Display device for adjusting black frame insertion in consideration of variable scanning rate

Abstract

This display device comprises: a display including a plurality of pixels; a light-emitting signal generation unit for applying a light-emitting signal to the pixels of the display panel through light-emitting lines; and a controller for controlling a dummy black insertion period associated with a driving voltage of the light-emitting lines such that the pixels are driven at a variable refresh rate (VRR). The controller can control the ratio of second periods corresponding to normal PWM operation cycles disposed between first periods, which are fixed black insertion periods, to third periods, which are the dummy black insertion periods.

Description

A display device that adjusts black frame insertion considering variable refresh rates.

[0001] The present invention relates to a display device that adjusts black frame insertion. More specifically, the present invention relates to a display device that adjusts black frame insertion considering a variable refresh rate.

[0002]

[0003] Display devices, which display diverse information on screens, are a core technology of the information and communication age and are evolving toward thinner, lighter, more portable, and higher performance. Accordingly, display devices that can be manufactured in a lightweight and thin form factor are attracting attention.

[0004] These display devices, which are light-emitting elements, are advantageous in terms of power consumption due to low-voltage operation, and are also excellent in terms of high-speed response speed, high luminous efficiency, viewing angle, and contrast ratio. Therefore, they are being studied as next-generation displays. These display devices display images through multiple subpixels arranged in a matrix. Each of the multiple subpixels includes a light-emitting element and a pixel circuit, such as a plurality of transistors that independently drive the light-emitting element.

[0005] Specific examples of such display devices include liquid crystal displays (LCDs), quantum dot display apparatuses (QDs), field emission display apparatuses (FEDs), and organic light emitting diodes (OLEDs).

[0006] Meanwhile, due to the characteristics of the LCD monitor, black light (back light) with a fixed pulse width is displayed in synchronization with the vertical synchronization signal (Vsync) during the twist section of the liquid crystal (LC).

[0007] In this regard, the purpose of Black Frame Insertion (BFI) is to alleviate the blur effect by turning off the black light during the twist period.

[0008] Black light maintains a constant pulse width due to the variable refresh rate (VRR), which changes the frame frequency. However, the brightness region varies with frequency, making it difficult to maintain a constant brightness even when displaying the same data. This creates a problem: the brightness of the frequency-varying brightness region cannot be maintained constant, resulting in a perceptible difference in brightness.

[0009]

[0010] The purpose of the present invention is to solve the problem that the brightness of a light-emitting area that varies with frequency cannot be maintained constant, so that the difference in brightness can be recognized by the eye.

[0011] An object of the present invention is to provide a display device that adjusts black frame insertion considering a variable injection rate.

[0012]

[0013] A display device for adjusting black frame insertion considering a variable refresh rate according to the present invention comprises a display including a plurality of pixels; a light-emitting signal generating unit for applying a light-emitting signal to the pixels of the display through light-emitting lines; and a controller for receiving synchronization signals of different periods so as to synchronize a frame rate of a graphics card with a vertical refresh rate of the display, and controlling a dummy black insertion duration associated with a driving voltage of the light-emitting lines so that the pixels can be driven at a variable refresh rate (VRR). The controller can control a ratio of second periods corresponding to regular PWM operation periods arranged between first periods, which are fixed black insertion durations, and third periods, which are the dummy black insertion durations.

[0014] According to an embodiment, the controller can adjust black frame insertion so that the ratio of the off sections of the first sections and the third sections that are in an off state is maintained constant compared to the entire sections of the first sections, the second sections, and the third sections.

[0015] According to an embodiment, the controller can adjust the black frame insertion so that, when the period of the synchronization signals decreases, the ratio of the second section, which is a light-emitting section, compared to the entire section in the first region where the third section, the second section, and the first section are sequentially arranged is 20% or more.

[0016] According to an embodiment, the controller can adjust black frame insertion in a second region in which the second section, the first section, and the second section subsequent to the first section are sequentially arranged, such that the second section is controlled to be longer than the first section.

[0017] According to an embodiment, the controller can control the ratio of the second section, which is a light-emitting section, to the entire section in a third area in which the first section, the second section following the first section, and the third section following the second section are sequentially arranged so that the ratio of the second section, which is a light-emitting section, is 20% or more compared to the entire section.

[0018] According to an embodiment, the controller may control the starting point of the first section of the first region of the first light-emitting line to coincide with the rising edge of the synchronization signals, and may control the starting point of the third section of the second light-emitting line, which is the starting point of the second region, to coincide with the end point of the third section of the first region.

