KR20240078465A - Transparent display device and method for driving the same - Google Patents

Abstract

This specification relates to a transparent display device that can improve the perceived transparency of a transparent display through image processing. A transparent display device according to several embodiments separates data in the object area and data in the background area from input image data. It may include an image processing unit that adjusts data in the background area to within a transparency recognition standard range, and a display panel that includes a transparent area and a pixel area and displays data output from the image processing unit in the pixel area.

Description

Transparent display device and method of driving the same {TRANSPARENT DISPLAY DEVICE AND METHOD FOR DRIVING THE SAME}

This specification relates to a transparent display device that can improve the perceived transparency of a transparent display and a method of driving the same.

With the development of display devices, transparent display devices are being developed that allow users to see the background beyond the display through a display panel on which images are displayed.

Transparent display devices can be applied to a variety of application fields such as automobile glass, building glass, advertising signs, cooler doors, and screen doors, providing diverse user environments.

Due to the light transmission characteristics of a transparent display device, the on-screen image displayed on the panel and the background behind the panel can be perceived together.

Transparent display devices have cost issues when increasing physical transmittance by changing the panel design to improve transparency or when creating and providing transparent images.

This specification provides a transparent display device and a method of driving the same that can improve the perceived transparency of a transparent display through image processing.

The problems to be solved in this specification are not limited to the problems mentioned above, and other problems not mentioned can be clearly understood by those skilled in the art in the technical field to which the technical idea of this specification belongs from the contents below. It could be.

A transparent display device according to some embodiments includes an image processing unit that separates data of an object area and data of a background area from input image data and adjusts the data of the background area within a transparency recognition standard range, and a transparent area and a pixel area. and a display panel that displays data output from the image processor in a pixel area.

A transparent display device according to some embodiments separates data of the object area and data of the background area from an input image, adjusts the luminance of the background area to be within the transparency recognition reference range, and adjusts the luminance of the background area to fit into the object area according to the adjusted luminance of the background area. It may include an image processing unit including a transparent mode that adjusts at least one of luminance and saturation, and a display panel including a transparent area and a pixel area and displaying data output from the image processing unit on the pixel area.

A method of driving a transparent display device according to some embodiments includes the steps of separating data of an object area and data of a background area from input image data, adjusting the luminance of the background area to be within a transparency recognition reference range, and adjusting the adjusted brightness of the background area. adjusting at least one of the luminance and saturation of the object area according to the luminance, and displaying the adjusted data of the background area and the adjusted data of the object area in the pixel area of the display panel including the transparent area and the pixel area. Steps may include.

Specific details according to various examples of this specification other than the means of solving the above-mentioned problems are included in the description and drawings below.

A transparent display device and driving method according to some embodiments separate an object area and a background area from an input image, adjust the luminance of the background area to make it transparent, and adjust at least one of the luminance and saturation of the object area according to a change in the luminance of the background area. By adjusting it, the perceived transparency of the background area can be improved and visibility can be improved by optimizing the color of the object area. As a result, the image quality of the transparent display device can be improved and power consumption can be reduced to achieve a low-power effect.

Figure 1 is a block diagram showing the configuration of a transparent display device according to an embodiment.
Figure 2 is a block diagram showing the configuration of a transparent display device according to an embodiment.
Figure 3 is a diagram schematically showing various pixel arrangement structures in some areas of a display panel according to one embodiment.
Figure 4 is an equivalent circuit diagram showing the configuration of each subpixel according to an embodiment.
Figure 5 is an equivalent circuit diagram showing the configuration of each subpixel according to an embodiment.
Figure 6 is a flowchart showing a method of driving a transparent display device according to an embodiment.
FIG. 7 is a diagram illustrating a method of separating a background area and an object area from an input image in a transparent display device according to an embodiment.
FIG. 8 is a diagram for explaining a method of adjusting luminance of a background area in a transparent display device according to an embodiment.
Figure 9 is a diagram illustrating the result of adjusting the luminance of a background area in a transparent display device according to an embodiment.
FIG. 10 is a diagram for explaining a method of controlling brightness and saturation of an object area in a transparent display device according to an embodiment.
FIG. 11 is a diagram illustrating the results of adjusting luminance of an object area in a transparent display device according to an embodiment.
12 and 13 are diagrams illustrating the transparency of an on-screen image of a transparent display device according to a comparative example and an embodiment.
Figures 14 and 15 are diagrams showing a measurement method and measurement results for determining whether to adjust the luminance of a background area in a transparent display device according to an embodiment.
Figures 16 and 17 are diagrams showing a measurement method and measurement results for determining whether to adjust the luminance of an object area according to a change in luminance of a background area in a transparent display device according to an embodiment.
Figures 18 and 19 are diagrams showing a measurement method and measurement results for determining whether to adjust saturation of an object area according to a change in luminance of a background area in a transparent display device according to an embodiment.

The advantages and features of the present specification and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present specification is not limited to the embodiments disclosed below and will be implemented in various different forms, but the present embodiments only serve to ensure that the disclosure of the present specification is complete, and are common knowledge in the technical field to which the present specification pertains. It is provided to fully inform those who have the scope of the invention, and this specification is only defined by the scope of the claims.

The shape, size, ratio, angle, number, etc. disclosed in the drawings for explaining the embodiments of the present specification are illustrative, and the present specification is not limited to the matters shown. Like reference numerals refer to like elements throughout the specification. Additionally, in describing the present specification, if it is determined that a detailed description of related known technologies may unnecessarily obscure the gist of the present specification, the detailed description will be omitted. When “includes,” “has,” “consists of,” etc. mentioned in the specification are used, other parts may be added unless “only” is used. When a component is expressed in the singular, the plural is included unless specifically stated otherwise.

When analyzing a component, the error range is interpreted to include the error range even if there is no separate explicit description of the error range.

In the case of a description of a positional relationship, for example, if the positional relationship of two parts is described as “on top,” “at the top,” “at the bottom,” “next to,” etc., for example, “right away.” Alternatively, there may be one or more other parts between the two parts, unless "directly" is used.

In the case of a description of a temporal relationship, if a temporal relationship is described as “after,” “sequentially,” “next,” “before,” etc., and it is not continuous unless “immediately” or “directly” is used. It may also be included.

