330 may be an inorganic layer including, for example, silicon. For example, the hydrogen donor layer 330 may include silicon oxide (SiO 2 ), silicon nitride (Si 3 N 4 ) or silicon oxynitride (Si 2 N 2O).

[0083] The sealing portion 50 may overlap the non-display area NDA and may be arranged along the edges of the first base substrate 110 and the second base substrate 310 to surround the display area DA in a plan view. The first base substrate 110 and the second base substrate 310 may be bonded to each other through the sealing portion 50. The sealing portion 50 may prevent impurities such as moisture or air from penetrating and diffusing from the outside into the light emitting element layer 150 of the first substrate 10. For example, the sealing portion 50 may include an epoxy-based organic material and a glass-based inorganic material.

[0084] Figure 4 yes Figure 2 Schematic enlarged plan view of area "A" in FIG.

[0085] refer to Figure 4 , the display device 1 may include emission areas EA1 to EA3 arranged in the display area DA. The emission areas EA1 to EA3 may include a first emission area EA1, a second emission area EA2, and a third emission area EA3 that emit light of different colors. Each of the emission areas EA1 to EA3 may emit red light, green light, or blue light, and the color of the light emitted from each of the emission areas EA1 to EA3 may change according to the type of light emitting element arranged in the light emitting element layer of the emission area EA1, EA2, or EA3. In an embodiment, the first emission area EA1 may emit a red first light, the second emission area EA2 may emit a green second light, and the third emission area EA3 may emit a blue third light.

[0086] The non-emission area BA may be an area surrounding each of the emission areas EA1 to EA3. The non-emission area BA may be an area through which light does not pass, but the present disclosure is not limited thereto. Depending on the material contained in the pixel defining layer, light may or may not pass through the non-emission area BA.

[0087] In some embodiments, the display device 1 may include spaces SA surrounding the emission areas EA1 to EA3, respectively. The spaces SA may be generated by bonding the first base substrate 110 and the second base substrate 310. Each of the spaces SA may be filled with nitrogen (N 2 ) or air. The space SA will be described in detail below.

[0088] In some embodiments, the hydrogen donor layer 330 may cover (or overlap) all of the emission areas EA1 to EA3 , the space SA, and the non-emission area BA.

[0089] Figure 5 yes Figure 2 A schematic detailed block diagram of the display driver 200 is shown in FIG.

[0090] refer to Figure 5 The display driver 200 of the embodiment may include a maximum brightness detection unit 201, a load detection unit 202, an image analysis unit 207, a load level setting unit 203, a driving frequency setting unit 204, a driving voltage setting unit 205, an image display period setting unit 206, a block driving frequency setting unit 208 and a panel driving control unit 209.

[0091] The maximum brightness detection unit 201 can sort the image data RGB Data input from the outside in units of at least one frame, and can detect the minimum grayscale value and maximum grayscale value and the minimum brightness value and maximum brightness value of the image data of at least one frame. Specifically, the maximum brightness detection unit 201 can sequentially compare and analyze the grayscale value and brightness value of the pixel PX contained in the image data of at least one frame, and can detect the maximum grayscale value and maximum brightness value of each frame or at least one frame. The maximum brightness detection unit 201 can send the maximum grayscale data and maximum brightness data M_YData including the detected maximum grayscale value to the load level setting unit 203.

[0092] The maximum brightness detection part 201 may divide the image data RGB Data inputted from the outside into preset block areas for each frame, and may detect the minimum and maximum grayscale values ​​and the minimum and maximum brightness values ​​of the image data of each block area.

[0093] The load detection unit 202 can compare and analyze the grayscale value or brightness value of the image data of at least one frame, and can detect the load information of the pixel PX of each preset image display block and the load information of all pixels PX of at least one frame. Specifically, the load detection unit 202 can detect and analyze the maximum grayscale value, the maximum brightness value, the average grayscale value or the average brightness value from the grayscale value and the brightness value of the pixel PX contained in the image data of at least one frame. The load detection unit 202 can calculate or detect the load on at least one pixel PX or all pixels PX based on the maximum grayscale value, the maximum brightness value, the average grayscale value or the average brightness value of the image data of at least one frame. The load detection unit 202 can calculate the load using a preset load detection formula, or can detect the load from a database (such as a lookup table) pre-stored in a memory using an experimental value. The load detection unit 202 can send the load data L_Data including the load calculation result value to the driving frequency setting unit 204 and the load level setting unit 203. The load detection unit 202 can supply the detected maximum grayscale value, maximum brightness value, average grayscale value or average brightness value to the image analysis unit 207, the load level setting unit 203, the driving frequency setting unit 204, the driving voltage setting unit 205, the image display period setting unit 206 and the block driving frequency setting unit 208.