[0019] According to an embodiment, the controller can adjust the black frame insertion so that, when the period of the synchronization signals increases, the ratio of the second section, which is a light-emitting section, to the entire section in the first region in which the third section, the second section, and the first section are sequentially arranged is 20% or more.

[0020] According to an embodiment, the controller can control the second section following the first section to be longer than the first section in a second area in which the second section, the first section, and the second section following the first section are sequentially arranged.

[0021] According to an embodiment, the controller can adjust the black frame insertion so that, in a third area in which the first section, the second section following the first section, and the third section following the second section are sequentially arranged, the ratio of the second section, which is a light-emitting section, is 20% or more compared to the entire section.

[0022] According to an embodiment, the controller may control the starting point of the first section of the first region of the first light-emitting line to coincide with the rising edge of the synchronization signals, and may control the starting point of the third section of the first region, which is the starting point of the first region, to coincide with the end point of the third section of the second light-emitting line.

[0023]

[0024] The technical effects of a display device for adjusting black frame insertion considering a variable injection rate according to the present invention can be summarized as follows, but are not limited thereto.

[0025] According to an embodiment, the brightness of the light-emitting area can be kept constant by controlling the ratio of the third sections, which are dummy black insertion sections.

[0026] According to an embodiment, by controlling the ratio of second sections corresponding to regular PWM operation cycles arranged between first sections, which are fixed black insertion sections, and third sections, which are dummy black insertion sections, the brightness of a light-emitting area in a display device having a variable scan rate can be kept constant.

[0027] According to an embodiment, in addition to the BFI section displayed in synchronization with the vertical synchronization signal (Vsync), a dummy black that can be varied according to the frequency is displayed to maintain brightness uniformity and to keep the black on / off ratio constant, thereby minimizing the occurrence of flicker.

[0028] The features and effects of the present invention described above will become more apparent through the following detailed description with reference to the attached drawings, so that a person having ordinary skill in the art to which the present invention pertains can easily implement the technical idea of ​​the present invention.

[0029]

[0030] Figure 1 shows the configuration of a display device that adjusts black frame insertion considering a variable injection rate according to the present invention.

[0031] Figure 2 shows a timing diagram of each light emitting line and a vertical synchronization signal having fixed black insertion durations.

[0032] FIG. 3 shows a timing diagram of each light-emitting line and a vertical synchronization signal having fixed black insertion sections and dummy black insertion sections in a display device that adjusts black frame insertion considering a variable injection rate according to the present invention.

[0033] Figure 4 is an enlarged view of the area where the period decreases in the timing diagram of Figure 3.

[0034] Figure 5 is an enlarged view of the area where the period increases in the timing diagram of Figure 3.

[0035]

[0036] A display device for adjusting black frame insertion according to an embodiment of the present invention is a display device for adjusting black frame insertion considering a variable refresh rate, the display device comprising a display including a plurality of pixels, a light-emitting signal generating unit for applying a light-emitting signal to the pixels of the display through light-emitting lines, and a controller for receiving synchronization signals of different periods so that a frame rate of a graphics card and a vertical refresh rate of the display are synchronized, and controlling a dummy black insertion duration associated with a driving voltage of the light-emitting lines so that the pixels can be driven at a variable refresh rate (VRR), wherein the controller is characterized in that it controls a ratio of second periods corresponding to regular PWM operation periods arranged between first periods which are fixed black insertion durations and third periods which are the dummy black insertion periods.

[0037]

[0038] Specific structural or functional descriptions of embodiments according to the concept of the present invention disclosed in this specification are merely illustrative for the purpose of explaining embodiments according to the concept of the present invention, and embodiments according to the concept of the present invention may be implemented in various forms and are not limited to the embodiments described in this specification.

[0039] Embodiments according to the concept of the present invention may have various modifications and take various forms, and thus, embodiments are illustrated in the drawings and described in detail herein. However, this is not intended to limit embodiments according to the concept of the present invention to specific disclosed forms, but rather includes all modifications, equivalents, or alternatives falling within the spirit and technical scope of the present invention.

[0040] While terms such as "first" or "second" may be used to describe various components, these components should not be limited by these terms. These terms are only intended to distinguish one component from another. For example, a first component may be referred to as a "second component," and similarly, a second component may be referred to as a "first component," without departing from the scope of the present invention.

[0041] When a component is referred to as being "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but that there may be other components in between. Conversely, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between. Other expressions that describe the relationship between components, such as "between" and "directly between" or "adjacent to" and "directly adjacent to", should be interpreted similarly.

