Abstract:
A data driver includes a data signal converter to convert image data to a data signal, an output buffer to output the data signal to a data line, a first cascode circuit connected to the output buffer and including a plurality of transistors, a first noise attenuator connected to a first node between the output buffer and the first cascode circuit, and to attenuate a first current noise, a second cascode circuit connected to the output buffer and including a plurality of transistors, a second noise attenuator connected a second node between the output buffer and the second cascode circuit, and to attenuate a second current noise, a current integrator to generate an integrated voltage by integrating a first current flowing through the first cascode circuit and a second current flowing through the second cascade circuit, and an analog-digital converter (ADC) to convert the integrated voltage to a digital signal.
Abstract:
A temperature sensing device includes a first frequency generator for generating a first clock signal having a first frequency that is constant regardless of a temperature; a second frequency generator for generating a second clock signal having a second frequency that is changed according to the temperature; and a data holding unit for outputting a temperature code indicating a number of pulses of the second clock signal counted for a reference time at which a number of pulses of the first clock signal reaches a predetermined threshold. The temperature sensing device does not require a reference clock signal input from the outside and is insensitive to the change in the process, thereby being capable of improving the performance of the temperature sensing device.
Abstract:
A pixel of an organic light emitting diode (OLED) display device includes a first transistor having a gate connected to a scan line, a first terminal connected to a data line, and a second terminal, a capacitor having a first electrode connected to the second terminal of the first transistor and a second electrode connected to a first power supply voltage, a second transistor having a gate connected to the first electrode of the capacitor, a first terminal connected to the first power supply voltage, and a second terminal, an OLED having an anode connected to the second terminal of the second transistor and a cathode connected to a second power supply voltage, and a third transistor having a gate connected to a first sensing gate line, a first terminal connected to a sensing line, and a second terminal connected to the anode of the OLED.
Abstract:
An organic light emitting display device includes a display panel, current measuring circuits, and a timing controller. The display panel includes a plurality of pixel blocks. The current measuring circuits measure driving currents of pixels in the pixel blocks. The timing controller adjusts data signals applied to the pixels based on values measured by the current measuring circuits. One of the current measuring circuits measure driving currents of the pixels in a corresponding one of the pixel blocks, and also a driving current of at least one overlapped pixel.
Abstract:
A display device and an image compensation method are disclosed. One inventive aspect includes a controller and a data driver. The controller processes image data signal based on at least one of pixel information, a reference brightness condition, a present brightness of the display device and a target luminance and generate final compensated data. The pixel information is measured under the reference brightness condition. The data driver transmits the final compensated data to an activated driving pixel.
Abstract:
A display device includes: a display including a plurality of pixels; and a controller configured to: receive an external input image signal, adjust the external input image signal to compensate for brightness deviations of the pixels, and transmit corresponding image data signals to the pixels, wherein the controller includes: a data input section configured to receive the external input image signal and transmit a test image data signal to the pixels through a data driver, a luminance information extracting section configured to: extract brightness information for the pixels after displaying a test image in accordance with the test image data signal, and calculate first, second, and third parameters, using the brightness information, and a data compensating section configured to generate the image data signals by adjusting the external input image signal based on the first, second, and third parameters.
Abstract:
A pixel luminance compensating unit is disclosed. In one aspect, the disclosed pixel luminance compensating unit includes an uncompensated gray-level region processing unit configured to generate first output-data by processing first input-data corresponding to a first portion of an input luminance curve corresponding to an uncompensated gray-level region. The disclosed unit further includes a compensated gray-level region processing unit configured to generate second output-data by processing second input-data corresponding to a second portion of the input luminance curve corresponding to a compensated gray-level region. The disclosed unit further includes an interpolated gray-level region processing unit configured to generate third output-data by processing third input-data corresponding to a third portion of the input luminance curve corresponding to an interpolated gray-level region, wherein the interpolated gray-level region processing unit is configured to generate the third portion by interpolating between the first portion and the second portion.
Abstract:
A display device and an image compensation method are disclosed. One inventive aspect includes a controller and a data driver. The controller processes image data signal based on at least one of pixel information, a reference brightness condition, a present brightness of the display device and a target luminance and generate final compensated data. The pixel information is measured under the reference brightness condition. The data driver transmits the final compensated data to an activated driving pixel.
Abstract:
A pixel luminance compensating unit is disclosed. In one aspect, the disclosed pixel luminance compensating unit includes an uncompensated gray-level region processing unit configured to generate first output-data by processing first input-data corresponding to a first portion of an input luminance curve corresponding to an uncompensated gray-level region. The disclosed unit further includes a compensated gray-level region processing unit configured to generate second output-data by processing second input-data corresponding to a second portion of the input luminance curve corresponding to a compensated gray-level region. The disclosed unit further includes an interpolated gray-level region processing unit configured to generate third output-data by processing third input-data corresponding to a third portion of the input luminance curve corresponding to an interpolated gray-level region, wherein the interpolated gray-level region processing unit is configured to generate the third portion by interpolating between the first portion and the second portion.
Abstract:
A temperature sensing device includes a first frequency generator for generating a first clock signal having a first frequency that is constant regardless of a temperature; a second frequency generator for generating a second clock signal having a second frequency that is changed according to the temperature; and a data holding unit for outputting a temperature code indicating a number of pulses of the second clock signal counted for a reference time at which a number of pulses of the first clock signal reaches a predetermined threshold. The temperature sensing device does not require a reference clock signal input from the outside and is insensitive to the change in the process, thereby being capable of improving the performance of the temperature sensing device.