Display device

Abstract

A display device includes a pixel portion including pixels connected to data lines and scan lines; a data driver configured on one side of the pixel portion to drive the data lines; a scan driver configured on the one side of the pixel portion together with the data driver to drive the scan lines; and a control portion that controls a slew rate and an output timing of a data signal output to the data lines based on a load of the scan lines and a load of the data lines. The scan lines each include a main scan line extending in a first direction and connected to pixels of a corresponding pixel row, a first sub scan line extending in a second direction different from the first direction and connected to the main scan line at a first contact point, and a second sub scan line extending in the second direction and connected to the main scan line at a second contact point.

Description

Technical Field

[0001] This invention relates to an electronic device, and more specifically to a display device. Background Technology

[0002] Typically, display devices have a structure where a scan drive unit is arranged on one side of the pixel section and a data drive unit is arranged on the other side. Recently, structures for display devices that minimize the non-display area on both sides of the display device are being developed. For example, to achieve a narrow bezel, panels using a single-side driving method, where the scan drive unit and the data drive unit are arranged together on one side, are being investigated.

[0003] In display devices using this single-sided driving method, the lengths of the scan lines are formed differently from one another. Due to this wiring structure, the RC load corresponding to each position of the pixel is uneven. The timing of the scan signal and data signal supplied to each pixel is out of sync, resulting in a deviation in the data charging rate, which may reduce the display quality. Summary of the Invention

[0004] One object of the present invention is to provide a display device that adjusts the slew rate of a data signal based on the load according to the position of the scan line and / or data line.

[0005] Another object of the present invention is to provide a display device that adjusts the output timing of a data signal based on the load according to the position of the scan line and / or data line.

[0006] However, the purpose of this invention is not limited to the above-described purpose, and various extensions can be made without departing from the concept and scope of this invention.

[0007] To achieve an objective of the present invention, a display device according to an embodiment of the present invention may include: a pixel unit including pixels connected to data lines and scan lines; a data driving unit disposed on one side of the pixel unit to drive the data lines; a scan driving unit disposed together with the data driving unit on the same side of the pixel unit to drive the scan lines; and a control unit controlling the slew rate and output timing of the data signal output to the data lines based on the load of the scan lines and the load of the data lines. Each scan line may include: a main scan line extending in a first direction and connected to a pixel in a corresponding pixel row; a first sub-scan line extending in a second direction different from the first direction and connected to the main scan line at a first contact point; and a second sub-scan line extending in the second direction and connected to the main scan line at a second contact point.

[0008] According to one embodiment, the control unit may adjust the overdrive pulse of the data signal according to the scan line in the scan line to which the scan signal is supplied.

[0009] According to one embodiment, for the same color level, the width of the overdrive pulse of the data signal supplied to the first pixel row corresponding to the first scan line may be smaller than the width of the overdrive pulse of the data signal supplied to the second pixel row corresponding to the second scan line. Alternatively, the main scan line of the first scan line and the first pixel row may be closer to the data driving unit than the main scan line of the second scan line and the second pixel row.

[0010] According to one embodiment, for the same color level, the height of the overdrive pulse of the data signal supplied to the first pixel row corresponding to the first scan line may be less than the height of the overdrive pulse of the data signal supplied to the second pixel row corresponding to the second scan line. Alternatively, the main scan line of the first scan line and the first pixel row may be closer to the data driving unit than the main scan line of the second scan line and the second pixel row.

[0011] According to one embodiment, the control unit may increase at least one of the width and height of the overdrive pulse as the load on the data line increases.

[0012] According to one embodiment, at least one of the width of the overdrive pulse and the size of the overdrive pulse may increase as the main scan line supplied with the scan signal moves away from the data driving unit.

[0013] According to one embodiment, the control unit may adjust the output timing of the data signal for each scan line based on the position of the object pixel connected to the main scan line in the first direction.

[0014] According to one embodiment, the control unit may adjust the output timing of the data signal based on the distance between the object pixel and the first contact and the distance between the object pixel and the second contact.

[0015] According to one embodiment, for the same color level, the data signal supplied to the first pixel connected to the first position of the main scan line may be output later than the data signal supplied to the second pixel connected to the second position of the main scan line and the data signal supplied to the third pixel connected to the third position of the main scan line. Alternatively, the first position of the main scan line may correspond to the midpoint between the first and second contacts, the second position of the main scan line may be closer to the first contact than the first position, and the third position of the main scan line may be closer to the second contact than the first position.

[0016] According to one embodiment, when the scan signal is supplied to the main scan line, the timing of the output of the data signal for the same color level may increase as the data line moves closer to the first contact or the second contact from the first pixel.

[0017] According to one embodiment, when the scan signal is supplied to the main scan line, the timing of the output of the data signal for the same color level to the data line connected to the pixel on the left side of the first contact point, which is opposite to the first position, is further delayed as it moves away from the first contact point.

[0018] According to one embodiment, when the scan signal is supplied to the main scan line, the timing of the output of the data signal for the same color level to the data line connected to the pixel on the right side of the second contact, which is opposite to the first position, is further delayed as it moves away from the second contact.

[0019] According to one embodiment, the control unit may delay the output timing of the data signal as the load in the main scan line increases.

[0020] According to one embodiment, the lengths of the first sub-scan line and the second sub-scan line gradually increase as they move in a first direction.

[0021] According to one embodiment, the data driving unit may include: a latch unit for latching image data and outputting it in pixel row units; a digital-to-analog converter for converting the latched image data into the data signal; and an output buffer for outputting the data signal to the data line.

[0022] According to one embodiment, the control unit may include: a memory storing overdrive values ​​and shift values ​​corresponding to preset points of the pixel unit; a slew rate control unit generating an overdrive pulse for the data signal supplied to the object pixel based on the position of the main scan line of the connected object pixel and the overdrive value; and a latch control unit controlling the output timing of the image data of the latch unit based on the position of the object pixel in the main scan line and the shift value.

