CN1901018B - Display and gamma correction voltage generating device thereof - Google Patents

Abstract

A device for generating a gamma correction voltage for a display. The device for generating a gamma correction voltage includes an integrated circuit component and a gamma correction voltage generating circuit. The present invention mainly arranges a part of the gamma correction voltage generating circuit inside the integrated circuit component. Compared with the existing gamma correction voltage generating circuit arranged outside the integrated circuit component, the number of electronic components used can be reduced, thereby saving circuit costs.

Description

Display and its gamma correction voltage generating device

technical field

The invention relates to a device for generating gamma correction voltage, in particular to a device for generating gamma correction voltage in which a gamma correction voltage generating circuit is arranged in a driving integrated circuit assembly of a display. the

Background technique

Since there is a non-linear relationship between the grayscale value of the display screen and the signal voltage, as well as between the grayscale value of the screen and the brightness of the screen, it is necessary to correct the gamma parameter (input a gamma correction voltage), so that the aforementioned nonlinear relationship becomes Into a linear relationship, in order to obtain high-quality images. the

The gamma correction voltage in the existing liquid crystal display can be produced by a gamma correction voltage generating circuit. As shown in FIG. The driver integrated circuit assembly (referred to as driver IC) 1000 of the display panel enables the driver IC 1000 to generate correct gamma voltage and then output it to the liquid crystal panel, so that the screen can display correct brightness. the

The above-mentioned gamma correction voltage generation circuit 10 can be composed of a resistor string 100 as shown in FIG. The gamma correction voltages G1-Gn are sent to the driver IC 1000 to make the driver IC generate correct gamma voltage values. the

However, since the resistance value of the resistor string 20 of the driver IC 1000 may shift during the manufacturing process, a plurality of operational amplifiers (OP) 120 may be connected in parallel between the resistor string 100 and the resistor string 20 to overcome the resistance of the resistor string 20. The problem of resistance value offset, as shown in Figure 3. the

However, since the voltage output of the resistor string 100 is fixed, there is little flexibility in the design. If there are different requirements for the gamma correction voltage, it may not be satisfied. In addition, if the gamma correction voltage needs to be dynamically designed, This type of gamma correction voltage generating circuit cannot cope with it. In addition, the components for generating the gamma correction voltage are all arranged on the circuit board outside the driving IC, which will increase the cost of the circuit. the

Another existing method for generating a gamma correction voltage is shown in FIG. 4, using a timing controller (Timing Controller, referred to as TCON) 40 to drive a programmable digital/analog converter (digital to analog converter, DAC) 50 to generate the gamma correction voltages G1-Gn, which are input into the driving IC 1000 to generate correct gamma voltages. In this way, the components for generating the gamma correction voltages are also arranged on the circuit board outside the driving IC, which will increase the cost of the circuit. the

Contents of the invention

In view of this, the purpose of the present invention is to reduce the cost of gamma voltage correction and increase the flexibility of design, and arrange the gamma voltage correction components inside the driver IC. the

To achieve the above object, the present invention provides a gamma correction voltage generating device, comprising: a plurality of integrated circuit components; and a gamma correction voltage generating circuit, including a first circuit disposed in each integrated circuit component, and A second circuit is arranged outside each integrated circuit component, and the first circuit has at least one input terminal receiving a signal from the second circuit, and at least one output terminal outputting a gamma correction voltage. the

In the gamma correction voltage generating device of the present invention, it also includes a voltage source, which is arranged outside each integrated circuit component and connected to the second circuit, and the voltage source inputs a voltage signal into the first circuit through the input terminal. circuit, and output the gamma correction voltage through the output terminal. the

In the gamma correction voltage generating device of the present invention, the first circuit includes an operational amplifier, the voltage source inputs a voltage signal into the operational amplifier through the input terminal, and outputs the gamma correction voltage through the output terminal. the

In the gamma correction voltage generation device of the present invention, it further includes a bus connected to the above-mentioned input end to input a control signal to the first circuit, and output the gamma correction voltage through the output end. The first circuit can utilize a digital/analog converter, or utilize a pulse width modulation circuit (PulseWidth Modulation, PWM). the

