Novatek Microelectronics Corp.

Chung-Wen Wu

Sih-Ting Wang

Wen-Chi Lin

Chien-Cheng Tu

Wen-Hsuan Lin

Jiun-Yi Lin

Chia-Chun Liu

Po-Hsiang Huang

Chiao-Wei Hsiao

Chung-Wen Hung

Min-Jung Chen

Kuo-Chi Chen

Chi-Han Lee

Po-Jui Huang

Chia-Hsing Hou

Yu-Lin Cheng

Yuan-Yung Liao

A synchronous backlight device and an operation method thereof are provided. The synchronous backlight device includes a pulse width modulation (PWM) control circuit and a backlight driving circuit. The PWM control circuit receives the video sync information from a video processing circuit and generates a PWM control signal. Wherein, the video sync information defines a plurality of video frame periods, the PWM control circuit at least divides each of the video frame periods into a first period and a second period, the lengths of the first periods of the video frame periods are equal to one another. The frequency of the PWM control signal in the first periods is different from the frequency of the PWM control signal in the second periods. The backlight driving circuit drives the backlight source of a display panel in accordance with the PWM control signal.

Synchronous backlight device and operation method thereof

A method of backlight control for a display panel is provided. The display panel is configured to display with a variable refresh rate in a plurality of frame periods each having a fixed period and a variable period. The method includes steps of: generating a first backlight control signal in the fixed period of a frame period; determining whether a liquid crystal (LC) transition time corresponding to the frame period ends before an end time of the variable period of the frame period; generating a second backlight control signal in the variable period of the frame period when the LC transition time ends before the end time of the variable period of the frame period; and generating a compensation backlight control signal in a next frame period according to a backlight duty cycle of the frame period.

Backlight control method and related display driver circuit for variable refresh rate display panel

The disclosure provides a display equipment, a brightness compensation device, and a brightness compensation method. The brightness compensation device includes a variable refresh rate (VRR) detection circuit and a control circuit. The VRR detection circuit and the control circuit receive a video stream from a video source device, and the video stream includes a VRR video frame. The VRR detection circuit detects a blanking period of the VRR video frame and generates a detection result. The control circuit outputs the frame data of the VRR video frame to the display device during the valid data period of the VRR video frame. The control circuit repeatedly outputs the frame data of the VRR video frame to the display device during the blanking period of the VRR video frame according to the detection result until the blanking period ends.

Display equipment, brightness compensation device and brightness compensation method

The disclosure provides a light cabinet, including multiple light boards and multiple light-board controllers. The light boards form a first light-board array of the light cabinet. The light-board controllers are arranged one-to-one on the light boards. The light-board controllers of the light boards in a first column of the first light-board array are connected in series to form a first controller string. The output terminal of the first controller string is connected electrically to an input terminal of a second controller string in a corresponding column of a second light-board array of another light cabinet. The input terminal of the first controller string is connected electrically to a first output terminal of a video data splitter (or an output terminal of a third controller string in a corresponding column of a third light-board array of yet another light cabinet).

Light cabinet suitable for forming light wall

A circuit arrangement for controlling a backlight source and an operation method are provided. The circuit arrangement includes a generator. The generator receives a sync signal and generates a pulse width modulation signal synchronous with the sync signal to control the backlight source. The sync signal indicates a frequency of a video including a series of image frames. The sync signal includes a sync period corresponding to a frame of the video. The pulse width modulation signal includes a first waveform pattern in a first sub-period of the sync period and a second waveform pattern in a second sub-period of the sync period. Each of the first waveform pattern and the second waveform pattern includes at least one active pulse. The first waveform pattern is substantially identical to the second waveform pattern.

Circuit arrangement for controlling backlight source and operation method thereof

An LED driving circuit and a light-emitting apparatus thereof are provided. The driving circuit includes a voltage providing unit, a voltage setting unit, a current feedback unit and a current dithering unit. The voltage providing unit receives a voltage setting signal and an input voltage to provide an emission driving voltage to a first terminal of an LED string. The voltage setting unit receives an emission feedback signal to provide a voltage setting signal. The current feedback unit provides the emission feedback signal and sequentially receives current setting voltages to sequentially set a driving current flowing through the LED string according to the current setting voltages. The current dithering unit receives the backlight control signal to sequentially provide the current setting voltages.

