Display driving device and display device including the same

Abstract

The present disclosure discloses a display driving device capable of reducing chip area and data transmission time, and a display device including the display driving device. The display driving device includes a first source driver and a second source driver. Each of the first source driver and the second source driver may include: a sensing circuit configured to sample and hold a multi-channel input signal; a multiplexer configured to transmit the input signal held by the sensing circuit; an analog-to-digital converter configured to convert the input signal received from the multiplexer into digital data; and a transmission circuit configured to transmit the digital data to a timing controller through a bus channel. While the first source driver transmits the digital data, the sensing circuit of the second source driver may hold the input signal.

Description

Technical Field

[0001] The present disclosure relates to a display device, and more particularly, to a display driving device capable of reducing an area and data transmission time, and a display device including the display driving device. Background Art

[0002] Typically, a display device includes a display panel, a display driving device, a timing controller, and the like.

[0003] The display driving device converts digital video data provided by the timing controller into source signals and provides the source signals to the display panel. The display driving device may include a source driver integrated in a chip form, and may include a plurality of source drivers by considering the size and resolution of the display panel.

[0004] In addition, the source driver of the display driving device senses pixel signals of multiple channels respectively, converts the pixel signals into digital data, and transmits the digital data through the bus channel.

[0005] A display driving apparatus according to the conventional art operates with a conversion time and a transmission time separated.

[0006] First, in conventional technology, the pixel signal is converted into digital data. The digital data is stored in a memory circuit. The digital data stored in the memory circuit is transmitted to the timing controller through a bus channel. In this case, the source driver transmits the digital data to the timing controller in a time-division manner.

[0007] The problem with the conventional technology is that since a memory circuit corresponding to "the number of channels × the number of bits" for storing digital data of multiple channels is required, the area is increased. In addition, since the conventional technology operates with the conversion time and the transmission time separated, the total transmission time increases as much as "conversion time + the number of channels × the transmission time". Summary of the invention

[0008] Various embodiments are directed to providing a display driving device capable of reducing an area and a data transmission time, and a display device including the display driving device.

[0009] In an embodiment, the display driving device may include a first source driver and a second source driver. Each of the first source driver and the second source driver may include: a sensing circuit configured to sample and hold a multi-channel input signal; a multiplexer configured to transmit the input signal held by the sensing circuit; an analog-to-digital converter configured to convert the input signal received from the multiplexer into digital data; and a transmission circuit configured to transmit the digital data to the timing controller through a bus channel. While the first source driver transmits the digital data, the sensing circuit of the second source driver may hold the input signal.

[0010] In an embodiment, a display device may include: a display panel; and a first source driver, a second source driver, and a third source driver, each configured to provide a source signal to the display panel and sense characteristics of the display panel. Each of the first source driver, the second source driver, and the third source driver may include: a sensing circuit configured to sample and hold a multi-channel input signal connected to the display panel; a multiplexer configured to transmit the input signal held by the sensing circuit; an analog-to-digital converter configured to convert the input signal received from the multiplexer into digital data; and a transmission circuit configured to transmit the digital data to a timing controller through a bus channel. While the first source driver transmits the digital data, the sensing circuit of each of the second source driver and the third source driver may hold the input signal.

[0011] In an embodiment, a display driving device may include a first source driver, the first source driver including: a sensing circuit configured to sample and hold input signals of multiple channels; a multiplexer configured to transmit the input signal held by the sensing circuit in response to a carry signal for multiple channels; an analog-to-digital converter configured to convert the input signal received from the multiplexer into digital data; a transmission circuit configured to transmit the digital data to a timing controller through a bus channel; and a control circuit configured to generate a carry signal in response to a sampling signal provided by the timing controller and provide the carry signal to the multiplexer. While the second source driver transmits the digital data, the sensing circuit of the first source driver may hold the input signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a block diagram of a display device according to an embodiment.

[0013] Figure 2 is a block diagram of a first source driver of a display driving device according to an embodiment.

[0014] Figure 3 Is used to describe Figure 2 FIG. 1 is a timing diagram of the operation of the first source driver. DETAILED DESCRIPTION

[0015] Exemplary embodiments will be described in more detail below with reference to the accompanying drawings. However, the present disclosure can be implemented in different forms and should not be constructed to be limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure will be thorough and complete, and the scope of the present disclosure will be fully conveyed to those skilled in the art. Throughout the disclosure, in each of the drawings and embodiments of the present disclosure, the same reference numerals represent the same parts.

[0016] Embodiments provide a display driving device capable of reducing a chip area and data transmission time, and a display device including the display driving device.

