KR0124982B1 - Contrast and brightness control device of liquid crystal display elements - Google Patents

Abstract

An apparatus for controlling the luminance and the brightness of LCD using a non-volatile potentiometer having an input part ordering the control of the luminance or the brightness which user wants a system operating all apparatus according to the signal of the input part, a decoder generating the motion control signal corresponding to the order of the system, a non-volatile potentiometer control part correcting time from switch ON to OFF, a non-volatile potentiometer receiving the control signal from the non-volatile potentiometer control part to control and store the resistance value and a LCD which its non-volatile potentiometer luminance and brightness are controled by the signal outputted from the non-volatile potentiometer is disclosed.

Description

Luminance and Brightness Control Device of Liquid Crystal Display Using Nonvolatile Potentiometer

1 is a configuration circuit diagram of a luminance and brightness adjusting device of a liquid crystal display device using a conventional nonvolatile potentiometer.

2 is a block diagram illustrating a configuration of a luminance and brightness controller of a liquid crystal display device using a nonvolatile potentiometer according to an exemplary embodiment of the present invention.

3 shows input and output signals of a decoder in a luminance and brightness controller of a liquid crystal display device using a nonvolatile potentiometer according to an embodiment of the present invention.

4 is a circuit diagram of a nonvolatile potentiometer control unit in the luminance and brightness controller of the liquid crystal display device using the nonvolatile potentiometer according to the embodiment of the present invention.

* Explanation of symbols for the main parts of the drawings

XA (0) ~ XA (9): address of input / output port,

SD (0): Switch down code to replace switch

SD (1): Switch up code to replace the switch,

IOW: System control signal for designating input / output light,

CON_NS: chip select signal for brightness control

CON_U / D: luminance up / down signal,

CON_SAVE: Signal fed back to the decoder for brightness control

BRI_CS: Chip select signal for brightness control

BRI_U / D: brightness up / down signal,

BRI_SAVE: Signal fed back to decoder to adjust brightness

The present invention relates to a brightness and brightness control device of a liquid crystal display device using a nonvolatile potentiometer. More specifically, the brightness and brightness of a liquid crystal display device mainly used as a screen of a notebook personal computer or a pen personal computer. The present invention relates to a device for adjusting brightness and brightness of a liquid crystal display device using a nonvolatile potentiometer for making the notebook personal computer or the pen personal computer lighter and smaller.

A potentiometer is a resistor that adjusts a resistance value by moving a wiper with one or several adjustment slide contacts. Since it has a voltage divider function, it is widely used in various control devices. It is also used in the control device to adjust.

Recently, the potentiometer has been integrated into a microprocessor and an analog interface. In addition, the integrated potentiometer is non-volatile, and is characterized by being digitally controlled and maintained just before the power is reset.

In order to use the integrated non-volatile potentiometer for controlling the brightness and brightness of the liquid crystal display, a control device for generating a control signal for driving the integrated nonvolatile potentiometer is required.

Hereinafter, with reference to the accompanying drawings will be described with respect to the brightness and brightness control apparatus of the liquid crystal display device using a conventional nonvolatile potentiometer.

1 is a configuration circuit diagram of a luminance and brightness control device of a liquid crystal display device using a conventional nonvolatile potentiometer.

As shown in FIG. 1, the configuration of a brightness or brightness control device of a liquid crystal display device using a conventional nonvolatile potentiometer is a switch 10 for inputting a command to up or down the brightness or brightness by mechanical operation. And a Schmitt trigger negative AND gate (N1) having two input terminals connected to an output terminal of the switch 10 and respectively connected to two power supplies V _CC through resistors R1 and R2, and the Schmitt trigger. Schmitt trigger negative connected to the output terminal of negative AND gate (N1) and contacting through parallel connection of forward diode (D1) and resistor (R3) as one input terminal, and receiving power supply (V _CC ) to the other input terminal. The AND gate N2, a capacitor C1 inserted into a portion connected to ground at a contact connected to one input terminal of the Schmitt trigger negative AND gate N2, and the Schmitt trigger negation logic Schmitt-triggered negation with the output terminal of gate N1 and the contact through parallel connection of diode D2 and resistor R4 on the reverse side as one input terminal, and with the other input terminal connected via ground and condenser C3 A nonvolatile potentiometer control unit including a logic gate N3, a resistor R5 connecting the output terminal of the Schmitt-triggered negative logic gate N3 and its other input terminal, and a capacitor C2 connected to the ground; 20), an up / down (U / D) terminal for receiving a signal output from the switch 10, and an output signal of a Schmitt trigger negative AND gate N2 in the nonvolatile potentiometer controller 20. The chip select terminal (/ CS) and the increment (/ INC) terminal for receiving the output signal of another Schmitt trigger negative AND gate (N3) are input terminals, and the ground is connected to the high voltage terminal (V _h ). To the low voltage (V _l ) A nonvolatile potentiometer (Ch1) (in the present invention, Xcor uses X9CMME) that connects a -5V power supply _and sends an output signal to the wiper voltage terminal (V _W ), _and the output terminal of the wiper voltage terminal (V _W ). Is connected to the positive input terminal, the negative input terminal is grounded through a resistor (R7) and the non-volatile potentiometer section 30 made of an operational amplifier (I1) for negative feedback of the output terminal, and the nonvolatile potentiometer unit A signal output from 30 is composed of a liquid crystal display element 40 whose brightness and brightness are adjusted.