[0094] The image analysis unit 207 can analyze the grayscale value and brightness value of the image data of at least one frame using a histogram, and can detect the grayscale distribution information of each preset image display block and the grayscale distribution information of at least one frame. The image analysis unit 207 can compare the grayscale distribution information of each preset image display block and the grayscale distribution information of at least one frame with the grayscale distribution information of at least one previous frame in sequence, and can detect the still image or moving image characteristics of the image data RGB Data input from the outside based on the comparison analysis result. The image analysis unit 207 can supply the grayscale distribution information of each image display block and the grayscale distribution information H_Data of at least one frame to the driving frequency setting unit 204, the driving voltage setting unit 205, the image display period setting unit 206 and the block driving frequency setting unit 208.

[0095] The load level setting unit 203 may analyze the grayscale display range and the brightness display range of each preset image display block or the image data of at least one frame according to the range of the minimum grayscale value and the maximum grayscale value and the minimum brightness value and the maximum brightness value of the image data of at least one frame.

[0096] The driving frequency setting section 204 may change and set the driving frequency of the pixels PX of at least one frame in units of at least one frame period according to the range of the minimum grayscale value and the maximum grayscale value and the minimum brightness value and the maximum brightness value of the image data of at least one frame. As another example, the driving frequency setting section 204 may change and set the driving frequency of the pixels PX of at least one frame in units of at least one frame period according to the grayscale display range and the brightness display range of the image data of each preset image display block or at least one frame.

[0097] The block driving frequency setting part 208 may change and set the driving frequency of the pixels PX of each preset image display block in units of at least one frame period according to the grayscale distribution information of each preset image display block and the grayscale distribution information of at least one frame.

[0098] The driving voltage setting section 205 may change and set the level of the high potential driving voltage supplied to the pixel PX of at least one frame in units of at least one frame period according to the range of the minimum grayscale value and the maximum grayscale value and the minimum brightness value and the maximum brightness value of the image data including at least one frame. The driving voltage setting section 205 may change and set the level of the high potential driving voltage supplied to the pixel PX of each preset image display block according to the range of the minimum grayscale value and the maximum grayscale value and the minimum brightness value and the maximum brightness value of the image data including each preset image display block.

[0099] The image display period setting section 206 may change and set the period during which the image data voltage is supplied to the pixels PX of at least one frame (e.g., the image data writing and display period of the pixels PX of at least one frame) in response to the change in the driving frequency of the pixels PX of at least one frame that is changed and set in units of at least one frame period. As the period during which the image data voltage is supplied (e.g., the image data writing and display period) increases, the period during which the displayed image is maintained may decrease. Conversely, as the image data writing and display period decreases, the period during which the displayed image is maintained may increase.

[0100] The image display period setting section 206 can change and set the period for supplying the image data voltage to the pixels PX of each preset image display block in units of preset image display blocks in response to the change in the driving frequency of the pixels PX of each preset image display block that is changed and set in units of at least one frame period. Similarly, as the period for supplying the image data voltage (e.g., the image data writing and display period) increases, the period during which the displayed image is maintained can be reduced. Conversely, as the image data writing and display period decreases, the period during which the displayed image is maintained can be increased.

[0101] The panel drive control section 209 may change the supply timing and supply period of the pixel drive control signals (e.g., scan signals, emission control signals, and reset signals) and the data voltages sequentially supplied to the pixels PX of at least one horizontal line in response to the change of the drive frequency of the pixels PX of at least one frame changed and set in units of at least one frame period. The panel drive control section 209 may change the supply timing and supply period of the pixel drive control signals (e.g., scan signals, emission control signals, and reset signals) and the data voltages sequentially supplied to the pixels PX of each preset image display block in response to the change of the drive frequency of the pixels PX of each preset image display block changed and set in units of at least one frame period.

[0102] The panel drive control section 209 may change the level of the high potential driving voltage supplied to the pixel PX in units of at least one frame period in response to the high potential driving voltage level information of the pixel PX of at least one frame changed and set in units of at least one frame period. The panel drive control section 209 may change the level of the high potential driving voltage supplied to the pixel PX of each preset image display block in response to the high potential driving voltage level information of the pixel PX of each preset image display block changed and set in units of at least one frame period.

[0103] The panel driving control section 209 may sequentially supply the data voltage D_Data to the pixels PX in units of at least one horizontal line in response to the image data voltage supply period of the pixels PX of at least one frame changed and set in units of at least one frame period. The panel driving control section 209 may sequentially supply the data voltage D_Data to the pixels PX in units of at least one horizontal line in response to the image data voltage supply period of the pixels PX of each preset image display block changed and set in units of at least one frame period.

[0104] Figure 6 An image of the first embodiment displayed in the display area DA of the display panel 100 is illustrated. Figure 7 It is a graphic Figure 6 Schematic diagram of the results of histogram analysis of the images shown in the table.

[0105] refer to Figure 6 and Figure 7 The image analysis unit 207 may analyze the grayscale value and the brightness value of the image data of at least one frame using a histogram, and may detect the grayscale distribution information of each preset image display block and the grayscale distribution information of at least one frame.

