公开(公告)号：US11631376B1

公开(公告)日：2023-04-18

申请号：US17574803

申请日：2022-01-13

Applicant: STMicroelectronics S.r.l.

Inventor： Gaetano L'Episcopo ,  Giovanni Conti ,  Carmelo Occhipinti ,  Mario Antonio Aleo

IPC: G09G3/34 ,  G09G3/36

Abstract: A non-emissive display includes a backlight controller sending a pulse during each sub-frame of a plurality of frames to row and column drivers that drive backlight zones. The row drivers count each pulse to keep a pulse count total, and reset the pulse count total when it is equal to a first number indicating how many row drivers are present. Each row driver activates its channels and waits for a next pulse if the pulse count total is not equal to the first number and if the pulse count total is equal to a second number indicating in which sub-frame that first driver is to be activated. Each row driver waits for a next pulse if the pulse count total is not equal to the first number and the second number. Each column driver activates its channel in response to receipt of each pulse.

公开(公告)号：US08803604B2

公开(公告)日：2014-08-12

申请号：US13758031

申请日：2013-02-04

Applicant: STMicroelectronics S.R.L.

Inventor： Giovanni Conti ,  Domenico Cristaudo ,  Stefano Corradi

IPC: H03G3/00

CPC classification number: H05B37/02 ,  G09G3/3233 ,  G09G3/3291 ,  G09G2320/0233 ,  G09G2330/028

Abstract: A control circuit is for generating upper and lower voltages that define a range of a data voltage for controlling a driving transistor of an electroluminescent component coupled to a supply line through the driving transistor. The control circuit may include a first input terminal configured to have a common voltage, and a pair of amplifiers coupled together at the first input terminal and configured to generate the upper voltage and the lower voltage to correspond to a difference between the common voltage and, respectively, first and second analog intermediate voltages representing respective threshold values of the upper voltage and of the lower voltage. The control circuit may include an auxiliary amplifier configured to adjust the upper voltage and the lower voltage based upon fluctuations of an input voltage, and generate the common voltage to correspond to the difference between the input voltage and a reference voltage.

Abstract translation: 控制电路用于产生限定用于控制通过驱动晶体管耦合到电源线的电致发光元件的驱动晶体管的数据电压的范围的上限和下限电压。 控制电路可以包括被配置为具有公共电压的第一输入端子和在第一输入端子耦合在一起的一对放大器，并且被配置为产生上限电压和较低电压以对应于公共电压之间的差， 分别表示表示上部电压和较低电压的相应阈值的第一和第二模拟中间电压。 控制电路可以包括辅助放大器，其被配置为基于输入电压的波动来调节上限电压和较低电压，并且产生公共电压以对应于输入电压和参考电压之间的差。

公开(公告)号：US11978416B2

公开(公告)日：2024-05-07

申请号：US17991152

申请日：2022-11-21

Applicant: STMicroelectronics S.r.l.

Inventor： Gaetano L'Episcopo ,  Giovanni Conti

IPC: G09G3/36 ,  G09G3/32

CPC classification number: G09G3/3611 ,  G09G3/32 ,  G09G2300/0842 ,  G09G2320/0257

Abstract: Display elements, each having anode and cathode terminals, are arranged into rows and columns. Each row has an anode-line coupled to the anode terminals for its display elements. Each column has a cathode-line coupled to the cathode terminals for its display elements. A switch for each anode-line selectively couples that anode-line to a storage capacitor, and a switch for each cathode-line selectively couples that cathode-line to the storage capacitor. A display driver activates the row driver for a given row and the column driver for a given column. A switch driver closes the switch for the cathode-line for the given column, then opens the switch for that cathode-line. The display driver deactivates the row driver for the given row, after closing the switch for the cathode-line for the given column. The switch driver closes the switch for the anode-line for the given row.

公开(公告)号：US11545082B1

公开(公告)日：2023-01-03

申请号：US17726909

申请日：2022-04-22

Applicant: STMicroelectronics S.r.l.