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

In describing the components of this specification, terms such as first, second, A, B, a, and b may be used. These terms are only used to distinguish the component from other components, and the nature, sequence, order, or number of the components are not limited by the term. When a component is described as being “connected,” “coupled,” or “connected” to another component, that component may be connected or connected to that other component directly, but indirectly, unless specifically stated otherwise. It should be understood that other components may be “interposed” between each component that is connected or capable of being connected.

“At least one” should be understood to include any combination of one or more of the associated elements. For example, “at least one of the first, second, and third components” means not only the first, second, or third component, but also two of the first, second, and third components. It can be said to include a combination of all or more components.

Each feature of the various embodiments of the present specification can be combined or combined with each other, partially or entirely, and various technological interconnections and operations are possible, and each embodiment may be implemented independently of each other or together in a related relationship. It may be possible.

Hereinafter, embodiments of the present specification will be examined through the attached drawings and examples. The scale of the components shown in the drawings is different from the actual scale for convenience of explanation, and is therefore not limited to the scale shown in the drawings.

Figures 1 and 2 are block diagrams showing the configuration of a transparent display device according to an embodiment, Figure 3 is a diagram schematically showing various pixel arrangement structures in some areas of a display panel according to an embodiment, and Figures 4 and Figure 5 is an equivalent circuit diagram showing the configuration of each subpixel according to an embodiment.

The display device 1000 according to one embodiment may be a liquid crystal display device or an electroluminescent display device using a self-luminescent device. The electroluminescent display device may be an Organic Light Emitting Diode (OLED) display device, a Quantum-dot Light Emitting Diode display device, or an Inorganic Light Emitting Diode display device. . A micro light emitting diode display device may be applied to the display device 1000 according to one embodiment.

1 and 2, a transparent display device 1000 or 1000A according to an embodiment includes a display panel 100, a gate driver 300, a data driver 400, a timing controller 600, and a gamma voltage generation. It may include a unit 700, power management circuits 800, 800A, etc. The gate driver 300 and data driver 400 may be collectively referred to as the panel driver 200 that drives the display panel 100. The gate driver 300, data driver 400, timing controller 600, and gamma voltage generator 700 may be collectively referred to as the display driver 500.

Referring to FIG. 2, a transparent display device 1000A according to an embodiment includes a light blocking plate 1100 disposed on the back of the display panel 100 overlapping with the display panel 100, and a light blocking plate driver that drives the light blocking plate 1100. (1200) may be additionally included.

Referring to FIGS. 1 and 2, the display panel 100 is a rigid display panel, or a foldable, bendable, rollable, or stretchable display panel. Likewise, it may be a flexible display panel capable of changing shape.

The display panel 100 is a transparent display panel that allows the background located behind the display panel 100 to be seen through the display panel 100. The display panel 100 includes a display area (AA) including a plurality of pixel areas (PA) that display an on-screen image and a plurality of transmission areas (TA) that transmit light. The display panel 100 may be a panel with a built-in or attached touch sensor screen that overlaps the display area AA. The pixel area (PA) can be expressed as a light emitting area. The transmission area (TA) can be expressed as a transparent area.

The display area (AA) of the display panel 100 may include a pixel area (PA) and a transmission area (TA) of various arrangement structures.

For example, the display area AA may include at least one of the unit areas 310, 320, 330, and 340 of various arrangement structures shown in FIG. 3, and may also include unit areas of other arrangement structures. You can. In the display area AA, at least one of various unit areas 310, 320, 330, and 340 may be arranged in a matrix form along the first and second directions. The first direction may be one of the x-axis direction (horizontal direction) and the y-axis direction (vertical direction), and the second direction may be the other direction.

Referring to FIG. 3, the unit area 310 includes a pixel area PA1 where a plurality of subpixels (SP1 to SPk, k is an integer of 2 or more) are arranged, and a transmission area adjacent to the pixel area PA1 in the first direction. It may include an area (TA1). The positions of the pixel area PA1 and the transmission area TA1 in the unit area 310 may be interchanged. Each of the plurality of subpixels (SP1 to SPk) may emit light of any one of red, green, blue, and white. Transmissive area TA1 may have the same size as pixel area PA1 or may have a size smaller or larger than pixel area PA1.

Referring to FIG. 3, the unit area 320 includes a pixel area PA2 and a transparent area TA2 adjacent to the pixel area PA2 in the first, second, and third directions (diagonally). can do. The pixel area PA2 may include a plurality of subpixels SP1 to SPk. The transmission area TA2 may have a size larger than the pixel area PA2.

Referring to FIG. 3, the unit area 330 may include a pixel area PA3 arranged in a cross shape and a transparent area TA3 adjacent to the pixel area PA3 in the first and second directions. . The pixel area PA3 may include a plurality of subpixels SP1 to SPk. The transmission area TA3 may have a size larger than the pixel area PA3.

Referring to FIG. 3, the unit area 340 may include a pixel area PA4 arranged in a diamond shape and a transparent area TA4 surrounding the pixel area PA4. The pixel area PA4 may include a plurality of subpixels SP1 to SPk. The transmission area TA4 may have a size larger than the pixel area PA4.

Each of the plurality of subpixels (SP1 to SPk) may include a light-emitting device and a pixel circuit that independently drives the light-emitting device. The light emitting device may be an organic light emitting diode, a quantum dot light emitting diode, or an inorganic light emitting diode. The pixel circuit may include TFTs of various configurations, including a driving TFT that drives the light emitting element and a switching TFT that transmits a data signal to the driving TFT, and a storage capacitor that stores the driving voltage of the driving TFT. The pixel circuit is electrically connected to signal lines including gate lines, data lines, and power lines disposed on the display panel 100.

The power management circuit (800, 800A) can generate and output various driving voltages necessary for the operation of all components of the transparent display device, that is, the display panel 100 and the display driver 500, using the input voltage supplied from the outside. there is. The power management circuit 800A may further supply the driving voltage required to drive the light blocking plate 1100 and the light blocking plate driver 1200.

The gate driver 300 is controlled according to a plurality of gate control signals supplied from the timing controller 600 and can individually drive the gate lines of the display panel 100. The gate driver 300 may supply a scan signal of the gate-on voltage to the corresponding gate line during the driving period of each gate line, and may supply a gate-off voltage to the corresponding gate line during the non-driving period of each gate line. The gate driver 300 may be built into the bezel area of the display panel 100 in the form of a gate in panel (GIP) formed together with the TFTs of the display area AA.