[0106] The image analysis unit 207 may classify the image data of at least one frame into red data, green data, and blue data, and may analyze and display the amount of each of the red data, green data, and blue data and the ratio of each of the red data, green data, and blue data based on each preset gray value using a histogram. The image analysis unit 207 may analyze the amount of each of the red data, green data, and blue data and the ratio of each of the red data, green data, and blue data based on each preset brightness value using a histogram.

[0107] The image analyzing part 207 may detect grayscale distribution information of each of red data, green data, and blue data of at least one frame or each preset image display area or image display block.

[0108] FIG. 8A to FIG. 8C It is a diagram to detect each preset block area Figure 6 Schematic diagram of the results of the loading of red pixels, green pixels and blue pixels of the image shown in .

[0109] Specifically, Fig. 8A is a schematic diagram illustrating a load detection result according to a grayscale value of red image data of each preset block area. Figure 8B is a schematic diagram illustrating a load detection result according to a grayscale value of green image data of each preset block area. Figure 8C is a schematic diagram illustrating a load detection result according to a grayscale value of blue image data of each preset block area.

[0110] refer to FIG. 8A to FIG. 8C The load detection unit 202 can compare and analyze the grayscale values ​​or brightness values ​​of the red image data, the green image data, and the blue image data of at least one frame, and can detect the load information of the red pixels PX, the green pixels PX, and the blue pixels PX of each preset image display block. Here, the load detection unit 202 can detect the load information of all the red pixels PX, the green pixels PX, and the blue pixels PX of at least one frame, or can detect the load information of all the red pixels PX, the green pixels PX, and the blue pixels PX of each preset block area.

[0111] The load detection unit 202 can detect and analyze the maximum grayscale value, the maximum brightness value, the average grayscale value or the average brightness value from the grayscale values ​​and brightness values ​​of the red pixels PX, the green pixels PX and the blue pixels PX contained in the image data of at least one frame. The load detection unit 202 can calculate or detect the load on each block area or all pixels PX based on the maximum grayscale value, the maximum brightness value, the average grayscale value or the average brightness value of the image data of at least one frame. The load detection unit 202 can calculate the load using a preset load detection formula, or can detect or derive the load of the red pixels, green pixels and blue pixels of each block area from a database (such as a lookup table) pre-stored in a memory using experimental values. The load can be derived as a value that decreases to about 0 toward black and increases to about 10 or about 100 toward white.

[0112] 9A to 9D It is a graphic representation of the calculation of each preset block area. Figure 6 Schematic diagram of the results of optimal frequencies for red pixels, green pixels, and blue pixels of the image shown in .

[0113] Specifically, Fig.9A is a schematic diagram illustrating a driving frequency detection result according to a load detection result of red image data of each preset block area. Fig. 9B is a schematic diagram illustrating a driving frequency detection result according to a load detection result of green image data of each preset block area. Fig. 9C is a diagram illustrating a driving frequency detection result according to a load detection result of blue image data of each preset block area. Fig.9D is a schematic diagram illustrating a result of detecting a driving frequency matched with a load corresponding to a brightness value of each preset block area.

[0114] The driving frequency setting section 204 or the block driving frequency setting section 208 can change and set the driving frequency of the pixels PX of at least one frame in units of at least one frame period according to the grayscale display range and brightness display range of each preset image display block or image data of at least one frame.

[0115] The driving frequency setting section 204 or the block driving frequency setting section 208 may calculate the driving frequency using a preset frequency detection formula, or may detect or derive the driving frequencies of the red pixel PX, the green pixel PX, and the blue pixel PX of each block region from a database (such as a lookup table) stored or pre-stored in a memory using experimental values ​​as shown in the following Table 1. The driving frequency may be derived as a value that decreases to about 0.1 Hz toward black and increases to about 60 Hz or about 120 Hz toward white.

[0116] [Table 1]

[0117]

[0118] The driving voltage setting section 205 may change and set the level of the high potential driving voltage supplied to the pixel PX of each preset image display block according to the range of the minimum grayscale value and the maximum grayscale value and the minimum brightness value and the maximum brightness value of the image data including each preset image display block. The driving voltage setting section 205 may calculate the level of the high potential driving voltage using a preset driving voltage detection formula, or as shown in Table 2 below, may detect or derive the level of the high potential driving voltage applied to the pixel PX of each block area from a database (such as a lookup table) pre-stored in a memory using experimental values.

[0119] [Table 2]

[0120]

[0121] The image display period setting unit 206 can change and set the period in which the image data voltage is supplied to the pixels PX of at least one frame (for example, the image data writing and display period of the pixels PX of at least one frame) in response to the change in the driving frequency of the pixels PX of at least one frame that is changed and set in units of at least one frame period.

[0122] The image display period setting unit 206 can use a preset timing detection formula to calculate the image data writing period (effective time (ms)), or as shown in Table 3 below, can use experimental values ​​to detect or derive the image data writing period (effective time (ms)) information of the pixel PX of each block area from a database (such as a lookup table) pre-stored in the memory.

[0123] [Table 3]

[0124]

[0125] Fig.10 An image of the second embodiment displayed in the display area DA of the display panel 100 is illustrated. Fig.11 It is a graphic Fig.10 Schematic diagram of the results of histogram analysis of the images shown in the table.

