TWI413049B - Flat display apparatus, flat display panel and loading adjusting method - Google Patents

Abstract

A flat display panel includes a power supply circuit, a panel loading circuit and a loading adjusting circuit. In this case, the power supply circuit generates a loading source signal which has a panel source signal and a loading compensating signal. The panel loading circuit which is electrically connected with the power supply circuit receives and accords a timing control signal to receive the panel source signal. The loading adjusting circuit which is electrically connected with the power supply circuit receives an adjusting signal and the loading compensating signal respectively, and accords the adjusting signal to adjust the loading compensating signal. A flat display apparatus and a loading adjusting method are also disclosed.

Description

Flat display device, flat display panel and load adjustment method

The present invention relates to a display device, a display panel, and a load adjustment method, and more particularly to a flat display device, a flat display panel, and a load adjustment method.

With the advent of the digital era, the technology of flat display devices, such as liquid crystal display devices, has also grown rapidly and has become one of the indispensable electronic products. Therefore, the technical and functional requirements of the public display devices are becoming higher and higher.

In the case of a flat display device, it mainly comprises a flat display panel and a backlight module. The flat display panel mainly has a thin film transistor substrate, a counter substrate and a liquid crystal layer sandwiched between the two substrates, wherein the opposite substrate is usually a color filter substrate; and the backlight module is used as a backlight. It can be used to evenly distribute light from a light source on the surface of a flat display panel.

In the case of a pixel in a flat display device, when the liquid crystal molecules are rotated or tilted according to different driving power signals, different brightness levels may be generated depending on the angle of rotation.

Referring to FIG. 1 , a conventional flat display panel 1 has a plurality of pixels P, and the flat display panel 1 receives a driving power signal I. The driving power signal has a plurality of sub-power signals I1, I2, . . . Input each pixel P separately, and each pixel P is driven by each sub-power signal The driving of I1, I2, ... Im is used to display the screen on the flat display panel 1.

Generally, the driving power signal I is provided by the power circuit of the flat display panel 1 (not shown), and the power circuit usually uses the step-up or step-down method to provide the driving power signal I, and currently used. The boost or buck structure will have at least one inductor and at least one capacitor. In practice, the inductor is wound with a coil, and the capacitor is a multilayer capacitor that is less expensive than an electrolytic capacitor.

When the power supply circuit receives a power supply from the outside, the driving power signal I is generated by the inductor and the capacitor, which is the load current. However, when the load current flows through the coil of the inductor, the coil generates vibration, and the coil and the coil are rubbed by the vibration to generate sound, and when the load current flows through the capacitor, the body is generated due to the physical structure of the capacitor. Vibration, when these vibration frequencies are the same as the frequency of the load power signal output, there will be a resonance phenomenon and a sound, if the sound is heard by the human ear (for example, the frequency is between 2Hz and 20KHz), then Become a source of noise.

Moreover, the size of the power supply determines the size of the driving power signal I, so the sound will vary according to the display screen; if the resolution of the flat display panel is 640×480, and the driving power signal I is at each fixed frequency, for example, 60 Hz input In the pixel, and the values of the sub-power signals I1, I2, ...Im of the driving power signal I are close, the frequency of the driving power signal I output is 34.7 KHz (as shown in FIG. 2A), and no noise is generated; When the display screen is bright and dark, each of the two sub-power signals is one big and one small, so the frequency of the driving power signal is 17.4KHz (as shown in Figure 2B). This produces noise.

As described above, how to provide a flat display device, a flat display panel, and a load adjustment method capable of solving the above problems is one of the current important issues.

In view of the above problems, an object of the present invention is to provide a flat display device, a flat display panel, and a load adjustment method capable of reducing vibration generated by a coil of an inductor and a capacitor body, thereby reducing noise.

To achieve the above object, a flat display panel according to the present invention comprises a power supply circuit, a panel load circuit and a load adjustment circuit. In the present invention, the power supply circuit generates a load power signal, wherein the load power signal has a panel power signal and a load compensation signal, and the panel load circuit is electrically connected to the power supply circuit, and receives and controls the signal according to a timing control signal. Receiving the panel power signal, the load adjusting circuit is electrically connected to the power supply circuit, and respectively receiving an adjustment signal and a load compensation signal, and the load adjustment circuit adjusts the received load compensation signal according to the adjustment signal.

To achieve the above object, a flat display device according to the present invention has a flat display panel including a power supply circuit, a panel load circuit, and a load adjustment circuit. In the present invention, the power supply circuit generates a load power signal, wherein the load power signal has a panel power signal and a load compensation signal, and the panel load circuit is electrically connected to the power supply circuit, and receives and controls the signal according to a timing control signal. Receiving surface The board power signal, the load adjustment circuit is electrically connected to the power supply circuit, and respectively receives an adjustment signal and a load compensation signal, and the load adjustment circuit adjusts the received load compensation signal according to the adjustment signal.