Meanwhile, the gate driver 300 built into the display panel 100 may receive a plurality of gate control signals from the timing controller 600 via a level shifter (not shown). A level shifter (not shown) may receive control signals from the timing controller 600 and perform level shifting or logic processing to generate a plurality of gate control signals and supply them to the gate driver 200.

The gamma voltage generator 700 generates a plurality of reference gamma voltages having different gamma voltage levels and supplies them to the data driver 400. The gamma voltage generator 700 may generate a plurality of reference gamma voltages corresponding to the gamma characteristics of the display device under the control of the timing controller 600 and supply them to the data driver 400. The gamma voltage generator 700 may adjust the reference gamma voltage level according to the gamma data supplied from the timing controller 600 and output it to the data driver 400. The gamma voltage generator 700 can adjust the high-potential power supply voltage, which is the maximum gamma voltage, according to the peak luminance control from the timing controller 600, and adjusts a plurality of standard reference gamma voltages according to the adjusted high-potential power supply voltage. It can be output to the data driver 400.

The data driver 400 is controlled according to a data control signal supplied from the timing controller 600, and can convert digital data supplied from the timing controller 600 into an analog data signal using a digital-to-analog conversion circuit. The data driver 400 may subdivide the plurality of reference gamma voltages supplied from the gamma voltage generator 700 into gray scale voltages and convert digital data into an analog data signal using the segmented gray scale voltages. The data driver 400 may supply the converted data signal to the data line of the display panel 100.

Additionally, the data driver 400 may supply a reference voltage to the reference line of the display panel 100 under the control of the timing controller 600. The data driver 400 can supply reference voltages for display and sensing according to the control of the timing controller 600.

The data driver 400 can sense a signal reflecting the driving characteristics of each subpixel (SP1 to SPk) through a reference line using a sensing unit under the control of the timing controller 600 using a voltage sensing method or a current sensing method. .

The timing controller 600 may receive source image data and timing control signals from the host system. The host system may be any one of a computer, a TV system, a set-top box, a portable terminal system such as a tablet or mobile phone, or a system inside a car. Timing control signals may include a dot clock, data enable signal, vertical synchronization signal, horizontal synchronization signal, etc.

The timing controller 600 may control the gate driver 300 and the data driver 400 using timing control signals supplied from the host system and timing setting information stored internally. The timing controller 600 may generate a plurality of gate control signals that control the driving timing of the gate driver 300 and supply them to the gate driver 300. The timing controller 600 may generate a plurality of data control signals that control the driving timing of the data driver 400 and supply them to the data driver 400.

The timing controller 600 can perform various image processing, including image quality correction, deterioration correction, and luminance correction to reduce power consumption, on input image data supplied from the host system, and sends the image-processed data to a data driver. It can be supplied as (400).

The timing controller 600 can be expressed as an image processing unit.

The timing controller 600 can separate the input image into a background area and an object area and make it transparent by adjusting the luminance of the background area at a different ratio from the luminance of the object area. The timing controller 600 may further adjust at least one of the luminance and saturation of the object area according to the change in luminance for transparency of the background area.

The timing controller 600 can separate data in the object area and data in the background area from the input image on a frame-by-frame basis through various image analysis.

For example, the timing controller 600 may determine an area where the degree of movement is greater than a threshold during a plurality of image frames as an object area, and determine an area where the degree of motion is less than the threshold as a background area.

The timing controller 600 can make the background area transparent by adjusting the luminance of the separated background area data within the transparency recognition standard range. The timing controller 600 can adjust (convert) the background area data to a level within a standard range perceived as transparency, for example, a 0 to 32 gray scale range. The transparency perception criteria can change depending on the surrounding illumination.

The timing controller 600 may optimize the color of the object area by adjusting at least one of the luminance and saturation of the object area based on the adjusted amount of change in luminance of the background area.

The timing controller 600 may adjust at least one of the luminance and saturation of the background area and the object area depending on the illuminance or color temperature of external light.

The timing controller 600 may receive information on at least one of the illuminance and color temperature of external light from a sensor module (not shown) mounted on the transparent display device 1000 or 1000A.

The timing controller 600 may convert the luminance of the background area into a transparency recognition standard according to the illuminance. The timing controller 600 adjusts the red/green/blue (R/G/B) gradation of the background area differently so that the background area is not perceived as bluish or yellowish depending on the color temperature of the external light. You can further correct the color of the background area.

The above-described image processing function can be separated from the timing controller 600 to form a separate image processing unit, and this image processing unit can be connected to the input terminal of the timing controller 600.

Referring to FIG. 2, the transparent display device 1000A according to one embodiment controls the light transmittance of the light blocking plate 1100 to display an on-screen critical mode and a see-through critical mode. It can operate as . On-screen critical modes may include normal modes for displaying TV images, etc. See-through critical modes may include transparent modes.

The timing controller (image processing unit) 600 can determine an on-screen important mode and a see-through important mode depending on the type of input image.

When in the on-screen critical mode, the timing controller (image processing unit) 600 is driven in normal mode, and the light shield driver 1200 operates in a normal mode under the control of the timing controller (image processing unit) 600. 1100) can be driven in a light blocking mode that displays black. Accordingly, the display panel 100 can improve the visibility of the on-screen image by displaying the on-screen image using the pixel areas (PA) on the black background of the light blocking plate 1100 visible through the transmission portion (TA). there is. In the on-screen critical mode, the timing controller (image processing unit) 600 separates the background area and the object area, adjusts the transparency of the background area, and adjusts the transparency of the background area, and at least one of the luminance and saturation of the object area, as described above. You can turn off the transparency mode that adjusts one thing, that is, adjusts the data in the background area and the data in the object area at different ratios.

In the see-through critical mode, the light blocking plate driver 1200 may drive the light blocking plate 1100 in a transmission mode under the control of the timing controller (image processing unit) 600. Accordingly, the viewer can view the on-screen image displayed by the pixel areas (PA) along with the back background visible through the transparent portion (TA) and the light blocking plate 1100 of the display panel 100.

When in the see-through critical mode, the timing controller (image processing unit) 600 is driven in transparent mode and separates the background area and the object area from the input image as described above, and separates the background area and the object area from the data in the background area and the object area. The data in the area can be adjusted to different ratios.

For example, the timing controller (image processing unit) 600 can improve the transparency of the transparent display device 1000A by lowering the luminance of the background area to the transparency recognition standard and increasing the luminance and saturation of the object area.

