Transparent display device and control method thereof

Abstract

A transparent display apparatus and a control method thereof are provided. The transparent display device includes: a sensor configured to measure a color characteristic of light incident on the transparent display device; and a transparent display panel configured to display an image in which an input image in a transparent region (non-image region) is corrected based on the measured color characteristics, thereby correcting color distortion.

Description

Technical Field

[0001] The present disclosure relates to a transparent display device, and more particularly, for example but not limited to, a transparent display device and a control method thereof capable of correcting a hue of a non-display area (transparent area) of a display image according to background illumination and a screen image of the transparent display device. Background Art

[0002] Since display panels are used in a variety of fields, various types of display panels have been manufactured.

[0003] Current flat panel display panels have been implemented as plasma display panels (PDPs), liquid crystal display (LCD) panels, and organic light emitting diode display (OLED) panels.

[0004] Recently, the availability of display panels has been further extended, and transparent display panels have been developed and are attracting attention as an extended field. Such transparent display panels can be implemented as OLED panels that do not require a backlight unit.

[0005] In this way, a transparent display device implemented using an OLED panel or the like can display various types of image contents on a display panel having a certain transmittance, and such transparent display devices can be used in various fields such as store windows, billboards, doors of household appliances, and public displays.

[0006] The descriptions provided in the discussion of the related art section should not be considered prior art merely because they are mentioned in that section or are related to that section. The discussion of the related art section may include information describing one or more aspects of the subject technology, and the descriptions in this section do not limit the present disclosure. Summary of the Invention

[0007] Accordingly, the present disclosure relates to a transparent display device and a control method thereof that substantially eliminate one or more problems caused by the limitations and disadvantages of the related art.

[0008] A transparent display device according to the conventional technology tends to have a pale yellow hue due to an organic film and a cathode. In addition, the hue of the transparent display panel changes according to the illuminance and color temperature of an external light source. Specifically, although the hue of the transparent display panel does not change under yellow illumination, the pale yellow hue of the transparent display panel becomes visible under white illumination.

[0009] The present disclosure proposes a transparent display device using an illuminance sensor and a driving method thereof that can solve conventional problems and extend the utilization efficiency and application range of the transparent display device.

[0010] Specifically, the solution task according to the exemplary embodiments of the present disclosure is to provide a transparent display device using an illuminance sensor and a driving method thereof. The illuminance sensor calculates the background conversion illuminance using the transmittance of the transparent display panel and the background illuminance, so that the display input image in the non-display area can be corrected and displayed according to the calculated background conversion illuminance.

[0011] To achieve these and other advantages and in accordance with the purpose of the present disclosure, as broadly described and embodied herein, a transparent display device may include: a transparent display unit including a plurality of pixels configured to display an image; at least one optical sensor configured to measure an optical characteristic of light incident on the transparent display unit; and an image processor configured to correct image data of a non-image area in the image data based on the optical characteristic.

[0012] In another aspect of the present disclosure, a transparent display device may include: a transparent display unit including a plurality of pixels configured to display an image; at least one optical sensor configured to measure color information of external light incident on a rear surface of the transparent display unit; and an image processor configured to correct data having a zero data value in input image data of the transparent display unit based on the color information of the external light.

[0013] In yet another aspect of the present disclosure, a control method of a transparent display device is provided. The transparent display device may include a transparent display unit configured to display an image. The control method may include: measuring an optical characteristic of light incident on the transparent display unit; and correcting image data of a non-image area in the image data based on the optical characteristic.

[0014] The solution task according to the exemplary embodiments of the present disclosure is not limited to the tasks mentioned above, and other tasks not mentioned herein will be clearly understood by those skilled in the art from the following description.

[0015] The effects of the present disclosure are not limited to the effects shown above, and various other effects are included in this specification. In addition, it will be readily understood that the means shown in the claims and their combinations can be used to achieve the purposes and advantages according to the present disclosure.

[0016] Additional advantages, objects, and features of the present disclosure will be partly set forth in the following description, and partly will become apparent to those of ordinary skill in the art upon examination of the following description, or can be learned from the practice of the present disclosure. The objects and other advantages of the present disclosure can be achieved and obtained by the structures particularly pointed out in the written description and its claims as well as the drawings.

[0017] It should be understood that the foregoing general description and the following detailed description of the present disclosure are both exemplary and explanatory, and are intended to provide further explanation of the claimed present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings, which are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this application, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure. In the drawings:

[0019] Figure 1 is a block diagram of a transparent display device according to an exemplary embodiment of the present disclosure;

[0020] Figure 2 is a configuration block diagram showing a transparent display device according to an exemplary embodiment of the present disclosure;

[0021] Figure 3 is a diagram showing an example of a transparent region and a non-transparent region provided in a display region according to an exemplary embodiment of the present disclosure;

[0022] Figure 4 is a circuit diagram of a sub-pixel of a transparent display device according to an exemplary embodiment of the present disclosure;

[0023] Figure 5 shows Figure 3 an example of I-I' of

[0024] Figure 6 is the transmittance of a transparent display device according to an exemplary embodiment of the present disclosure by wavelength;

[0025] Figure 7 is a diagram showing each transparent display image according to the color of an external light source;

[0026] Figure 8 is a diagram for describing improvement points according to the color of an external light source;

[0027] Figure 9 is a diagram for describing a method of improving a transparent display device;

[0028] Figure 10 is a block diagram of an image processor according to an exemplary embodiment of the present disclosure;

[0029] Figure 11 is a flowchart showing a step-by-step image processing method according to an exemplary embodiment of the present disclosure; and

[0030] Figure 12 shows the position of an illuminance / color coordinate sensor of a transparent display device according to an exemplary embodiment of the present disclosure.

[0031] Throughout the drawings and the detailed description, unless otherwise specified, the same reference numerals should be understood to refer to the same elements, features, and structures. For clarity, illustration, and convenience, the relative sizes and descriptions of these elements may be exaggerated. Detailed Description

[0032] Reference will now be made in detail to embodiments of the present disclosure, examples of which may be illustrated in the drawings. The described processing steps and / or operations are examples; however, the order of the steps and / or operations is not limited to the order set forth herein and may be changed as known in the art, except for steps and / or operations that must occur in a specific order. The names of the various elements used in the following description may have been chosen merely for convenience in writing the specification and may therefore be different from the names used in actual products.

[0033] Advantages and features of the present disclosure, as well as the methods for achieving the advantages and features, will become apparent with reference to the embodiments described in detail below in conjunction with the drawings. However, the present disclosure is not limited to the exemplary embodiments disclosed below and may be implemented in various different forms, and the present embodiments allow the present disclosure to be complete and provided to fully inform those of ordinary skill in the art to which the present disclosure pertains of the scope of the present disclosure. In addition, the present disclosure is defined only by the scope of the claims.

[0034] When describing positional relationships, for example, when an element or layer is referred to as being "on" another element or layer, this includes both the case where the element is directly on top of the other element or layer and the case where there is another layer or element intervening therebetween.

[0035] When describing temporal relationships, for example, when a temporal sequence is described as "after", "subsequently", "then", "before", etc., it may also include discontinuous cases unless "immediately" or "directly" is used.