To achieve the above object, the load adjustment method according to the present invention is applied to a flat display panel. The flat display panel has a power supply circuit, a panel load circuit and a load adjustment circuit. The power supply circuit generates a load power signal, and the load power signal has a panel power signal and a load compensation signal, and the panel load circuit is The power supply circuit is electrically connected to the power supply circuit, and the load adjustment circuit is electrically connected to the power supply circuit. The load adjustment method includes the following steps: at a first time, the panel load circuit receives a timing control signal; at a second time, the panel The load circuit receives the panel power signal according to the timing control signal, and the load adjustment circuit receives an adjustment signal and a load compensation signal respectively; determines whether to start the load adjustment function according to the panel power signal; and adjusts the signal according to the adjustment signal when the load adjustment function is started. The received load compensation signal.

According to the above, a flat display device, a flat display panel, and a load adjustment method according to the present invention add a load adjustment circuit to the flat display panel, and the load adjustment circuit is electrically connected to the power supply circuit and the panel load circuit, respectively. The power supply circuit generates a load power signal having a panel power signal and a load compensation signal, and the load adjustment circuit receives and adjusts the load compensation signal according to the adjustment signal, and compensates the panel power signal by the load compensation signal. Compared with the prior art, the present invention can determine whether to perform the load adjustment method according to the panel power signal in addition to the load adjustment circuit. In this way, not only can the flat display device enter When the load adjustment method and function are performed, the load power signal of the power supply signal through the load compensation signal compensation panel is set to a certain value, and the current variation of the internal components flowing through the power supply circuit is reduced, and the vibration amplitude of other components is lowered, thereby reducing the cause. Noise generated by resonance.

Hereinafter, a flat display device, a flat display panel, and a load adjustment method according to a preferred embodiment of the present invention will be described with reference to the related drawings.

Referring to FIG. 3, the flat display device 2 of the preferred embodiment of the present invention has a flat display panel 21, and the flat display panel 21 includes a power supply circuit 211, a panel load circuit 212, and a load adjustment circuit. 213. In this embodiment, the flat display panel 21 receives a plurality of pixel data (not shown), and each pixel data has a gray scale value, and the sum of all the gray scale values has a critical value X (eg, Figure 4). In addition, the flat display device 2 can be a liquid crystal display device, and the flat display panel 21 can be a liquid crystal display panel.

Referring to FIG. 3 again, in the embodiment, the power supply circuit 211 has a first capacitor C1, a second capacitor C2, and an inductor L. Further, the power supply circuit 211 further has a transistor Q1 and A diode D. The inductor L is electrically connected to the first capacitor C1 and the transistor Q1, respectively, and the diode D is electrically connected to the inductor L, the transistor Q1 and the second capacitor C2 respectively; the transistor Q1 of the embodiment In practice, it can be a field effect transistor (MOSFET), and the first capacitor C1 and the second capacitor C2 are respectively a multilayer capacitor. Power supply circuit 211 A power supply V is received from the outside, and the power supply V is converted to generate a load power signal Io via the first capacitor C1, the inductor L, the transistor Q1, the diode D, and the second capacitor C2, and the load power signal Io is It has a panel power signal Ip and a load compensation signal In.

The panel power signal Ip of the embodiment corresponds to the sum of the gray scale values of the pixel data, that is, the plane display device 2 converts the panel power signal Ip corresponding to the sum of the gray scale values according to the sum of the gray scale values. The panel power signal Ip is used as the driving plane display panel 21 to display the screen. In addition, the load power signal Io is a current in implementation, so the panel power signal Ip and the load compensation signal In are also a current, and the load power signal Io is a certain value, so the panel power signal Ip and the load compensation signal In The phases are mutually inverted.

The panel load circuit 212 of the embodiment is electrically connected to the power supply circuit 211, and receives and receives the panel power signal Ip from the power supply circuit 211 according to a timing control signal S1.

In this embodiment, the load adjustment circuit 213 is electrically connected to the power supply circuit 211 and receives an adjustment signal S2 and a load compensation signal In, respectively. The load adjustment circuit 213 of this embodiment includes a resistor R, a third capacitor C3, and a transistor Q2, wherein the resistor R is connected in parallel with the third capacitor C3, and the transistor Q2 is connected to the resistor R and the The three capacitors C3 are connected in series. Therefore, the load compensation signal In flows through the resistor R and the third capacitor C3 of the load adjustment circuit 213, and the load adjustment circuit 213 receives the adjustment signal S2 through the transistor Q2 to adjust the load compensation signal In according to the adjustment signal S2. . In this embodiment, the transistor Q2 In practice, it is a potent transistor (MOSFET).