[0126] refer to Fig.10 and Fig.11 The image analysis unit 207 can classify the image data of at least one frame into red data, green data and blue data, and can use a histogram to analyze and display the amount of each of the red data, green data and blue data and the proportion of each of the red data, green data and blue data based on each preset grayscale value.

[0127] The image analysis unit 207 may detect grayscale distribution information of each of the red data, green data, and blue data of at least one frame or each preset image display area or image display block. The image analysis unit 207 may analyze the amount of each of the red data, green data, and blue data and the ratio of each of the red data, green data, and blue data based on each preset brightness value using a histogram.

[0128] FIG. 12A to FIG. 12C It is a diagram to detect each preset block area Fig.10 Schematic diagram of the results of the loading of red pixels, green pixels and blue pixels of the image shown in .

[0129] Specifically, Fig. 12A is a schematic diagram illustrating a load detection result according to a grayscale value of red image data of each preset block area. Fig. 12B is a schematic diagram illustrating a load detection result according to a grayscale value of green image data of each preset block area. Fig. 12C It is a schematic diagram of a load detection result according to the grayscale value of the blue image data of each preset block area.

[0130] The load detection unit 202 may calculate the load using a preset load detection formula, or may detect or derive the loads of the red pixels, green pixels, and blue pixels of each block area from a database (such as a lookup table) pre-stored in a memory using experimental values. The load may be derived as a value that decreases to about 0 toward black and increases to about 10 or about 100 toward white.

[0131] FIG. 13A to FIG. 13D It is a graphic representation of the calculation of each preset block area. Fig.10 Schematic diagram of the results of optimal frequencies for red pixels, green pixels, and blue pixels of the image shown in .

[0132] Specifically, Fig.13A is a schematic diagram illustrating a driving frequency detection result according to a load detection result of red image data of each preset block area. Fig. 13B is a schematic diagram illustrating a driving frequency detection result according to a load detection result of green image data of each preset block area. Fig. 13C is a diagram illustrating a driving frequency detection result according to a load detection result of blue image data of each preset block area. Fig.13D is a schematic diagram illustrating a result of detecting a driving frequency matched with a load corresponding to a brightness value of each preset block area.

[0133] The driving frequency setting section 204 or the block driving frequency setting section 208 may calculate the driving frequency using a preset frequency detection formula, or may detect or derive the driving frequency of the red pixel PX, the green pixel PX, and the blue pixel PX of each block area from a database (such as a lookup table) pre-stored in a memory using experimental values. The driving frequency may be derived as a value that decreases to about 0.1 Hz toward black and increases to about 60 Hz or about 120 Hz toward white.

[0134] Fig.14 An image of the third embodiment displayed in the display area DA of the display panel 100 is illustrated. Fig.15 It is a graphic Fig.14 Schematic diagram of the results of histogram analysis of the images shown in the table.

[0135] refer to Fig.14 and Fig.15 The image analysis unit 207 can classify the image data of at least one frame into red data, green data and blue data, and can use a histogram to analyze and display the amount of each of the red data, green data and blue data and the proportion of each of the red data, green data and blue data based on each preset grayscale value.

[0136] The image analysis unit 207 may detect grayscale distribution information of each of the red data, green data, and blue data of at least one frame or each preset image display area or image display block. The image analysis unit 207 may analyze the amount of each of the red data, green data, and blue data and the ratio of each of the red data, green data, and blue data based on each preset brightness value using a histogram.

[0137] FIG. 16A to FIG. 16C It is a diagram to detect each preset block area Fig.14 Schematic diagram of the results of the loading of red pixels, green pixels and blue pixels of the image shown in .

[0138] Specifically, Fig.16AIt is a schematic diagram of a load detection result according to the grayscale value of the red image data of each preset block area. Fig. 16B It is a schematic diagram of a load detection result according to the grayscale value of the green image data of each preset block area. Fig. 16C It is a schematic diagram of a load detection result according to the grayscale value of the blue image data of each preset block area.

[0139] The load detection unit 202 may calculate the load using a preset load detection formula, or may detect or derive the loads of the red pixels, green pixels, and blue pixels of each block area from a database (such as a lookup table) pre-stored in a memory using experimental values. The load may be derived as a value that decreases to about 0 toward black and increases to about 10 or about 100 toward white.

[0140] FIG. 17A to FIG. 17D It is a graphic representation of the calculation of each preset block area. Fig.14 Schematic diagram of the results of optimal frequencies for red pixels, green pixels, and blue pixels of the image shown in .

[0141] Specifically, Fig.17A is a schematic diagram illustrating a driving frequency detection result according to a load detection result of red image data of each preset block area. Fig. 17B is a schematic diagram illustrating a driving frequency detection result according to a load detection result of green image data of each preset block area. Fig. 17C is a diagram illustrating a driving frequency detection result according to a load detection result of blue image data of each preset block area. Fig.17D is a schematic diagram illustrating a result of detecting a driving frequency matched with a load corresponding to a brightness value of each preset block area.