In the gamma correction voltage generating device of the present invention, the bus includes a clock input line for inputting clock signals, and a data input line for simultaneously inputting data signals and control signals. the

In the gamma correction voltage generating device of the present invention, the bus includes a clock input line for inputting clock signals, a data input line for inputting data signals, and a control signal input line for inputting control signals. the

The present invention also provides a display, including: a display panel; a circuit board; a plurality of integrated circuit components arranged on the circuit board and driving the display panel; and a plurality of gamma correction voltage generation circuits, including a first A circuit is provided in each integrated circuit device to generate a plurality of gamma correction voltages, and a second circuit is provided outside each integrated circuit device, and each first circuit has at least one input terminal receiving from the second circuit signal, and at least one output terminal outputs a gamma correction voltage; wherein, each integrated circuit component has a plurality of input terminals receiving gamma correction voltages from all or other integrated circuit components. the

In the display of the present invention, each integrated circuit component has a plurality of input terminals for receiving gamma correction voltages from other integrated circuit components. the

In order to make the above and other objects, features, and advantages of the present invention more comprehensible, a preferred embodiment will be exemplified below and described in detail with reference to the accompanying drawings. the

Description of drawings

FIG. 1 is a block diagram of a conventional gamma correction voltage generation circuit. the

FIG. 2 is a schematic diagram of a conventional gamma correction voltage generation circuit. the

FIG. 3 is a schematic diagram of another conventional gamma correction voltage generation circuit. the

FIG. 4 is a block diagram of another conventional gamma correction voltage generation circuit. the

FIG. 5 is a block diagram of a gamma correction voltage generation circuit according to a first embodiment of the present invention. the

FIG. 6 is a schematic diagram of a gamma correction voltage generation circuit according to a first embodiment of the present invention. the

FIG. 7 is a schematic diagram of the gamma correction voltage distribution method of the present invention. the

FIG. 8 is a block diagram of a gamma correction voltage generating circuit according to a second embodiment of the present invention. the

FIG. 9 is a schematic diagram of a gamma correction voltage generation circuit according to a second embodiment of the present invention. the

FIG. 10 is a schematic diagram of another gamma correction voltage generation circuit in the second embodiment of the present invention. the

Description of reference symbols

10～gamma correction voltage generation circuit; 20～resistor string; 40, 400～timer/counter control register; 50, 500～digital/analog converter; 100～resistor string; 120, 220, 320～operational amplifier; 600 ～PWM circuit; 700～bus; 800～RC circuit; 1000, 2000, 3000～driver IC; C～digital control signal; G1, G2,..., Gn～gamma correction voltage; GS1, GS2,... , GSn ~ gamma source voltage. the

Detailed ways

first embodiment

The first embodiment of the present invention is shown in Fig. 5, Fig. 6, and the resistor string 100 that produces gamma (Gamma) correction voltage is still kept outside the drive IC 1000, but the operational amplifier 220 is arranged on the drive IC 1000, 2000, The interior of 3000... As shown in FIG. 6, the gamma source voltages GS1-GSn are output to the operational amplifier 220 through the resistor string 100, and the gamma correction voltages G1-Gn generated by the operational amplifier 220 are output from the driver IC 1000, and then through the method shown in FIG. 7 They are assigned to other driver ICs 2000, 3000.... For example, the driver IC 1000 outputs G1 and distributes it to other driver ICs 2000, 3000..., and the driver IC 2000 outputs G2 and distributes it to other driver ICs 1000, 3000...etc. However, as shown in FIG. 7, the present invention does not exclude the case where G1 is assigned to the driver IC 1000 itself. After each driver IC outputs the correction voltage to other driver ICs, the correct gamma voltage is output to the liquid crystal panel. the