Inventor： Gaetano L'Episcopo ,  Giovanni Conti ,  Mario Antonio Aleo

IPC: G09G3/32 ,  G09G3/34 ,  G09G3/20 ,  G09G3/3225 ,  G09G5/10

Abstract: A method includes determining a number of drive pulses of equal width and amplitude that would drive LEDs with a total charge during a frame. If the width of the drive pulses is greater than a minimum-width and less than a maximum-width, the LEDs are driven with the drive pulses. If the width of the drive pulses is less than the minimum-width and an amplitude of the drive pulses is greater than a minimum-amplitude, decrement the amplitude of the drive pulses and recalculate the width of the drive pulses so each drive pulse has the decremented amplitude and recalculated width. If the amplitude of the drive pulses is equal to the minimum-amplitude, reduce the number of drive pulses and recalculate the width and amplitude of the reduced number of drive pulses. If the amplitude of the drive pulses is equal to the minimum-amplitude, the LEDs are not driven.

公开(公告)号：US11538427B1

公开(公告)日：2022-12-27

申请号：US17570788

申请日：2022-01-07

Applicant: STMicroelectronics S.r.l.

Inventor： Gaetano L'Episcopo ,  Giovanni Conti

IPC: G09G3/36 ,  G09G3/32

Abstract: Disclosed herein is a method of operating a display panel having a matrix of display elements. The method includes ordered steps of: (1) causing flow of current from a source of power, into an anode of a given display element, out of a cathode of the given display element to ground, wherein the flow of current into the anode and out the cathode to ground results in charging of a parasitic capacitance associated with the anode, (2) transferring charge from a storage capacitor to a parasitic capacitance associated with the cathode, and (3) stopping the flow of current, and then transferring charge from the parasitic capacitance associated with the anode to the storage capacitor.

公开(公告)号：US11978411B2

公开(公告)日：2024-05-07

申请号：US18120312

申请日：2023-03-10

Applicant: STMicroelectronics S.r.l.

Inventor： Gaetano L'Episcopo ,  Giovanni Conti ,  Carmelo Occhipinti ,  Mario Antonio Aleo

IPC: G09G3/34 ,  G09G3/36

CPC classification number: G09G3/3426 ,  G09G3/3611 ,  G09G2310/08 ,  G09G2330/021

Abstract: A non-emissive display includes a backlight controller sending a pulse during each sub-frame of a plurality of frames to row and column drivers that drive backlight zones. The row drivers count each pulse to keep a pulse count total, and reset the pulse count total when it is equal to a first number indicating how many row drivers are present. Each row driver activates its channels and waits for a next pulse if the pulse count total is not equal to the first number and if the pulse count total is equal to a second number indicating in which sub-frame that first driver is to be activated. Each row driver waits for a next pulse if the pulse count total is not equal to the first number and the second number. Each column driver activates its channel in response to receipt of each pulse.

公开(公告)号：US11710450B1

公开(公告)日：2023-07-25

申请号：US18071834

申请日：2022-11-30

Applicant: STMicroelectronics S.r.l.

Inventor： Gaetano L'Episcopo ,  Giovanni Conti ,  Mario Antonio Aleo

IPC: G09G3/32 ,  G09G3/34 ,  G09G5/10 ,  G09G3/20 ,  G09G3/3225

CPC classification number: G09G3/32 ,  G09G3/2022 ,  G09G3/2081 ,  G09G3/3225 ,  G09G3/3426 ,  G09G5/10 ,  G09G2320/0247 ,  G09G2320/064 ,  G09G2320/0633

Abstract: Driving a LED array includes determining total charge to be transferred to the LEDs during an image frame, and determining a number of drive pulses of equal width and amplitude that would drive the LEDs with nearly the total charge during display of the image frame. One of the drive pulses is modified so the drive pulses drive the LEDs with the total charge during display. If the width is greater than a minimum width and less than a maximum width, the LEDs are driven with the drive pulses. If the width is less than the minimum width and if an amplitude is greater than a minimum amplitude, the amplitude of the drive pulses is decremented. If the width is less than the minimum width and if the amplitude is equal to the minimum amplitude and if the number of drive pulses is greater than one, the number is decremented.