Synaptics Japan Gk

Synaptics Corporation

Renesas Electronics Corporation

Nec Electronics Corporation

Synaptics Display Devices Gk

Akio Sugiyama

Hirobumi Furihata

Takashi Nose

Masao Orio

Susumu Saito

Tomoo Minaki

Kazutoshi Aogaki

Yoshihiko Hori

Guozhong Shen

Yoshiki Kurokawa

Toshio Mizuno

Kiyoshi Miyazaki

Chirinjeev Singh

Takashi Tahata

Kota Kitamura

Dipankar Talukdar

Masaaki Okawa

A display device includes a display panel, a backlight module, and backlight control circuitry. The backlight module is configured to illuminate the display panel, the backlight module comprising a plurality of light sources. The backlight control circuitry is configured to control first luminance of a first light source of the plurality of light sources based at least in part on a first weighted average of brightness values for a first set of pixels of the display panel.

Backlight control for display devices

A display driver includes an image processing circuit and a driver circuit. The image processing circuit is configured to: receive input image data corresponding to an input image; generate first subpixel rendered data from a first part of the input image data for a first display region of a display panel using a first setting; and generate second subpixel rendered data from a second part of the input image data for a second display region of the display panel using a second setting different from the first setting. The first pixel layout is different than the second pixel layout. The driver circuit is configured to update the first display region of the display panel based at least in part on the first subpixel rendered data and update the second display region of the display panel based at least in part on the second subpixel rendered data.

Subpixel rendering for display panels including multiple display regions with different pixel layouts

A display driver includes image processing circuitry and driver circuitry. The image processing circuitry is configured to process first image data for pixels of a display panel comprising a first region and a second region to generate output voltage data. The first region and the second region have different pixel layouts. The driver circuitry is configured to update the pixels based on the output voltage data. Processing the first image data comprises IR-drop compensation based on first luminances of the pixels, each of the first luminances being determined based on the first image data and whether a corresponding pixel of the pixels is located in the first region.

IR-drop compensation for a display panel including areas of different pixel layouts

A display driver includes image processing circuitry, driver circuitry, and test circuitry. The image processing circuitry is configured to generate first output data during a first display update period and generate second output data during a second display update period. The driver circuitry is configured to update a display panel based on the first output data during the first display update period and update the display panel based on the second output data during the second display update period. The test circuitry is configured to test the image processing circuitry during a test period disposed between the first display update period and the second display update period.

Built-in test of a display driver

A display driver comprises gamma processing circuitry, compensation circuitry, and driver circuitry. The gamma processing circuitry is configured to process the image data to generate gamma processed image data. The compensation circuitry is configured to process the gamma-processed image data, based on a ratio of a number of display elements that emit light to a total number of display elements of a display panel, to generate compensated image data. The driver circuitry is configured to drive the display panel based on the compensated image data.

Device and method for driving a self-luminous display panel

A display driver includes control circuitry and image processing circuitry. The control circuitry is configured to store first and second predetermined gamma curve defined for first and second regions of a display panel, respectively, the first region having a different pixel layout than the second region. The control circuitry is further configured to determine first and second modified gamma curves by scaling the first and second predetermined gamma curves with a common scale factor. The image processing circuitry is configured to apply a first gamma transformation based on the first modified gamma curve to a first graylevel defined for a first pixel circuit located in the first region to determine a first output voltage level and apply a second gamma transformation based on the second modified gamma curve to a second graylevel defined for a second pixel circuit located in the second region to determine a second output voltage level.

Device and method for driving a display panel

A display driver includes gamma curve control circuitry and a converter controller. The gamma curve control circuitry is configured to generate a first gamma curve for a first display brightness value (DBV), and a second gamma curve for a second DBV lower than the first DBV. The converter controller is configured to control a digital-analog converter (DAC) configured to perform digital-analog conversion of an input image data. Further, the converter controller is configured to adjust an analog signal voltage amplitude of the DAC based on a range of an output voltage associated with the second gamma curve.

Device and method for display brightness control

A display driver comprises signal supply circuitry and control circuitry. The control circuitry is configured to generate a first luminance value using a DBV. The signal supply circuitry is configured to supply to a display panel at least one signal using the first luminance value. The first luminance value has a one-to-one correlation with the display brightness level. The DBV does not have a one-to-one correlation with the display brightness level.

Device and method for brightness control of display device based on display brightness value encoding parameters beyond brightness

The display driver includes control circuitry and signal supply circuitry. The control circuitry is configured to store a first setting table for a first frame rate and a second setting table for a second frame rate. The control circuitry is further configured to, in response to adjusting a frame rate of a display device from the first frame rate to the second frame rate, generate an interpolated control parameter through interpolation of a first control parameter obtained from the first setting table and a second control parameter obtained from the second setting table. The signal supply circuitry is configured to generate at least one first signal to be supplied to a display panel based on the interpolated control parameter.

Device and method for controlling a display panel

A display driver comprises color gamut adjustment circuitry and drive circuitry. The color gamut adjustment circuitry is configured to generate an in-use parameter set based on a plurality of parameter sets corresponding to different color gamuts and a position of a target pixel and generate an output pixel data by performing color gamut adjustment processing on an input pixel data of the target pixel based on the in-use parameter set. The drive circuitry is configured to drive a display panel based on the output pixel data.

Device and method for color gamut adjustment

An image processing apparatus includes: a first circuit which calculates values f(R), f(G) and f(B) by applying a function f(x) to an R grayscale value R, a G grayscale value Gand a B grayscale value Bof each pixel i of a first image; a second circuit which calculates values f(R), f(G) and f(B) by applying the function f(x) to an R grayscale value R, a G grayscale value Gand a B grayscale value Bof each pixel i of a second image; and a similarity calculation circuit which calculates a degree of similarity between the first and second images depending on |f(R)&#x2212;f(R)|, |f(G)&#x2212;f(G)| and |f(B)&#x2212;f(B)| associated with each pixel i of the first and second images. The function f(x) is a convex function monotonically non-decreasing in the domain of definition.

Calculation of degree of similarity between two images

Provided is a color adjustment method for a display apparatus. The color adjustment method includes: measuring first luminance coordinate data indicating a luminance and color coordinates of a color displayed on a display device when image data corresponding to a white point is supplied to a drive circuitry; measuring second luminance coordinate data indicating luminances and color coordinates of colors displayed on the display device when image data corresponding to the white color of intermediate grayscale values are supplied to the drive circuitry; measuring third luminance coordinate data indicating a luminance and color coordinates of a color displayed on the display device for each of R, G and B elementary color points when image data corresponding to each of the R, G and B elementary color points is supplied to the drive circuitry; and calculating correction parameters based on the first to third luminance coordinate data.

Method and device for display color adjustment

A display panel driver includes an image data generator, a brightness correction circuit performing a correction calculation on image data, a drive section driving the display panel in response to corrected image data; and a display timing generator outputting a timing control signal. The correction calculation by the brightness correction circuit is adjustable. When the display panel driver is placed into a test mode, the display timing generator is configured to output an internally-generated timing control signal and the image data generator outputs internally-generated evaluation image data. The evaluation image data are generated so that the evaluation images are switched from one to another in response to the internally-generated timing control signal.

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Tokyo, Japan

Akio Sugiyama