[0017] In an implementation, the multiple channels CH1 to CHm may be defined as signal lines coupled to data lines or sensing lines of the display panel 100 in order to detect pixel signals of the display panel 100. In this case, m is a natural number of 2 or more.

[0018] In an embodiment, the sampling period may be defined as a period in which the first to nth source drivers SD1 to SDn sample and hold pixel signals of the display panel 100 through the multiple channels CH1 to CHm. In this case, n is a natural number of 2 or more.

[0019] In an embodiment, the conversion and transmission period may be defined as a period in which the first to nth source drivers SD1 to SDn convert pixel signals stored therein into digital data and transmit the digital data to the timing controller T-CON.

[0020] Figure 1 is a block diagram of a display device according to an embodiment.

[0021] Reference Figure 1 The display device includes a timing controller T-CON, a display driving device and a display panel 100, wherein the display driving device includes a first source driver SD1 to an nth source driver SDn.

[0022] The timing controller T-CON provides digital video data to the first to n-th source drivers SD1 to SDn, and receives digital data indicating characteristics of the display panel 100 from the first to n-th source drivers SD1 to SDn.

[0023] The timing controller T-CON may generate compensation data for compensating for characteristic deviations between pixels of the display panel 100 using the digital data received from the first to nth source drivers SD1 to SDn, and may compensate the digital video data using the compensation data.

[0024] The display panel 100 includes data lines (not shown) and gate lines (not shown), and has pixels formed at intersections of the data lines and the gate lines. For example, the display panel 100 may be an organic light emitting diode (OLED) panel.

[0025] Each of the pixels of the OLED panel may include an OLED and a driving transistor. The driving transistor and OLED of the pixel may differ in characteristics such as threshold voltage and mobility. If the driving transistor of the pixel has different characteristics, the current provided to its OLED by the driving transistor of the pixel may be different even though the same source signal is applied to the pixel. In addition, in the OLED panel, the OLED and driving transistor of each pixel may degrade as the driving time passes. Therefore, characteristic deviations may occur between pixels.

[0026] The first to nth source drivers SD1 to SDn receive digital video data from the timing controller T-CON, convert the digital video data into source signals, and provide the source signals to the display panel 100 .

[0027] In addition, the first to nth source drivers SD1 to SDn sense pixel signals from the display panel 100, convert the pixel signals into digital data, and provide the digital data to the timing controller T-CON through the bus channel BL. Such digital data can be used to compensate for characteristic deviations between pixels.

[0028] The first to nth source drivers SD1 to SDn may be coupled to the timing controller T-CON through the bus channels BL. In addition, the first to nth source drivers SD1 to SDn may be coupled to data lines or sensing lines of the display panel 100 through the multi-channels CH1 to CHm.

[0029] This embodiment provides a display driving device, including a first source driver SD1 to an nth source driver SDn, for detecting input signals of multiple channels CH1 to CHm of a display panel 100, converting the input signals into digital data, and providing the digital data to a timing controller T-CON, thereby compensating for characteristics of the display panel 100.

[0030] In addition, the present embodiment provides a display device capable of reducing the area and data transmission time of the first to nth source drivers SD1 to SDn.

[0031] Figure 2 is a block diagram of a first source driver SD1 of a display driving device according to an embodiment. In this document, for convenience of description, a configuration of one first source driver SD1 is described. The first to nth source drivers SD1 to SDn may have the same configuration.

[0032] Reference Figure 1 and Figure 2 The display driving device includes first to n-th source drivers SD1 to SDn. Each of the first to n-th source drivers SD1 to SDn may include a sensing circuit 10, a multiplexer MUX, an analog-to-digital converter (ADC), and a transmission circuit 20.

[0033] The sensing circuit 10 may sample and hold the input signals of the multi-channels CH1 to CHm in response to the sampling signal SAM. For example, the sensing circuit 10 may include a sampling circuit (not shown) for sampling the input signal and a holding circuit for holding the input signal sampled by the sampling circuit. In this case, the sampling signal SAM may be provided by the timing controller T-CON. In this case, the multi-channels CH1 to CHm may be connected to the data line or the sensing line of the display panel 100 according to the type of the pixel.

[0034] The types of pixels may include a type in which a pixel signal is sensed through a data line to which an active signal is applied and a type in which a pixel signal is sensed through a separate sensing line.

[0035] In response to the sampling signal SAM, the sensing circuit 10 may sense the pixel signal as an input signal through the multiple channels CH1 to CHm connected to the data line or the sensing line of the display panel 100. In addition, the sensing circuit 10 may hold the input signal while another source driver transmits digital data. For example, the sensing circuit 10 may hold the input signal until a carry signal CA of a multiplexer MUX, which will be described later, is enabled.

