CN1121627C - LCD panel signal processor - Google Patents

Abstract

The liquid crystal display panel signal processor comprises an input interface for receiving various image signals; the micro-processing device outputs a first control signal to control the input interface to select a first image signal from the image signals, converts the first image signal into a digital image signal with an output format, and simultaneously sends out a notification signal to notify the panel controller of the output format, and the panel controller receives the digital image signal according to the output format and generates a gate driver signal and a source driver signal to output to the gate driver and the source driver.

Description

LCD panel signal processor

technical field

The invention relates to a signal processor, in particular to a liquid crystal display panel signal processor.

Background technique

As shown in FIG. 1, U.S. Patent No. 5,856,818 relates to a conventional liquid crystal display panel structure, including a graphics controller 1 for generating control signals (Vsync, Hsync, DE, MCLK) and data signals (DATA EVEN, DATA ODD), an interface device 2, controls the gate driver 3 and the upper and lower source drivers 4, 5 according to the control signal and data signal of the graphics controller 1, and the liquid crystal display panel (LCD) 6 uses the gate driver 3 and the upper and lower source drivers The drives 4, 5 operate.

However, since the aforementioned graphics controller 1 and interface device 2 belong to the LCD module part and the LCD panel part, the two must match each other.

In addition, in the design of the image signal input interface, generally only one type of image signal can be specified, and multiple image signals cannot be input at the same time. For example, US Patent No. 5,987,543 discloses a traditional notebook computer In order to overcome the EMI problem caused by high-speed data transmission, it has developed a standard low-dropout signal (LVDS: standard LoW Voltage Differential Signaling) for input interface circuits (interface circuits), and uses peripheral slots A single image signal is received, and the peripheral slot is sequentially coupled to the video input port (video port), LVDS transmitter, LVDS receiver, and display device in series. In addition, another similar known method is to adopt TMDS technology (transition minimized differential signaling: minimize low-dropout signal conversion).

In addition, U.S. Patent No. 5,959,601 discloses the use of a display engine to receive image data and use it to determine whether to display it on a CRT display or an LCD display. If it is used for a CRT display, the image data is sent to a digital/analog converter , to convert image data into analog signals representing pixel data such as red, blue, green, etc. If used in LCD displays, the image data is sent to the LCD engine.

In addition, U.S. Patent No. 6,025,817 discloses an allocation of signal pins (allocation of signal pins) standard, such as selecting a 15-pin D-sub connector, in a display data channel 1, 2 system, 15 pins correspond to Respective signal (connector for standard VGA video output).

The aforementioned conventional technology discloses that the display device can use the interface circuit to receive digital image data or analog image data, but does not disclose a method for integrating different interface circuits to select the desired image data after receiving various image data.

Furthermore, there is still room for improvement in the power management design of the traditional liquid crystal display panel structure. The resistance of the resistor divides the voltage to determine the different driving power sources. Therefore, it cannot be dynamically adjusted according to the DC power supply voltage required by each internal device at any time, and the performance cannot be optimized.

Contents of the invention

In view of this, the present invention is to solve the foregoing problems, and it provides a liquid crystal display panel signal processor (LCD panel signal processor), which is suitable for a liquid crystal display panel with a gate driver and a source driver, including an input interface, receiving a variety of Image signal; a micro-processing device that outputs a first control signal to control the input interface to select a first image signal from the aforementioned image signals, and converts the first image signal into a digital image signal with an output format, and simultaneously sends out A notification signal informs a panel controller of the output format, and the panel controller receives digital image signals according to the output format, and generates gate driver signals and source driver signals to output to the gate driver and the source driver.

In addition, the signal processor of the liquid crystal display panel also includes a power distributor for generating at least one DC power supply, wherein the power distributor is coupled to the pulse width modulation signal generating device of the micro-processing device, so that the pulse width modulation The signal controls the voltage value of the DC power supply.

Description of drawings

The present invention will be described below in conjunction with the drawings and preferred embodiments.

Figure 1 shows the structure of a traditional liquid crystal display panel.

FIG. 2 is a circuit block diagram of a signal processor of a liquid crystal display panel in an embodiment of the present invention.

FIG. 3 is a detailed circuit block diagram of an input interface in an embodiment of the present invention.

FIG. 4 is a circuit block diagram of a power distributor in an embodiment of the present invention.

FIG. 5 is a circuit block diagram of a panel controller in an embodiment of the present invention.

FIG. 6 is a detailed circuit block diagram of a power distributor in an embodiment of the present invention.

Detailed ways

Input interface 12; video signals V1, V2, V3; microprocessing device 14; first control signal C1; output format OF; notification signal N1; panel controller 16; gate driver signals GRS1, GRS2; source driver signals SRS1, SRS2; Gate driver 22; source driver 24; liquid crystal display panel signal processor 10; test pattern generation device 162; test pattern storage device 162a; test pattern P; test pattern extraction/conversion device 162b; selection device 164; second control signal C2 ; pulse width modulation signal generator 142; pulse width modulation signal PWM; power distributor 18; DC power supply DC1, DC2, DC3; voltage control device 182; alternating voltage AC; ; Composition of Zener diode 184a.