Figure 4 is an equivalent circuit diagram showing the configuration of each subpixel according to an embodiment.

Referring to FIG. 4, each subpixel (10A) has a first power line (PW1) that supplies a high-potential driving voltage (EVDD) (first power voltage) and a low-potential driving voltage (EVSS) (second power voltage). ) and the first and second switching TFTs (ST1, ST2) and the driving TFT (DT) to independently drive the light emitting element (EL) connected between the second power line (PW2) that supplies ) and a storage capacitor (Cst).

The light emitting element EL may include an anode connected to the source node N2 of the driving TFT DT, a cathode connected to the second power line PW2, and an organic light emitting layer between the anode and the cathode. The anode is independent for each subpixel, but the cathode may be a common electrode shared by all subpixels. When a driving current is supplied from the driving TFT (DT) to the light emitting element (EL), electrons from the cathode are injected into the organic light emitting layer, and holes from the anode are injected into the organic light emitting layer, resulting in fluorescence or emission due to recombination of electrons and holes in the organic light emitting layer. By emitting light from a phosphorescent material, light with a luminance proportional to the current value of the driving current can be generated.

The first switching TFT (ST1) is driven by the scan gate signal (SCn) supplied from the gate driver 300 to the first gate line (Gn1), and the data supplied to the data line (Dm) from the data driver 400 The voltage (Vdata) can be supplied to the gate node (N1) of the driving TFT (DT).

The second switching TFT (ST2) is driven by the sense gate signal (SEn) supplied from the gate driver 300 to the second gate line (Gn2), and the reference signal supplied from the data driver 400 to the reference line (Rm). The voltage (Vref) can be supplied to the source node (N2) of the driving TFT (DT). Meanwhile, in the sensing mode, the second switching TFT (ST2) may provide a current reflecting the characteristics of the driving TFT (DT) or the characteristics of the light emitting element (EL) to the reference line (Rm).

The first and second switching TFTs (ST1, ST2) may be controlled by different gate lines (Gn1, Gn2), as shown in FIG. 3, or may be controlled by the same gate line.

A storage capacitor (Cst) connected between the gate node (N1) and the source node (N2) of the driving TFT (DT) is connected to the gate node (N1) and the source node (N1) through the first and second switching TFTs (ST1, ST2). The difference voltage between the data voltage (Vdata) and the reference voltage (Vref) respectively supplied to N2) is charged with the driving voltage (Vgs) of the driving TFT (DT), and the first and second switching TFTs (ST1, ST2) are turned off. The charged driving voltage (Vgs) is held during the light emission period.

The driving TFT (DT) can control the light emission intensity of the light emitting device (EL) by controlling the current (Ids) flowing to the light emitting device (EL) according to the driving voltage (Vgs) charged in the storage capacitor (Cst).

In Figure 4, the gate lines (Gn1, Gn2) are driven by the gate driver 300, receive the data voltage (Vdata) and reference voltage (Vref) from the data driver 400, and power management circuits (800, 800A). The high potential driving voltage (EVDD) and the low potential driving voltage (EVSS) can be supplied from.

Figure 5 is an equivalent circuit diagram showing the configuration of each subpixel according to an embodiment.

Referring to FIG. 5, the pixel circuit of each subpixel 10B includes a light emitting element (EL), a driving TFT (DT) that supplies current to the light emitting element (EL), a plurality of TFTs (T1 to T6), and a storage capacitor ( Cst) may be included. The TFTs of each pixel circuit may be TFTs using any one of polysilicon semiconductor, amorphous silicon semiconductor, and oxide semiconductor.

For example, the driving TFT (DT) and the TFTs (T1 to T6) may be composed of a P-type channel polysilicon TFT using polysilicon, which has high mobility.

Meanwhile, the driving TFT (DT) and TFTs (T1~T3, T5-T6) are composed of P-type channel polysilicon TFT, and the compensation TFT (T4) connecting the driving TFT (DT) with a diode structure is made of polysilicon. It can be composed of an N-type channel oxide TFT using an oxide semiconductor with a smaller leakage current. During low-speed operation where the screen update rate is relatively slow, the fourth switching TFT (T4) can prevent flicker by blocking leakage current.

The light emitting element (EL) includes an anode connected to the drain electrode of the driving TFT (DT) through the light emission control TFT (T5), and a cathode connected to the second power electrode 110 that supplies the second power voltage (VSSEL). , an organic light-emitting layer may be provided between the anode and the cathode. The light emitting element (EL) may generate light with a brightness proportional to the current value of the driving current supplied from the driving TFT (DT).

The compensation TFT (T4) is controlled by the first gate line 104 and has a second node (N3) connected to the gate electrode of the driving TFT (DT), and a third node connected to the drain electrode of the driving TFT (DT). (N3) can be connected. The compensation TFT (T4) is turned on by the gate-on voltage of the first gate signal (SC1[n]) supplied through the first gate line 104, and the gate electrode and drain electrode of the driving TFT (DT) are connected to each other. By connecting, the driving TFT (DT) can be connected in a diode structure. The first gate line 104 can be shared by two row lines, the n-1th and nth (n is an integer of 2 or more) row lines, and as a result, it is built into the bezel area of the display panel 100. The size of the gate driver 300 and the bezel size can be reduced.

The switching TFT (T1) is controlled by the second gate line 105 and can connect the data line 102 and the first node (N1) connected to the source electrode of the driving TFT (DT). The switching TFT (T1) is turned on by the gate-on voltage of the second gate signal (SC2[n]) supplied through the second gate line 105, and the data voltage ( Vdata) can be supplied to the source electrode of the driving TFT (DT).

The operation control TFT (T2) is controlled by the emission control line 111 and can connect the first power line (VDDEL) and the first node (N1) connected to the source electrode of the driving TFT (DT). The operation control TFT (T2) is turned on by the gate-on voltage of the emission control signal (EM[n]) supplied through the emission control line 111, and the first voltage supplied through the first power line 103 is turned on. The power supply voltage (EVDD) can be supplied to the source electrode of the driving TFT (DT).

The light emission control TFT (T5) is controlled by the light emission control line 111 and has a third node (N3) connected to the drain electrode of the driving TFT (DT) and a fourth node connected to the anode electrode of the light emitting element (EL). (N4) can be connected. The emission control TFT (T5) is turned on by the gate-on voltage of the emission control signal (EM[n]) supplied through the emission control line 111, and the drain electrode of the driving TFT (DT) and the light emitting element (EL) are turned on. ) can be connected to the anode electrode.