[0142] The driving frequency setting section 204 or the block driving frequency setting section 208 may calculate the driving frequency using a preset frequency detection formula, or may detect or derive the driving frequency of the red pixel PX, the green pixel PX, and the blue pixel PX of each block area from a database (such as a lookup table) pre-stored in a memory using experimental values. The driving frequency may be derived as a value that decreases to about 0.1 Hz toward black and increases to about 60 Hz or about 120 Hz toward white.

[0143] Fig.18 and Fig.19 is a schematic perspective view of a quantum dot display device 1 including a quantum dot light emitting layer according to an embodiment.

[0144] exist Fig.18 and Fig.19, the display device 1 is illustrated as a foldable quantum dot display device that is folded in a first direction (X-axis direction). The display device 1 is capable of maintaining a folded state and an unfolded state. The display device 1 can be folded in an inward folding manner, wherein its front surface is arranged on the inner side. In the case where the display device 1 is bent or folded in an inward folding manner, portions of the front surface of the display device 1 may face each other. As another example, the display device 1 may be folded in an outward folding manner, wherein the front surface is arranged on the outer side. In the case where the display device 1 is bent or folded in an outward folding manner, portions of the rear surface of the display device 1 may face each other.

[0145] The first non-folding area NFA1 may be arranged on one side (e.g., right side) of the folding area FDA. The second non-folding area NFA2 may be arranged on the other side (e.g., left side) of the folding area FDA. A touch sensing portion for sensing a touch of a human body or an electronic pen may be formed and arranged on each of the first non-folding area NFA1 and the second non-folding area NFA2.

[0146] The first folding line FOL1 and the second folding line FOL2 may extend in the second direction (Y-axis direction), and the display device 1 may be folded in the first direction (X-axis direction). Therefore, since the length of the display device 1 in the first direction (X-axis direction) can be reduced by about half, the user can easily move or carry the display device 1.

[0147] The direction in which the first folding line FOL1 and the second folding line FOL2 extend is not limited to the second direction (Y-axis direction). For example, the first folding line FOL1 and the second folding line FOL2 may also extend in the first direction (X-axis direction), and the display device 1 may also be folded in the second direction (Y-axis direction). In this case, the length of the display device 1 in the second direction (Y-axis direction) may be reduced by about half. As another example, the first folding line FOL1 and the second folding line FOL2 may extend in the oblique direction of the display device 1 between the first direction (X-axis direction) and the second direction (Y-axis direction). In this case, the display device 1 may be folded into a triangular shape.

[0148] In the case where the first folding line FOL1 and the second folding line FOL2 extend in the second direction (Y-axis direction), the length of the folding area FDA in the first direction (X-axis direction) may be smaller than the length of the folding area FDA in the second direction (Y-axis direction). The length of the first non-folding area NFA1 in the first direction (X-axis direction) may be larger than the length of the folding area FDA in the first direction (X-axis direction). The length of the second non-folding area NFA2 in the first direction (X-axis direction) may be larger than the length of the folding area FDA in the first direction (X-axis direction).

[0149] The first display area DA1 may be arranged on the front surface of the display device 1. The first display area DA1 may overlap the folding area FDA, the first non-folding area NFA1, and the second non-folding area NFA2. Therefore, when the display device 1 is unfolded, an image may be displayed toward the front surface in the folding area FDA, the first non-folding area NFA1, and the second non-folding area NFA2 of the display device 1.

[0150] The second display area DA2 and the second non-display area NDA2 may be arranged on the rear surface of the display device 1. The second display area DA2 may overlap with the second non-folding area NFA2. Therefore, when the display device 1 is folded, an image may be displayed in the second non-folding area NFA2 of the display device 1 toward the front surface.

[0151] exist Fig.18 and Fig.19 In the embodiment, the through hole TH or the sub display area SDA in which the camera is formed may be arranged in the first non-folding area NFA1, but the present disclosure is not limited thereto. The through hole TH or the camera may also be arranged in the second non-folding area NFA2 or the folding area FDA.

[0152] Fig. 20 and Fig.21 is a schematic perspective view of a quantum dot display device 1 according to an embodiment of the present disclosure.

[0153] exist Fig. 20 and Fig.21 , the display device 1 is illustrated as a foldable display device that is folded in a second direction (Y-axis direction). The display device 1 can maintain a folded state or an unfolded state. The display device 1 can be folded in an inward folding manner, in which its front surface is arranged on the inner side. In the case where the display device 1 is bent or folded in an inward folding manner, parts of the front surface of the display device 1 may face each other. As another example, the display device 1 may be folded in an outward folding manner, in which the front surface is arranged on the outer side. In the case where the display device 1 is bent or folded in an outward folding manner, parts of the rear surface of the display device 1 may face each other.

