Abstract: An exemplary backlight system includes a power input circuit (21), a detection circuit (27), a control circuit (28), a light emitting diode driving circuit (25), and a light emitting diode array (26). The detection circuit is configured to detect a connection state of the power input circuit with respect to an external power source, and send a corresponding connection states signal to the control circuit. The control circuit is configured to output a control signal to the light emitting diode driving circuit according to the connection state signal. The light emitting diode driving circuit is configured to drive or shut down the light emitting diode array according to the control signal.

Abstract: A display device includes a control circuit, a data driving circuit, a gate driving circuit, and a display panel comprising a display region. The control circuit determines a located orientation of the display panel, sets a display-mode state parameter according to the located orientation of the display panel, and outputs control signals to the data driving circuit and the gate driving circuit according to the display-mode state parameter. The data driving circuit outputs data signals of an image along a first shift direction according to corresponding control signals to the display region, and the gate driving circuit outputs gate signals along a second shift direction according to corresponding control signals to the display region.

Abstract: An exemplary liquid crystal display includes a plurality of pixel units each including a pixel electrode for receiving data voltages and a common electrode for receiving a common voltage having a constant value. The data voltages applied to each pixel electrodes are equal a sum of a main data voltage having a square waveform and an auxiliary voltage that is periodically changed at intervals each formed by four continuous frames. An absolute value of the auxiliary voltage is less than a voltage difference between the main data voltage and the common voltage. A sum of the auxiliary voltage is zero in a minimum period.

Abstract: An exemplary backlight control circuit for changing a brightness of a light source includes a coarse adjusting circuit and a fine adjusting circuit. The coarse adjusting circuit is configured to coarsely adjust a DC voltage according to one received coarse adjusting signal. The fine adjusting circuit is configured to finely adjust the DC voltage according to one received fine adjusting signal. A change of the DC voltage generated by the coarse adjusting circuit is greater than another change of the DC voltage generated by the fine adjusting circuit.

Abstract: A common voltage generating circuit includes a square wave generating unit, a diode, a NOT gate, a first capacitor, a second capacitor, a third capacitor, a first resistor, a second resistor, and an output terminal. The square wave generating unit includes an output terminal, which is coupled to the output terminal of the common voltage generating circuit via the first resistor, a positive terminal of the diode, a negative terminal of the diode, and the second resistor in series. The output terminal of the square wave generating unit is coupled to the negative terminal of the diode via the NOT gate and the first capacitor. The positive terminal of the diode is grounded via the second capacitor, and the output terminal of the common voltage generating circuit is grounded via the third capacitor. A duty ratio of the output square wave generating unit is capable of being modulated.

Abstract: An exemplary power control circuit (24) includes a scaler circuit (245) configured for outputting a control signal, a voltage converter (27) configured for converting a received voltage into a plurality of desired voltages, a first control unit (28), a second control unit (29), and a coupling circuit (26). The first control unit is configured for controlling whether a first voltage is applied to the voltage converter. The second control unit is configured for controlling whether to transmit a second voltage applied thereto. The coupling circuit is between the first and second control units. The coupling circuit enables the second control unit to function ahead of the voltage converter according to the control signal.

Abstract: A liquid crystal display (1) includes a liquid crystal panel (12) including a number of thin film transistors (123), a timing control circuit (16), a common voltage generating circuit (14) and a gamma circuit (13). The timing control circuit is configured for generating timing signals. The common voltage generating circuit is configured for generating a common voltage. The gamma circuit is configured for generating gray-scale voltages. When the liquid crystal panel is powered on, the common voltage is applied to the liquid crystal panel and reaches a predetermined value before the gray-scale voltages are applied to the liquid crystal panel and comes to predetermined values. And when liquid crystal panel is powered off the common voltage and the gray-scale voltages drops to 0V simultaneously by control of the common voltage generating circuit and the gamma circuit with the thin film transistors switched on.

Abstract: An exemplary liquid crystal display (300) includes a liquid crystal panel (301) receiving reference voltages; and a polarity resetting circuit (354) receiving display signals from external circuit and resetting the received display signals to attain resetted display signals, which makes the voltage difference between the resetted display signals and the previous frame display signals smaller than that between the corresponding received display signals and the previous frame display signals.

Abstract: An exemplary backlight modulation circuit (2) includes a first modulation section (220), a second modulation section (221), and a backlight modulation section (240). The first modulation section is configured to generate a first backlight modulation signal. The second modulation section is configured to generate a second backlight modulation signal. The backlight modulation section is configured to modulate illumination of an associated backlight module according to the first and second backlight modulation signals.

Abstract: An exemplary liquid crystal display (LCD) provides data lines, gate lines, and pixel units arranged as a matrix array. A method for driving the LCD includes a step of analyzing and determining polarities of one column of the pixel units as determining pixels, thereby defining a first polarity group and a second polarity group, and a step of sequentially applying corresponding data signals to a part of the whole pixel units that are arranged at same rows with the first polarity group in a part of a period of a frame. Corresponding data signals are sequentially applied to the other part of the whole pixel units that are arranged at same rows with the second polarity group in another part of a period of a frame.