The first initialization TFT (T3) is controlled by the third gate line 106 and can connect the third node (N3) connected to the drain electrode of the driving TFT (DT) with the first initialization line 108. . The first initialization TFT (T3) is turned on by the gate-on voltage of the second gate signal (SC3[n]) supplied through the third gate line 106, and is connected to the drain electrode of the driving TFT (DT). The first initialization voltage Vini supplied through the first initialization line 108 may be supplied to the third node N3.

The second initialization TFT (T6) is controlled by the fourth gate line 107 and can connect the second initialization line 109 and the fourth node (N4) connected to the anode of the light emitting element (EL). The second initialization TFT (T6) is turned on by the gate-on voltage of the fourth gate signal (SC3[n+1]) supplied through the fourth gate line 107, and is connected to the anode electrode of the light emitting device (LED). A second initialization voltage (VAR, anode reset voltage) supplied through the second initialization line 109 may be supplied to the fourth node N4 connected to . The fourth gate line 107 may share a third gate line that supplies the third gate signal SC3[n+1] at the n+1th (n is a positive integer) low line.

The storage capacitor (Cst) may be connected between the first power line 103 and the second node (N2) connected to the gate electrode of the driving TFT (DT). The storage capacitor (Cst) connects the first power voltage (VDDEL) supplied through the first power line 103, the switching TFT (T2), the driving TFT (DT), and the compensation TFT (T1) from the data line 102. The difference voltage with the data voltage (Vdata) supplied to the second node (N2) can be charged. While the driving TFT (DT) is connected to the diode structure through the compensation TFT (T4), the storage capacitor (Cst) can sample and store the threshold voltage (Vth) of the driving TFT (DT). A data voltage (Vdata+Vth) in which the threshold voltage (Vth) is compensated may be provided to the gate electrode. Accordingly, the storage capacitor Cst can charge the difference voltage between the first power voltage VDDEL and the data voltage Vdata for which the threshold voltage Vth of the driving TFT DT is compensated as the target voltage, The charged target voltage can be provided as a driving voltage (Vgs) between the gate and source electrodes of the driving TFT (DT). Accordingly, the difference in characteristics of the driving TFT (DT) between subpixels can be compensated.

The driving TFT (DT) can control the light emission intensity of the light emitting device (EL) by controlling the current (Ids) flowing to the light emitting device (EL) according to the driving voltage charged in the storage capacitor (Cst).

In FIG. 5, the gate lines 104, 105, 106, and 107 may be driven by the gate driver 300, and the emission control line 111 may be driven along with the gate driver 300 in the bezel area of the display panel 100. It can be driven by a light emission control driver (not shown) disposed in . The data voltage (Vdata) is supplied from the data driver 400, and the first power supply voltage (VDDEL), the second power supply voltage (VSSEL), the first initialization voltage (Vini), and the second power supply voltage (VDDEL) are supplied from the power management circuits (800, 800A). Reset voltage (VAR) can be supplied.

FIG. 6 is a flowchart showing a method of driving a transparent display device according to an embodiment, and FIG. 7 is a diagram illustrating a method of separating a background area and an object area from an input image in a transparent display device according to an embodiment. Figures 8 and 9 are diagrams illustrating a method and result of luminance adjustment of a background area in a transparent display device according to an embodiment. Figures 10 and 11 are diagrams illustrating a method of controlling luminance/saturation of an object area and the results of luminance adjustment in a transparent display device according to an embodiment.

The driving method of the transparent display device shown in FIG. 6 will be described with reference to the transparent display device shown in FIGS. 1 and 2.

The timing controller 600 may receive an input image (S602), analyze the input image, and separate data of the object area and data of the background area from each image frame (S610).

For example, the timing controller 600 may calculate the degree of movement by comparing data between the input image frame and the previous image frame (S612) and separate the object area and the background area according to the degree of movement (S614). During a plurality of image frames, the timing controller 600 determines an area in the image where the degree of movement is above the threshold as the object area, and determines an area where the degree of movement is below the threshold as the background area, thereby dividing the object area data and the background area data from the input image. can be separated.

The timing controller 600 can adjust the luminance of the separated background area and object area at different ratios (S620). The timing controller 600 may adjust at least one of the luminance and saturation of the background area and the object area depending on the illuminance or color temperature of external light.

The timing controller 600 can adjust the luminance of the background area to make the background area transparent by converting the data of the separated background area to a level within a standard range (0 to 32 grayscale range) recognized as transparency (S622).

The timing controller 600 may optimize the color of the object area by adjusting at least one of the luminance and saturation of the object area based on the adjusted amount of change in luminance of the background area (S624).

The timing controller 600 may optimize the color of the object area by adjusting at least one of the luminance and saturation of the object area based on the adjusted amount of change in luminance of the background area.

For example, the timing controller 600 can improve the transparency of the transparent display device by lowering the luminance of the background area to the transparency recognition standard and increasing the luminance and saturation of the object area.

FIG. 7 is a diagram illustrating a method of separating a background area and an object area from an input image in a transparent display device according to an embodiment.

Referring to FIG. 7(a), the timing controller 600 may receive an input image in which text ABC moves during a plurality of image frames F1 to Fn.

Referring to FIG. 7(b), the timing controller 600 calculates the degree of movement from the input image, determines the text (ABC) area where the degree of motion (m2) is greater than the threshold as the object area 702, and determines the degree of motion from the input image. An area where the degree (m1) is less than the threshold may be determined as the background area 704.

Referring to FIG. 7(c), the timing controller 600 may separate the object area 702 and the background area 702 from the input image.

FIGS. 8 and 9 are diagrams illustrating a method and result of luminance adjustment of a background area in a transparent display device according to an embodiment, and FIGS. 10 and 11 are diagrams illustrating the luminance of an object area in a transparent display device according to an embodiment. /This is a diagram illustrating the saturation control method and luminance control results.

Referring to Figures 8 (a) and (b), the timing controller 600 converts the luminance (L1, L2) of the background areas (802, 804) with different luminances into output luminance (L1', L2') within the transparency recognition standard. ), the background areas 802 and 804 can be made transparent.