[0023] According to one embodiment, the control unit may adjust the bias voltage supplied to the output buffer according to the scan line of the scan line to which the scan signal is supplied.

[0024] According to one embodiment, the control unit may include: a memory storing bias values ​​and shift values ​​corresponding to preset points of the pixel unit; a slew rate control unit adjusting the bias voltage supplied to the output buffer corresponding to the object pixel based on the position of the main scan line of the connected object pixel and the bias value; and a latch control unit controlling the output timing of the image data of the latch unit based on the position of the object pixel in the main scan line and the shift value.

[0025] According to one embodiment, the control unit may increase the bias voltage as the load on the data line increases.

[0026] According to one embodiment, the control unit may adjust the overdrive pulse of the data signal according to the scan line in the scan line to which the scan signal is supplied, and adjust the output timing of the data signal according to the position of the object pixel connected to the main scan line of the scan line to which the scan signal is supplied in the first direction.

[0027] (Invention Effects)

[0028] The display device according to an embodiment of the present invention can take into account the scan load (RC load of the scan line) and the data load (RC load of the data line) in the single-sided driving mode, and control the slew rate of the data signal and / or the output timing (output delay time) of the data signal according to the different positions of the pixels within the pixel unit 100. Therefore, the charging rate deviation of the pixel data signal can be reduced and the display quality can be improved.

[0029] However, the effects of the present invention are not limited to those described above, and various extensions can be made without departing from the concept and scope of the present invention. Attached Figure Description

[0030] Figure 1 This is a block diagram illustrating a display device according to an embodiment of the present invention.

[0031] Figure 2 It indicates that the connection is included in Figure 1 A diagram illustrating an example of the scan lines of pixel rows and data lines in a display device.

[0032] Figure 3a It shows the direction Figure 2 A timing diagram illustrating the delay time of the data signal supplied to the pixels in a pixel row.

[0033] Figure 3b It shows the direction Figure 2 Another example of a timing diagram showing the delay time of the data signal supply for the pixel row of pixels.

[0034] Figure 4 It is a brief illustration of what is included. Figure 1 An example of a pixel section in a display device.

[0035] Figure 5 It shows the direction Figure 4 The timing diagram shows an example of overdrive driving of the data signal supplied by the pixel column of the pixel section.

[0036] Figure 6 It is shown that it includes Figure 1 A block diagram of an example of a data driving unit and a control unit in a display device.

[0037] Figure 7 It is used for explanation Figure 6 A diagram showing the operation of the control unit.

[0038] Figures 8a to 8d It is shown Figure 6 A diagram illustrating an example of the operation of the control unit.

[0039] Figure 9a It is used for explanation Figure 6 A block diagram of another example of the control unit.

[0040] Figure 9b It is shown that it includes Figure 9a A diagram illustrating an example of the structure of a portion of the slewing rate control section within the control unit.

[0041] Figure 10 It is used to explain the basis Figure 9b The diagram shows an example of the bias voltage output of the slew rate control unit. Detailed Implementation

[0042] Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings. The same reference numerals are used for the same components in the drawings, and repeated descriptions of the same components are omitted.

[0043] Figure 1 This is a block diagram illustrating a display device according to an embodiment of the present invention.

[0044] Reference Figure 1 The display device 1000 may include a pixel unit 100, a scan driving unit 200, a data driving unit 300, and a control unit 400.

[0045] The display device 1000 can be implemented as a self-emissive display device that includes multiple self-emissive elements. For example, the display device 1000 can be an organic light-emitting display device that includes organic light-emitting elements or a display device that includes inorganic light-emitting elements. However, this is exemplary, and the display device 1000 can also be implemented as a liquid crystal display device, a plasma display device, a quantum dot display device, etc.

[0046] The display device 1000 can be a flat panel display device, a flexible display device, a curved display device, a foldable display device, or a bendable display device. Furthermore, the display device 1000 can be applied to transparent display devices, head-mounted display devices, wearable display devices, etc.

[0047] The pixel unit 100 may include a plurality of pixels PX connected to the scan line S and the data line D. The display device 1000 according to this embodiment is a single-side driving display device 1000 in which the data driving unit 300 and the scan driving unit 200 are together disposed on one side of the pixel unit 100. For single-side driving, each scan line S may include a main scan line SM, a first sub-scan line SS1, and a second sub-scan line SS2.

[0048] The main scan line SM can extend in the first direction DR1 and connect to the pixel PX in its corresponding pixel row. Scan signals can be supplied to the pixel PX through the main scan line SM. That is, each main scan line SM can define a pixel row.

[0049] The first sub-scan line SS1 can extend in the second direction DR2 and connect with the main scan line SM at the first contact CP1. The second sub-scan line SS2 can extend in the second direction DR2 and connect with the main scan line SM at the second contact CP2. In one embodiment, the second direction DR2 can correspond to the pixel column direction.

[0050] The first sub-scan line SS1 and the second sub-scan line SS2 can electrically connect the scan drive unit 200 and the main scan line SM. When a single sub-scan line is connected to the main scan line SM, the RC load (RC delay) deviation between the portion near the contact and the portion far from the contact may become larger. To reduce such RC load deviation, the main scan line SM can be connected to the first sub-scan line SS1 and the second sub-scan line SS2 separated from the first sub-scan line SS1. That is, a scan signal is supplied to the main scan line SM through the first contact CP1 and the second contact CP2, thereby relatively reducing the RC load deviation at each position within the main scan line SM.

[0051] In one embodiment, the first sub-scan line SS1 may be connected one-to-one with the main scan line SM, and the second sub-scan line SS2 may also be connected one-to-one with the main scan line SM. For example... Figure 1 As shown, the first sub-scan line SS1 and the second sub-scan line SS2 can be arranged such that their lengths gradually increase as they move toward the first direction DR1.