[0036] Even though terms such as first, second, A, B, (a), (b), etc. are used to describe various components, it should be understood that these components are not limited by these terms. These terms are only used to distinguish one component from another, and the nature, order, or number of elements are not limited by these terms. Thus, it is obvious that within the technical concept of the present disclosure, the first component mentioned below may also be the second component.

[0037] In this specification, an image refers to a visual image and means all elements that appear on a screen or display device. The image may include a moving image, a still image, a still cutout, etc. The moving image may include a plurality of frames, and each frame may include a plurality of layers or regions. The image may be a two-dimensional (2D) image or a three-dimensional (3D) image. In this specification, the image is processed for both the case where the image is a 2D image and the case where the image is a 3D image. Therefore, hereinafter, unless otherwise specifically mentioned, both the 2D image and the 3D image are referred to as an image.

[0038] In this specification, an image signal refers to a signal that is converted into an electrical signal and output so that an image can be displayed on the screen or panel of a display device, and is a signal that allows the transmission and reception of image data.

[0039] In this specification, image processing or image correction means processing an input image by a processing unit or a processor through signal processing for an adaptation purpose, and includes both analog signal processing and digital signal processing. Hereinafter, for convenience of description, image processing means digital image processing of an image. However, image processing is not limited thereto and can be interpreted broadly. In addition, the image processing in this specification may include at least four types, namely, point processing, region processing, geometric processing, and frame processing. Point processing is performed in units of pixels based on the position of the pixels. Region processing may change the pixel value based on the original value of the pixel and the values of adjacent pixels, and geometric processing may change the position or arrangement of the pixels. Frame processing may change the pixel value based on the operation of two or more images.

[0040] In this specification, a transparent display device means a display device in which at least a partial region of the screen of the display device recognized by a user is transparent. In this specification, the transparency of the transparent display device means the level at which the transparent display device allows a user to recognize at least an object behind the display device. In this specification, a transparent display device means, for example, a display device having a transmittance of at least 20% of the transparent display device. Depending on the transmittance of the transparent display device, the amount of light passing through the rear surface of the transparent display device can be determined. In this specification, "incident light" refers to light that is incident on the transparent display device and passes through the transparent display device.

[0041] In this specification, the front surface and the rear surface of the transparent display device are defined based on the light emitted from the transparent display device. In this specification, the front surface of the transparent display device means the surface from which light is emitted from the transparent display device, and the rear surface of the transparent display device means the surface opposite to the surface from which light is emitted from the transparent display device.

[0042] In this specification, color information refers to the color characteristics of incident light or a displayed screen, and can be represented by various color coordinates such as YUV, CMYK, HSV, RGB, etc. However, in this specification, for ease of description, it is assumed that the color information is given in RGB color coordinates. Additionally, as needed, each color coordinate can be converted from RGB to HSV or from HSV to RGB considering the purpose of use or the amount of calculation.

[0043] For ease of description, the size and thickness of each component shown in the drawings are illustrated, and the present disclosure is not necessarily limited to the size and thickness of the components shown.

[0044] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the exemplary embodiments belong. It should be further understood that terms such as those defined in common dictionaries should be interpreted as having a meaning that is, for example, consistent with their meaning in the context of the relevant art, and should not be interpreted as idealized or overly formal meanings unless explicitly defined as such herein. For example, the term "part" or "unit" can be applied, for example, to a separate circuit or structure, an integrated circuit, a computational block of a circuit device, or any structure configured to perform functions that one of ordinary skill in the art would understand from the description.

[0045] The present disclosure will be described in detail below with reference to the accompanying drawings.

[0046] Figure 1 is a block diagram of a transparent display device including an image processing device according to an exemplary embodiment of the present disclosure. The transparent display device 100 according to an exemplary embodiment of the present disclosure includes an image input unit 110, an illuminance / color coordinate sensor 120, an image processor 130, and / or a transparent display unit 140, etc.

[0047] The surrounding environment projected onto the transparent display device 100 has various illuminance environments. For example, the indoor illuminance in an office is about 200 to 500 lux, the illuminance under the shadow of a building or forest during the day is about 20,000 to 30,000 lux, and the illuminance under the midday sun is about 50,000 to 100,000 lux. Due to these usage environments, the change in the brightness of the light incident on the transparent display device 100 is diverse.

[0048] The user's eyes change according to the illumination environment. For example, in a low illumination environment of 200 lux, the user can clearly visually recognize a low-brightness image. However, in an illumination environment of 30,000 lux, the user cannot clearly visually recognize a low-brightness image. Depending on the illumination environment, the user's pupil may dilate or constrict, enabling the user to clearly visually recognize an image with a small amount of light, or the user's pupil may not be able to visually recognize light with high brightness.

[0049] The incident light may have color characteristics. Depending on the distribution of intensity by wavelength, the light incident on the transparent display device 100 may have all color information not only in white but also in natural colors. The incident light may be light from a lamp, sunlight, etc., and may include different color information depending on the position of the lamp or the sun. For example, an incandescent lamp and a fluorescent lamp may have different color temperatures, and sunlight may include different color information at sunrise, sunset, in the morning, at noon, and in the afternoon. When light with color information is incident, the light may have a significant impact on the visibility of the displayed image. That is, the overall color of the images displayed together may be distorted due to the background of the transparent display device 100, and the brightness contrast may be reduced for a specific color.

[0050] When light with color information is incident on the transparent display device 100, the transparent display device 100 according to an exemplary embodiment of the present disclosure may measure the color information of the incident light and correct the color of the image displayed on the transparent display unit 140 based on the measured color information. Therefore, the transparent display device 100 according to an exemplary embodiment of the present disclosure can improve the visibility of the displayed image and reduce power consumption by controlling the light emission of the transparent display unit.

[0051] The image input unit 110 receives an image and inputs the image to the image processor 130. The image input unit 110 may receive an image from an external device, a memory of the transparent display device 100, or a wired / wireless receiving device. The image input unit 110 may receive an input via D-Sub, DVI, HDMI, S-Video, component video, etc. The image input unit 110 inputs the received image to the image processor 130.

[0052] The illuminance / color coordinate sensor 120 may be configured to measure the optical characteristics of the light incident on the transparent display device 100 including the illuminance / color coordinate sensor 120. The illuminance / color coordinate sensor 120 measures the amount of light and the color information of the light incident on the transparent display device 100 including the illuminance / color coordinate sensor 120, and transmits the measured illuminance information and color information to the image processor 130. Hereinafter, the illuminance / color coordinate sensor 120 may be referred to as an illuminance / color coordinate sensor, a color illuminance sensor, a color photodiode, etc., without being limited thereto.

[0053] The transparent display device 100 may be exposed to various light environments, including backlight, direct light, and light conditions with different distributions. The transparent display device 100 may collect information related to various light environments through the illuminance / color coordinate sensor 120, and may be configured to identify an object on the rear surface and ensure the visibility of an image based on the information related to the light environment. Hereinafter, the illuminance / color coordinate sensor 120 may be referred to as an optical module, a photodiode, a phototransistor, etc. The illuminance / color coordinate sensor 120 of the transparent display device 100 may include various filters, such as an HPF (high-pass filter), an LPF (low-pass filter), a BPF (band-pass filter), an ultraviolet film, an infrared film, etc., to measure only the information in a specific visible light region. That is, the illuminance / color coordinate sensor 120 of the transparent display device 100 may be configured to filter infrared light or ultraviolet light that may be measured as noise.