Referring to FIG. 9, when displaying an on-screen image on the transparent display device 1000, the luminance of the object area 904 and the background areas 906 and 908 in the on-screen image are adjusted at different ratios to reduce the background background. The transparency of the background areas 906 and 908 where 902 is visible can be improved. In FIG. 9, it can be seen that the transparency of the background area 906 with the low adjusted luminance (L1') is improved compared to the transparency of the background area 908 with the high adjusted luminance (L2').

Referring to FIGS. 10(a) and 10(b), the timing controller 600 adjusts the luminance and saturation of the object area based on the luminance change amount (F1, F2) of the background area, thereby adjusting the luminance change amount (F1, F2) of the background area. It can be seen that the degree of luminance correction (ΔL1, ΔL2) and saturation correction (ΔS1, ΔS2) of the object area vary depending on F2).

Referring to FIG. 11, when displaying an on-screen image on the transparent display device 1000, the luminance of the object areas 914 and 924 and the background areas 906 and 908 in the on-screen image are adjusted at different ratios. The transparency of the background areas 906 and 908, where the background 902 is visible, can be improved. It can be seen that the degree of luminance correction (ΔL1, ΔL2) of the object areas 914 and 924 varies depending on the amount of change in luminance of the background areas 906 and 908. In FIG. 11, it can be seen that the transparency of the background area 906 with the low adjusted luminance (L1') is improved compared to the transparency of the background area 908 with the high adjusted luminance (L2'). In FIG. 11, it can be seen that the visibility of the object area 924 with the large luminance correction degree ΔL2 is improved compared to the visibility of the object area 914 with the small luminance correction degree ΔL1.

12 and 13 are diagrams illustrating the transparency of an on-screen image of a transparent display device according to a comparative example and an embodiment.

Referring to FIG. 12, an input image 210 including an object area 214 and a background area 212 is supplied, and the transparent display device 1000 is displayed without adjusting the luminance of the background area 212 and the object area 214. When displaying the on-screen image 230, the transparency of the background area 232 of the on-screen image 230, where the background 220 is visible, may be reduced or the visibility of the object area 234 may be reduced. You can see that there is.

Referring to FIG. 13, when an input image 350 including an object area 352 and a background area 354 is supplied and displayed as an on-screen image 360 on the transparent display device 1000, the background By lowering the luminance of the area 362 and increasing the luminance and saturation of the object area 364, the transparency of the background area 362 where the background 220 is visible in the on-screen image 360 is improved, and the object area ( 364), it can be seen that the visibility is improved.

FIGS. 14 and 15 are diagrams showing a measurement method and measurement results for determining whether to adjust the luminance of a background area in a transparent display device according to an embodiment, and FIGS. 16 and 17 are diagrams showing a measurement method and measurement results for determining whether to adjust the luminance of a background area in a transparent display device according to an embodiment. This diagram shows the measurement method and measurement results for determining whether the luminance of an object area is adjusted according to a change in luminance of the area.

Referring to FIGS. 14 and 16, the transparent display device 1000 alternately displays a plurality of test images 410, 420, 430, and 440 supplied to the inspection device 402, and displays the transparent display device 2000 through the measurement device 2000. The luminance (Lout1, Lout2, Lout3, Lout4) of the background areas (514, 524, 534, 544) of the output images (510, 520, 530, and 540) of the display device 1000 can be measured, and the output images (510) , 520, 530, and 540, the luminance (Lout1, Lout2, Lout3, Lout4) of the object areas 516, 526, 536, and 546 can be measured.

The plurality of test images 410, 420, 430, and 440 may have the same luminance of the object area 406, while the luminance of the background areas 414, 424, 434, and 444 may be different from each other.

Referring to FIGS. 14 and 15(b) , when receiving and displaying test images 410, 420, 430, and 440, the transparent display device according to one embodiment may display the background areas 414, 424, 434, and 444. By adjusting the luminance to make it transparent, the measured luminance (Lout1, Lout2, Lout3, Lout4) of the background areas (514, 524, 534, 544) of the output images (510, 520, 530, 540) is changed to the background areas (414, 424, 434, 444) can be seen to change linearly depending on the input luminance (Lin1, Lin2, Lin3, Lin4).

On the other hand, referring to FIG. 15(a), when the test images 410, 420, 430, and 440 are displayed on the transparent display device according to the comparative example, the luminance of the background areas 414, 424, 434, and 444 changes. Even so, the measured luminance (Lout1, Lout2, Lout3, Lout4) of the background area measured through the measurement device 2000 is relative to the input luminance (Lin1, Lin2, Lin3, Lin4) of the background area (414, 424, 434, 444). It can be seen that it has gamma characteristics.

16 and 17(b), when the transparent display device according to one embodiment receives and displays the test images 410, 420, 430, and 440, the background areas 414, 424, 434, and 444 are displayed. By adjusting the luminance to make it transparent and adjusting the luminance of the object area 406 based on the change in luminance of the background area, the object areas 516, 526, 536, and 546 of the output images 510, 520, 530, and 540 are made transparent. It can be seen that the measured luminance (Lout1, Lout2, Lout3, Lout4) changes depending on the input luminance (Lin1, Lin2, Lin3, Lin4) of the background areas (414, 424, 434, and 444).

On the other hand, referring to FIG. 17(a), when the test images 410, 420, 430, and 440 are displayed on the transparent display device according to the comparative example, the luminance of the background areas 414, 424, 434, and 444 changes. Even so, it can be seen that the measured luminance (Lout1, Lout2, Lout3, Lout4) of the object area measured through the measurement device 2000 is the same.

Figures 18 and 19 are diagrams showing a measurement method and measurement results for determining whether to adjust saturation of an object area according to a change in luminance of a background area in a transparent display device according to an embodiment.

Referring to FIG. 18, the transparent display device 1000 alternately displays a plurality of test images 610, 620, 630, and 640 supplied to the inspection device 602, and displays the transparent display device ( The saturation (Sout1, Sout2, Sout3, Sout4) of the object areas (716, 726, 736, 746) of the output images (710, 720, 730, 740) of 1000) can be measured.

The plurality of test images 610, 620, 630, and 640 may have the same luminance and saturation of the object area 606, while the luminance of the background areas 614, 624, 634, and 644 may be different from each other.