Second embodiment

In the second embodiment of the present invention, as shown in Fig. 8 and Fig. 9, the DAC 500 that generates the gamma correction voltage is installed in the drive IC 1000, and the TCON 400 inputs digital control to the DAC 500 from the outside of the drive IC 1000 via a bus 700. The signal C enables the DAC 500 to generate a gamma correction voltage output, and then distributes the gamma correction voltages equally to other driving ICs 2000, 3000 . . . in the manner shown in FIG. 7 . the

third embodiment

In addition to using the DAC 500, a pulse width modulation (Pulse Width Modulation, PWM) circuit 600 can be set inside the driver IC 1000 as shown in FIG. A digital control signal C is input, and the signal output from the PWM circuit 600 is outputted through a filter circuit 800 and an operational amplifier 320 to become a gamma correction voltage G1. Then, the gamma correction voltage G1 is distributed to other driving ICs 2000, 3000, . . . in the manner shown in FIG. 7 . the

In this embodiment, the above-mentioned bus 700 can use a data sharing bus (share data bus), and the control signal is input to the driving IC through the signal line for inputting the data signal. In this configuration, the bus includes a clock input line for inputting clock signals, and a data input line for simultaneously inputting data signals and control signals. the

The above-mentioned bus 700 may also have an independent control signal line for inputting the control signal into the driving IC. In this configuration, the bus includes a clock input line for inputting a clock signal, a data input line for inputting a data signal, and a control signal input line for inputting a control signal c. the

Effect of the present invention

In the present invention, the components for generating the gamma correction voltage are arranged in the drive IC, thereby saving the number of components in the external circuit, further reducing the circuit cost, and providing greater flexibility in circuit design. the

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Those skilled in the art can make some changes and modifications without departing from the spirit and scope of the present invention. The protection scope of the invention shall be determined by the claims of the present invention.

Claims (11)

1. the generation device of a gamma correcting voltage comprises:

A plurality of integrated circuit packages; And

One gamma correcting voltage produces circuit, comprise that one first circuit is located in each integrated circuit package, and one second circuit be located at the outside of each integrated circuit package, this first circuit has the signal of at least one input end acceptance from this second circuit, and at least one output terminal output gamma correcting voltage is to described a plurality of integrated circuit packages all or that other are all.

2. the generation device of gamma correcting voltage as claimed in claim 1, wherein also comprise a voltage source, be located at the outside of each integrated circuit package and be connected in this second circuit, this voltage source is imported this first circuit with voltage signal via this input end, and via this output terminal output gamma correcting voltage.

3. the generation device of gamma correcting voltage as claimed in claim 2, wherein this first circuit comprises an operational amplifier, this voltage source is imported this operational amplifier with voltage signal via this input end, and via this output terminal output gamma correcting voltage.

4. the generation device of gamma correcting voltage as claimed in claim 1 wherein also comprises a bus, is connected in above-mentioned input end to this first circuit input controlling signal, and via this output terminal output gamma correcting voltage.

5. the generation device of gamma correcting voltage as claimed in claim 1, wherein this second circuit comprises time schedule controller.

6. the generation device of gamma correcting voltage as claimed in claim 4, wherein this first circuit comprises a digital/analog converter.

7. the generation device of gamma correcting voltage as claimed in claim 4, wherein this first circuit comprises a pulse width modulation circuit.

8. the generation device of gamma correcting voltage as claimed in claim 4, wherein this first circuit comprises a filtering circuit.

9. the generation device of gamma correcting voltage as claimed in claim 4, wherein this bus comprises for the moment the clock incoming line for the input clock signal, and a Data In-Line, for input data signals and controlling signal.

10. the generation device of gamma correcting voltage as claimed in claim 4, wherein this bus comprises that the clock incoming line is for the input clock signal for the moment, a Data In-Line is for the input data signals, and a controlling signal incoming line is for the input controlling signal.

11. a display comprises:

One display panel;

One circuit board;

A plurality of integrated circuit packages are located on this circuit board, and drive this display panel; And

A plurality of gamma correcting voltages produce circuit, it is interior to produce a plurality of gamma correcting voltages to comprise that one first circuit is located at each integrated circuit package, and one second circuit be located at the outside of each integrated circuit package, each first circuit has the signal of at least one input end acceptance from this second circuit, and at least one output terminal output gamma correcting voltage;

Wherein, each integrated circuit package has a plurality of input ends, accepts from the gamma correcting voltage all or integrated circuit package that other are all.

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