[0054] The illuminance / color coordinate sensor 120 of the transparent display device 100 according to an exemplary embodiment of the present disclosure may be configured as one illuminance / color coordinate sensor 120, or may be configured by combining a plurality of illuminance / color coordinate sensors 120. In addition, the illuminance / color coordinate sensor 120 of the transparent display device 100 according to an exemplary embodiment of the present disclosure may be provided as an independent illuminance / color coordinate sensor 120 in a non-display area of the transparent display device 100, but is not limited thereto. Hereinafter, unless otherwise specifically mentioned, for the sake of convenience of description, the illuminance / color coordinate sensor 120 is shown as being provided on the transparent display unit 140. However, the illuminance / color coordinate sensor 120 may be installed in a non-display area of the transparent display unit.

[0055] The illuminance / color coordinate sensor 120 of the transparent display device 100 according to an exemplary embodiment of the present disclosure may be an illuminance / color coordinate sensor 120 configured by combining a plurality of illuminance / color coordinate sensors that respectively measure color information of different colors, but is not limited thereto. Hereinafter, the illuminance / color coordinate sensor 120 of the transparent display device 100 according to an exemplary embodiment of the present disclosure may be an illuminance / color coordinate sensor 120 configured by combining three illuminance / color coordinate sensors that respectively measure the color information of R, G, and B. However, the illuminance / color coordinate sensor 120 may be configured as one illuminance / color coordinate sensor, or may be an image sensor including a plurality of pixels.

[0056] The measured value of the light incident on the illuminance / color coordinate sensor 120 of the transparent display device 100 according to an exemplary embodiment of the present disclosure may be converted into digital signals corresponding to the R, G, and B color coordinates, and the converted digital signals may be referred to as the R, G, and B measurement values of the incident light.

[0057] The image processor 130 may be configured to receive an image from the image input unit 110, receive color information of the light incident on the transparent display device 100 from the illuminance / color coordinate sensor 120, and correct or process the image based on the received color information of the light. The image processor 130 may generate an image signal for displaying the image. The image processor 130 may send the generated image signal to the transparent display unit 140.

[0058] The transparent display unit 140 receives the processed image signal from the image processor 130 and displays the image by outputting the image signal. The transparent display unit 140 performs the function of displaying the image processing result of the image processor 130. In the present specification, the transparent display unit 140 may be a synonym for a transparent indicator, a transparent display, etc., and is not limited thereto. The transparent display device 100 according to an exemplary embodiment of the present disclosure may include various transparent display units 140.

[0059] The transparent display unit 140 of the transparent display device 100 according to an exemplary embodiment of the present disclosure may be a transparent organic light emitting diode display device. The organic light emitting diode display device is a display device that emits light from an organic light emitting layer by allowing current to flow through the organic light emitting layer. The transparent organic light emitting diode display device emits light of a specific wavelength by using the organic light emitting layer. The transparent organic light emitting diode display device includes at least a cathode, an organic light emitting layer, and an anode. In addition, the transparent organic light emitting diode display device may include a light emitting region configured to emit display light and a transparent region configured to allow incident light to pass therethrough. Since the transparent region has a structure adjacent to the light emitting region, when the light incident on the transparent region is too bright, the intensity of the light in the light emitting region becomes relatively weak, resulting in a problem that the user actually only perceives the light in the transparent region. Therefore, the contrast under bright room conditions or the gamma curve characteristics under bright room conditions vary according to the brightness of the transparent region.

[0060] In addition, the transparent display unit 140 may be driven by a passive matrix and an active matrix, and reference Figure 3 Specifically describe the driving of the transparent organic light emitting diode display device.

[0061] A transparent organic light-emitting diode display device can be configured using a top-emission method and a bottom-emission method. An organic light-emitting diode display device using the top-emission method refers to an organic light-emitting diode display device in which light emitted from an organic light-emitting element is emitted toward the upper side of the organic light-emitting diode display device, and refers to an organic light-emitting diode display device in which light emitted from the organic light-emitting element is emitted toward the upper surface of a substrate on which a thin-film transistor for driving the organic light-emitting diode display device is formed. An organic light-emitting diode display device using the bottom-emission method refers to an organic light-emitting diode display device in which light emitted from an organic light-emitting element is emitted toward the lower side of the organic light-emitting diode display device, and refers to an organic light-emitting diode display device in which light emitted from the organic light-emitting element is emitted toward the lower surface of a substrate on which a thin-film transistor for driving the organic light-emitting diode display device is formed. In addition, a transparent organic light-emitting diode display device can be configured using a dual-emission method. An organic light-emitting diode display device using the dual-emission method refers to an organic light-emitting diode display device in which light emitted from an organic light-emitting element is emitted to both the upper and lower sides of the organic light-emitting diode display device, and refers to an organic light-emitting diode display device that can be driven using both the top-emission method and the bottom-emission method. By setting the thin-film transistor, the anode, and the cathode to optimize the configuration of each of the light-emission methods, each of the organic light-emitting diode display devices using the top-emission method, the bottom-emission method, and the dual-emission method can be optimally set so that the thin-film transistor does not interfere with the light-emitting direction of the light-emitting element. Hereinafter, for ease of description, it is assumed that a transparent organic light-emitting diode display device is configured using the top-emission method.

[0062] Hereinafter, a description will be given of the specific configuration of the transparent display unit 140 according to an exemplary embodiment of the present disclosure.

[0063] Figure 2 is a block diagram showing the driving of the transparent display device, Figure 3 is shown in Figure 2 Examples of the transparent region and the non-transparent region in the display area of Figure 4 is a circuit diagram of the sub-pixel, Figure 5 is shown Figure 3 Examples of the cross-section taken along I-I' of Figure 6 is the transmittance of the transparent display device by wavelength, Figure 7 and Figure 8 is a diagram for describing the improvement points according to the color of the external light source, and Figure 9 is a diagram for describing a method of improving the transparent display device.

[0064] Referring to Figures 2 to 9, the transparent display panel 250 according to an exemplary embodiment of the present disclosure may be divided into a display area DA where pixels P are formed to display an image and a non-display area NDA where no image is displayed. The non-display area NDA may be an area other than the display area DA, and may also be referred to as an edge area or a border area. All or part of the non-display area NDA may be an area visible from the front surface of the transparent display device 100, or an area that is curved and invisible from the front surface of the transparent display device 100, or an area covered by a housing or a casing (not shown) of the transparent display device 100.

[0065] As Figure 2 shown, the transparent display device includes an image processor 130, a timing controller 220, a scan driver 230, a data driver 240, a transparent display panel 250, etc.

[0066] The timing controller 220 may be configured in a single integrated circuit or may be configured by patterning on the panel, and the timing controller 220 and the data driver 240 may be provided in various forms, such as COG (chip on glass), COP (chip on panel), COF (chip on film), PCB, and FPCB (flexible printed circuit board).