[0154] The display device 1 may include a folding area FDA, a first non-folding area NFA1, and a second non-folding area NFA2. The folding area FDA may be an area where the display device 1 is folded, and the first non-folding area NFA1 and the second non-folding area NFA2 may be areas where the display device 1 is not folded. The first non-folding area NFA1 may be arranged on one side (e.g., the lower side) of the folding area FDA. The second non-folding area NFA2 may be arranged on the other side (e.g., the upper side) of the folding area FDA.

[0155] A touch sensing part for sensing a user's touch may be formed and arranged on each of the first and second non-folding areas NFA1 and NFA2 .

[0156] The folding area FDA may be an area bent with a curvature (e.g., a predetermined or selectable curvature) at the first folding line FOL1 and the second folding line FOL2. Therefore, the first folding line FOL1 may be a boundary between the folding area FDA and the first non-folding area NFA1, and the second folding line FOL2 may be a boundary between the folding area FDA and the second non-folding area NFA2.

[0157] The first folding line FOL1 and the second folding line FOL2 may extend in a first direction (X-axis direction). Fig. 20 and Fig.21 As shown in , the display device 1 can be folded in the second direction (Y-axis direction). Therefore, since the length of the display device 1 in the second direction (Y-axis direction) can be reduced by about half, the user can easily carry the display device 1.

[0158] The direction in which the first folding line FOL1 and the second folding line FOL2 extend is not limited to the first direction (X-axis direction). For example, the first folding line FOL1 and the second folding line FOL2 may also extend in the second direction (Y-axis direction), and the display device 1 may also be folded in the first direction (X-axis direction). In this case, the length of the display device 1 in the first direction (X-axis direction) may be reduced by about half. As another example, the first folding line FOL1 and the second folding line FOL2 may extend in the oblique direction of the display device 1 between the first direction (X-axis direction) and the second direction (Y-axis direction). In this case, the display device 1 may be folded into a triangular shape.

[0159] In the case where the first folding line FOL1 and the second folding line FOL2 extend in the first direction (X-axis direction), as shown in FIG. Fig. 20 and Fig.21 As shown in , the length of the folding area FDA in the second direction (Y-axis direction) may be smaller than the length of the folding area FDA in the first direction (X-axis direction). The length of the first non-folding area NFA1 in the second direction (Y-axis direction) may be larger than the length of the folding area FDA in the second direction (Y-axis direction). The length of the second non-folding area NFA2 in the second direction (Y-axis direction) may be larger than the length of the folding area FDA in the second direction (Y-axis direction).

[0160] The first display area DA1 may be arranged on the front surface of the display device 1. The first display area DA1 may overlap the folding area FDA, the first non-folding area NFA1, and the second non-folding area NFA2. Therefore, when the display device 1 is unfolded, an image may be displayed toward the front surface in the folding area FDA, the first non-folding area NFA1, and the second non-folding area NFA2 of the display device 1.

[0161] The second display area DA2 may be arranged on the rear surface of the display device 1. The second display area DA2 may overlap with the second non-folding area NFA2. Therefore, when the display device 1 is folded, an image may be displayed in the second non-folding area NFA2 of the display device 1 toward the front surface.

[0162] exist Fig. 20 and Fig.21 In the embodiment, the through hole TH in which the camera is formed may be arranged in the second non-folding area NFA2, but the present disclosure is not limited thereto. The through hole TH or the camera may also be arranged in the first non-folding area NFA1 or the folding area FDA.

[0163] Fig. 22 is a schematic perspective view of a rollable quantum dot display device 10 according to an embodiment of the present disclosure. Fig.23 is a schematic perspective view of a rollable quantum dot display device 10 according to an embodiment of the present disclosure.

[0164] refer to Fig. 22 and Fig.23 Each of the rollable quantum dot display devices 10 can be applied as a display portion of a portable electronic device such as a tablet PC, a mobile communication terminal, an electronic notepad, an e-book reader, or a UMPC. The display panel of each of the rollable quantum dot display devices 10 can be bent and rolled in a first direction (X-axis direction) or a second direction (Y-axis direction).

[0165] The quantum dot display device of the above-described embodiment can prevent image display defects (such as brightness reduction and flicker) caused by low-frequency driving, thereby maintaining or improving image display quality even during a period of reduced power consumption.

[0166] It is capable of improving power consumption reduction efficiency and product reliability by effectively adjusting the optimal driving frequency, image display and retention period, and high-potential driving voltage level based on the results of analysis of characteristics such as display image grayscale distribution, load of each display area, maximum brightness value and grayscale value.

[0167] The above description is an example of the technical features of the present disclosure, and those skilled in the art to which the present disclosure belongs will be able to make various modifications and changes.Therefore, the embodiments of the present disclosure described above can be implemented individually or in combination with each other.

[0168] Therefore, the embodiments disclosed in the present disclosure are not intended to limit the technical spirit of the present disclosure, but are intended to describe the technical spirit of the present disclosure, and the scope of the technical spirit of the present disclosure is not limited by these embodiments. The protection scope of the present disclosure should be interpreted by the attached claims, and should be interpreted as all technical spirits within the equivalent scope are included in the scope of the present disclosure.