[0042] The terminology used herein is merely used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this specification, it should be understood that the terms "comprises" or "has" indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in this specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0043] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

[0044] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings attached to this specification. In this regard, FIG. 1 illustrates the configuration of a display device that adjusts black frame insertion considering a variable injection rate according to the present invention.

[0045] Referring to FIG. 1, a display device (10) may include a display (100) including a plurality of pixels, a controller (200), and a light-emitting signal generation unit (300) that supplies a light-emitting signal to each of the plurality of pixels. The display device (10) includes a gate driver (400) that supplies a gate signal to each of the plurality of pixels, a data driver (500) that supplies a data signal to each of the plurality of pixels, and a bias driver (600).

[0046] The controller (200) processes image data (RGB) input from the outside to be appropriate for the size and resolution of the display (100) and supplies the data driving unit (500). The controller (200) generates a plurality of gate, data, and emission control signals (GCS, DCS, ECS) using synchronization signals (SYNC) input from the outside, for example, a dot clock signal (CLK), a data enable signal (DE), a horizontal synchronization signal (Hsync), and a vertical synchronization signal (Vsync). By supplying the generated plurality of gate, data, and emission control signals (GCS, DCS, ECS) to the gate driving unit (400), the data driving unit (500), and the emission signal generating unit (300), the gate driving unit (400), the data driving unit (500), and the emission signal generating unit (300) are controlled.

[0047] The controller (200) may be configured to be combined with various processors, such as a microprocessor, a mobile processor, an application processor, etc., depending on the device to be mounted.

[0048] The controller (200) generates signals so that the pixels can be driven at various refresh rates. That is, the controller (200) generates signals related to driving so that the pixels can be driven in a variable refresh rate (VRR) mode or switchably between a first refresh rate and a second refresh rate. For example, the controller (200) can drive the pixels at various refresh rates by simply changing the speed of a clock signal, generating a synchronization signal to generate a horizontal blank or a vertical blank, or driving the gate driver (400) in a mask manner.

[0049] Each of the plurality of pixels (P) can be driven by a combination of refresh frames and reset frames within a single frame, depending on the refresh rate. For example, when driven at a refresh rate of 120 Hz, the pixels can be driven solely by refresh frames, and when driven at a refresh rate of 10 Hz, the refresh frames and reset frames can be driven alternately. In other words, a single refresh frame and multiple reset frames can be configured as a set and driven repeatedly within a single frame.

[0050] In addition, the controller (200) generates various signals for driving the pixel at the first refresh rate, and in particular, when driven at the first refresh rate, the controller generates an emission control signal (ECS) so that the emission signal generation unit (300) generates an emission signal (EM(N)) having a first duty ratio. Thereafter, the controller (200) operates to drive the pixel at the second refresh rate, and for this purpose, generates various signals for driving at the second refresh rate, and in particular, when driven at the second refresh rate, the controller generates an emission control signal (ECS) so that the emission signal generation unit (300) generates an emission signal (EM(N)) having a second duty ratio different from the first duty ratio.

[0051] The gate driver (400) supplies a scan signal (SC(n)) to the gate line (GL) according to the gate control signal (GCS) supplied from the controller (200). In FIG. 1, the gate driver (400) is illustrated as being spaced apart from one side of the display (100), but the number and arrangement positions of the gate driver (400) are not limited thereto. That is, the gate driver (400) may be arranged on one side or both sides of the display (100) in a GIP (Gate In Panel) manner.

[0052] The data driving unit (500) converts image data (RGB) into data voltage (Vdata) according to a data control signal (DCS) supplied from the controller (200), and supplies the converted data voltage (Vdata) to the pixel through a data line (DL).

[0053] In the display (100), a plurality of gate lines (GL), a plurality of light-emitting lines (EL), and a plurality of data lines (DL) intersect each other, and a plurality of pixels are each connected to the gate lines (GL), the light-emitting lines (EL), and the data lines (DL). Specifically, one pixel receives a gate signal from the gate driver (400) through the gate lines (GL), a data signal from the data driver (500) through the data lines (DL), a light-emitting signal (EM(N)) through the light-emitting lines (EL), and receives various powers through power supply lines. Here, the gate lines (GL) supply a scan signal (SC(n)), the light-emitting lines (EL) supply a light-emitting signal (EM(N)), and the data lines (DL) supply a data voltage (Vdata). However, according to various embodiments, the gate lines (GL) may include a plurality of scan signal lines, and the data lines (DL) or the gate lines (GL) may additionally include a plurality of power supply lines (VL). In addition, the light emitting line (EL) may also include multiple light emitting signal lines. In addition, one pixel receives a high potential voltage (ELVDD) and a low potential voltage (ELVSS). In addition, a first bias voltage (V1) and a second bias voltage (V2) may be supplied through multiple power supply lines (VL). The first bias voltage (V1) may be supplied from a bias driving unit (600).