A liquid crystal display panel signal processor of the present invention will be described below using FIG. 2 . The components with the same reference number represent components with the same function.

Referring to FIG. 2, the liquid crystal display panel signal processor 10 is suitable for a liquid crystal display panel 20 having a gate driver 22 and a source driver 24, which includes the following components.

Referring first to Fig. 2 and Fig. 3, the input interface 12 is integrated with a plurality of interfaces to receive multiple video signals. Here, three video signals are taken as an example, such as the analog video signal V1, which can be one from a TV channel selector (TV tunnel box) image signal (AV: audio-Visual signal), which can be transmitted to the image decoder 122 through the AV connector 121, and when the image decoder 122 is enabled, the image signal can be decoded to produce a corresponding image The digital video signal of the output format (output format) of the signal; The digital video signal V2 can be a low dropout signal from the LVDS/TMDS transmitter of the VGA device, and this low dropout signal can be sent to the LVDS through the LVDS/TMDS connector 123 The /TMDS receiver 124, when the LVDS/TMDS receiver 124 is enabled, can receive the low dropout signal and generate a digital image signal with an output format corresponding to the low dropout signal; and another analog signal V3, It can be a 15-pin D-sub connector 125, which transmits signals corresponding to 15 pins for standard VGA image output, such as red, blue, green and other pixel data R, G, B and horizontal synchronization and The vertical synchronizing signal HSY/VSY is sent to the analog/digital converter ADC126. When the analog/digital converter ADC126 is enabled, the aforementioned analog signal is converted into a digital image signal having an output format corresponding to the analog signal.

The micro-processing device MCU14 is used to output a first control signal C1 to control the input interface 12 to select an image signal from a variety of image signals, such as using the first control signal C1 to enable the image decoder 122, LVDS/TMDS One of the receiver 124 and the analog/digital converter ADC126 is used to make it act. For example, in the case of enabling the analog/digital converter ADC126, the analog image signal V3 is converted into an output format (output format) Digital video signal (digital video signal) OFDV, such as a digital video signal including even data EVEN-DATA, odd data ODD-DATA, and synchronous signal SYNC.

Wherein, the microprocessing device MCU14 will send a notification signal N1 at the same time to notify the panel controller 16 of the output format OF corresponding to the video signal V3, and the panel controller 16 receives the digital image according to the output format OF after receiving the notification signal N1. signal OFDV, and thus generates a gate driver signal GRS1 and a source driver signal SRS1 to the gate driver 22 and the source driver 24 .

In addition, referring to FIG. 5 , the panel controller 16 also includes a selection device 164 and a test pattern generation device 162 , where the following components can be used to test whether the liquid crystal display panel is normally displayed.

As shown in the figure, the test pattern generation device 162 includes a test pattern storage device 162a, such as being composed of a memory, which is used to store a plurality of test patterns P; and a test pattern extraction/conversion device 162b, which is used to retrieve One of the plurality of test patterns from the test pattern storage device 162a is fetched, and the fetched test pattern is converted into a gate driver signal GRS2 and a source driver signal SRS2.

Wherein the panel controller 16 also includes a selection device 164, and the microprocessing device MCU14 outputs a second control signal C2 to control the selection of the aforementioned selection device 164, such as selecting the output of the panel controller 16 as an image signal from the input interface 12 The converted gate driver signal GRS1 and source driver signal SRS1, or the converted gate driver signal GRS2 and source driver signal SRS2 from the test pattern P of the test pattern storage 162a.

In addition, the microprocessing device can update the test pattern stored in the test pattern storage device 162a at any time through the IIC (Industry Interchip communication) transmission line 166.

Referring to Fig. 2 and Fig. 4 simultaneously, in the liquid crystal display panel signal processor of the present embodiment, also have a power distributor 18, and the microprocessing device MCU14 then also has a pulse width modulation signal generating device PG142, and it is used for Generate a pulse width modulation signal PWM.

Wherein the power distributor 18 is used to generate at least one DC power supply DC1, DC2, DC3, wherein the power distributor 18 is coupled to the pulse width modulation signal generating device 142 of the microprocessing device 14, so as to be modulated by the pulse width The signal PWM controls the voltage values of the DC power supplies DC1-DC3.

In addition, the DC power supplies DC1 - DC3 are also fed back to the micro-processing device 14 to change the pulse width (W) of the pulse width modulation signal PWM according to the voltage value of the DC power supply. In this way, the pulse width modulation signal generator 142 can control the voltage values of the DC power sources DC1 - DC3 with the pulse width W of the pulse width modulation signal PWM.

In addition, the detailed embodiment of the power distributor 18 is shown in FIG. 4 , which has a voltage control device 182 and a DC power generation device 184 . Wherein, the voltage control device 182 outputs at least one AC voltage such as AC1-AC3 according to the power supply voltage such as 3.3/5V, wherein the voltage control device 182 is coupled to the pulse width modulation signal generating device 142 of the micro-processing device 14, so that the The pulse width modulation signal PWM is used to adjust the voltage value of the AC voltage AC1-AC3.