[0067] The image processor 130 provides a corrected image to the timing controller 220. The image processor 130 may receive color information of light incident on the transparent display device 100 from the illuminance / color coordinate sensor 120, and the corrected image may be an image corrected based on the color information of the incident light.

[0068] The timing controller 220 may be referred to as a driver, and the driver generates a scan control signal based on the corrected image to control the scan driver 230 and generates a data signal to control the data driver 240.

[0069] The data driver 240 receives an input of a data signal from the timing controller 220 via one or more predetermined interfaces. The data signal may include various signal formats, such as LVDS (low voltage differential signal), MIPI (mobile industry processor interface), RGB, etc. For example, such interfaces may include an LVDS (low voltage differential signal) interface, an embedded clock point-to-point interface (EPI), a serial peripheral interface (SPI), etc. The data driver 240 converts the data signal through a corresponding gamma voltage and determines the amount of current flowing through the anode and cathode of the organic light-emitting element to control the light emission level of the corresponding pixel.

[0070] The scan driver 230 operates to drive scan lines so that data signals can be input to sub-pixels corresponding to each scan line. The scan driver 230 may have various structures depending on the configuration method of the sub-pixels. For example, when a transistor offset compensation circuit is further included inside the sub-pixel, the scan driver 230 may include an offset sampling scan driver for compensating the offset of the transistor, a light-emitting driver for causing the corresponding pixel to emit light after sampling, and a discharge driver for discharging the pixel. In addition, the scan lines connected to the scan driver 230 may further include sampling scan lines, light-emitting scan lines, and discharge scan lines.

[0071] The scan driver 230 may provide one or more scan line signals for selecting one or more of the above scan lines to the transparent display panel 250.

[0072] A power supply unit (not shown) provides various voltages required for the data driver 240, the scan driver 230, and the anodes and cathodes of the transparent display panel 250 based on an external input voltage provided from the outside. That is, the voltages from the power supply unit are supplied to the data driver 240, the scan driver 230, and the transparent display panel 250 to drive them. The power supply unit may supply ELVDD, ELVSS, VDD, VSS, etc. The power supply unit 340 may be formed as a separate IC. A DC / DC converter and a PWM driver may also be included to supply the required voltages.

[0073] A description will be given below of the driving of the transparent display unit in the transparent display device according to an exemplary embodiment of the present disclosure. The transparent display panel 250 includes a plurality of scan lines, a plurality of data lines, and a plurality of transparent display unit sub-pixels. In Figure 3 order to facilitate the description, one transparent display unit sub-pixel is shown and described. The scan lines extend in a first direction, and the data lines extend in a second direction intersecting this one direction. Each of the sub-pixels includes a switching thin-film transistor connected to each scan line and each data line, and a driving thin-film transistor connected to the anode.

[0074] For example, the first direction may be the column direction or the vertical direction, and the second direction may be the row direction or the horizontal direction, but is not limited thereto. In another example, the first direction may be the row direction or the horizontal direction, and the second direction may be the column direction or the vertical direction.

[0075] The timing controller 220 generates a data signal and a scan control signal based on the image signal provided from the image processor 130. The timing controller 220 provides a scan control signal for controlling the transparent display panel 250 to the scan driver 230, and provides a data signal to the data driver 240.

[0076] The scan driver 230 is connected to one end of each of the scan lines GL (which may be referred to as gate lines), and the transparent display panel 250 is connected to the other end of each of the scan lines GL. The scan driver 230 generates a plurality of scan signals using a scan control signal provided from the transparent display unit timing controller 220 and a gate on / off voltage provided from a voltage generator, and applies the scan signals to the gate lines arranged on the transparent display panel 250.

[0077] The scan driver 230 may include a plurality of gate driver ICs. The gate driver ICs may include a plurality of switching elements directly formed in the peripheral region of the transparent display panel 250 by the same process as the switching elements of the sub-pixels.

[0078] The data driver 240 is connected to one end of each of the data lines DL, and the transparent display panel 250 is connected to the other end of each of the data lines DL. The data driver 240 receives a data signal gamma voltage provided from the timing controller 220. The gamma voltage may be provided from a gamma IC. The data driver 240 converts the data signal into an analog signal based on the gamma voltage through a DAC corresponding to the gamma voltage generator. The gamma voltage may be provided from a gamma voltage generator.

[0079] One end of the data line DL may be connected to the data driver 240 of the transparent display unit 140 through a MUX. By adding a MUX, the number of wirings connecting to the panel and the data driver IC can be reduced.

[0080] In order to cause the organic light-emitting layer to emit light with the image information of the input data signal, a switching thin-film transistor SW and a driving thin-film transistor DR may be used. Depending on the plurality of thin-film transistors, the number of scan lines electrically connected to one pixel can be changed, and the arrangement and design of the scan lines or the thin-film transistors can be various.

[0081] The transparent display panel 250 displays an image in response to the scan signals and the data signals DATA supplied from the driver including the scan driver 230 and the data driver 240. The transparent display panel 250 is implemented using a top emission method, a bottom emission method, or a dual emission method. The transparent display panel 250 includes sub-pixels SP that emit light autonomously to display an image.

[0082] As Figure 3As shown, the display area DA includes a transparent area TA and a non-transparent area NTA. The transparent area TA can be interposed between two adjacent non-transparent areas NTA, but is not limited thereto. The transparent area TA is an area that transmits most of the light incident from the outside, and the non-transparent area NTA is an area that does not transmit most of the light incident from the outside. For example, the transparent area TA can be an area with an optical transmittance greater than α, and the non-transparent area NTA can be an area with an optical transmittance less than β. In this case, α is a value greater than β. In the transparent display device 100, due to the transparent area TA of the transparent display panel 250, an object or background located on the rear surface of the transparent display device 100 can be seen.

[0083] The non-transparent area NTA includes a light-emitting area EA having a plurality of pixels P that emit light. Each of the plurality of pixels P can include a plurality of sub-pixels, such as a first sub-pixel SP1, a second sub-pixel SP2, a third sub-pixel SP3, and a fourth sub-pixel SP4, but is not limited thereto. The first sub-pixel SP1 can include a first light-emitting area EA that emits first-color light, and the second sub-pixel SP2 can include a second light-emitting area EA that emits second-color light. The third sub-pixel SP3 can include a third light-emitting area EA that emits third-color light, and the fourth sub-pixel SP4 can include a fourth light-emitting area EA that emits fourth-color light.

[0084] For example, the first to fourth light-emitting areas EA can all emit light of different colors. For example, the first light-emitting area EA can emit green light, and the second light-emitting area EA can emit red light. The third light-emitting area EA can emit blue light, and the fourth light-emitting area EA can emit white light. However, the present disclosure is not necessarily limited thereto. Light-emitting areas that emit other colors such as cyan, magenta, or yellow are also possible. In addition, the arrangement order of each of the sub-pixels SP1, SP2, SP3, and SP4 can be changed differently.

[0085] Referring to Figure 4 , each of the first sub-pixel SP1, the second sub-pixel SP2, the third sub-pixel SP3, and the fourth sub-pixel SP4 can include a switching transistor SW, a driving transistor DR, a capacitor Cst, a compensation circuit CC, an organic light-emitting diode OLED, and the like.