[0036] The multiplexer MUX may transmit the input signal held by the sensing circuit 10 to the ADC in response to the carry signal CA. In this case, the carry signal CA may be enabled so as to sequentially transmit the input signals of the multiple channels CH1 to CHm. In this case, the carry signal CA may be disabled while another source driver transmits digital data to the timing controller T-CON.

[0037] The ADC may convert an input signal received from the multiplexer MUX into digital data.

[0038] The transmission circuit 20 may transmit the digital data received from the ADC to the timing controller T-CON through the bus channel BL. In this case, while the ADC converts the input signal into digital data, the transmission circuit 20 may transmit the digital data to the timing controller T-CON.

[0039] More specifically, while the (n-1)th source driver SDn-1 transmits digital data, the sensing circuit 10 of the nth source driver SDn may maintain an input signal.

[0040] For example, while the first source driver SD1 transmits digital data, the sensing circuits of the second to nth source drivers SD2 to SDn may hold input signals. In addition, while the second source driver SD2 transmits digital data, the sensing circuits of the third to nth source drivers SD3 to SDn may hold input signals.

[0041] In addition, when the (n-1)th source driver SDn-1 completes the transmission of digital data, the multiplexer MUX of the nth source driver SDn may transmit input signals of the multi-channels CH1 to CHm to the ADC.

[0042] For example, when the first source driver SD1 completes the transmission of digital data, the multiplexer MUX of the second source driver SD2 can transmit the input signals of the multiple channels CH1 to CHm to the ADC. The ADC of the second source driver SD2 can convert the input signals into digital data. While the ADC of the second source driver SD2 converts the input signals into digital data, the transmission circuit 20 of the second source driver SD2 can transmit the digital data to the timing controller T-CON.

[0043] As described above, while the first source driver SD1 transmits digital data, the sensing circuit 10 of each of the second source driver SD2 to the nth source driver SDn may maintain the input signal. When the first source driver SD1 completes the transmission of digital data, the multiplexer MUX of the second source driver SD2 may transmit the input signal to the ADC. While the ADC of the second source driver SD2 converts the input signal into digital data, the transmission circuit 20 of the second source driver SD2 may transmit the digital data to the timing controller T-CON. In this case, while the second source driver SD2 transmits digital data, the sensing circuit 10 of each of the third source driver SD3 to the nth source driver SDn may maintain the input signal.

[0044] Likewise, while another source driver transmits digital data, each of the first to n-th source drivers SD1 to SDn may hold an input signal using a hold function of its sensing circuit 10. While converting the input signal into digital data, each of the first to n-th source drivers SD1 to SDn may transmit the digital data to the timing controller T-CON through the bus channel BL.

[0045] Each of the first to nth source drivers SD1 to SDn may further include a control circuit (not shown) for generating a carry signal CA for the multi-channels CH1 to CHm using a sampling signal SAM provided by the timing controller T-CON.

[0046] The sensing circuit 10 of each of the first to nth source drivers SD1 to SDn may sample and hold input signals of the multi-channels CH1 to CHm in response to a sampling signal SAM.

[0047] Furthermore, the multiplexer MUX of each of the first to nth source drivers SD1 to SDn may transmit an input signal to the ADC thereof in response to the carry signal CA for the multi-channels CH1 to CHm.

[0048] For example, while the first source driver SD1 transmits digital data, the control circuit of the second source driver SD2 may disable carry signals for the multiple channels CH1 to CHm of the second source driver SD2 .

[0049] In addition, when the first source driver SD1 completes the transmission of the digital data, the control circuit of the second source driver SD2 may enable the carry signals for the multiple channels CH1 to CHm of the second source driver SD2 in a preset order. In this case, the control circuit of the second source driver SD2 may sequentially enable the carry signals for the multiple channels CH1 to CHm.

[0050] Figure 3 Is used to describe Figure 2 2 is a timing diagram of the operation of the first source driver SD1.

[0051] Reference Figure 3 In the sampling period, each of the first to nth source drivers SD1 to SDn samples and holds input signals of the multiple channels CH1 to CHm.

[0052] Then, in the conversion and transmission period, the first source driver SD1 converts the input signals of the multi-channels CH1 to CHm into digital data and transmits the digital data to the timing controller T-CON. At this time, the second to nth source drivers SD2 to SDn maintain the input signals.

