Abstract in simplified Chinese:本发明提到一种用于驱动液晶显示器之行之系统,其系包括:一逻辑电路(10),系于第一(VDD)与第二电源供应电压(VSS)之间的电源供应路径内进行操作,其中该第一电源供应电压(VDD)系高于该第二电源供应电压(VSS)。该逻辑电路(10)能够产生的是使从输入端中之第一逻辑信号(LOW╴FRAME,WHITE╴PIX)开始,到输出端中之第二逻辑信号(CP,CP╴N,CN,CN╴N)的数值等于该第一电源供应电压(VDD)或第二电源供应电压(VSS)。该设备包括两个扬升设备(11,12),系耦合于该逻辑电路(10)上且系于落在大于该第一电源供应电压(VDD)和第二电源供应电压(VSS)的第三电源供应电压(VLCD)与第二电源供应电压(VSS)之间的电源供应路径内进行操作,该扬升设备(11,12)能够提高该第二逻辑信号(CP,CP╴N,CN,CN╴N)的数值。该设备也包括第一(T11–T12)和第二L(T13–T14)对晶体管,系具有不同的电源供应路径且具有一共同的输出端子(OUT),该第一对晶体管(T11–T12)和第二对晶体管(T13–T14)系连接于该扬升设备(11,12)上以便定出一行的驱动信号。该设备包括的关闭电路(15)系于落在第三电源供应电压(VLCD)与第二电源供应电压(VSS)之间的电源供应路径内进行操作且系耦合于该两个扬升设备(11,12)上。该电路(15)能够在两个晶体管对(T11–T12,T13–T14)之一系处于操作条件内时于一画面的周期时间内使另一晶体管对(T11–T12,T13–T14)保持在关闭状态中。
Abstract in simplified Chinese:本发明说明的一种用于驱动液晶显示器之列之系统系包括至少一个模块(10)以驱动液晶显示器内一单一列,该模块所包括的转换器(T11–T12)系于落在该系统之第一电源供应导线(21)与第二电源供应导线(22)之间的电源供应路径内进行操作,该第一电源供应导线(21)所包括的第一设备(S1)能够使此导线连接到第一电源供应电压(VLCD)或第二电源供应电压(VA)上,且该第二电源供应导线(22)所包括的第二设备(S2)能够使此导线连接到第三电源供应电压(VB)或第四电源供应电压(VSS)上,该转换器(T11–T12)系由一逻辑电路(11–12)加以驱动并在输出端(OUT)上送出用以驱动该液晶显示器内单一列的驱动信号。
Abstract:
The present invention describes a system for driving rows of a liquid crystal display comprising at least one module (10) for driving one single row of the liquid crystal display. The module comprises an inverter (T11-T12) operating in a supply path between a first (21) and a second (22) supply line of the system, where the first supply line (21) comprises first means (S1) capable of connecting it to a first (VLCD) or to a second (VA) supply voltage and the second supply line (22) comprises second means (S2) capable of connecting it to a third (VB) or to a fourth (VSS) supply voltage. The inverter (T11-T12) is driven by a logic circuitry (11-12) and sends in output (OUT) a drive signal for one single row of the liquid crystal display.
Abstract:
The present invention refers to a system for driving columns of a liquid crystal display comprising a logic circuitry (10) operating in a supply path between a first (VDD) and a second (VSS) supply voltage in which the first supply voltage is (VDD) higher than the second supply voltage (VSS). The logic circuitry (10) is capable of generating starting from the first logic signals (LOW_FRAME, WHITE_PIX) in input second logic signals (CP, CN, CP_N, CN_N) in output whose value is equal to the first (VDD) or second (VSS) supply voltage. The device comprises two elevator devices (11, 12) coupled to the logic circuitry (10) and operating in a supply path between a third supply voltage (VLCD) greater than the first supply voltage (VDD) and the second supply voltage (VSS); the elevator devices (11, 12) are capable of raising the value of the second logic signals (CP, CN, CP_N, CN_N). The device also comprises a first (T11-T12) and a second (T13-T14) pair of transistors shaving different supply paths (VLCD-VA, VB-VSS) and having an output terminal (OUT) in common; the first (T11-T12) and the second (T13-T14) pair of transistors are connected to the elevator devices (11, 12) so as to determine the drive signal of a column. The device comprises turnoff circuitry (15) operating in a supply path between the third (VLCD) and the second supply voltage (VSS) and coupled to the two elevator devices (11, 12). The circuitry (15) is capable of keeping one of the two pairs of transistors (T11-T12, T13-T14) in a turnoff state in the period of time of a frame when the other of the two pairs of transistors (T11-T12, T13-T14) is in operative conditions.
Abstract:
A control device for a rectifier of a switching converter that includes a rectifier with at least one MOS transistor and a control device that is configured to generate a turn on and off signal for the at least one transistor. The control device also includes a measuring circuit to measure the conduction time of the body diode of the at least one transistor during each converter switching half-cycle. The control device is configured to, cycle by cycle: verify if the drain-source voltage of the at least one transistor is greater or less than a voltage threshold, and if the drain-source voltage is greater than the voltage threshold to turn off the at least one transistor, measure the conduction time of the body diode and increase the voltage threshold by a quantity in the next switching cycle.
Abstract:
A control device detects zero crossings of a current through a rectifier transistor during plural cycles; generates a turn-on signal of the transistor and inserts a turn-on delay equal to a fixed first quantity from the start time of for each cycle. The control device starts counting consecutive cycles after inserting the turn-on delay; detects whether a zero crossing of the current through the transistor after turning on said transistor has occurred; if no zero crossing is detected before counting a number N of consecutive cycles, decreases the turn-on delay by a fixed second quantity for the next cycle; if a zero crossing is detected, maintains turned on the transistor; if the turn-on delay is smaller than first quantity, increases the turn-on delay o for the next switching cycle; and if the turn-on delay is equal to the first quantity, maintains the turn-on delay for the next switching cycle.
Abstract:
Powering the internal circuitry, that is the controller of the power switch of a step-down DC-DC converter for a broad range of values of output voltage and achieving an enhanced energy saving in a low load conditions of operation is made possible by a method and implementing circuit based on defining two distinct thresholds of discrimination of the output voltage, both tied to a reference voltage, for generating two respective control signals and defining, from logical combinations of said two control signals, three distinct regions of operation of the converter upon the varying of electrical parameters, respectively identified by logical combinations of a pair of enabling signals.
Abstract:
A control device of a switching converter controls the closing and opening of a switch of the converter that regulates the operation of an inductor. The control device includes a ramp voltage generator, a switch control circuit configured to close the switch based on a comparison of the ramp voltage with a first signal and a generator control circuit configured to control the ramp voltage generator based on a value of a second signal representative of a current flowing through the inductor of the converter, in comparison with the value of a third signal.