[0086] The switching transistor SW transfers the data signal provided through the data line DL to the first node N1 in response to the scan signal provided through the gate line GL. For example, the switching transistor SW turns on in response to the scan signal supplied through the gate line GL to transmit the data signal supplied through the data line DL to the first node N1. The capacitor Cst is electrically connected to the first node N1 and is charged using the voltage applied to the first node N1. The driving transistor DR can control the amount of driving current flowing to the organic light-emitting diode OLED in response to the voltage applied to the gate.

[0087] The semiconductor layer of the switching transistor SW and / or the driving transistor DR may include silicon such as amorphous silicon (a-Si), polycrystalline silicon, or low-temperature polycrystalline silicon, or an oxide such as IGZO (indium gallium zinc oxide). However, the present disclosure is not limited thereto.

[0088] The organic light-emitting diode OLED outputs light corresponding to the driving current. The organic light-emitting diode OLED can output light corresponding to any one of red, green, and blue. The organic light-emitting diode OLED may include an anode, a light-emitting layer formed on the anode, and a cathode providing a common voltage. The light-emitting layer may be implemented to emit the same color of light such as white light for each pixel, or may be implemented to emit different colors (e.g., white, red, green, or blue, or cyan, magenta, or yellow, etc.) such as red light, green light, or blue light for each pixel.

[0089] For example, the light-emitting layer may include one or more of a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), and an electron injection layer (EIL), but the present disclosure is not limited thereto.

[0090] The compensation circuit CC may be provided in the pixel to compensate for the threshold voltage of the driving transistor DR, etc. The compensation circuit CC may include one or more transistors. The compensation circuit CC may include one or more transistors and capacitors, and may be configured in various ways according to the compensation method. The pixel including the compensation circuit CC may have various structures such as 3T1C, 4T2C, 5T2C, 6T1C, 6T2C, 7T1C, and 7T2C.

[0091] Figure 5 is Figure 3 a cross-sectional view taken along line I-I'. Refer to Figure 5 , the transparent display panel 250 according to an example of the present disclosure includes a lower substrate 111 and an upper substrate 112 facing each other, and a transistor T and a light-emitting element E including a lower electrode E1, an organic layer EL, and an upper electrode E2 may be provided between the lower substrate 111 and the upper substrate 112.

[0092] The transistor T may include an active layer ACT disposed on a lower substrate 111, a first insulating film I1 disposed on the active layer ACT, a gate electrode GE disposed on the first insulating film I1, a second insulating film I2 disposed on the gate electrode GE, and a source electrode SE and a drain electrode DE disposed on the second insulating film I2 and connected to the active layer ACT through a first contact hole CNT1 and a second contact hole CNT2. Specifically, the source electrode SE and the drain electrode DE may be connected to the active layer ACT through the first contact hole CNT1 and the second contact hole CNT2 that penetrate the first insulating film I1 and the second insulating film I2. In Figure 5 , the transistor T is formed in a top-gate manner in which the gate electrode GE is placed above the active layer ACT. However, the present disclosure is not limited thereto, and the transistor T may be formed in a bottom-gate manner in which the gate electrode GE is placed below the active layer ACT.

[0093] A planarization film PLN may be disposed on the transistor T to protect the transistor T and planarize steps caused by the transistor T and a plurality of signal lines. The planarization film PLN is disposed in the non-transparent region NTA and may not be disposed in at least a part of the transparent region TA. The planarization film PLN may cause light refraction in response to light emission, thereby reducing transparency. Accordingly, the transparent display panel 250 according to an exemplary embodiment of the present disclosure may increase transparency by removing a part of the planarization film PLN in the transparent region TA.

[0094] The planarization film PLN may be formed of one or more materials among an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, an unsaturated polyester resin, a polystyrene resin, a polyphenylene sulfide resin, and a benzocyclobutene, but the embodiments are not limited thereto.

[0095] In addition, in Figure 5 , the first insulating film I1 and the second insulating film I2 disposed below the planarization film PLN are shown to be disposed not only in the non-transparent region NTA but also in the transparent region TA. However, the present disclosure is not necessarily limited thereto. In another embodiment, some of the insulating films disposed below the planarization film PLN may not be disposed in at least a part of the transparent region TA to increase transparency. For example, the second insulating film I2 may be disposed in the non-transparent region NTA and may not be disposed in at least a part of the transparent region TA. Alternatively, the first insulating film I1 and the second insulating film I2 may be disposed in the non-transparent region NTA and may not be disposed in at least a part of the transparent region TA, but the present disclosure is not limited thereto.

[0096] The bank portion 125 and the light-emitting element E including the lower electrode E1, the organic layer EL, and the upper electrode E2 can be disposed on the upper portion of the planarization film PLN in the non-transparent region NTA. The organic layer EL and the upper electrode E2 of the light-emitting element E can be further disposed on the upper portion of the second insulating film I2 in the transparent region TA.

[0097] The lower electrode E1 is disposed on the planarization film PLN for each of the sub-pixels SP1, SP2, SP3, and SP4, and may not be disposed in the transparent region TA. The lower electrode E1 can be electrically connected to the transistor T. Specifically, the lower electrode E1 can be connected to one of the source SE and the drain DE of the transistor T through the third contact hole CNT3 penetrating the planarization film PLN. The bank portion 125 is disposed between adjacent lower electrodes E1, so that the adjacent lower electrodes E1 can be electrically insulated from each other.

[0098] The lower electrode E1 can be formed of a highly reflective metal material, such as a laminated structure of aluminum and titanium (Ti / Al / Ti), a laminated structure of aluminum and ITO (ITO / Al / ITO), an Ag alloy, a laminated structure of an Ag alloy and ITO (ITO / Ag alloy / ITO), a MoTi alloy, and a laminated structure of a MoTi alloy and ITO (ITO / MoTi alloy / ITO), without limitation. The Ag alloy can be an alloy of silver (Ag), palladium (Pd), and copper (Cu). The MoTi alloy can be an alloy of molybdenum (Mo) and titanium (Ti). The lower electrode (E1) can be referred to as an anode, without limitation.

[0099] The bank portion 125 can be disposed on the planarization film PLN. In addition, the bank portion 125 can be formed to cover the edge of the lower electrode E1 and expose a part of the lower electrode E1. Therefore, the bank portion 125 can prevent the problem of current concentration at the end of the lower electrode E1 and reduce the light-emitting efficiency.

[0100] The bank portion 125 can be made of an insulating material containing a black material. The bank portion 125 can be made of, for example, a transparent carbon-based mixture. Specifically, the bank portion 125 can contain carbon black, but is not limited thereto. The bank portion 125 can also be made of a transparent insulating material.

[0101] The organic layer EL can be disposed on the lower electrode E1. The organic layer EL can include a hole transport layer, a light-emitting layer, and an electron transport layer. In this case, when a voltage is applied to the lower electrode E1 and the upper electrode E2, holes and electrons move to the light-emitting layer through the hole transport layer and the electron transport layer, respectively, and combine with each other in the light-emitting layer to emit light. In an exemplary embodiment, the organic layer EL can be a common layer formed in the sub-pixels SP1, SP2, SP3, and SP4. In this case, the light-emitting layer can be a white light-emitting layer that emits white light. In another embodiment, the light-emitting layer of the organic layer EL may not be formed in the transparent region TA.