[0054] Meanwhile, Fig. 2 shows a timing diagram of each light-emitting line having a fixed black insertion duration and a vertical synchronization signal. Referring to Fig. 2, the vertical synchronization signal (Vsync) has variable periods of a first period, a second period, and a third period, thereby enabling a variable refresh rate of the display.

[0055] Meanwhile, referring to the timing diagram of the driving voltage of the first to nth light-emitting lines, fixed black insertion durations, during which black light is turned off, can be arranged in fixed cycles at different time intervals. In this regard, due to the characteristics of the LCD monitor, black light (back light) with a fixed pulse width is displayed in synchronization with the vertical synchronization signal (Vsync) during the twist period of the liquid crystal (LC).

[0056] In this regard, the purpose of Black Frame Insertion (BFI) is to alleviate the blur effect by turning off the black light during the twist section. With a variable refresh rate (VRR) where the frequency of the frame changes, the black light has the same pulse width. On the other hand, there is a problem that the brightness of the emission area varies depending on the frequency, so the brightness cannot be maintained constant even when displaying the same data. There is a problem that the brightness of the emission area that varies depending on the frequency cannot be maintained constant, so the difference in brightness can be perceived by the eye.

[0057] To solve these problems, a display device and a control method thereof for adjusting black frame insertion considering a variable refresh rate according to the present invention are described. In this regard, Fig. 3 shows a timing diagram of each light-emitting line having a fixed black insertion period and a dummy black insertion period and a vertical synchronization signal in a display device for adjusting black frame insertion considering a variable refresh rate according to the present invention. Referring to Fig. 3, a vertical synchronization signal (Vsync) can have variable periods of a first period, a second period, and a third period to implement a variable refresh rate of a display.

[0058] Meanwhile, Fig. 4 is an enlarged view of an area where the period decreases in the timing diagram of Fig. 3. Fig. 5 is an enlarged view of an area where the period increases in the timing diagram of Fig. 3.

[0059] Referring to FIGS. 3 to 5, fixed black insertion sections in which black light is turned off in the first to nth light emitting lines can be arranged at fixed cycles in different time sections. In this regard, the brightness of the light emitting region can be kept constant by controlling the ratio of the third sections, which are dummy black insertion sections associated with the driving voltages of the light emitting lines. In addition, the brightness of the light emitting region can be kept constant in a display device having a variable scan rate by controlling the ratio of the second sections corresponding to regular PWM operation cycles arranged between the first sections, which are fixed black insertion sections, and the third sections, which are dummy black insertion sections.

[0060] A display device for adjusting black frame insertion considering a variable injection rate according to the present invention will be described with reference to FIGS. 1, 3, and 5. The display device (10) may be configured to include a display (100), a controller (200), and a light-emitting signal generating unit (300).

[0061] The display (100) may include a plurality of pixels and may be configured to display colors as the pixels emit light. The light-emitting signal generating unit (300) may be configured to apply a light-emitting signal to the pixels of the display (100) through light-emitting lines.

[0062] The controller (200) may be configured to receive synchronization signals of different cycles so that the frame rate of the graphics card and the vertical scan rate of the display (100) are synchronized. Meanwhile, the controller (200) may control a dummy black insertion duration associated with the driving voltage of the light-emitting lines so that the pixels can be driven at a variable refresh rate (VRR).

[0063] In this regard, the controller (200) generates various signals for driving the pixel at a first refresh rate, and in particular, when driven at the first refresh rate, generates a light emission control signal (ECS) so that the light emission signal generation unit (300) generates a light emission signal (EM(N)) having a first duty ratio. Thereafter, the controller (200) operates to drive the pixel at a second refresh rate, and for this purpose, generates various signals for driving at the second refresh rate, and in particular, when driven at the second refresh rate, generates a light emission control signal (ECS) so that the light emission signal generation unit (300) generates a light emission signal (EM(N)) having a second duty ratio different from the first duty ratio.

[0064] Meanwhile, the controller (200) is not limited to generating the light emitting signal (EM(N)) of the light emitting signal generating unit (300), and may also control a control signal or data signal to multiple lines of the gate driving unit (400) or data driving unit (500) depending on the application.