The operation of the brightness and brightness control device of the liquid crystal display device using the conventional nonvolatile potentiometer Ch1 is as follows.

When the up or down button of the switch 10 is pressed, it is transferred directly to the up / down (U / D) terminal of the nonvolatile potentiometer unit 30, and the Schmitt trigger negative logic gate of the nonvolatile potentiometer controller 20 is applied. (N2, N3) is operated to provide a control signal that must be input for the Xcor CM9 chip of Xicor, which is used as the nonvolatile potentiometer Ch1, to operate.

The Schmitt trigger negative AND gate N3 acts as an unstable multivibrator when the switch 10 is pressed to provide a control signal for the nonvolatile potentiometer Ch1 to move the wiper to the sliding contacts for adjustment, and the Schmitt A capacitor C3 is connected to one input terminal of the trigger negative logic gate N3 and a resistor R6 is connected to an input terminal and an output terminal of the Schmitt trigger negative logic product N3 to provide a period to the unstable multivibration. do.

In addition, the output signal of the Schmitt trigger negative AND gate N3 is input to the increment (/ INC) stage of the nonvolatile potentiometer Ch1, and the wiper when the signal transitions from a logic level high to a logic level low Moves.

The circuit consisting of the diodes D1 and D2, the resistors R3 and R4, and the capacitors C1 and C2 is output from the Schmitt trigger negative AND gate N2 to select the chip select terminal of the nonvolatile potentiometer Ch1 (/). CS) and a comparison prediction between a signal input to the increment (/ INC) terminal of the nonvolatile potentiometer Ch1 output from another Schmitt trigger negative AND gate (N3).

When the switch up or down button is pressed by the above process, the up / down (U / D) signal, the chip select (/ CS) signal, and the increment (/ INC) signal are inputted to the nonvolatile potentiometer Ch1. When the nonvolatile potentiometer Ch1 is operated, the wiper is adjusted between the adjustment slide contacts to change the resistance value, and when the switch is opened, the changed resistance value is stored.

When the nonvolatile potentiometer Ch1 operates, the luminance or brightness of the liquid crystal display 40 is controlled through the op amp I1 that provides the liquid crystal display 40 with a bias voltage varying from 0V to -256V. Provide an output signal.

However, the brightness and brightness control device of a liquid crystal display using a conventional nonvolatile potentiometer inputs a user's command using a mechanical switch, and thus, a lighter and smaller notebook personal computer or a pen personal computer It is difficult to work on.

Therefore, an object of the present invention is to solve the disadvantages of the prior art, and to adjust the resistance value of the nonvolatile potentiometer without using a mechanical switch, and to provide a nonvolatile potentiometer that can easily adjust the brightness or brightness of the liquid crystal display device. An object of the present invention is to provide a brightness and brightness control device for a liquid crystal display device.

The potentiometer control unit includes an input unit for instructing a user to adjust brightness or brightness desired by the user, a system for operating the entire apparatus according to a signal of the input unit, and a decoder for generating a control signal of an operation corresponding to the command of the system. And a nonvolatile potentiometer control unit for compensating the time from switch on to switch off, a nonvolatile potentiometer unit which receives a control signal of the nonvolatile potentiometer control unit, adjusts and resists a resistance value, and outputs the nonvolatile potentiometer unit. It consists of a liquid crystal display element whose brightness and brightness are controlled by the signal.

Another aspect of the present invention is to achieve the above object, a brightness control unit connected to the system through a decoder, a pulse generator for outputting a signal fed back to reset the input signal, and the brightness control in the same structure as the brightness control unit It consists of a luminance control unit used to adjust the and a pulse generator for outputting a signal fed back to reset the input signal.