Claims

1. A display device, comprising: pixels, the pixels being arranged in a display area of ​​the display panel; and a display driver that determines whether the image data indicates a still image characteristic or a moving image characteristic and controls a supply timing of a data voltage and a pixel driving control signal supplied to the pixel based on a result of the determination, The display driver selectively adjusts a driving frequency for driving the pixel and a level of a high potential voltage supplied to the pixel based on a result of a grayscale analysis of the image data.

2. The display device according to claim 1, wherein: The display driver determines whether a still image is displayed based on the result of the grayscale analysis of the image data, and in a case where it is determined that the still image is displayed, drives the pixels by reducing the driving frequency of the pixels of each preset block or all the pixels and the level of the high potential voltage supplied to the pixels and increasing the image display period during which the data voltage is supplied to the pixels based on the result of the grayscale analysis of the image data.

3. The display device according to claim 1, wherein: The display driver determines whether a moving image is displayed based on a result of the grayscale analysis of the image data, and in a case where it is determined that the moving image is displayed, drives the pixels by increasing the driving frequency of the pixels of each preset block or all the pixels and the level of the high potential voltage supplied to the pixels and reducing the image display period during which the data voltage is supplied to the pixels based on the result of the grayscale analysis of the image data.

4. The display device according to claim 1, wherein: The display driver comprises: a maximum brightness detection unit that sorts image data input from the outside in units of at least one frame and detects a minimum grayscale value and a maximum grayscale value and a minimum brightness value and a maximum brightness value of the image data of at least one frame; a load detection unit, which compares and analyzes grayscale values ​​or brightness values ​​of the image data of at least one frame, and detects load information of pixels of each preset image display block and load information of all pixels of at least one frame; an image analysis unit that analyzes the grayscale value and the brightness value of the image data of at least one frame using a histogram, and detects grayscale distribution information of each preset image display block and grayscale distribution information of at least one frame; and A driving frequency setting unit, which changes and sets the driving frequency of the pixels of at least one frame in units of at least one frame period according to the range of the minimum grayscale value and the maximum grayscale value and the minimum brightness value and the maximum brightness value of the image data including at least one frame.

5. The display device according to claim 4, wherein: The display driver further includes a load level setting section that analyzes a grayscale display range and a brightness display range of image data of each preset image display block or at least one frame according to the range of the minimum grayscale value and the maximum grayscale value and the minimum brightness value and the maximum brightness value of the image data including at least one frame, and The driving frequency setting section changes and sets the driving frequency of the pixels of at least one frame in units of at least one frame period according to the grayscale display range and the brightness display range of the image data of each preset image display block or at least one frame.

6. The display device according to claim 4, wherein: The display driver further comprises: a block driving frequency setting section, which changes and sets the driving frequency of the pixels of each preset image display block in units of at least one frame period according to the grayscale distribution information of each preset image display block and the grayscale distribution information of at least one frame; a driving voltage setting section that changes and sets the level of the high potential voltage supplied to the pixel in units of at least one frame period according to the range of the minimum grayscale value and the maximum grayscale value and the minimum brightness value and the maximum brightness value of the image data including at least one frame; an image display period setting section that changes and sets a supply period of an image data voltage supplied to the pixels of at least one frame in response to a change in the driving frequency of the pixels of at least one frame that is changed and set in units of at least one frame period; and A panel driving control section changes the supply timing and supply period of the pixel driving control signal and the data voltage supplied to the pixel in response to a change in the driving frequency changed and set in units of at least one frame period.

7. The display device according to claim 6, wherein: The driving voltage setting section changes and sets the level of the high potential voltage supplied to the pixels of each preset image display block according to a range including minimum and maximum grayscale values ​​and minimum and maximum brightness values ​​of the image data of each preset image display block.

8. The display device according to claim 6, wherein: The image display period setting section changes and sets the supply period of the image data voltage supplied to the pixels of each preset image display block in units of preset image display blocks in response to changes in the driving frequency of the pixels of each preset image display block that is changed and set in units of at least one frame period.

9. The display device according to claim 6, wherein: The panel drive control unit changes the supply timing and the supply period of the pixel drive control signal and the data voltage sequentially supplied to the pixels of each preset image display block in response to a change in the driving frequency of the pixels of each preset image display block that is changed and set in units of at least one frame period.

10. The display device according to claim 6, wherein: the panel drive control section changes the level of the high potential voltage supplied to the pixel in units of at least one frame period in response to high potential voltage level information of the pixel of at least one frame changed and set in units of at least one frame period; Or in response to the high potential voltage level information of the pixels of each preset image display block changed and set in units of at least one frame period, the level of the high potential voltage supplied to the pixels of each preset image display block is changed in units of at least one frame period.

11. The display device according to claim 6, wherein: The panel driving control part sequentially supplies data voltages to the pixels in units of at least one horizontal line in response to an image data voltage supply period of the pixels of at least one frame changed and set in units of at least one frame period; Or, in response to the image data voltage supply period of the pixels of each preset image display block being changed and set in units of at least one frame period, data voltages are sequentially supplied to the pixels in units of at least one horizontal line.