[0065] The controller (200) can control the ratio of second periods corresponding to regular PWM operation periods arranged between first periods, which are fixed black insertion durations, and third periods, which are dummy black insertion durations.

[0066] The controller (200) can control the ratio of the off sections of the first sections and the third sections that are in an off state to the entire sections of the first sections, the second sections, and the third sections to be maintained constant.

[0067] When the period of the synchronization signals decreases, the controller (200) can control the driving voltage of the light-emitting signal generating unit (300) to maintain the on / off duty ratio constant. In this regard, when the period of the synchronization signals decreases, the controller (200) can control the ratio of the second section (c), which is the light-emitting section, to be 20% or more compared to the entire section in the first area (A) in which the third section (d), the second section (c), and the first section (d') are sequentially arranged. In this regard, the ratio of the light-emitting section to the entire section is not limited to 20%, but can be varied depending on the application for maintaining brightness.

[0068] The controller (200) can control the second section (c) to be longer than the first section (d') in the second area (B) in which the second section (c), the first section (d'), and the second section (c') subsequent to the first section (d') are sequentially arranged.

[0069] The controller (200) can control the ratio of the second section (c'), which is a light-emitting section, to be 20% or more compared to the entire section in the third area (C) in which the first section (d'), the second section (c') following the first section (d'), and the third section (d”) following the second section (c') are sequentially arranged. In this regard, the ratio of the light-emitting section to the entire section is not limited to 20%, but can be varied depending on the application for maintaining brightness.

[0070] In summary, the pulse widths of the fixed black insertion period, the light emission period, and the dummy black insertion period at the boundary where the period of the synchronization signals decreases (or the frequency increases) can be controlled to satisfy the following mathematical expression 1.

[0071]

[0072] Therefore, the proposed design method can minimize flicker occurrence by maintaining brightness uniformity and keeping the black on / off ratio constant by displaying a dummy black that can be varied according to frequency in addition to the BFI section that is displayed in synchronization with the vertical synchronization signal (Vsync).

[0073] Meanwhile, the controller (200) can control the starting point of the first section (d') of the first region (A) of the first light-emitting line to coincide with the rising edge of the synchronization signals. In addition, the controller (200) can control the starting point of the third section of the second light-emitting line, which is the starting point of the second region (B), to coincide with the end point of the third section (d) of the first region (A).

[0074] When the period of the synchronization signals increases, the controller (200) can control the driving voltage of the light-emitting signal generating unit (300) to keep the on / off duty ratio constant. In this regard, when the period of the synchronization signals increases, the controller (200) can control the ratio of the second section (c), which is the light-emitting section, to be 20% or more compared to the entire section in the first area (A) where the third section (d), the second section (c), and the first section (d') are sequentially arranged.

[0075] The controller (200) can control the second section (c) following the first section (d') to be longer than the first section (d') in the second area (B) in which the second section (c), the first section (d'), and the second section (c') following the first section (d') are sequentially arranged.

[0076] The controller (200) can control the ratio of the second section (c'), which is a light-emitting section, to be 20% or more compared to the entire section in the third area (C) in which the first section (d'), the second section (c') following the first section (d'), and the third section (d”) following the second section (c') are sequentially arranged. In this regard, the ratio of the light-emitting section to the entire section is not limited to 20%, but can be varied depending on the application for maintaining brightness.

[0077] In summary, the pulse widths of the fixed black insertion period, the light emission period, and the dummy black insertion period at the boundary where the period of the synchronization signals decreases (or the frequency increases) can be controlled to satisfy the following mathematical expression 2.

[0078]

[0079] Therefore, the proposed design method can minimize flicker occurrence by maintaining brightness uniformity and keeping the black on / off ratio constant by displaying a dummy black that can be varied according to frequency in addition to the BFI section that is displayed in synchronization with the vertical synchronization signal (Vsync).

[0080] Meanwhile, the controller (200) can control the starting point of the first section (d') of the first area (A) of the first light-emitting line to coincide with the rising edge of the synchronization signals. In addition, the controller (200) can control the starting point of the third section (d), which is the starting point of the first area (A), to coincide with the end point of the third section of the second light-emitting line.

[0081] The above has described a display device that adjusts black frame insertion considering a variable refresh rate according to the present invention. The technical effects of the display device that adjusts black frame insertion considering a variable refresh rate according to the present invention can be summarized as follows, but are not limited thereto.