When described with reference to the accompanying drawings the most preferred embodiment which can easily implement this invention by the above configuration as follows.

2 is a block diagram illustrating a configuration of an apparatus for adjusting brightness and brightness of a liquid crystal display device using a nonvolatile potentiometer according to an exemplary embodiment of the present invention.

As shown in FIG. 2, the configuration of the brightness and brightness control device of the liquid crystal display device using the nonvolatile potentiometer according to the embodiment of the present invention, in the case of a pen personal computer, uses an icon (ICON), which is a conventional input device. Hotkeys to set the brightness and brightness to be adjusted, to communicate the icons through the digitizer controller to the integrated input, up and down control signals of brightness and brightness, and to enter the desired action on a notebook personal computer. An input unit 110 for inputting a control signal for increasing or decreasing the brightness and the brightness level as described above using a hot-key or a utility program, and the brightness level or the brightness level at the input unit 110. According to the signal to be adjusted up or down, the code corresponding to the above signal is written to the corresponding input / output port to A system 120 for outputting a code corresponding to an address and an up or down signal for adjusting the degree of brightness or brightness, and an address indicating an input / output port output from the system 120 (XA (9) to XA (0). )) And data indicating code (SD (1), SD (0)) are input to determine whether it is luminance or brightness to be controlled as an input / output port, and the determined luminance chip selection signal CON_CS or brightness is determined. A decoder for providing the chip select signal BRI_CS to the nonvolatile potentiometer controller and providing the brightness up / down signal CON_U / D or brightness up / down signal BRI_U / D to the nonvolatile potentiometer according to the determination ( 130 and the luminance chip selection signal CON_NS or the brightness chip selection signal BRI_CS which are output from the decoder 130, and are operated to receive the luminance increment CON_NS or the brightness increment as a nonvolatile potentiometer. Cross (BRI_INC) and the comparison edge A nonvolatile potentiometer controller 140 which provides a predetermined brightness chip selection signal CONCS and a brightness chip selection signal BRICS and provides a save signal for resetting the latched chip selection signals CON_CS and BRI_CS to the decoder. ), The control signals CONCS, CON_INC, BRICS, and BRI_INC output from the nonvolatile potentiometer controller 140 and the control signals CON_U / D and BRI_U / D output from the decoder 130 are operated. The non-volatile potentiometer unit 150 shifts the position of the wiper between the slide contacts for adjustment and stores it, and the liquid crystal display device 160 whose brightness and brightness are controlled by the output signal of the non-volatile potentiometer unit 150. Is made of.

The operation of the brightness and brightness control device of the liquid crystal display device using the nonvolatile potentiometer according to the embodiment of the present invention by the above configuration is as follows.

The icon, which is an input device of the pen personal computer described in the above configuration, is a menu board for selecting a desired operation using a digitizer pen. Here, a menu for adjusting luminance and brightness can be set, and when selected, the digitizer can be selected. Control signals are transmitted to the system 120 to increase or decrease the brightness and the degree of brightness through the controller.

Unlike in the case of the pen personal computer, a model such as a notebook personal computer without an icon uses a hot-key or a utility program designed to be used by a user. A control signal is sent to the system 120 to up or down the degree of.

Accordingly, the input unit 10 becomes an icon of a digitizer in the case of the pen personal computer, and a keyboard may be used in a personal computer without the device.

When such an input signal is transmitted to the system 120 along a path, the system 120 instructs to change and store the resistance value of the nonvolatile potentiometer by writing a specific value to a predetermined input / output port.

For example, 1) Fn + u (one of the hotkeys may be used) may be used to increase the brightness of the input unit 110 and the system 120 when a keyboard hotkey is used. Set to a user-definable key.

2) Press Fn + u to transfer the code value promised by the keyboard controller to the BIOS.

3) Write to the input / output port specified by bias (ex: 260 _h , 1 → brightness up).

4) The decoder 130 decrypts the above example statement. The control signal CON_CS output from the decoder 130 controls the nonvolatile potentiometer control unit 140 to change the resistance value, store the value, and generate an output signal to generate the output signal. Increase the luminance level.

The decoder 130 determines whether it is luminance or brightness to adjust the octal address (XA (9) to XA (0)) representing the input / output port in the system 120 to determine the luminance chip selection signal CON_CS or the brightness chip. The selection signal BRI_CS is provided to the nonvolatile potentiometer controller 140.

Providing data (SD (0), SD (1)) indicating a code input to the input / output port and an up / down signal (CON_U / D) of brightness or brightness determined by the determination to the nonvolatile potentiometer unit 150. To identify whether to increase or decrease the brightness or brightness.