[0102] The upper electrode E2 can be disposed on the organic layer EL and the bank portion 125. The upper electrode E2 can be formed of a transparent metal material (TCO) such as ITO or IZO that can transmit light, or a semi-transmissive metal material (semi-transmissive conductive material) such as magnesium (Mg), silver (Ag), or an alloy of magnesium (Mg) and silver (Ag), without being limited thereto. When the upper electrode E2 is formed of a semi-transmissive metal material, the light emission efficiency can be improved by the microcavity effect. The upper electrode E2 can be referred to as a cathode, without being limited thereto. As an example, the upper electrode E2 can be formed in the transparent region TA and the non-transparent region NTA. Additionally, the upper electrode E2 may not be formed in the transparent region TA.

[0103] A sealing film 150 can be provided on the light-emitting element E. The sealing film 150 can be formed on the upper electrode E2 to cover the upper electrode E2. The sealing film 150 is used to prevent oxygen or moisture from penetrating into the organic layer EL and the upper electrode E2. For this purpose, the sealing film 150 can include at least one inorganic film and at least one organic film.

[0104] A color filter CF can be provided on one surface of the upper substrate 112 facing the lower substrate 111. The color filter CF can be formed in a pattern for each of the sub-pixels SP1, SP2, SP3, and SP4.

[0105] Specifically, the color filter CF can include a first color filter, a second color filter, a third color filter, and a fourth color filter. The first color filter can be arranged to correspond to the light-emitting region EA of the first sub-pixel SP1, and for example, can be a first color filter that transmits light of a first color. For example, the first color filter can be a green color filter that transmits green light, but is not limited thereto. The second color filter can be arranged to correspond to the light-emitting region EA of the second sub-pixel SP2, and for example, can be a second color filter that transmits light of a second color. For example, the second color filter can be a red color filter that transmits red light, but is not limited thereto. The third color filter CF3 can be arranged to correspond to the light-emitting region EA of the third sub-pixel SP3, and for example, can be a third color filter that transmits light of a third color. For example, the third color filter can be a blue color filter that transmits blue light, but is not limited thereto. The fourth color filter can be arranged to correspond to the light-emitting region EA4 of the fourth sub-pixel SP4, and for example, can be a fourth color filter that transmits light of a fourth color. For example, the fourth color filter can be a white color filter that transmits white light, but is not limited thereto. The white color filter can be made of a transparent organic material that transmits white light. However, the present disclosure is not necessarily limited thereto.

[0106] The light-shielding layer 114 may be disposed between the color filters CF. The light-shielding layer 114 may be disposed between the sub-pixels SP1, SP2, SP3, and SP4 and may prevent color mixing between adjacent sub-pixels SP1, SP2, SP3, and SP4. In addition, the light-shielding layer 114 may prevent light incident from the outside from reflecting on the plurality of signal lines disposed between the sub-pixels SP1, SP2, SP3, and SP4.

[0107] In addition, the light-shielding layer 114 may be disposed between the transparent region TA and the plurality of sub-pixels SP1, SP2, SP3, and SP4 to prevent light emitted from each of the plurality of sub-pixels SP1, SP2, SP3, and SP4 from traveling to the transparent region TA. In an exemplary embodiment, the light-shielding layer 114 may not be disposed between the white sub-pixel and the transparent region TA. The transparent display device 100 according to an exemplary embodiment of the present disclosure may reduce the formation area of the light-shielding layer 114 by not disposing the light-shielding layer 114 between the white sub-pixel and the transparent region TA. In this way, the transparent display device 100 according to an exemplary embodiment of the present disclosure may improve the transmittance. The light-shielding layer 114 may include a light-absorbing material, such as a black dye that absorbs all light in the visible spectrum. The light-shielding layer 114 may be referred to as a black matrix or BM.

[0108] The above-described color filter CF and the light-shielding layer 114 are not disposed in the transparent region TA to maintain a high optical transmittance in the transparent region TA. For example, the color filter CF may be disposed in the light-emitting region EA of the non-transparent region NTA, and the light-shielding layer 114 may be disposed in the non-light-emitting region NEA of the non-transparent region NTA, but is not limited thereto.

[0109] The lower substrate 111 may be a silicon wafer substrate, a glass substrate, or a plastic film formed using a semiconductor process. The upper substrate 112 may be a plastic film, a glass substrate, or a packaging film. The upper substrate 112 and the lower substrate 111 may be made of a transparent material. The size of the lower substrate 111 may be formed to be larger than the size of the upper substrate 112, and thus a part of the lower substrate 111 may be exposed without being covered by the upper substrate 112.

[0110] As described above, the transparent display device 100 according to an exemplary embodiment of the present disclosure includes a transparent region TA that transmits incident light with almost no change and a light-emitting region EA that emits light. As a result, in an exemplary embodiment of the present disclosure, an object or background located on the rear surface or the front surface of the transparent display device 100 may be viewed through the transparent region TA of the transparent display device 100.

[0111] Refer to Figure 3 and Figure 5, the organic layer EL and the upper electrode E2 of the transparent display panel 250 are formed to cover the entire panel across the light-emitting portion and the transmissive portion. Due to the organic layer EL and the upper electrode E2, the visual impression of the transmissive portion of the transparent display panel tends to be light yellow. When checking Figure 6 the transmittance of the transparent display panel by wavelength, it can be confirmed that the transmittance decreases towards shorter wavelengths (blue). Roughly speaking, the transmittance of short-wavelength blue light is about 10% lower than that of long-wavelength red light, and the transmittance of short-wavelength green light is about 5% lower than that of long-wavelength red light.

[0112] As Figure 7 (a) of shows, when the color temperature of the external light source is 2200K to 4300K, the external light source has a light yellow tone, so that the light yellow visual impression of the transparent display panel is not a problem. On the other hand, as Figure 7 (b) of shows, when the color temperature of the external light source is 5000K to 6500K, the external light source has a white tone, so that the light yellow tone of the transparent display panel is visible.

[0113] As Figure 8 (a) of shows, even when the illuminance (brightness) of the external light source and the transparent display panel is similar, if the color of the external light source is slightly red, the wavelength of the external light source is similar to that of the transparent display panel, so the difference in visual impression is small. However, as Figure 8 (b) of shows, when the color of the external light source is slightly blue, the wavelength of the external light source is different from that of the transparent display panel, so the difference in visual impression may be large.

[0114] Due to the organic layer EL and the upper electrode E2 of the transmissive portion, the transparent display panel tends to have a light yellow tone, and depending on the surrounding environment, the tone of the transparent display panel may be very obtrusive. Therefore, the present disclosure can improve the light yellow visual impression of the transparent display panel by using the light source of the light-emitting portion of the transparent display panel. Referring to Figure 9 (a) of and Figure 9 (b) of, by emitting light from pixel B among the pixels of the light-emitting portion of the transparent display panel, the transparent display panel can have an appropriate visual impression. This means that blue light is added to the existing emitted light, the transmittance seems to increase compared to the past, and the light yellow visual impression can be improved. That is, when emitting low-gray light from pixel B, the visual impression of the transparent display panel can be adjusted by adding an appropriate compensation value to the existing emitted light. Although Figure 9 (a) of and Figure 9 (b) of only mention pixel B, the present disclosure is not limited thereto.