[0052] Data line D can be connected to pixel PX in pixel column units.

[0053] The scan drive unit 200 can receive a first control signal SCS from the control unit 400. In response to the first control signal SCS, the scan drive unit 200 can supply a scan signal to the scan line S, including the i-th scan line Si. The first control signal SCS may include a scan start signal for the scan signal and multiple clock signals.

[0054] The scan signal can be set to a gate on-level (low voltage or high voltage) that corresponds to the type of transistor to which the corresponding scan signal is supplied.

[0055] The data drive unit 300 can receive a second control signal DCS from the control unit 400. In response to the second control signal DCS, the data drive unit 300 can convert image data RGB into an analog data signal (data voltage) and supply the data signal to the data line D. Furthermore, the slew rate and / or output timing of the data signal output from the data drive unit 300 can be adjusted under the control of the control unit 400.

[0056] The control unit 400 can receive input control signals CON and input image data IDATA from an external image source such as a graphics device. Based on the input image data IDATA, the control unit 400 can generate image data RGB that matches the operation conditions of the pixel unit 100 and provide it to the data driver unit 300.

[0057] In one embodiment, the control unit 400 may generate a first control signal SCS for controlling the driving timing of the scan drive unit 200 and a second control signal DCS for controlling the driving timing of the data drive unit 300 based on the input control signal CON, and provide them to the scan drive unit 200 and the data drive unit 300 respectively.

[0058] The control unit 400 can adjust the slew rate of the data signal according to the position of the scan line S to which the scan signal is supplied. That is, when the scan signal is supplied to the scan line S in sequence, the control unit 400 can determine the position of the scan line S to which the scan signal is supplied and control the data drive unit 300 to output a synchronized data signal with a slew rate that applies a preset weighting value (or compensation value) at the timing of the supply of the corresponding scan signal.

[0059] For example, in order to control the slew rate of the data signal, the control unit 400 can adjust the over-driving pulse applied to the data signal. Additionally, in order to control the slew rate of the data signal, the control unit 400 can adjust the magnitude of the bias current (or bias voltage) that controls the drive of the output buffer of the data drive unit 300.

[0060] In one embodiment, the control unit 400 can control the data driving unit 300 according to the position of the scan line S to which the scan signal is supplied and the position of the pixel PX connected to the scan line S, so as to supply data signals to a predetermined data line D at different output timings.

[0061] The data voltage corresponding to the charging and data signal of each pixel PX. Here, the data voltage needs to be charged to a specific voltage level for a predetermined time, and the charging data voltage is required to be completed within 1 level time (1H time) when the scan signal is applied.

[0062] However, if the timing of the supply of the scan signal to each pixel PX in a pixel row and the timing of the supply of the data signal to the corresponding multiple pixel columns are different from each other, a data charging rate deviation will occur.

[0063] In such Figure 1 In the wiring structure of the pixel section 100 shown, for a pixel row, the time for the scan signal to be transmitted to the pixel PX of the pixel row due to the RC load may vary depending on the distance from the first contact CP1 and the second contact CP2.

[0064] As a result, uneven data charging rates between pixels may lead to a decrease in display quality.

[0065] That is, in the main scan line SM of a scan line S, the RC load (or equivalent impedance) at each position is different, so the control unit 400 can adaptively control the output timing of the data signal in response to such deviations in the RC load. At the same time, the slew rate (overdrive pulse, etc.) of the data signal can be adaptively controlled by taking into account the deviations in the RC load of the data line D on the second direction DR2.

[0066] exist Figure 1 The diagram shows different structures for the scan driver unit 200, data driver unit 300, and control unit 400. However, at least a portion of the scan driver unit 200, data driver unit 300, and control unit 400 can be integrated into a single module or integrated circuit chip. In one embodiment, at least a portion of the structure and / or function of the control unit 400 may be included in the data driver unit 300. For example, the data driver unit 300 and the control unit 400 may be included in a single source IC.

[0067] Furthermore, the scan drive unit 200 may be composed of multiple scan drive units, each responsible for driving a portion of the pixel unit 100. Similarly, the data drive unit 300 may be composed of multiple data drive units, each responsible for driving a portion of the pixel unit 100.

[0068] Figure 2 It indicates that the connection is included in Figure 1 A diagram illustrating an example of the scan lines of pixel rows and data lines in a display device.

[0069] Reference Figure 2 The i-th pixel row PXRi (where i is a natural number) can be connected to the i-th scan line Si.

[0070] In one embodiment, the i-th scan line Si may include a main scan line SM_i, a first sub-scan line SS1_i, and a second sub-scan line SS2_i. The scan signal supplied to the first sub-scan line SS1_i and the second sub-scan line SS2_i can be supplied to the first to sixth pixels PX1 to PX6 of the i-th pixel row PXRi through the main scan line SM_i.

[0071] The first to sixth pixels PX1 to PX6 can each be connected to the first to sixth data lines D1 to D6. If a scan signal is supplied to the i-th scan line Si, the data signal can be written to the first to sixth pixels PX1 to PX6 respectively through the first to sixth data lines D1 to D6.

[0072] The scan signal can be transmitted to the main scan line SM_i through the first sub-scan line SS1_i, and supplied to the main scan line SM_i in both directions from the first contact CP1. Similarly, the scan signal transmitted through the second sub-scan line SS2_i can be supplied to the main scan line SM_i in both directions from the second contact CP2.

[0073] At this time, as the distance from the first contact point CP1 moves away, the RC load (hereinafter referred to as load) seen from the main scan line SM_i and the pixels PX1 to PX6 connected to it can increase. Furthermore, the load can increase as the distance from the second contact point CP2 moves away. For example, in the region between the first contact point CP1 and the second contact point CP2, the load at the first position P1, corresponding to the midpoint between the first contact point CP1 and the second contact point CP2, can be the largest.