The determination process in the decoder 130 is as follows.

* Brightness Control = (Input / Output Port) 261 _h , (SD) 0

BRI_U / D = SD 0; SD 0 is the brightness down code, SD 1 is the brightness up code

BRI_CS = SD 1; When any one of 0 and 1 is input to the input / output port

* Luminance control = (input / output port) 260 _h , (SD) 0

CON_U / D = SD 0; SD 0 → luminance town, SD 1 → luminance up

CON_CS = SD 1; If any 0,1 Either input to the input port 260 _h

Each of the two signals is a signal output from the decoder 130 to the nonvolatile potentiometer 150 and the nonvolatile potentiometer controller 140, and is input to the up / down end (U / D) of the nonvolatile potentiometer Ch1. The signals BRI_U / D and CON_U / D cause the nonvolatile potentiometer Ch1 to operate differently at two logical levels, but the signals BRI_CS and CON_CS provided to the nonvolatile potentiometer controller 140 are logical levels. The nonvolatile potentiometer controller 140 is driven so that a necessary control signal for operating the nonvolatile potentiometer Ch1 can be provided by the nonvolatile potentiometer controller 140 only in a low high state.

The nonvolatile potentiometer Ch1 which starts operation by receiving the control signals CONCS, CON_IN, BRICS, and BRI_INC output from the nonvolatile potentiometer controller 140 is a control signal CON_U / D provided from the decoder 130. According to BRI_U / D), the position is moved between the slide contacts for adjustment to increase or decrease the brightness or the brightness, change the resistance value, store it, _and output it through the wiper voltage terminal (V _W ).

The output signal is input to the liquid crystal display device 160 via an op amp so as to be changed in a voltage range suitable for adjusting the brightness and brightness of the liquid crystal display device.

4 is a circuit diagram of a nonvolatile potentiometer controller in a brightness and brightness controller of a liquid crystal display device using a nonvolatile potentiometer according to an embodiment of the present invention.

As shown in FIG. 4, the configuration of the brightness and brightness control apparatus of the nonvolatile potentiometer controller 140 in the liquid crystal display device using the nonvolatile potentiometer according to the embodiment of the present invention is connected to an input terminal of the signal BRI_CS. The other contact of the parallel connection of the diode D11 and the resistor R13, which is forward, is connected to one input terminal, and the power supply V _CC is input to the other input terminal. Schmitt-triggered negative AND gate (N2) for outputting; and a capacitor (C11) inserted into the portion connected to the ground at the contact connected to the input terminal of one side of the Schmitt-triggered AND gate (N12), and the input terminal The other contact of the parallel connection of the diode (D2) and the resistor (R4) of the reverse direction and one side is connected to one input terminal, and is connected through the capacitor (C13 ', C13'') connected in parallel with the ground, A Schmitt trigger negative AND gate N13 having the other input terminal and outputting the brightness increment signal BRI_INC, and a resistor connecting the output terminal of the Schmitt trigger negative AND gate N13 and its other input terminal ( R15), a brightness controller 142 consisting of a condenser C12 connecting the contact to ground, and a monostable multivibrator driven by the brightness increment BRI_INC signal of the controller 142, and using an output signal. The brightness pulse generator 144 feeding the BRI_SAVE back to the decoder and the brightness controller 142 have the same structure as the brightness controller 142, and the luminance controller differs from the input signal CON_CS and the output signals CONCS and CON_INC that only enter the input terminal. 146 and a luminance pulse generator 148 that is driven by the output signal CON_INC of the luminance control unit 146 and also feeds back the output signal CON_SAVE to the decoder.

The operation of the nonvolatile potentiometer controller 140 in the brightness and brightness controller of the liquid crystal display device using the nonvolatile potentiometer according to the embodiment of the present invention by the above configuration is as follows.

3 shows input and output signals of a decoder in a brightness and brightness controller of a liquid crystal display device using a nonvolatile potentiometer according to an embodiment of the present invention.

As shown in FIG. 3, the decoder 130 determines a signal input by the user through the input unit 110 and performs a luminance chip selection signal CON_CS and a luminance up / down signal CON_U / D for a corresponding operation. ) Or a brightness chip select signal BRI_CS and a brightness up / down signal BRI_U / D.

According to the signal output from the decoder 130, among the components of the nonvolatile potentiometer controller 140, the luminance controller 146, the luminance pulse generator 148, or the brightness controller 142 and the brightness pulse generator 144 operate. Then, the corresponding save signal is supplied among the save signals CON_SAVE and BRI_SAVE for resetting the latched chip select signals CON_CS and BRI_CS to the decoder 130.

