Abstract: An integrated circuit test apparatus includes: a first test unit configured to output a current for a built-in self test (BIST) progress state for each internal circuit of an integrated circuit in a BIST test mode and to determine whether each internal circuit operates normally in a wake-up mode of the integrated circuit; and a first determination module configured to determine whether each internal circuit is in a stuck state based on a change detected by the first test unit.

Abstract: Provided is an operating method of a monitoring device configured to monitor a microcontroller unit including a plurality of cores. The operating method includes: transmitting a question message to a first core among the plurality of cores; receiving an answer message from a second core among the plurality of cores; determining whether an operation of the microcontroller unit is abnormal, by using the answer message; receiving answer messages from cores, except for the second core, among the plurality of cores when the operation of the microcontroller unit is abnormal; and detecting an error of each of the plurality of cores by using the received answer messages.

Abstract: An integrated circuit test apparatus includes: a first test unit configured to output a current for a built-in self test (BIST) progress state for each internal circuit of an integrated circuit in a BIST test mode and to determine whether each internal circuit operates normally in a wake-up mode of the integrated circuit; and a first determination module configured to determine whether each internal circuit is in a stuck state based on a change detected by the first test unit.

Abstract: Methods of operating a display driver integrated circuit (IC) are provided. A method of operating a display driver IC may include generating a first clock signal, and calculating a frequency of the first clock signal using a second clock signal. Moreover, the method may include generating an adjustment signal using the frequency of the first clock signal and a target frequency, and adjusting the frequency of the first clock signal using the adjustment signal. Related display driver ICs and portable electronic devices are also provided.

Abstract: Provided is an operating method of a monitoring device configured to monitor a microcontroller unit including a plurality of cores. The operating method includes: transmitting a question message to a first core among the plurality of cores; receiving an answer message from a second core among the plurality of cores; determining whether an operation of the microcontroller unit is abnormal, by using the answer message; receiving answer messages from cores, except for the second core, among the plurality of cores when the operation of the microcontroller unit is abnormal; and detecting an error of each of the plurality of cores by using the received answer messages.

Abstract: A display driver integrated circuit (IC) (DDI) includes a graphic memory that receives and stores line data including a plurality of pixel data blocks, an indicator generating circuit that compares the pixel data blocks of the line data received by the graphic memory with each other and generates an indicator signal corresponding to results of the comparison, and a read controller that performs a read operation with respect to the whole or a part of the line data from the graphic memory, based on a read command for the line data and the indicator signal.

Abstract: An image driving device includes a determining unit, and image processing unit, and a memory. The determining unit determines whether an input image is a moving image or a still image, and may be synchronized with an internal clock different from an external clock. The image processing unit may image-process at least one frame but less than all frames of the input image when the input image is determined to be a still image. The image processing unit may output the at least one image-processed frame as first image data, and the memory may store the first image data.

Abstract: A method of operating a display driver IC (DDI) includes comparing previous line data with current line data and the R, G, and B components of a color data signals, and controlling whether to activate part of an intermediate processing circuit to process the current line data or more than a single component of the color data signal according to a comparison result.

Abstract: A display driving device includes a first source amplifier that receives first display data and supplies a first pixel voltage to a first pixel based on the received first display data, and a second source amplifier that receives second display data and first control data and supplies a second pixel voltage to a second pixel based on the received second display data and first control data. The second source amplifier has a first stage in which a first process is performed on an input signal based on the second display data, and a second stage in which a second process is performed on the first processed input signal to output the second pixel voltage. The first source amplifier may be configured to conditionally supply the first pixel voltage to the second pixel.

Abstract: Provided are an output buffer circuit having an amplifier offset compensation function and a source driving circuit including the output buffer circuit. The output buffer circuit may include a plurality of channel amplifiers, each of which is configured to adjust an amount of current flowing through transistors connected to at least one of a non-inverted input terminal and an inverted input terminal of a differential input unit to compensate an amplifier offset, and adjust buffer input voltage signals to generate output voltage signals.

Abstract: A display driving circuit includes first through (2*n)-th buffers, a buffer controller, first through n-th image processing units, and a source driver. The buffer controller circularly selects one of the first through (2*n)-th buffers in an order from the first buffer to the (2*n)-th buffer at each of a plurality of first time intervals, and stores pixel data received during the first time interval in the selected buffer. Each of the first through n-th image processing units is coupled to two corresponding buffers among the first through (2*n)-th buffers, and processes the pixel data, which are stored in at least one of their corresponding buffers, during n of the first time intervals to generate processed data when the pixel data are stored in the corresponding buffer during the first time interval. The source driver generates analog signals based on the processed data.