Referring to FIGS. 18 and 19(b) , when receiving and displaying test images 610, 620, 630, and 640, the transparent display device according to one embodiment displays the background areas 614, 624, 634, and 644. By adjusting the luminance to make it transparent and adjusting the saturation of the object area 606 based on the change in luminance of the background area, the saturation of (716, 726, 736, 746) of the output images (710, 720, 730, 740) It can be seen that Sout1, Sout2, Sout3, and Sout4 change depending on the input luminance (Lin1, Lin2, Lin3, and Lin4) of the background areas (614, 624, 634, and 644). Additionally, in the output images 710, 720, 730, and 740 of the transparent display device according to one embodiment, the output luminance of the background areas 714, 724, 734, and 744 is equal to that of the background areas 614, 624, 634, and 644. It can be seen that it changes depending on the input luminance (Lin1, Lin2, Lin3, Lin4).

On the other hand, referring to FIG. 19(a), when the test images 610, 620, 630, and 640 are displayed on the transparent display device according to the comparative example, the luminance of the background areas 614, 624, 634, and 644 changes. Even so, it can be seen that the measured saturation (Sout1, Sout2, Sout3, Sout4) of the object area measured through the measuring device 2000 is the same.

As described above, the transparent display device according to some embodiments separates the object area and the background area from the input image, adjusts the luminance of the background area to make it transparent, and changes at least one of the luminance and saturation of the object area according to the change in luminance of the background area. By adjusting one, the perceived transparency of the background area can be improved and the color of the object area can be optimized to improve visibility. As a result, the image quality of the transparent display device can be improved and power consumption can be reduced to achieve a low-power effect.

A transparent display device according to some embodiments includes an image processing unit that separates data of an object area and data of a background area from input image data and adjusts the data of the background area to within a transparency recognition standard range, and a transparent area and a pixel area. and may include a display panel that displays data output from the image processing unit in the pixel area.

The image processor according to some embodiments adjusts the luminance of the background area and the luminance of the object area at different ratios, and the display panel adjusts the luminance of the background area within the transparency recognition reference range by the image processor. Luminance can be displayed.

The image processing unit according to some embodiments further adjusts at least one of the luminance and saturation of the object area based on the amount of change in luminance of the background area, and when the luminance of the background area displayed on the display panel changes, At least one of the luminance and saturation of the object area may change.

A transparent display device according to some embodiments separates data of an object area and data of a background area from input image data, adjusts the luminance of the background area to be within a transparency recognition reference range, and adjusts the luminance of the background area according to the adjusted luminance of the background area. An image processing unit including a transparent mode that adjusts at least one of brightness and saturation of the object area, and a display panel including a transparent area and a pixel area, and displaying data output from the image processing unit on the pixel area. can do.

The image processor according to some embodiments may adjust the luminance of the background area at a rate different from the luminance of the object area.

A display panel according to some embodiments may display data of the background area adjusted to within 0 to 32 gray levels by the image processor.

The image processor according to some embodiments may adjust the luminance of the background area to be lower than the input luminance of the background area.

The image processor according to some embodiments may adjust at least one of the luminance and output saturation of the object area to be higher than at least one of the input luminance and input saturation of the background area.

A transparent display device according to some embodiments further includes a sensing module that senses at least one of the illuminance and color temperature of external light, and based on at least one of the illuminance and color temperature sensed by the sensing module, the image processing unit The brightness of the background area can be adjusted, and at least one of the brightness and saturation of the object area can be adjusted.

In the transparent display device according to some embodiments, when at least one of the sensed illuminance and color temperature changes, the luminance of the background area displayed on the display panel changes, and at least one of the luminance and saturation of the object area changes. changes, and the luminance of the background area may change at a different rate from the luminance of the object area.

A transparent display device according to some embodiments further includes a light blocking plate disposed on a rear surface of the display panel overlapping with the display panel, and a light blocking plate driver that drives the light blocking plate under control of the image processing unit, and includes an on-screen display device. When in the critical mode, the image processor turns off the transparent mode, and the light blocking plate driver drives the light blocking plate in a light blocking mode that provides a black background. When in the see-through critical mode, the image processor turns off the transparent mode. It is driven, and the light blocking plate driver may drive the light blocking plate in a transmission mode.

The image processing unit according to some embodiments may determine the on-screen important mode and the see-through important mode according to the type of the input image data.

A method of driving a transparent display device according to some embodiments includes separating data of an object area and data of a background area from input image data, adjusting the luminance of the background area to be within a transparency recognition reference range, and adjusting at least one of luminance and saturation of the object area according to the adjusted luminance, and providing the adjusted data of the background area and the object area to the pixel area of the display panel including a transmission area and a pixel area. It may include displaying the adjusted data.

The adjusting step according to some embodiments may include adjusting the luminance of the background area at a rate different from the luminance of the object area.

The adjusting step according to some embodiments may include adjusting data in the background area to within 0 to 32 gray levels.

The adjusting step according to some embodiments may include adjusting the luminance of the background area to be lower than the input luminance of the background area.

The adjusting step according to some embodiments may include adjusting at least one of the luminance and output saturation of the object area to be higher than at least one of the input luminance and input saturation of the background area.

A method of driving a transparent display device according to some embodiments further includes the step of sensing at least one of the illuminance and color temperature of external light, and the adjusting step is based on at least one of the sensed illuminance and color temperature, It may include adjusting the brightness of the background area and adjusting at least one of the brightness and saturation of the object area.

In a method of driving a transparent display device according to some embodiments, when at least one of the sensed illuminance and color temperature changes, the luminance of the background area displayed on the display panel changes, and at least one of the luminance and saturation of the object area changes. As either one changes, the luminance of the background area may change at a different rate from the luminance of the object area.

A method of driving a transparent display device according to some embodiments includes determining one of an on-screen important mode and a see-through important mode, and when the see-through important mode is used, an image processing unit disposes a rear surface of the display panel. The method may further include controlling a light blocking plate driver to drive the light blocking plate disposed in a transparent mode, and the image processing unit may be driven in a transparent mode including the separating step and the adjusting step.

A method of driving a transparent display device according to some embodiments includes, when in the on-screen critical mode, the image processing unit turns off the transparent mode, and the light blocking plate driver operates the light blocking plate in a light blocking mode that provides a black background. Additional control steps may be included.

The determining step according to some embodiments may include the image processing unit determining the on-screen important mode and the see-through important mode according to the type of the input image data.