12. A display device, comprising: pixels, the pixels being arranged in a display area of ​​the display panel; and a display driver that determines whether the image data indicates a still image characteristic or a moving image characteristic and controls a supply timing of a data voltage and a pixel driving control signal supplied to the pixel based on a result of the determination, The display driver determines whether a still image is displayed based on a result of a grayscale analysis of the image data, and in a case where it is determined that the still image is displayed, the pixel is driven by reducing a driving frequency of pixels of each preset block or all of the pixels and a level of a high potential voltage supplied to the pixel and increasing an image display period during which the data voltage is supplied to the pixel, according to the result of the grayscale analysis of the image data.

13. The display device according to claim 12, wherein: The display driver comprises: a maximum brightness detection unit that sorts image data input from the outside in units of at least one frame and detects a minimum grayscale value and a maximum grayscale value and a minimum brightness value and a maximum brightness value of the image data of at least one frame; a load detection unit, which compares and analyzes grayscale values ​​or brightness values ​​of the image data of at least one frame, and detects load information of pixels of each preset image display block and load information of all pixels of at least one frame; an image analysis unit that analyzes the grayscale value and the brightness value of the image data of at least one frame using a histogram, and detects grayscale distribution information of each preset image display block and grayscale distribution information of at least one frame; and A driving frequency setting unit, which changes and sets the driving frequency of the pixels of at least one frame in units of at least one frame period according to the range of the minimum grayscale value and the maximum grayscale value and the minimum brightness value and the maximum brightness value of the image data including at least one frame.

14. The display device according to claim 13, wherein: The display driver further includes a load level setting section that analyzes a grayscale display range and a brightness display range of image data of each preset image display block or at least one frame according to the range of the minimum grayscale value and the maximum grayscale value and the minimum brightness value and the maximum brightness value of the image data including at least one frame, and The driving frequency setting section changes and sets the driving frequency of the pixels of at least one frame in units of at least one frame period according to the grayscale display range and the brightness display range of the image data of each preset image display block or at least one frame.

15. The display device according to claim 13, wherein: The display driver further comprises: a block driving frequency setting section, which changes and sets the driving frequency of the pixels of each preset image display block in units of at least one frame period according to the grayscale distribution information of each preset image display block and the grayscale distribution information of at least one frame; a driving voltage setting section that changes and sets the level of the high potential voltage supplied to the pixel in units of at least one frame period according to the range of the minimum grayscale value and the maximum grayscale value and the minimum brightness value and the maximum brightness value of the image data including each preset image display block or at least one frame; an image display period setting section that changes and sets a supply period of an image data voltage supplied to the pixels of at least one frame in response to a change in the driving frequency of the pixels of at least one frame that is changed and set in units of at least one frame period; and A panel driving control section changes the supply timing and supply period of the pixel driving control signal and the data voltage supplied to the pixel in response to a change in the driving frequency changed and set in units of at least one frame period.

16. The display device according to claim 15, wherein: The image display period setting section changes and sets the supply period of the image data voltage supplied to the pixels of each preset image display block in units of preset image display blocks in response to changes in the driving frequency of the pixels of each preset image display block that is changed and set in units of at least one frame period.

17. The display device according to claim 15, wherein: The panel drive control unit changes the supply timing and the supply period of the pixel drive control signal and the data voltage sequentially supplied to the pixels of each preset image display block in response to a change in the driving frequency of the pixels of each preset image display block that is changed and set in units of at least one frame period.

18. The display device according to claim 15, wherein: the panel drive control section changes the level of the high potential voltage supplied to the pixel in units of at least one frame period in response to high potential voltage level information of the pixel of at least one frame changed and set in units of at least one frame period; Or in response to the high potential voltage level information of the pixels of each preset image display block changed and set in units of at least one frame period, the level of the high potential voltage supplied to the pixels of each preset image display block is changed in units of at least one frame period.

19. The display device according to claim 15, wherein: The panel driving control part sequentially supplies data voltages to the pixels in units of at least one horizontal line in response to an image data voltage supply period of the pixels of at least one frame changed and set in units of at least one frame period; Or, in response to the image data voltage supply period of the pixels of each preset image display block being changed and set in units of at least one frame period, data voltages are sequentially supplied to the pixels in units of at least one horizontal line.

20. A display device, comprising: pixels, the pixels being arranged in a display area of ​​the display panel; and a display driver that determines whether the image data indicates a still image characteristic or a moving image characteristic and controls a supply timing of a data voltage and a pixel driving control signal supplied to the pixel based on a result of the determination, Wherein, the display driver determines whether a moving image is displayed based on the result of the grayscale analysis of the image data, and when it is determined that the moving image is displayed, the pixel is driven by increasing the driving frequency of the pixels of each preset block or all the pixels and the level of the high potential voltage supplied to the pixel and reducing the image display period during which the data voltage is supplied to the pixel based on the result of the grayscale analysis of the image data.

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