[0074] In other words, the waveform of the scan signal supplied to the fourth pixel PX4 corresponding to the first position P1 is less affected by the load compared to the waveforms of the scan signals supplied to the second pixel PX2 near the first contact CP1 and the sixth pixel PX6 near the second contact CP2. For example, the slew rate of the scan signal supplied to the fourth pixel PX4 can be lower than the slew rate of the scan signals supplied to the second pixel PX2 and the sixth pixel PX6.

[0075] Similarly, the load of scan line Si at the second position P2 (third pixel PX3) and the third position P3 (fifth pixel PX5) can be smaller than the load of scan line Si at the first position P1.

[0076] As the scan line Si moves to the left from the first contact CP1 (i.e., the opposite direction of the first direction DR1), the load on the scan line Si can increase. As the scan line Si moves to the right from the second contact CP2 (i.e., the first direction DR1), the load on the scan line Si can also increase.

[0077] Figure 3a It shows the direction Figure 2 A timing diagram illustrating the delay time of the data signal supplied to the pixels in a pixel row.

[0078] Reference Figure 1 , Figure 2 as well as Figure 3a The control unit 400 can adjust the output timing of the data signal according to the position of the object pixel connected to the main scan line SM_i on the first direction DR1.

[0079] Figure 3a The graph shows the curve for Figure 2 The delay time DT of the data signal supplied to each pixel in the i-th pixel row PXRi according to the pixel position in the first direction DR1.

[0080] In one embodiment, the control unit 400 can adjust the output timing of the data signal based on the distance between the object pixel and the first contact CP1 and the distance between the object pixel and the second contact CP2. In other words, the control unit 400 can delay the output timing of the data signal as the load in the main scan line SM_i increases.

[0081] like Figure 3a As shown, the load is smallest at the position corresponding to the second pixel PX2, which is closest to the first contact point CP1, and at the position corresponding to the sixth pixel PX6, which is closest to the second contact point CP2, while the load is largest at the position corresponding to the fourth pixel PX4.

[0082] When a scan signal is supplied to the main scan line SM_i, the output timing of data signals for the same color level can be faster as data lines D1 to D6 move closer to the first contact CP1 or the second contact CP2 from the fourth pixel PX4. For example, the output timing of the data signal supplied to the second pixel PX2 can be faster than the output timing of the data signal supplied to the third pixel PX3. Furthermore, the output timing of the data signal supplied to the third pixel PX3 can be faster than the output timing of the data signal supplied to the fourth pixel PX4.

[0083] In one embodiment, when a scan signal is supplied to the main scan line SM_i, the output timing of the data signal for the same color level output to the data line (e.g., D1) connected to the pixel to the left of the first contact CP1 (e.g., the first pixel PX1) can be further delayed as it moves away from the first contact CP1. For example, the output timing of the data signal supplied to the first pixel PX1 can be later than the output timing of the data signal supplied to the second pixel PX2.

[0084] Similarly, when a scan signal is supplied to the main scan line SM_i, the output timing of the data signal for the same color level output to the data line connected to the pixel to the right of the second contact CP2 can be further delayed as it moves away from the second contact CP2.

[0085] In other words, the control unit 400 can adjust the output delay time DT (or shift amount) of the data signal based on the change in the slew rate of the scan signal at the pixel position in the i-th pixel row PXRi. The lower the slew rate of the scan signal, the longer the data signal can be output.

[0086] This reduces the charge rate deviation of the data signal of the pixels in the i-th pixel row PXRi, thereby improving display quality.

[0087] Figure 3b It shows the direction Figure 2 Another example of a timing diagram showing the delay time of the data signal supply for the pixel row of pixels.

[0088] exist Figure 3b In China, regarding the reference Figure 3a The constituent elements described will use the same reference numerals in the accompanying drawings, and repeated descriptions of these constituent elements will be omitted.

[0089] Reference Figure 1 , Figure 2 as well as Figure 3b The delay time DT of the data signal can vary to distinguish each predetermined region.

[0090] The control unit 400 can adjust the output timing of the data signal based on the distance between the target pixel and the first contact CP1 and the distance between the target pixel and the second contact CP2. At this time, the delay time DT of the data signal can be gradually set based on the first contact CP1, the second contact CP2, and the first position P1. Therefore, with... Figure 3a In comparison, it can reduce the drive burden and power consumption of the control unit 400.

[0091] Figure 4 It is a brief illustration of what is included. Figure 1 An example of a pixel section in a display device.

[0092] Reference Figure 4 The scan lines S1 to Sn (where n is an integer greater than 1) may include the main scan lines SM_1 to SM_n, the first sub-scan lines SS1_1 to SS1_n, and the second sub-scan lines SS2_1 to SS2_n.

[0093] It is possible that the first sub-scan line SS1_i of the i-th scan line Si is connected to the main scan line SM_i of the i-th scan line Si through the first contact CP1, and the second sub-scan line SS2_i of the i-th scan line Si is connected to the main scan line SM_i of the i-th scan line Si through the second contact CP2.

[0094] In one embodiment, the first sub-scan lines SS1_1 to SS1_n and the second sub-scan lines SS2_1 to SS2_n can be configured to gradually increase in length as they move toward the first direction DR1. Figure 4The configuration trend of the first contact CPS1 connected to the first sub-scan lines SS1_1 to SS1_n and the configuration trend of the second contact CPS2 connected to the second sub-scan lines SS2_1 to SS2_n are briefly shown. For example, the first sub-scan line SS1_n of the nth scan line Sn can be configured to the right of the first sub-scan line SS1_1 of the first scan line S1, and the second sub-scan line SS2_n of the nth scan line Sn can be configured to the right of the second sub-scan line SS2_1 of the first scan line S1. Based on this configuration of the first and second contacts CPS1 and CPS2, the intermediate point MPS with the highest load on the scan line can be determined. Each intermediate point MPS can be compared with a reference... Figure 2 The first position P1 corresponds to the description.