The transparent display device according to the present specification can be applied to various electronic devices. For example, the transparent display device according to the present specification includes a mobile device, a video phone, a smart watch, a watch phone, a wearable device, a foldable device, and a rollable device. (rollable device), bendable device, flexible device, curved device, navigation, vehicle navigation, vehicle display device, television, wallpaper display device, shine ( It can be applied to signage devices, home appliances, etc.

The features, structures, effects, etc. described in the various examples of the present specification described above are included in at least one example of the present specification and are not necessarily limited to only one example. Furthermore, the features, structures, effects, etc. illustrated in at least one example of the present specification can be combined or modified and implemented in other examples by those skilled in the art in the field to which the technical idea of the present specification pertains. Therefore, contents related to such combinations and modifications should be construed as being included in the technical scope or scope of rights of this specification.

The present specification described above is not limited to the above-described embodiments and the accompanying drawings, and it is common in the technical field to which this specification pertains that various substitutions, modifications, and changes are possible without departing from the technical spirit of the present specification. It will be clear to those who have the knowledge of. Therefore, the scope of the present specification is indicated by the claims described below, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present specification.

100: display panel 200: panel driver
300: gate driver 400: data driver
500: Display driver 600: Timing controller
700: Gamma voltage generator 800, 800A: Power management circuit
1000, 1000A: Display device
1100: light blocking plate 1200: light blocking plate driving unit

Claims (23)

an image processing unit that separates data of an object area and data of a background area from input image data, and adjusts the data of the background area to be within a transparency recognition standard range; and
A transparent display device comprising a display panel including a transmission area and a pixel area, and displaying data output from the image processor on the pixel area. In claim 1,
The image processing unit adjusts the luminance of the background area and the luminance of the object area at different ratios,
The display panel is a transparent display device that displays the luminance of the background area adjusted by the image processor to within the transparency recognition reference range. In claim 1,
The display panel is a transparent display device that displays data of the background area adjusted to within 0 to 32 gray levels by the image processor. In claim 1,
The image processing unit further adjusts at least one of luminance and saturation of the object area based on the amount of change in luminance of the background area,
A transparent display device in which when the luminance of the background area displayed on the display panel changes, at least one of the luminance and saturation of the object area changes. Separate the data of the object area and the data of the background area from the input image data, adjust the luminance of the background area within the transparency recognition standard range, and adjust at least one of the luminance and saturation of the object area according to the adjusted luminance of the background area. An image processing unit including a transparency mode for controlling any one; and
A transparent display device comprising a display panel including a transmission area and a pixel area, and displaying data output from the image processor on the pixel area. In claim 5,
The image processing unit adjusts the luminance of the background area at a rate different from the luminance of the object area. In claim 5,
The display panel is a transparent display device that displays data of the background area adjusted to within 0 to 32 gray levels by the image processor. In claim 5,
The image processing unit adjusts the luminance of the background area to be lower than the input luminance of the background area. In claim 5,
The image processing unit adjusts at least one of the luminance and output saturation of the object area to be higher than at least one of the input luminance and input saturation of the background area. In claim 5,
It further includes a sensing module that senses at least one of the illuminance and color temperature of external light,
Based on at least one of illuminance and color temperature sensed by the sensing module, the image processing unit adjusts the luminance of the background area and adjusts at least one of the luminance and saturation of the object area. In claim 10,
When at least one of the sensed illuminance and color temperature changes,
The luminance of the background area displayed on the display panel changes, and at least one of the luminance and saturation of the object area changes,
A transparent display device in which the luminance of the background area changes at a different rate from the luminance of the object area. In claim 5,
a light blocking plate disposed on a rear surface of the display panel overlapping with the display panel; and
further comprising a light-shielding plate driving unit that drives the light-shielding plate under control of the image processing unit,
When in the on-screen critical mode, the image processing unit turns off the transparent mode, and the light blocking plate driver operates the light blocking plate in a light blocking mode that provides a black background,
When in the see-through critical mode, the image processing unit drives in the transparent mode, and the light blocking plate driving unit drives the light blocking plate in the transparent mode. In claim 12,
The image processing unit determines the on-screen important mode and the see-through important mode according to the type of the input image data. Separating object area data and background area data from input image data;
adjusting the luminance of the background area to be within a transparency recognition reference range and adjusting at least one of luminance and saturation of the object area according to the adjusted luminance of the background area; and
A method of driving a transparent display device comprising displaying the adjusted data of the background area and the adjusted data of the object area in the pixel area of a display panel including a transparent area and a pixel area. In claim 14,
The adjustment step is
A method of driving a transparent display device comprising adjusting the luminance of the background area at a rate different from the luminance of the object area. In claim 14,
The adjustment step is
A method of driving a transparent display device comprising adjusting data in the background area to within 0 to 32 gray levels. In claim 14,
The adjustment step is
A method of driving a transparent display device comprising adjusting the luminance of the background area to be lower than the input luminance of the background area. In claim 14,
The adjustment step is
A method of driving a transparent display device comprising adjusting at least one of the luminance and output saturation of the object area to be higher than at least one of the input luminance and input saturation of the background area. In claim 14,
It further includes the step of sensing at least one of the illuminance and color temperature of external light,
The adjustment step is
A method of driving a transparent display device comprising adjusting the luminance of the background area and adjusting at least one of the luminance and saturation of the object area based on at least one of the sensed illuminance and color temperature. In claim 19,
When at least one of the sensed illuminance and color temperature changes,
The luminance of the background area displayed on the display panel changes, and at least one of the luminance and saturation of the object area changes,
A method of driving a transparent display device in which the luminance of the background area changes at a different rate from the luminance of the object area. In claim 14,
determining one of an on-screen critical mode and a see-through critical mode; and
When in the see-through critical mode,
It further includes a step of controlling the light blocking plate driving unit so that the image processing unit drives the light blocking plate disposed on the back of the display panel in a transmission mode,
A method of driving a transparent display device in which the image processing unit is driven in a transparent mode, including the separating step and the adjusting step. In claim 21,
When in the above on-screen critical mode,
The method of driving a transparent display device further includes the step of the image processor controlling the light blocking plate driver to turn off the transparent mode and driving the light blocking plate in a light blocking mode that provides a black background. In claim 21,
The determining step is
A method of driving a transparent display device comprising the step of the image processing unit determining the on-screen important mode and the see-through important mode according to the type of the input image data.

Images