[0115] When sensing the surrounding environment, if the external light source has an illuminance (brightness) different from that of the transparent display panel, then refer to Figure 6, since the transmittance decreases toward shorter wavelengths (blue), the different illuminances (brightness) between the external light source and the transparent display panel can be compensated, so that the visual impression of the transparent display panel is not distorted by appropriately emitting light from pixels B and pixels P. Further, when the external light source has a color different from the color of the transparent display panel, referring to Figure 8 (a) of Figure 8 and

[0116] (b) of

[0117] Figure 10 it can be confirmed that even if the illuminances of the external light source and the transparent display panel are similar, the compensation value can be different according to the color of the external light source. When the color of the external light source is slightly red, the compensation value is small. However, when the color of the external light source is slightly blue, the compensation value is large. Figure 11 Therefore, in addition to the transmittance characteristics of the transparent display panel itself, the present disclosure can also sense the illuminance and color coordinates of the external light source in the surrounding environment, so as to calculate in real time the compensation value for each of R, G, and B in the area (transparent area) where the display image is not displayed according to the background characteristics and the screen image that change in real time. Further, the image data (RGB) can be corrected by adding the compensation value to the RGB data value in the area (transparent area) where the display image is not displayed. Figure 10 and Figure 11 a description will be given.

[0118] As an example, the image processor may include: an image characteristic analysis unit configured to analyze the gray level of the image data to determine the image area and the non-image area; a compensation value setting unit configured to calculate the compensation value for each color based on the transmittance difference of each of R, G, and B in the non-image area; and a modulation unit configured to reflect the compensation value for each color calculated by the compensation value setting unit in the image data to output the modulated data.

[0119] Referring to Figure 10 , the image processor 130 includes, but is not limited to, an image characteristic analysis unit 1001, a surrounding environment characteristic analysis unit 1002, a compensation LUT for each gray level 1003, a compensation LUT for each surrounding environment illuminance 1004, a compensation LUT for each surrounding environment color coordinate 1005, a compensation value setting unit 1006, a modulation unit 1007, and an output control unit 1008. Further, the image processor 130 may also include other known image processing blocks.

[0120] The image feature analysis unit 1001 analyzes the image data input from the outside to check the grayscale. The image feature analysis unit 1001 can check the grayscale of each of the R, G, and B colors of the image data. In this case, (R, G, B = r, g, b) can be checked. The image feature analysis unit 1001 divides the image data into an image region and a non-image region. For example, the image feature analysis unit 1001 can be configured to analyze the grayscale of the image data to determine the image region and the non-image region. The image feature analysis unit 1001 classifies the region where the R, G, and B data in a frame of image are all 0 as a non-image region, and classifies the other regions as image regions. When the image data is displayed on the transparent panel device, since there is no displayed image, the non-image region corresponds to the transparent region, and the back surface of the transparent panel device is visible in the transparent region.

[0121] The image data of the non-image region where the R, G, and B data are all 0 can be compensated by the modulation unit 1007 according to the compensation value calculated by the compensation value setting unit 1006. For example, the modulation unit 1007 can be configured to reflect the compensation value of each color calculated by the compensation value setting unit 1006 in the image data to output the modulated data. Here, the compensation value is calculated to improve the slightly yellow visual impression that occurs in the region that needs to be transparently recognized as a non-image region. That is, the image data of the non-image region where the R, G, and B data are all 0 has a predetermined image data value through compensation, so that the slightly yellow visual impression that occurs in the region that needs to be transparently displayed can be improved.

[0122] The image data of the image region is processed in the same way as the image data of the non-image region. However, the compensation value can be set to 0. That is, the image processor 130 can set the compensation value of the data of the image region in the image data to 0.

[0123] The illuminance / color coordinate sensor SEN is provided to detect information such as the intensity and color of the external light existing around the transparent display panel. The external light information detected by the illuminance / color coordinate sensor SEN is provided to the ambient characteristic analysis unit 1002. The illuminance / color coordinate sensor SEN can be selected from a CCD (Charge Coupled Device), a photodiode, a color sensor, etc. For example, the intensity of the light can be checked.

[0124] When an abnormal hue of the transparent region of the transparent display panel is expected due to the color temperature of an external light source, the image processor 130 may compensate the input image of the transparent region so that the transmittance by wavelength can increase compared to before. When the amount of light loss caused by the transmittance difference in the transparent region is compensated, the transmittance for each wavelength becomes similar, causing the slightly yellow hue of the transparent display panel to disappear. To set the compensation value for the amount of light loss, the compensation value setting unit 1006 may select a coefficient α from the compensation LUT 1003 for each gray level, select a coefficient β from the compensation LUT 1004 for each ambient illuminance in response to the external light information (data information on the illuminance of the surrounding environment and the color coordinates of the surrounding environment) transmitted from the illuminance / color coordinate sensor SEN, and select a compensation magnitude γ from the compensation LUT 1005 for each ambient color coordinate.

[0125] The compensation value setting unit 1006 may select coefficients and a compensation magnitude from each LUT to obtain the amount of light loss caused by the transmittance difference in each of R, G, and B in the non-image region. Equation 1 below can be used to calculate the loss amount for each color.

[0126] <Equation 1>

[0127] R loss magnitude = Ambient R light intensity * (1 - R transmittance)

[0128] G loss magnitude = Ambient G light intensity * (1 - G transmittance)

[0129] B loss magnitude = Ambient B light intensity * (1 - B transmittance)

[0130] In Equation 1, the R, G, and B light intensities are the light intensities of the surrounding environment for each of R, G, and B, and the R, G, and B transmittances are the transmittances for each wavelength of the transparent display. For example, when the light intensity (nit) of the surrounding environment for each of (R, G, B) is (100 nit, 150 nit, 50 nit) and the transmittance for each of (R, G, B) is (42%, 39%, 32.5%), the loss magnitude for each of (R, G, B) can be obtained as (100 nit * (1 - 0.42), 150 nit * (1 - 0.39), 50 nit * (1 - 0.325)).

[0131] When the amount of light loss caused by the transmittance difference in the non-image region is compensated, the transmittance becomes similar for each wavelength, and thus the pale yellow color tone of the transparent display panel disappears. In addition, the loss rates of R, G, and B need to be the same to eliminate the distortion of the visual impression of the transmitted light. Specifically, in the case of the transparent display panel, since the transmittance of R is the highest, excessive loss of the brightness of G and B occurs, and the compensation value for each color can be calculated using Equation 2 below. For example, the compensation value setting unit 1006 may be configured to calculate the compensation value for each color based on the transmittance difference of each of R, G, and B in the non-image region.

[0132] <Equation 2>

[0133] G compensation magnitude = G light intensity of the surrounding environment * (R transmittance - G transmittance)

[0134] B compensation magnitude = B light intensity of the surrounding environment * (R transmittance - B transmittance)

[0135] In Equation 2, the G and B light intensities are the light intensities of the surrounding environment for each of R and B, and the G and B transmittances are the transmittances of the transparent display for each wavelength. For example, the compensation magnitude for each of (G, B) can be obtained as (150 nit * (0.42 - 0.39), 50 nit * (0.42 - 0.325)). In addition to <Equation 1> and <Equation 2> given as examples above, compensation values for the transmittance differences of R, G, and B can also be derived by reflecting various compensation coefficients.