[0095] As the scan line moves closer to the first contact CPS1 or the second contact CPS2 from each intermediate point MPS, the load on the scan line decreases, and the delay time (shift amount) of the data signal can be reduced.

[0096] In one embodiment, the scan signal and the data signal can be supplied from the lower side of the pixel portion 100 to the second direction DR2.

[0097] The j-th data line Dj (where j is a positive integer) can extend in the second direction DR2 and form the j-th pixel column. As the data driving unit ( Figure 1 As the distance from the 300 (in the image) increases, the load (RC load) of the j-th data line Dj increases. For example, the load of the j-th data line Dj when the scan signal is supplied to the eighth pixel PX8 can be greater than the load of the j-th data line Dj when the scan signal is supplied to the seventh pixel PX7. Similarly, the load of the j-th data line Dj when the scan signal is supplied to the ninth pixel PX9 can be greater than the load of the j-th data line Dj when the scan signal is supplied to the eighth pixel PX8.

[0098] Figure 5 It shows the direction Figure 4 The timing diagram shows an example of overdrive driving of the data signal supplied by the pixel column of the pixel section.

[0099] Reference Figure 1 , Figure 4 as well as Figure 5 The control unit 400 can adjust the overdrive pulse of the data signal according to the scan line of the supplied scan signal.

[0100] As the load on the j-th data line Dj increases, the control unit 400 can increase at least one of the width and height of the overdrive pulse. For example, as the main scan lines SM_1 to SM_n supplied with the scan signal move away from the data drive unit 300, at least one of the width and size of the overdrive pulse of the data signal can be increased.

[0101] In one embodiment, for the same color level, the width of the overdrive pulse of the data signal DSj_1 supplied to the first pixel row corresponding to the first scan line S1 can be greater than the width of the overdrive pulse of the data signal DSj_i supplied to the i-th pixel row corresponding to the i-th scan line (where i is an integer greater than 1 and less than n). The height of the overdrive pulse of the data signal DSj_1 supplied to the first pixel row can be greater than the height of the overdrive pulse of the data signal DSj_i supplied to the i-th pixel row.

[0102] Similarly, the width and / or height of the overdrive pulse of the data signal DSj_i supplied to the i-th pixel row can be greater than the width and / or height of the overdrive pulse of the data signal DSj_n supplied to the n-th pixel row.

[0103] Therefore, by reducing the waveform variation of the data signal due to the RC delay of the data line load, the deviation of the data charging rate for the second direction DR2 can be reduced.

[0104] Figure 6 It is shown that it includes Figure 1 A block diagram illustrating an example of a data driving unit and a control unit in a display device. Figure 7 It is used for explanation Figure 6 A diagram showing the operation of the control unit.

[0105] Reference Figure 1 , Figure 4 , Figure 6 as well as Figure 7 The control unit 400 can control the slew rate of the data signal and the output timing based on the load of the scan line and the load of the data line.

[0106] The data drive unit 300 may include a shift register 320, a latch unit 340, a digital-to-analog converter 360, and an output buffer 380.

[0107] The shift register 320 can control the timing of the sequential storage of image data DATA in the latch section 340. For example, the shift register 320 may include m shift circuits (where m is an integer greater than 1) corresponding to the number of data lines.

[0108] For ease of explanation, Figure 6 Only a portion of the structure of the data driving unit 300 and a portion of the control unit 400 used to drive the j-th data line Dj are shown in the description, which focuses on the driving of the j-th data line Dj.

[0109] The shift register 320 can receive the start signal STH and the data clock signal DCLK from the control unit 400. The shift register 320 can shift the start signal STH by synchronizing with the data clock signal DCLK, generating a shift clock signal, such as a latch clock signal. The latch clock signal CKj corresponding to the j-th data line Dj can be provided to the latch unit 340.

[0110] The latch unit 340 can latch image data DATA and output it simultaneously in horizontal line units (or pixel row units). The latch unit 340 can be composed of m latch circuits. In one embodiment, the latch unit 340 can store image data DATA corresponding to one horizontal line sequentially from one end of the latch circuit to the other based on a latch clock signal. Once the storage of image data DATA is complete, the latch unit 340 can respond to a load signal and output the latched image data in horizontal line units. The image data corresponding to one horizontal line can be N bits (e.g., N is 8).

[0111] exist Figure 6 The image data DTj latched corresponding to the j-th data line Dj is shown. For example, the latched image data DTj can be output to the digital-to-analog converter 360 in response to the j-th load signal LORDj supplied from the control unit 400. That is, the output timing of the data signal DS to the j-th data line Dj can be determined based on the output timing of the j-th load signal LORDj.

[0112] In one embodiment, the latch unit 340 may include a sampling latch and a holding latch. For example, the latch unit 340 may include m sampling latches, each for storing m digital image data DATA. Each sampling latch may have a storage capacity corresponding to the number of bits of the image data DATA, and sequentially stores the image data DATA in response to a sampling signal.

[0113] m hold latches can simultaneously receive and store input latched image data from the sampling latches, and supply the latched image data stored in the previous period to the digital-to-analog converter 360 based on the load signal. For example, the j-th hold latch can supply the latched image data DTj to the digital-to-analog converter 360 in response to the j-th load signal LORDj.

[0114] That is, depending on the load signal, the output time points of the image data corresponding to a pixel row (horizontal line) can be different from each other.

[0115] The digital-to-analog converter 360 can convert latched image data DTj into an analog output signal Yj based on gamma voltage. The output signal Yj can be supplied to the output buffer 380.

[0116] The output buffer 380 can output the output signal Yj from the digital-to-analog converter 360 to the j-th data line Dj. For example, the output buffer 380 can be driven by a predetermined bias voltage and a clock signal to output the data signal DS to the j-th data line Dj.

[0117] In one embodiment, the output buffer 380 can receive the overdrive pulse OVP generated from the control unit 400. The output buffer 380 can output the data signal DS, which combines the output signal Yj and the overdrive pulse OVP, to the j-th data line Dj.