[0082] The technical effects of a display device for adjusting black frame insertion considering a variable injection rate according to the present invention can be summarized as follows, but are not limited thereto.

[0083] According to an embodiment, the brightness of the light-emitting area can be kept constant by controlling the ratio of the third sections, which are dummy black insertion sections.

[0084] According to an embodiment, by controlling the ratio of second sections corresponding to regular PWM operation cycles arranged between first sections, which are fixed black insertion sections, and third sections, which are dummy black insertion sections, the brightness of a light-emitting area in a display device having a variable scan rate can be kept constant.

[0085] According to an embodiment, in addition to the BFI section displayed in synchronization with the vertical synchronization signal (Vsync), a dummy black that can be varied according to the frequency is displayed to maintain brightness uniformity and to keep the black on / off ratio constant, thereby minimizing the occurrence of flicker.

[0086] The features and effects of the present invention described above will become more apparent through the following detailed description with reference to the attached drawings, so that a person having ordinary skill in the art to which the present invention pertains can easily implement the technical idea of ​​the present invention.

[0087] Further scope of the applicability of the present invention will become apparent from the detailed description below. However, since various modifications and variations within the spirit and scope of the present invention will become apparent to those skilled in the art, it should be understood that the detailed description and specific examples, such as preferred embodiments of the present invention, are given by way of example only.

[0088] The present invention is susceptible to various modifications and embodiments. Specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, but rather to encompass all modifications, equivalents, and alternatives falling within the spirit and technical scope of the present invention.

Claims

1. In a display device that adjusts black frame insertion considering a variable injection rate, A display comprising multiple pixels; A light emitting signal generating unit that applies a light emitting signal to the pixels of the display through light emitting lines; and A controller for receiving synchronization signals of different cycles so that the frame rate of the graphics card and the vertical refresh rate of the display are synchronized, and controlling a dummy black insertion duration associated with the driving voltage of the light-emitting lines so that the pixels can be driven at a variable refresh rate (VRR), The above controller, A display device for adjusting black frame insertion, which controls the ratio of second periods corresponding to regular PWM operation periods arranged between first periods, which are fixed black insertion durations, and third periods, which are dummy black insertion durations.

2. In paragraph 1, The above controller, A display device that adjusts black frame insertion, wherein the ratio of the off sections of the first sections and the third sections that are in an off state is controlled to be maintained constant compared to the entire sections of the first sections, the second sections, and the third sections.

3. In paragraph 1, The above controller, A display device that adjusts black frame insertion, wherein when the cycle of the above-mentioned synchronization signals decreases, the ratio of the second section, which is a light-emitting section, to the entire section in the first region in which the third section, the second section, and the first section are sequentially arranged is controlled to be 20% or more.

4. In paragraph 3, The above controller, A display device for adjusting black frame insertion, wherein the second section, the first section, and the second section subsequent to the first section are sequentially arranged in a second area, and the second section is controlled to be longer than the first section.

5. In paragraph 3, The above controller, A display device that adjusts black frame insertion, wherein the ratio of the second section, which is a light-emitting section, is controlled to be 20% or more compared to the entire section in a third area in which the first section, the second section following the first section, and the third section following the second section are sequentially arranged.

6. In paragraph 3, The above controller, Controlling so that the starting point of the third section of the first region of the first light-emitting line coincides with the rising edge of the above-mentioned synchronization signals, A display device that controls the end point of the third section of the first region, which is the starting point of the second region, to coincide with the starting point of the third section of the second light-emitting line.

7. In paragraph 1, The above controller, A display device that adjusts black frame insertion so that, when the cycle of the above-mentioned synchronization signals increases, the ratio of the second section, which is a light-emitting section, compared to the entire section in the first area where the third section, the second section, and the first section are sequentially arranged is controlled to be 20% or more.

8. In paragraph 7, The above controller, A display device for adjusting black frame insertion, wherein the second section, the first section, and the second section subsequent to the first section are sequentially arranged in a second area, and the second section is controlled to be longer than the first section.

9. In paragraph 8, The above controller, A display device that adjusts black frame insertion, wherein the ratio of the second section, which is a light-emitting section, is controlled to be 20% or more compared to the entire section in a third area in which the first section, the second section following the first section, and the third section following the second section are sequentially arranged.

10. In paragraph 7, The above controller, Controlling so that the starting point of the third section of the first region of the first light-emitting line coincides with the rising edge of the above-mentioned synchronization signals, A display device that controls the starting point of the third section of the first region, which is the starting point of the first region, to coincide with the ending point of the third section of the second light-emitting line.

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