[0136] The modulation unit 1007 converts the compensation value for each color in the G and B data of the non-image region into a grayscale value, then adds these values to the R, G, and B data of the existing input image, and outputs the R, G, and B modulation data to the output control unit.

[0137] The output control unit 1008 sorts the modulated image data in the input order and outputs the compensated image. The compensated image output from the output control unit 1008 is provided to the display panel through the data driver.

[0138] The transparent display device according to an exemplary embodiment of the present disclosure is not limited thereto, and various methods can be used to correct the color of the input image.

[0139] Figure 11 is a flowchart showing a step-by-step image processing method according to an exemplary embodiment of the present disclosure. As Figure 11 shown, the image processor 130 can correct the color of the input image based on the histogram data of each color of the input image.

[0140] The image processor 130 can acquire histogram data for each color of the input image. The histogram for each color means data created, for example, for each of R, G, and B colors by dividing the range in which the image exists into 2n parts and detecting the frequency of occurrence of data in each part.

[0141] The image processor 130 can correct the input image based on the RGB values of the measured incident light by correcting the histogram data for each color of the input image.

[0142] The image processor 130 can perform various image processes based on the histogram data for each color. The image processor 130 can analyze the histogram data for each color and perform image processing.

[0143] As an example, the image processor 130 can be configured to analyze the RGB light intensity of the surrounding environment and analyze the transmittance for each wavelength of the panel. The image processor 130 can be configured to calculate a compensation value for each color based on the light intensity of the surrounding environment and the transmittance difference of each of R, G, and B in the non-image area. The image processor 130 can be configured to reflect the compensation value for each color in the image data to output modulated data.

[0144] In this specification, when the transparent display device according to the exemplary embodiment of the present disclosure performs image processing corresponding to the color information of the incident light, histogram shifting, histogram stretching, etc. are described as examples. However, the present disclosure is not limited thereto, and the transparent display device 100 can perform input image color correction based on the color of the incident light through various forms of image processing.

[0145] Figure 12 The position of the illuminance / color coordinate sensor 1216 in the transparent display device 1200 according to the exemplary embodiment of the present disclosure is shown. The transparent display device according to the exemplary embodiment of the present disclosure includes a transmissive display area 1212 and a non-display area 1214.

[0146] In the transparent display device according to an exemplary embodiment of the present disclosure, the position of the illuminance / color coordinate sensor 1216 is not limited. The illuminance / color coordinate sensor 1216 can be arranged without limitation as long as the illuminance / color coordinate sensor 1216 is arranged on one surface of the transparent display device and can measure the light incident on the illuminance / color coordinate sensor 1216. In the transparent display device according to an exemplary embodiment of the present disclosure, the illuminance / color coordinate sensor 1216 can be arranged on the front, back, or side of the transparent display device. For example, when the transparent display device includes multiple sensors, the multiple illuminance / color coordinate sensors 1216 can be independently driven, and the transparent display device can identify the position information of each of the illuminance / color coordinate sensors 1216. Additionally, as the number of illuminance / color coordinate sensors 1216 increases, color measurement can become more accurate.

[0147] In Figure 12 , the illuminance / color coordinate sensor 1216 of the transparent display device is arranged in the non-display area 1214 on one surface of the transparent display device. To more accurately measure the light incident on the transparent display device, the illuminance / color coordinate sensor 1216 can be arranged at the center of the transparent display device.

[0148] Although the present disclosure has been described in more detail with reference to exemplary embodiments, the present disclosure is not necessarily limited to these embodiments, and various modifications can be made without departing from the technical concept of the present disclosure. Therefore, the exemplary embodiments disclosed in the present disclosure are not intended to limit the technical concept of the present disclosure, but to describe the technical concept, and the scope of the technical concept of the present disclosure is not limited by these embodiments. The protection scope of the present disclosure should be interpreted by the appended claims, and all technical concepts within the equivalent scope thereof should be interpreted as being included within the scope of the claims of the present disclosure.

[0149] Cross-reference to related applications

[0150] This application claims the priority benefit of Korean Patent Application No. 10-2023-0197875, filed on December 29, 2023, the entire contents of which are hereby expressly incorporated herein for all purposes.

Claims

1. A transparent display device, comprising: a transparent display unit, the transparent display unit comprising a plurality of pixels configured to display an image; at least one optical sensor configured to measure an optical property of light incident on the transparent display unit; as well as An image processor is configured to correct image data of a non-image area in the image data based on the optical characteristic.

2. The transparent display device according to claim 1, wherein: The at least one optical sensor is configured to measure an illuminance of light incident on a rear surface of the transparent display unit.

3. The transparent display device according to claim 1, wherein: The at least one optical sensor is configured to measure color coordinates of light incident on a rear surface of the transparent display unit.

4. The transparent display device according to claim 2, wherein: The image processor compensates at least one of green data or blue data of the image data based on the optical characteristics of the transparent display unit and a transmittance of red.

5. The transparent display device according to claim 2, wherein: The image processor comprises: an image characteristic analysis unit configured to analyze the grayscale of the image data to determine an image area and the non-image area; a compensation value setting unit configured to calculate a compensation value for each color based on a transmittance difference of each of R, G, and B of the non-image area; and A modulation unit configured to reflect the compensation value of each color calculated by the compensation value setting unit in the image data to output modulation data.

6. The transparent display device according to claim 5, wherein: The image processor also includes: a surrounding environment characteristic analysis unit configured to receive intensity information of external light existing around the transparent display unit, and The compensation value setting unit is further configured to calculate the compensation value for each color based on the intensity information of the external light and the transmittance difference.

7. The transparent display device according to claim 1, wherein: The image processor sets a compensation value of data of an image area in the image data to zero.

8. The transparent display device according to claim 1, wherein: The pixels B and the pixels G in the non-image area where no image is displayed among the pixels of the light emitting portion of the transparent display unit are caused to emit light.

9. The transparent display device according to claim 1, wherein: The image processor is configured to correct the image data by analyzing histogram data for each color of the image.

10. A transparent display device, comprising: a transparent display unit, the transparent display unit comprising a plurality of pixels configured to display an image; at least one optical sensor configured to measure color information of external light incident on a rear surface of the transparent display unit; as well as An image processor is configured to correct data having a zero data value among input image data of the transparent display unit based on the color information of the external light.

11. The transparent display device according to claim 10, wherein: The image processor compares the color information of the external light with previously stored transmittance of the transparent display unit, and corrects the input image data based on a color having a high transmittance.

12. A control method for a transparent display device, the transparent display device comprising a transparent display unit configured to display an image, the control method comprising the following steps: measuring optical properties of light incident on the transparent display unit; as well as Image data of a non-image area in the image data is corrected based on the optical characteristic. 13 . The control method according to claim 12 , further comprising measuring an illuminance of light incident on a rear surface of the transparent display unit. 14 . The control method according to claim 12 , further comprising measuring color coordinates of light incident on a rear surface of the transparent display unit.

Images