[0118] The control unit 400 may include a memory 420, a latch control unit 440, and a slew rate control unit 460. Hereinafter, [these are related to...]. Figure 7 The structure and operation of the control unit 400 will be explained in conjunction with the following. In one embodiment, as... Figure 6 As shown, the slew rate control unit 460 can control the overdrive pulse of the data signal.

[0119] The memory 420 stores overdrive values ​​OV1 to OV4 and shift values ​​SHV1 and SHV2 corresponding to the preset positions of the pixel unit 100. For example, Figure 7 As shown, the shift values ​​of the points with the highest scan line load (hereinafter, scan load) based on the horizontal direction (e.g., A_P, C_P, F_P, H_P) and the lowest scan line load (e.g., B_P, D_P, E_P, G_P), and the points with the highest data line load (hereinafter, data load) based on the vertical direction (A_P, B_P, C_P, D_P) and the lowest data line load (E_P, F_P, G_P, H_P), can be stored in the memory 420. Furthermore, the overdrive values ​​OV1 to OV4 can correspond to each predetermined region DA1 to DA4 of the pixel unit 100.

[0120] For example, points A_P, B_P, C_P, and D_P have the highest data load, while points E_P, F_P, G_P, and H_P have the lowest data load. In other words, the point farthest from the data driver has the highest data load, and the point closest to the data driver has the lowest data load.

[0121] It's possible that the closer to the first contact point CPS1 or the second contact point CPS2, the smaller the scan load; and the closer to the middle point MPS, the larger the scan load. For example, the scan loads at points B_P, D_P, E_P, and G_P are the smallest, while the scan loads at points A_P, C_P, F_P, and H_P are the largest.

[0122] In this way, based on the scan load and data load, one of the following data can be set for the eight points A_P, B_P, C_P, D_P, E_P, F_P, G_P, and H_P: the first load HH, the second load LH, the third load HL, and the fourth load LL.

[0123] The first load HH can refer to the maximum scan load and the maximum data load, with the shift value and overdrive value set to their maximum values. Specifically, a larger shift value results in a longer output delay for the data signal, and a larger overdrive value results in a wider and / or higher overdrive pulse width and / or height for the data signal.

[0124] The second load (LH) can refer to both the minimum scan load and the maximum data load. For example, the second load (LH) could correspond to point B_P and point D_P.

[0125] The third load HL can refer to the maximum scan load and the minimum data load. For example, the third load HL can correspond to point F_P and point H_P.

[0126] The fourth load LL can refer to both the minimum scan load and the minimum data load. For example, the fourth load LL can correspond to point E_P and point G_P.

[0127] In one embodiment, the overdrive value can be set to different values ​​along the second direction DR2 depending on the data load. For example, the pixel section 100 can be divided into first to fourth regions DA1 to DA4, each corresponding to a first to a fourth overdrive value OV1 to OV4. When writing a data signal to a pixel row included in the first region DA1, the first overdrive value OV1 can be read from the memory 420. According to the embodiment, from the perspective of reducing power consumption, the overdrive pulse may not be applied to the data signal with the first overdrive value OV1.

[0128] In one embodiment, a shift value based on the scan load can be set according to the first contact CPS1, the second contact CPS2, and the intermediate point MPS. For example, the first shift value SHV1 can correspond to the first contact CPS1 and the second contact CPS2, and the second shift value SHV2 can correspond to the intermediate point MPS. The second shift value SHV2 can correspond to the point A_P and the point H_P where the scan load is the largest.

[0129] The first shift value SHV1 may correspond to the minimum delay time (or minimum shift amount) of the data signal, and the second shift value SHV2 may correspond to the maximum delay time (or maximum shift amount) of the data signal. According to an embodiment, the data signal to which the first shift value SHV1 is applied can be output to the data line without delay.

[0130] The slew rate control unit 460 can generate an overdrive pulse OVP for the data signal supplied to the target pixel based on the position of the main scan line of the connected target pixel and the overdrive values ​​OV1 to OV4.

[0131] In one embodiment, the slew rate control unit 460 can determine the position of the main scan line (i.e., the pixel row of the target pixel) based on the horizontal synchronization signal Hsync. The horizontal synchronization signal Hsync is supplied in units of pixel rows (or horizontal lines). The slew rate control unit 460 can sense the target pixel row including the target pixel by counting the input of the horizontal synchronization signal Hsync.

[0132] The slew rate control unit 460 can determine the region containing the target pixel row from the first to fourth regions DA1 to DA4, and read the overdrive value corresponding to the corresponding region from the memory 420. The slew rate control unit 460 can generate an overdrive pulse OVP using the read overdrive value.

[0133] In one embodiment, when the target pixel row is included in the first region DA1, the slew rate control unit 460 does not generate an overdrive pulse OVP.

[0134] The latch control unit 440 can control the output timing of the image data DTj of the latch unit 340 based on the position of the object pixel in the main scan line and the shift values ​​SHV1 and SHV2. In one embodiment, the latch control unit 440 can sense the object pixel row including the object pixel by counting the input of the horizontal synchronization signal Hsync. The latch control unit 440 can calculate the shift value based on the positional relationship between the first contact CP1, the second contact CP2, the intermediate point MP, and the object pixel in the object pixel row.

[0135] For example, when the object pixel is between the first contact point CP1 and the intermediate point MP, the shift value corresponding to the object pixel can be calculated by interpolating the first shift value SHV1 corresponding to the first contact point CP1 and the second shift value SHV2 corresponding to the intermediate point MP.

[0136] To reduce power consumption and computational complexity, the shift value calculated through such interpolation can be varied at predetermined intervals within the pixel rows of the object.

[0137] The latch control unit 440 can generate the j-th load signal LORDj using the calculated shift value. The j-th load signal LORDj can control the timing of the latched image data DTj supplied to the digital-to-analog converter 360. This allows adjustment of the output timing (delay time) of the data signal DS.

