Samsung Electronics Co., Ltd.

Hyundai Mobis Co., Ltd.

Jae-hyuck Woo

Jae-Goo Lee

Won-sik Kang

Jong-Kon Bae

In-Suk Kim

Yang-Hyo Kim

Byung-Hun Han

In-suk Kim

Yun-ho Choi

Kyu-Young Chung

Hyung-Tae Kim

Chul Jun Choi

Ji-Woon Jung

Jae Goo Lee

Seong-Cheol Kim

Keon Lee

Yeon-Ho Kim

Jao-goo Lee

Sung-jin Jang

Ji-Hoon Lim

Min-Ji Park

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.

Integrated circuit test apparatus

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.

Image driving device, electronic device including image driving device, and image driving method

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.

Display driving device for driving each of more than two pixels, display apparatus and method for operating the same

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.

Buffer circuit having amplifier offset compensation and source driving circuit including the same

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.

Display driving circuit and a display device having the same

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.

Gradation voltage generator and display driving apparatus

A display driver circuit configured to be shared by three grey-scale voltage generators to be respectively used with red (R), green (G) and blue (B) colors. In particular, two of the three grey-scale voltage generators share first and second resistor strings, gamma voltage selectors, and gamma adjustment buffers provided in the other grey-scale voltage generator, thereby reducing the size and power consumption of the display driver circuit. Also, when only a single grey-scale voltage is output, it is possible to deactivate the grey-scale voltages provided by two of the grey-scale generators and further reduce power consumption.

Display driver circuit

A gamma voltage controller includes a gamma distribution unit that generates a plurality of voltages by performing voltage divisions between a first gradation voltage and a N(th) gradation voltage, a gamma selection unit having first through M(th) gamma selectors that respectively select first through M(th) gamma voltages among the plurality of voltages, a gamma buffer unit that changes inflection points of the gamma curve, and buffers the first through M(th) gamma voltages to output buffered first through M(th) gamma voltages, and a gradation distribution unit that generates second through N&#x2212;1(th) gradation voltages by performing voltage divisions among the buffered first through M(th) gamma voltages. Each of the buffers includes a feedback loop, and some of the buffers change inflection points of the gamma curve.

Gamma voltage controller, gradation voltage generator and display device having the same

A liquid crystal display (LCD) that includes a plurality of pixels, a switch unit, and a gate line driving unit. Each of the pixels includes a liquid crystal capacitor having a pixel electrode and a common electrode, and the pixels are located at intersections of a plurality of gate lines and a plurality of source lines. The switch unit applies source line driving voltages having levels opposite to a common voltage applied to the common electrode, to the source lines. The gate line driving unit sequentially outputs via gate lines gate line driving voltages to control the source line driving voltages to be applied to the pixel electrodes of the pixels. The common voltage transits from a first level to a second level or vice versa at the boundary between a first half frame and a second half frame. At the first half frame, the switch unit applies the source line driving voltages to only odd-numbered source lines. At the second half frame, the switch unit applies the source line driving voltage to only even-numbered source lines.

Liquid crystal display device and method of driving the same

A method and apparatus for generating gradation voltages are provided. Maximum and minimum reference voltages are selected from a distribution of voltages ranging from a first source voltage to a second source voltage. The maximum reference voltage is selected as a 1gradation voltage and the minimum reference voltage is selected as an Ngradation voltage, or vice versa, in response to an inversion control signal, where N is a natural number. First to Mgamma voltages are selected from among a plurality of voltages generated by a voltage distribution between the 1gradation voltage and the Ngradation voltage. Second to (N&#x2212;1)gradation voltages are generated from a voltage distribution between the 1gradation voltage and the Ngradation voltage, using the 1gamma voltage to the Mgamma voltage, where M is a natural number.

Method and apparatus for generating gradation voltage for X-axis symmetric gamma inversion

Methods of driving source lines and/or circuits/systems for driving source lines are provided. Source lines of a display device are driven by comparing first data for driving a first buffer associated with a first source line of the display device and second data for driving a second buffer associated with a second source line of the display device and selectively disabling the second buffer and driving the second source line of the display device with the first buffer based on the comparison of the first and second data.

Shared buffer display panel drive methods and systems

A supply voltage removal detecting circuit, a display device and method for removing a latent image when a supply voltage is disconnected, in which the supply voltage removal detecting circuit includes a voltage controller, a detection signal generator, and an output unit. The voltage controller controls voltages such that when a first supply voltage and a second supply voltage stay at a first level, the voltage at a first node is greater than the voltage at a second node, and when the first supply voltage or the second supply voltage becomes a second level, the voltage at the second node stays at a specific level, and the voltage at the first node is less than the specific level. The detection signal generator generates a detection signal by comparing the voltage at the first node with the voltage at the second node. The output unit prevents the voltage controller and the detection signal generator from faulty operations, and inverts the detection signal in response to an operation enabling signal to output a detection control signal.

Supply voltage removal detecting circuit, display device and method for removing latent image

A source driver and a source line driving method capable of removing the offset effect of an amplifier for every two frames. The source driver includes an amplification unit, an input controller and an output controller. The amplification unit includes a positive amplifier outputting an output voltage having a positive deviation relative to an input voltage applied thereto and a negative amplifier outputting an output voltage having a negative deviation relative to an input voltage applied thereto. The input controller transfers a first gray-level voltage corresponding to a driving voltage of a first source line and a second gray-level voltage corresponding to a driving voltage of a second source line adjacent to the first source line to the amplification unit in response to input positive control signals or input negative control signals. The output controller applies the output voltage of the positive amplifier or the output voltage of the negative amplifier to the first or second source line in response to output positive control signals or output negative control signals.

Source driver capable of removing offset in display device and method for driving source lines of display device

Embodiments of the present invention provide a method for driving a liquid crystal display (LCD) device using gray-scale voltages whose dynamic ranges are different from each other depending on pixel color. The gray-scale voltages are output to a source line driver. Embodiments of the invention also provide a gray-scale voltage generation circuit coupled to a LCD source line driver. The disclosed method and circuit reduce coupling phenomena in source lines to substantially remove artifacts such as stripes or flicker in an LCD device.

Growing community of inventors

Osan-si, South Korea

Jae-hyuck Woo