In addition, as shown in FIG. 3 and FIG. 5 at the same time, the flat display panel 21 of the present embodiment further includes a controller 214 electrically connected to the panel load circuit 212 and the load adjustment circuit 213, respectively, and the controller 214 The timing control signal S1 is generated at a first time T1, and the adjustment signal S2 is generated at a second time T2, and the controller 214 is configured to have a plurality of high frequency switching signals according to the size of the panel power signal Ip. S2'. In this embodiment, the timing control signal S1 and the adjustment signal S2 respectively have a high level and a low level, where the timing control signal S1 is converted from a low level to a high level, and then converted from a high level. The time to the low level is the first time T1, and the time when the adjustment signal S2 is changed from the high level to the low level, and then the low level is changed to the high level is the second time T2. The controller 214 of this embodiment is implemented as a microprocessor or a microprocessor chip.

Referring to FIG. 3 and FIG. 5 simultaneously, in order to solve the vibration frequency generated by the load power signal Io flowing through the first capacitor C1, the inductor L and the second capacitor C2 of the power supply circuit 211, the resonance frequency is generated. When the sound of the sound causes noise, the flat display panel 21 of the embodiment uses a load adjustment method to reduce noise. The operation is as follows: when the power supply circuit 211 receives the power supply V from the outside to convert the load power signal Io, At the first time T1, the panel load circuit 212 receives the timing control signal S1.

At a second time T2, the flat display device 2 is based on the sum of the grayscale values of the received pixel data, and is converted to correspond to the sum of the grayscale values. The panel power signal Ip, the panel load circuit 212 receives the panel power signal Ip according to the timing control signal S1.

At the same time, the controller 214 determines whether to start the load adjustment function according to whether the sum of the grayscale values corresponding to the panel power signal Ip reaches the critical value X (as shown in FIG. 4). Therefore, when the sum of the gray scale values reaches the critical value X of the adjustment signal S2, that is, the panel power signal Ip reaches the value of generating noise, the controller 214 starts the load adjustment function and outputs correspondingly according to the size of the panel power signal Ip. Adjusting the signal S2, when the load adjustment circuit 213 receives the adjustment signal S2, the transistor Q2 is switched by switching a plurality of high frequency switching signals S2' of the signal S2 to adjust the load compensation signal In, and the load compensation signal The In system compensates the panel power signal Ip such that the load power signal Io is a certain value, that is, the load seen by the power supply circuit 211 approaches the constant current load. When the sum of the gray scale values does not reach the critical value X, the panel power signal Ip does not reach the value of generating noise, so the controller 214 does not start the load adjustment function, and the adjustment signal S2 turns off the transistor Q2, that is, the load compensation signal. In does not compensate for the panel power signal Ip.

Since the flat display panel 21 is added with the load adjustment circuit 213, and the load adjustment circuit 213 is electrically connected to the power supply circuit 211 and the panel load circuit 212, respectively, and receives the adjustment signal S2 and the load compensation signal In, respectively, the load adjustment can be performed by the load. The circuit 213 adjusts the load compensation signal In according to the adjustment signal S2, and has a load adjustment method, and can compensate the panel power signal Ip by the load compensation signal In. In this way, not only the flat display device 2 can have a load adjustment function, but also has load compensation. The load power signal Io of the signal In and the panel power signal Ip is a certain value, so that when the load power signal Io flows through the power supply circuit 211, the current change amount of the inductor L and the first capacitor C1 and the second capacitor C2 is lowered, so The friction between the coils of the inductor L is reduced, and the amplitude of the internal structure vibration of the first capacitor C1 and the second capacitor C2 is reduced, thereby reducing the noise generated by the resonance.

Hereinafter, referring to FIG. 6, a load adjustment method according to a preferred embodiment of the present invention is applied to the flat display panel 21 (shown in FIG. 3) of the flat display device 2 of the above preferred embodiment, and The flat display panel 21 is taken as an example.

Referring to FIG. 3 again, the flat display panel 21 of the present embodiment has a power supply circuit 211, a panel load circuit 212, a load adjustment circuit 213, and a controller 214. The power supply circuit 211 is electrically connected to the panel load circuit 212 and the load adjustment circuit 213, respectively, and generates a load power signal Io, and the load power signal Io has a panel power signal Ip and a load compensation signal In; The 214 system is electrically connected to the panel load circuit 212 and the load adjustment circuit 213, respectively.

Hereinafter, please refer to FIG. 3 to FIG. 6 simultaneously, and the load adjustment method includes steps S01 to S05.