[0138] As described above, the display device according to an embodiment of the present invention can take into account both the scanning load and the data load in a single-sided driving mode, and control the slew rate of the data signal and / or the output timing (output delay time) of the data signal differently depending on the position of the pixel within the pixel unit 100. Therefore, the charging rate deviation of the pixel's data signal can be reduced, thereby improving the display quality.

[0139] Figures 8a to 8d It is shown Figure 6 A diagram illustrating an example of the operation of the control unit.

[0140] Reference Figures 6 to 8d It can control the slew rate of the data signal DS and the output timing according to the load corresponding to the pixel.

[0141] like Figure 8a As shown, when the scan signal SCAN is supplied to the pixel corresponding to the fourth load LL (e.g., the pixel at point E_P and / or point G_P), the load on the data signal DS and the scan signal SCAN is weak. Therefore, the output of the data signal DS is not shifted (delayed), and no overdrive pulse is applied. For example, the period between the start time of the rise of the scan signal SCAN and the end time of the fall of the scan signal SCAN can be defined as a first width W. In this case, the supply of the data signal DS can begin at a time point substantially the same as the start time of the rise of the scan signal SCAN (e.g., corresponding to the rise time of the data signal DS) and end at a time point substantially the same as the end time of the fall of the scan signal SCAN.

[0142] like Figure 8b As shown, when supplying a scan signal SCAN to the pixel corresponding to the third load HL (e.g., the pixel at point F_P and point H_P), the output time of the scan signal SCAN may be shortened due to the output delay of the large scan load. For example, the period between the start of the rise of the scan signal SCAN and the end of the fall of the scan signal SCAN may be greater than the first width W.

[0143] At this time, the output of the data signal DS can be delayed by driving the latch control unit 440 of the control unit 400. Therefore, the charging rate of the data signal DS for the pixel corresponding to the third load HL can be adequately ensured.

[0144] like Figure 8cAs shown, when the scan signal SCAN is supplied to the pixel corresponding to the second load LH (e.g., the pixel at point B_P and point D_P), the output of the data signal DS may be delayed due to the large data load. That is, the time delay before the data signal DS reaches the target level may reduce the charging rate of the data signal DS.

[0145] At this time, the slew rate of the data signal DS can be increased by driving the slew rate control unit 460 of the control unit 400. Therefore, the charging rate of the data signal DS for the pixel corresponding to the second load LH can be adequately ensured.

[0146] like Figure 8d As shown, when a scan signal SCAN is supplied to the pixel corresponding to the first load HH (e.g., the pixel at point A_P and point C_P), both the data signal DS and the scan signal SCAN may be delayed. In this case, the data signal DS can be controlled by the operation of the slew rate control unit 460 and the latch control unit 440. For example, the output can be delayed (shifted) by increasing the slew rate of the data signal DS.

[0147] Therefore, since the data signal DS can be supplied synchronously with the scan signal SCAN, the charging rate of the data signal DS for the pixel corresponding to the first load HH can be fully ensured.

[0148] Figure 9a It is used for explanation Figure 6 Another example of a block diagram of the control unit, Figure 9b It is shown that it includes Figure 9a A diagram illustrating an example of the structure of a portion of the slewing rate control section within the control unit.

[0149] exist Figure 9a In the middle, refer to Figure 6 The same or similar components described herein use the same reference numerals, and repeated descriptions are omitted. In addition, apart from the structure in which the bias voltage BV is controlled by the slew rate control unit 460A, Figure 9a The control unit 400A can have the same as Figure 6 The control unit 400 has a substantially the same or similar structure.

[0150] Reference Figure 9a The control unit 400A can control the slew rate of the data signal and the output timing based on the load of the scan line and the load of the data line.

[0151] In one embodiment, the bias value can be set in memory 420 instead of the overdrive value.

[0152] In one embodiment, the slew rate control unit 460A can adjust the bias voltage BV (or bias current) supplied to the output buffer 380. The output buffer 380 can be implemented as an operational (OP) amplifier, and the bias voltage BV can serve as a power supply for driving the operational amplifier. Regarding the characteristics of the output buffer 380 implemented as an operational amplifier, the slew rate of the data signal DS can vary depending on the bias voltage BV. For example, for the same color level, a larger bias voltage BV results in a larger slew rate for the data signal DS.

[0153] Therefore, the slew rate control unit 460A can increase the bias voltage BV as the data load increases.

[0154] The slew rate control unit 460A can adjust the bias voltage BV supplied to the output buffer corresponding to the object pixel based on the position of the main scan line of the connected object pixel and the bias value.

[0155] The slew rate control unit 460A can determine the region containing the target pixel row from the first to fourth regions DA1 to DA4, and export the bias value corresponding to the corresponding region from the memory 420. The slew rate control unit 460A can adjust the magnitude of the bias voltage BV using the exported bias value.

[0156] In one embodiment, such as Figure 9b As shown, the slew rate control unit 460A may include a bias voltage generation unit 462. The bias voltage generation unit 462 may include multiple current sources connected in parallel and a switch that controls their connection. The slew rate control unit 460A may generate a current source control signal LCTL for controlling the switch based on the bias value. The operation of the switch can be controlled by the current source control signal LCTL.

[0157] For example, the smaller the data load, the fewer switches are turned on, and the smaller the bias voltage BV becomes.

[0158] The output buffer 380 can adjust the slew rate of the output signal Yj based on the bias voltage BV.

[0159] Through the operation of such a control unit 400A, the data signal DS can be adjusted according to the pixel position, such as Figures 8a to 8d Output the waveform shown.

[0160] Figure 10 It is used to explain the basis Figure 9b The diagram shows an example of the bias voltage output of the slew rate control unit.