Abstract: An exemplary liquid crystal display (20) includes a plurality of pixel units (240) each including a pixel electrode (26) and a common electrode (22), a data driving circuit (33) providing a plurality of data voltages to each pixel electrode, a common voltage generating circuit (34) providing a common voltage to each common electrode, and a gamma voltage generating circuit (35) providing gamma voltages to the data driving circuit. The plurality of pixel units are arranged in a matrix. The voltage difference between the data voltage and the common voltage in each pixel unit is a sum of a main voltage and an auxiliary voltage with periodical change. An absolute value of the main voltage is constant. An absolute value of the auxiliary voltage is less than the absolute value of the main voltage. A sum of the auxiliary voltage is zero in a minimum period.

Abstract: A liquid crystal display (300) includes a liquid crystal panel (310) having a plurality of pixels P(i,j) arranged in a matrix, a brightness identification unit (343) configured for identifying a brightness of an image element to be displayed by at least one pixel, a polarity analyzing unit (344) configured for analyzing a result of the identification, and a data circuit (330). The polarity analyzing unit is also configured for generating a composed binary signal having a first binary portion the same as the primary display signal and an additive second binary portion. The data circuit is configured to provide a data voltage to drive the pixel according to the signal. A value of the data voltage is determined by a first binary portion of the composed binary signal, and a polarity of the pixel is determined by the second binary portion of the composed binary signal.

Abstract: An exemplary digital photo frame includes an image memory configured for storing a display image, a display device configured for reading and displaying the display image, an infrared sensor configured for detecting infrared light, generating a first detecting signal when the infrared light is detected, generating a second detecting signal when the detected infrared light is no longer detectable, and a camera control circuit including a reference image therein. The camera control circuit generates an instant image and compares the instant image with the reference image when the first detecting signal is generated. The digital photo frame is configured to operate in a monitor mode or a display mode according to a comparing result when the infrared light is detected.

Abstract: An exemplary backlight control circuit includes an inverter, a pulse width modulation (PWM) circuit, and a frequency setting circuit. The inverter is configured to provide an alternating current voltage to a lamp. The PWM circuit is configured to provide a pulse control signal to the inverter. The frequency setting circuit is configured to regulate a frequency of the pulse control signal provided by the PWM circuit according to a temperature of the lamp.

Abstract: A liquid crystal display (LCD) includes an interface circuit configured to provide a test enable signal when the liquid crystal display is in a test mode; a timing control circuit configured to provide build in system test (BIST) data signals corresponding to at least one predetermined BIST image and a high voltage stress (HVS) start signal according to the test enable signal; a DC/DC converter configured to generate test-related voltages in response to the HVS starting signal; a data driver configured to provide a plurality of test gray voltage signals according to the BIST data signals and the test-related voltages; a scanning driver configured to provide a plurality of test scanning signals according to the test-related voltages; and a liquid crystal panel configured to receive the test gray voltage signals and test scanning signals. A method for testing an LCD is also provided.

Abstract: A display device includes a gamma adjustment circuit employing a method for adjusting red, green, blue (R, G, B) data of an image signal. The gamma adjustment circuit provides at least one look up table (LUT) to store gamma correction values, determines whether at least two kinds of color data from the R, G, B data require adjustment, searches for gamma correction values corresponding to the at least two kinds of color data from the R, G, B data requiring adjustment in the at least one LUT, and outputs the R, G, B data and the gamma correction values corresponding to the at least two kinds of color data from the R, G, B data requiring adjustment.

Abstract: A liquid crystal display includes a liquid crystal panel, a gray scale correction circuit, a control circuit, and a data driver. The gray scale correction circuit provides a corrected red, green, blue (RGB) data set corresponding to a white image element. The control circuit receives an original RGB data set, and selectively outputs one of the original RGB data set and a corrected RGB data set according to a gray scale value of the of the original data set. The data driver provides a gray scale voltage to the liquid crystal panel according to the output RGB data set of the control circuit.

Abstract: An exemplary backlight control circuit includes an inverter, a pulse width modulation (PWM) circuit, and a frequency setting circuit. The inverter is configured to provide an alternating current voltage to a lamp. The PWM circuit is configured to provide a pulse control signal to the inverter. The frequency setting circuit configured to regulate a frequency of the pulse control signal provided by the PWM circuit according to an environment temperature.

Abstract: A backlight adjusting system and method is adapted for adjusting a backlight brightness of a light emitting element for a display panel based on an ambient light around the display panel. The backlight adjusting system includes a first calculator, a processor and a driver. The first calculator calculates a target display brightness value of the display panel based on an actual ambient brightness value of the ambient light, a predetermined optimal ambient brightness value of the ambient light, and a predetermined optimal display brightness value of the display panel determined according to the predetermined optimal ambient brightness value. The processor obtains a target pulse duty value based on the target display brightness value. The driver generates a driving signal based on the target pulse duty value utilizing pulse width modulation techniques for driving the light emitting element so as to adjust the backlight brightness of the light emitting element.

Abstract: An exemplary liquid crystal display (LCD) device includes a liquid crystal pane and a gamma correction module. The liquid crystal panel includes a plurality of pixels including normal pixels and abnormal pixels. For a same gray scale, the normal pixels are driven by a first gray scale signal and the abnormal pixels are driven by a second gray scale signal, in order that the brightness of an image displayed by the normal pixels and the brightness of the image displayed by the abnormal pixels are substantially identical.