Light-emitting diode driving circuit and light-emitting apparatus thereof

An image processing unit including an always on circuit block and a non-always on circuit block is provided. When operating under a first operation mode, the non-always on circuit block receives a bias voltage from a power supply unit, so as to perform an image processing operation on an image input signal. When operating under a second operation mode, the non-always on circuit block stops receiving the bias voltage from the power supply unit, so as to stop the image processing operation, and at least a microcontroller of the non-always on circuit block is powered down. One of the always on circuit block and the non-always on circuit block controls the power supply unit to stop supplying the bias voltage to the non-always on circuit block according an event trigger signal, such that the non-always on circuit block enters the second operation mode from the first operation mode.

Image processing unit, image processing apparatus and image display system

A short detection circuit includes a voltage divider circuit, for generating, according to a bottom voltage of one or more light-emitting diode strings, a divided voltage less than the bottom voltage. Additionally, the short detection circuit includes a voltage clamp circuit, coupled to the voltage divider circuit, for clamping the divided voltage, and a comparator, coupled to the voltage divider circuit, for comparing the divided voltage and a reference voltage, to decide whether a short circuit occurs in the one or more light-emitting diode strings according to a result of the comparison.

Short detection circuit, light-emitting diode chip, light-emitting diode device and short detection method

An integrated backlight driving chip for driving a light-emitting diode backlight module includes a scaler circuit and a backlight driving circuit. The scaler circuit includes a digital control unit for generating a digital control signal, and a variable reference voltage generation unit for generating a reference voltage. The backlight driving circuit is coupled to the digital control unit, the variable reference voltage generation unit, and the LED backlight module, for generating a backlight driving signal according to the digital control signal and the reference voltage so as to drive the LED backlight module.

Integrated backlight driving chip and LED backlight device

A light-emitting diode driving device includes a light-emitting diode driving chip, for driving the one or more light-emitting diode strings according to a feedback voltage associated with the one or more light-emitting diode strings, and a voltage limiter, having a terminal coupled to the light-emitting diode driving chip and another terminal coupleable to the one or more light-emitting diode strings, for generating the feedback voltage for provision to the light-emitting diode driving chip according to a bottom voltage of the one or more light-emitting diode strings, and limiting the feedback voltage not to exceed a preset level.

Light-emitting diode driving device, light-emitting diode device, and method for driving the same

An image processing circuit and a light illumination module are provided. The light illumination module has an integrated circuit and a plurality of light emitting diode (LED) strings connected in parallel. The integrated circuit could be the image processing circuit. Each of the LED strings has a plurality of LEDs connected in series. The integrated circuit has a driving circuit coupled to the LED strings. The driving circuit supplies a driving voltage to first ends of the LED strings to drive the LED strings. The driving circuit is also configured to maintain a voltage value of the driving voltage obtained while all of the strings of the light emitting diodes are turned on, until all of the LED strings are turned on again. Accordingly, the interference of the LED strings is decreased, and the LED strings operate more stably.

Image processing circuit and light illumination module

A switching control method capable of continuously providing power is utilized for a power supply system having a first power supply unit and a second power supply unit. The switching control method includes generating a first input signal and a second input signal; performing a logical operation process on the first input signal and the second input signal to generate a first control signal; delaying the second input signal for a delay time to generate a second control signal; controlling a coupling relationship between the first power supply unit and a load according to the first control signal; and controlling a coupling relationship between the second power supply unit and the load according to the second control signal.

Switching control method capable of continuously providing power and related apparatus and power supply system

In a normal mode, the power supply is fed back in a close loop, but in a power saving mode, the power supply is fed back in an open loop. When it is detected that the power supply is continuously fed back in the open loop and in a substantially zero output status, the power supply circuit enters a power down status. If the back-stage circuit needs power supply again, then the feedback is switched to the close loop and the power supply circuit enters the normal mode.

Growing community of inventors

Yilan County, Taiwan

Chung-Wen Wu