The following is a connection of programmable array logic to reset latched chip select signals.

BRI_U / D.ACLK = 26X _h * / XA3 * / XA2 / XA1 * XA0 * / IOW

BRI_CS.ACLK = 26X _h * / XA3 * / XA2 / XA1 * XA0 * / IOW

BRI_CS.RSET = BRI_SAVE

CON_U / D.ACLK = 26X _h * / XA3 * / XA2 / XA1 * XA0 * / IOW

CON_CS.ACLK = 26X _h * / XA3 * / XA2 / XA1 * XA0 * / IOW

CON_CS.RSET = BRI_SAVE

In this connection, BRI_CS.ALCK and CON_CS.ACLK are clock signals that synchronize the previous control signals (BRI_CS, BRI_U / D, CON_CS, CON_U / D) to occur, and BRI_CS.RSET and CON_CS.RSET are the previous chips. This is a signal for resetting the selection signals BRI_CS and CON_CS.

The connection type indicates that the logical level of the address (XA (9) to XA (0)) designating the input / output port is 261 _h , 260 _h in hexadecimal and the input / output signal is inputted. U / D, CON_U / D) and the chip select signal (BRI_CS, CON_U / D) are provided to enable the clock to generate them.

The save signals BRI_SAVE and CON_SAVE are output from the brightness pulse generator 148 or the brightness pulse generator 144 of the nonvolatile potentiometer controller 140.

In the case of using a conventional mechanical switch, the user operates by pressing and releasing the switch button, which means that the releasing operation stops the adjustment of the brightness or the degree of brightness.

The pulse generators 144 and 148 use a monostable multivibrator in which the interval of pulses is adjusted. The resistance of the nonvolatile potentiometer at the moment in a conventional circuit when the user releases the switch, that is, when the switch is opened. Compensate the action of resisting value.

In the process of generating the output signal shown in FIG. 3 by receiving an input / output port indicating the luminance or brightness and a code indicating the up / down (CON_U / D, BRI_U / D) output from the system 120 By resetting the latched chip select signals CON_CS and BRI_CS, the user command may be received from the system 120 at the current time.

As described above, in the embodiment of the present invention, the liquid crystal using the nonvolatile potentiometer having the effect of easily adjusting the brightness or brightness of the liquid crystal display device by adjusting the resistance of the nonvolatile potentiometer without using a mechanical switch. It is possible to provide a device for adjusting brightness and brightness of a display device.

Claims (8)

An input unit for commanding a brightness or brightness desired by the user, a system for operating the entire apparatus according to the signal of the input unit, a decoder for generating a control signal of an operation corresponding to the command of the system, and switch-on to switch-off Non-volatile potentiometer control unit that compensates for time, a non-volatile potentiometer unit for receiving the control signal of the non-volatile potentiometer control unit to adjust and store the resistance value and the liquid crystal that brightness and brightness is controlled by the signal output from the non-volatile potentiometer unit Liquid crystal display device brightness and brightness control device using a nonvolatile potentiometer, characterized in that consisting of a display element. 2. The liquid crystal display device according to claim 1, wherein the input unit does not install a switch or a new device, but additionally sets brightness or brightness in the existing input device. Brightness Control. The brightness and brightness control device of a liquid crystal display device using a nonvolatile potentiometer according to claim 1, wherein each of the input and output ports is set to adjust brightness and brightness in the system. The apparatus of claim 1, wherein the nonvolatile potentiometer unit includes a plurality of potentiometers for adjusting luminance and brightness, respectively. The apparatus of claim 1, wherein the nonvolatile potentiometer controller includes a brightness controller connected to the system through a decoder, a brightness pulse generator for outputting a signal fed back to reset the input signal, and the same structure as the brightness controller. And a luminance control unit for adjusting the luminance and a luminance pulse generator for outputting a signal fed back to reset the input signal. 6. The brightness and brightness control device of a liquid crystal display device using a nonvolatile potentiometer control unit according to claim 5, wherein the brightness pulse generator and the brightness pulse generator use a monostable multivibrator. 6. The brightness and brightness control device of a liquid crystal display device using a nonvolatile potentiometer according to claim 5, wherein the brightness control unit and the brightness pulse generator have the same circuit configuration as the brightness control unit and the brightness pulse generator. The non-volatile potentiometer according to claim 5, wherein the suit of the brightness controller and the brightness pulse generator and the suit of the brightness controller and the brightness pulse generator are individually driven by respective input signals input from the decoder. Luminance and brightness controller of liquid crystal display device.