The DC power generation device 184 converts the AC voltages AC1 - AC3 to generate DC power sources DC1 - DC3 with voltage values corresponding to the AC voltages AC1 - AC3 .

Also refer to FIG. 6 , which further shows the internal components of the voltage control device 182 and the DC power generating device 184 . The voltage control device 182 has at least one transistor 182b and an inductor 182a. One end of the inductor 182a receives the power supply voltage 3.3/5V, and the other end is coupled to the transistor 182b to generate an AC voltage AC1-AC3, wherein the pulse width modulation signal PWM is controlled by the (base) switch of the transistor 182b (switching ) to adjust the voltage value of AC voltage AC1 ~ AC3. The DC power generating device 184 is composed of at least one Zener diode 184a, which is generally coupled to the grounding capacitor Cn. The AC voltages AC1-AC3 generate corresponding DC power DC1-DC3 through the Zener diode 184a to provide to the grid respectively. The driver 22 , the source driver 24 , and the panel controller 16 are fed back to the micro-processing device MCU14 .

As shown in FIG. 6, one end of the inductor 182a receives the power supply voltage, and the other end is coupled to the collector terminal of the transistor 182b. The emitter terminal of the transistor 182b is grounded, and the base terminal is coupled to the pulse width modulation signal generating device 142, so that the pulse width The modulation signal PWM controls the switching of the transistor 182b.

In addition, in the above-mentioned embodiment, the signal processor 10 of the liquid crystal display panel can be integrated using an integrated circuit IC, such as the micro-processing device 14 and the power distributor 18 can be designed using an integrated circuit with the IC number SM51C48D1, and the input interface 12 and the panel The controller 16 can be designed using an integrated circuit with the IC number Smu32X01.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection should be defined by the scope of the claims.

Claims (12)

1. a signal processing unit with LCD panel is applicable to that one has the display panels of gate driver and Source drive, comprising:

One inputting interface receives multiple signal of video signal;

One micro treatmenting device, export one first control signal and in this multiple signal of video signal, select one first kind of signal of video signal to control this inputting interface, and to change this first kind of signal of video signal be one to have the digital image signal of output format, sends a notification signal simultaneously to notify this output format; And

One panel controller receives this notification signal to receive this digital image signal according to this output format, produces one first group of gate driver signal and Source drive signal and gives this gate driver and Source drive.

2. signal processing unit with LCD panel as claimed in claim 1, wherein this panel controller also comprises a test pattern generation device, this test pattern generation device comprises:

One test pattern memory storage is in order to store a plurality of test patterns; And

One test pattern acquisition/conversion equipment, from one of a plurality of test patterns of this test pattern memory storage, and the test pattern of changing this acquisition is second group of gate driver signal and Source drive signal in order to acquisition.

3. signal processing unit with LCD panel as claimed in claim 2, wherein this panel controller also comprises a selecting arrangement, in order to selecting this panel controller to be output as, this first group of gate driver signal and Source drive signal or this second group of gate driver signal and Source drive signal one group.

4. signal processing unit with LCD panel as claimed in claim 3, wherein this micro treatmenting device also comprises output one second control signal, to control the selection of this selecting arrangement to the output of this panel controller.

5. signal processing unit with LCD panel as claimed in claim 4, wherein the test pattern of this test pattern memory device stores is to be upgraded by this micro treatmenting device.

6. signal processing unit with LCD panel as claimed in claim 1, wherein this micro treatmenting device also comprises a pulse-width modulating signal generator, in order to produce a pulse width modulation signal.

7. signal processing unit with LCD panel as claimed in claim 6, it more comprises an electric power source distribution device, in order to produce at least more than one direct supply, wherein this electric power source distribution device is coupled to the pulse-width modulating signal generator of this micro treatmenting device, with the magnitude of voltage by this this direct supply of pulse width modulation signal controlling.

8. signal processing unit with LCD panel as claimed in claim 7, wherein this direct supply is also fed back to this micro treatmenting device, changes the pulse width of this pulse width modulation signal with the magnitude of voltage according to this direct supply.

9. signal processing unit with LCD panel as claimed in claim 8, wherein this pulse-width modulating signal generator is to control the magnitude of voltage of this direct supply with the pulse width of this pulse width modulation signal.

10. signal processing unit with LCD panel as claimed in claim 7, wherein this electric power source distribution device comprises:

One voltage-operated device, in order to export an alternating voltage according to a supply voltage, wherein, this voltage-operated device is coupled to the pulse-width modulating signal generator of this micro treatmenting device, to be adjusted the magnitude of voltage of this alternating voltage by this pulse width modulation signal; And

One direct current power supply generator is changed this alternating voltage to produce at least more than one the direct supply to magnitude of voltage that should alternating voltage.

11. signal processing unit with LCD panel as claimed in claim 10, wherein this voltage-operated device comprises at least one transistor, an and inductance, the one termination is received this supply voltage, the other end is coupled to this transistor, in order to produce an alternating voltage, wherein this pulse width modulation signal is that mat is controlled this transistorized switch and switched the magnitude of voltage of adjusting this alternating voltage.

12. signal processing unit with LCD panel as claimed in claim 11, wherein this direct supply generation device is made up of at least one Zener diode.

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