Abstract: Methods of operating a display driver integrated circuit (IC) are provided. A method of operating a display driver IC may include generating a first clock signal, and calculating a frequency of the first clock signal using a second clock signal. Moreover, the method may include generating an adjustment signal using the frequency of the first clock signal and a target frequency, and adjusting the frequency of the first clock signal using the adjustment signal. Related display driver ICs and portable electronic devices are also provided.

Abstract: A gradation voltage generator for applying a gradation voltage according to gamma characteristics of a display panel includes a reference gamma selector that receives a maximum reference voltage, a minimum reference voltage, and a first reference voltage, and selects and outputs a maximum gamma voltage and a minimum gamma voltage from among voltages between the maximum reference voltage and the minimum reference voltage, wherein when the maximum reference voltage changes, the minimum gamma voltage is compensated by a difference the changed maximum reference voltage and the first reference voltage and a gamma curve controller that receives the maximum gamma voltage and the minimum gamma voltage, and generates and outputs a plurality of gradation voltages.

Abstract: Methods of operating a display driver integrated circuit (IC) are provided. A method of operating a display driver IC may include generating a first clock signal, and calculating a frequency of the first clock signal using a second clock signal. Moreover, the method may include generating an adjustment signal using the frequency of the first clock signal and a target frequency, and adjusting the frequency of the first clock signal using the adjustment signal. Related display driver ICs and portable electronic devices are also provided.

Abstract: A gradation voltage generator for applying a gradation voltage according to gamma characteristics of a display panel includes a reference gamma selector that receives a maximum reference voltage, a minimum reference voltage, and a first reference voltage, and selects and outputs a maximum gamma voltage and a minimum gamma voltage from among voltages between the maximum reference voltage and the minimum reference voltage, wherein when the maximum reference voltage changes, the minimum gamma voltage is compensated by a difference the changed maximum reference voltage and the first reference voltage and a gamma curve controller that receives the maximum gamma voltage and the minimum gamma voltage, and generates and outputs a plurality of gradation voltages.

Abstract: A display driving circuit includes first through (2*n)-th buffers, a buffer controller, first through n-th image processing units, and a source driver. The buffer controller circularly selects one of the first through (2*n)-th buffers in an order from the first buffer to the (2*n)-th buffer at each of a plurality of first time intervals, and stores pixel data received during the first time interval in the selected buffer. Each of the first through n-th image processing units is coupled to two corresponding buffers among the first through (2*n)-th buffers, and processes the pixel data, which are stored in at least one of their corresponding buffers, during n of the first time intervals to generate processed data when the pixel data are stored in the corresponding buffer during the first time interval. The source driver generates analog signals based on the processed data.

Abstract: A gradation voltage generator for applying a gradation voltage according to gamma characteristics of a display panel includes a reference gamma selector that receives a maximum reference voltage, a minimum reference voltage, and a first reference voltage, and selects and outputs a maximum gamma voltage and a minimum gamma voltage from among voltages between the maximum reference voltage and the minimum reference voltage, wherein when the maximum reference voltage changes, the minimum gamma voltage is compensated by a difference the changed maximum reference voltage and the first reference voltage and a gamma curve controller that receives the maximum gamma voltage and the minimum gamma voltage, and generates and outputs a plurality of gradation voltages.

Abstract: Provided are an output buffer circuit having an amplifier offset compensation function and a source driving circuit including the output buffer circuit. The output butler circuit may include a plurality of channel amplifiers, each of which is configured to adjust an amount of current flowing through transistors connected to at least one of a non-inverted input terminal and an inverted input terminal of a differential input unit to compensate an amplifier offset, and adjust buffer input voltage signals to generate output voltage signals.

Abstract: A display driver integrated circuit (IC) (DDI) includes a graphic memory that receives and stores line data including a plurality of pixel data blocks, an indicator generating circuit that compares the pixel data blocks of the line data received by the graphic memory with each other and generates an indicator signal corresponding to results of the comparison, and a read controller that performs a read operation with respect to the whole or a part of the line data from the graphic memory, based on a read command for the line data and the indicator signal.

Abstract: An image driving device includes a determining unit, and image processing unit, and a memory. The determining unit determines whether an input image is a moving image or a still image, and may be synchronized with an internal clock different from an external clock. The image processing unit may image-process at least one frame but less than all frames of the input image when the input image is determined to be a still image. The image processing unit may output the at least one image-processed frame as first image data, and the memory may store the first image data.