[0053] Then, in the conversion and transmission period, when the first source driver SD1 completes the transmission of digital data, the second source driver SD2 converts the input signals of the multi-channels CH1 to CHm into digital data and transmits the digital data to the timing controller T-CON. At this time, the third source driver SD3 to the nth source driver SDn maintain the input signal.

[0054] Then, in the conversion and transmission period, when the (n-1)th source driver SDn-1 completes the transmission of digital data, the nth source driver SDn converts input signals of the multi-channels CH1 to CHm into digital data and transmits the digital data to the timing controller T-CON.

[0055] Likewise, in the sampling period, each of the first to n-th source drivers SD1 detects and holds the input signal of the multi-channels CH1 to CHm. In the conversion and transmission period, each of the first to n-th source drivers SD1 to SDn holds the input signal of the multi-channels CH1 to CHm using the holding function of its sensing circuit 10 while another source driver transmits digital data. In addition, while converting the input signal into digital data, each of the first to n-th source drivers SD1 to SDn transmits the digital data to the timing controller T-CON.

[0056] As described above, embodiments can reduce chip area by eliminating a memory circuit using the holding function of the sensing circuit 10 .

[0057] Furthermore, embodiments may reduce the total transmission time by transmitting digital data to the timing controller T-CON while converting input signals of the multi-channels CH1 to CHm into digital data.

[0058] As described above, embodiments may reduce chip area by eliminating a memory circuit using a holding function of a sensing circuit.

[0059] Furthermore, embodiments may reduce the total transmission time by transmitting digital data to the timing controller while converting input signals of multiple channels into digital data.

[0060] Although various embodiments have been described above, those skilled in the art will appreciate that the described embodiments are only exemplary. Therefore, the disclosure described herein should not be limited based on the described embodiments.

Claims

1. A display driving device, comprising: a first source driver and a second source driver, Wherein, each of the first source driver and the second source driver comprises: A sensing circuit configured to sample and hold input signals of multiple channels; a control circuit configured to generate a carry signal for the plurality of channels; a multiplexer configured to transmit the input signal held by the sensing circuit in response to the carry signal for the plurality of channels; an analog-to-digital converter configured to convert the input signal received from the multiplexer into digital data; and a transmission circuit configured to transmit the digital data to the timing controller through a bus channel, Wherein, while the first source driver transmits the digital data, the sensing circuit of the second source driver maintains the input signal, Wherein, while the first source driver transmits the digital data, the control circuit of the second source driver disables the carry signal.

2. The display driving device according to claim 1, wherein: When the first source driver completes the transmission of the digital data, the multiplexer of the second source driver transmits the input signals of the multiple channels to the analog-to-digital converter.

3. The display driving device according to claim 2, wherein: While the analog-to-digital converter converts the input signal into the digital data, the transmission circuit transmits the digital data to the timing controller.

4. The display driving device according to claim 1, wherein: The control circuit is configured to generate the carry signal for the multiple channels in response to a sampling signal provided by the timing controller.

5. The display driving device according to claim 4, wherein: The sensing circuit of each of the first source driver and the second source driver adopts and holds the input signals of the multiple channels in response to the sampling signal.

6. The display driving device according to claim 4, wherein: The multiplexer of each of the first source driver and the second source driver transmits the input signal to the analog-to-digital converter in response to the carry signal for the multiple channels.

7. The display driving device according to claim 1, wherein: When the first source driver completes the transmission of the digital data, the control circuit of the second source driver enables the carry signal for the multiple channels.

8. A display device, comprising: Display panel; as well as The first source driver, the second source driver and the third source driver are each configured to provide a source signal to the display panel and sense a characteristic of the display panel, Wherein, each of the first source driver, the second source driver and the third source driver comprises: A sensing circuit configured to sample and hold input signals of multiple channels connected to the display panel; a control circuit configured to generate a carry signal for the plurality of channels; a multiplexer configured to transmit the input signal held by the sensing circuit in response to the carry signal for the plurality of channels; an analog-to-digital converter configured to convert the input signal received from the multiplexer into digital data; and a transmission circuit configured to transmit the digital data to the timing controller through a bus channel, wherein the sensing circuit of each of the second source driver and the third source driver maintains the input signal while the first source driver transmits the digital data, Wherein, while the first source driver transmits the digital data, the control circuit of the second source driver disables the carry signal.

9. The display device according to claim 8, wherein: When the first source driver completes the transmission of the digital data, the multiplexer of the second source driver transmits the input signal to the analog-to-digital converter, and the sensing circuit of the third source driver maintains the input signal.

10. The display device according to claim 9, wherein: While the analog-to-digital converter converts the input signal into the digital data, the transmission circuit transmits the digital data to the timing controller.

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