[0161] Reference Figure 7 , Figure 9a , Figure 9b as well as Figure 10The slew rate control unit 460A can gradually increase the magnitude of the bias voltage BV over time during a frame.

[0162] As time passes, scan signals can be sequentially supplied to the scan lines. For example, when a data signal DS is supplied to the first region DA1, the bias voltage BV can have a first voltage level V1; when a data signal DS is supplied to the second region DA2, the bias voltage BV can have a second voltage level V2. Similarly, when a data signal DS is supplied to the third region DA3, the bias voltage BV can have a third voltage level V3; and when a data signal DS is supplied to the fourth region DA4, the bias voltage BV can have a fourth voltage level V4.

[0163] Therefore, as the data load increases, the slew rate of the data signal DS can be increased.

[0164] As described above, the display device according to an embodiment of the present invention can take into account both the scanning load and the data load in a single-sided driving mode, and control the slew rate of the data signal and / or the output timing (output delay time) of the data signal differently depending on the position of the pixel within the pixel unit 100. Therefore, the charging rate deviation of the pixel's data signal can be reduced, thereby improving the display quality.

[0165] The invention has been described above with reference to embodiments thereof. However, those skilled in the art will understand that various modifications and alterations can be made to the invention without departing from the concept and scope of the invention as set forth in the claims.

Claims

1. A display device, wherein, include: The pixel section includes pixels connected to the data line and the scan line; A data driving unit is disposed on one side of the pixel unit and drives the data line; A scan driving unit, disposed together with the data driving unit on one side of the pixel portion, drives the scan line; and The control unit, based on the load of the scan line and the load of the data line, controls the slew rate and output timing of the data signal output to the data line. Each of the scan lines includes: The main scan line extends in the first direction and connects with the pixels of the corresponding pixel row; A first sub-scan line extends in a second direction different from the first direction and connects with the main scan line at a first junction; and The second sub-scan line extends in the second direction and connects with the main scan line at the second junction. The control unit adjusts the output timing of the data signal for each scan line based on the distance between the object pixel connected to the main scan line and the first contact point, and the distance between the object pixel and the second contact point.

2. The display device according to claim 1, wherein, The control unit adjusts the overdrive pulse of the data signal according to the scan line in the scan line to which the scan signal is supplied.

3. The display device according to claim 2, wherein, For the same color level, the width of the overdrive pulse of the data signal supplied to the first pixel row corresponding to the first scan line is smaller than the width of the overdrive pulse of the data signal supplied to the second pixel row corresponding to the second scan line. The main scan line and the first pixel row of the first scan line are closer to the data driving unit than the main scan line and the second pixel row of the second scan line.

4. The display device according to claim 2, wherein, For the same color level, the height of the overdrive pulse of the data signal supplied to the first pixel row corresponding to the first scan line is less than the height of the overdrive pulse of the data signal supplied to the second pixel row corresponding to the second scan line. The main scan line and the first pixel row of the first scan line are closer to the data driving unit than the main scan line and the second pixel row of the second scan line.

5. The display device according to claim 2, wherein, As the load on the data line increases, the control unit increases at least one of the width and height of the overdrive pulse.

6. The display device according to claim 5, wherein, As the main scan line supplied with the scan signal moves away from the data drive unit, at least one of the width of the overdrive pulse and the size of the overdrive pulse increases.

7. The display device according to claim 1, wherein, As the first sub-scan line and the second sub-scan line move in the first direction, the length of the first sub-scan line and the second sub-scan line gradually increases.

8. The display device according to claim 2, wherein, For the same color level, the data signal supplied to the first pixel connected to the first position of the main scan line is output later than the data signal supplied to the second pixel connected to the second position of the main scan line and the data signal supplied to the third pixel connected to the third position of the main scan line. The first position of the main scan line corresponds to the midpoint between the first contact and the second contact. The second position of the main scan line is closer to the first contact point than the first position. The third position of the main scan line is closer to the second contact point than the first position.

9. The display device according to claim 8, wherein, When the scan signal is supplied to the main scan line, the timing of the output of the data signal for the same color level increases as the data line moves from the first pixel toward the first contact or the second contact.

10. The display device according to claim 8, wherein, When the scan signal is supplied to the main scan line, the timing of the output of the data signal for the same color level to the data line connected to the pixel on the left side of the first contact, which is opposite to the first position, is further delayed as it moves away from the first contact.

11. The display device according to claim 8, wherein, When the scan signal is supplied to the main scan line, the timing of the output of the data signal for the same color level to the data line connected to the pixel on the right side of the second contact, which is opposite to the first position, is further delayed as it moves away from the second contact.

12. The display device according to claim 1, wherein, As the load on the main scan line increases, the control unit causes the output timing of the data signal to be further delayed.

13. The display device according to claim 1, wherein, The data driving unit includes: The latch section latches image data and outputs it in pixel rows. A digital-to-analog converter transforms the latched image data into the data signal; and The output buffer outputs the data signal to the data line.

14. The display device according to claim 13, wherein, The control unit includes: The memory stores the overdrive value and shift value corresponding to the set point of the pixel; The slew rate control unit generates an overdrive pulse for the data signal supplied to the object pixel based on the position of the main scan line and the overdrive value; and The latch control unit controls the output timing of the image data of the latch unit based on the position of the object pixel in the main scan line and the shift value.

15. The display device according to claim 13, wherein, The control unit adjusts the bias voltage supplied to the output buffer according to the scan line of the scan line to which the scan signal is supplied.

16. The display device according to claim 15, wherein, The control unit includes: The memory stores the offset value and shift value corresponding to the set point of the pixel; The slew rate control unit adjusts the bias voltage supplied to the output buffer corresponding to the object pixel based on the position of the main scan line of the connected object pixel and the bias value; and The latch control unit controls the output timing of the image data of the latch unit based on the position of the object pixel in the main scan line and the shift value.

17. The display device according to claim 15, wherein, The control unit increases the bias voltage as the load on the data line increases.

Images