In step S01, at a first time T1, the panel power signal Ip receives a timing control signal S1; in step S02, at a second time T2, the panel power signal Ip receives the panel power signal Ip according to the timing control signal SI, and the load is adjusted. The circuit 213 receives an adjustment signal S2 and a load compensation signal In respectively; in step S03, it is determined according to the panel power signal Ip whether to start negative Load adjustment function.

In this embodiment, when it is determined according to the panel power signal Ip whether to start the load adjustment function step S03, the controller 214 determines whether the sum of the grayscale values reaches the critical value X; when the sum of the grayscale values reaches the critical value The controller 214 activates the load adjustment function and generates a corresponding adjustment signal S2 according to the size of the panel power signal Ip, and the adjustment signal S2 has a plurality of high frequency switching signals.

Then, referring to FIG. 6 again, step S04 is performed. When the load adjustment function is activated, the received load compensation signal In is adjusted according to the adjustment signal S2. The load compensation signal In of this embodiment compensates the panel power signal Ip, so the load power signal Io is a certain value.

In addition, when the sum of the grayscale values does not reach the critical value, the controller 214 does not start the load adjustment function, and proceeds to step S05. When the load adjustment function is not activated, the received load compensation is stopped according to the adjustment signal S2. Signal In.

The steps of the detailed load adjustment method are described in detail in the above preferred embodiments, and thus will not be further described herein.

In summary, the flat display device, the flat display panel, and the load adjustment method according to the present invention add a load adjustment circuit to the flat display panel, and the load adjustment circuit is electrically connected to the power supply circuit and the panel load circuit, respectively. The power supply circuit generates a load power signal having a panel power signal and a load compensation signal, and the load adjustment circuit receives and adjusts the load compensation signal according to the adjustment signal, and compensates the panel power signal by the load compensation signal. Compared with the prior art, the present invention is In addition to increasing the load adjustment circuit, the panel power signal can be used to determine whether to perform the load adjustment method. In this way, not only when the load adjustment method and function of the flat display device are performed, the load power signal of the power supply signal through the load compensation signal compensation panel is set to a certain value, and the load power signal is generated and flows through the power supply circuit simultaneously, and the inductance is The current change amount of the first capacitor and the second capacitor is reduced, so that the friction between the coils of the inductor is reduced, and the amplitude of the internal structure vibration of the first capacitor and the second capacitor is reduced, thereby reducing the noise generated by the resonance.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.

1, 21‧‧‧ flat display panel

2‧‧‧Flat display device

211‧‧‧Power supply circuit

212‧‧‧ Panel load circuit

213‧‧‧Load adjustment circuit

214‧‧‧ Controller

C1‧‧‧First Capacitor

C2‧‧‧second capacitor

C3‧‧‧ third capacitor

D‧‧‧ diode

I‧‧‧Drive power signal

Io‧‧‧load power signal

Ip‧‧‧ panel power signal

In‧‧‧ load compensation signal

I1-Im‧‧‧ sub power signal

L‧‧‧Inductors

P‧‧‧ pixels

Q1, Q2‧‧‧O crystal

R‧‧‧Resistors

S1‧‧‧ Timing Control Signal

S2‧‧‧ adjustment signal

S2’‧‧‧ high frequency switching signal

T1‧‧‧ first time

T2‧‧‧ second time

V‧‧‧ power supply

X‧‧‧ threshold

S01-S05‧‧‧Steps for load adjustment method

1 is a schematic diagram showing a conventional display panel for driving a power signal to a flat display panel to drive a plurality of pixels thereof; FIG. 2A to FIG. 2B are diagrams showing a plurality of sub-power sources of a conventional driving power signal. FIG. 3 is a schematic diagram showing a flat display device having a flat display panel according to a preferred embodiment of the present invention; FIG. 4 is a view showing a waveform of the signal and a frequency of the respective outputs of about 34.7 kHz and 17.4 kHz; FIG. FIG. 5 is a diagram showing the relationship between the threshold value, the adjustment signal, and the grayscale value of the flat display panel of the preferred embodiment; FIG. 5 is a diagram showing the negative of the flat display panel according to the preferred embodiment of the present invention. A schematic diagram of waveforms of a power supply signal, a panel power signal, a load compensation signal, an adjustment signal, and a timing control signal; and FIG. 6 is a flow chart showing a load adjustment method in accordance with a preferred embodiment of the present invention.

2‧‧‧Flat display device

21‧‧‧Flat display panel

211‧‧‧Power supply circuit

212‧‧‧ Panel load circuit

213‧‧‧Load adjustment circuit

214‧‧‧ Controller

C1‧‧‧First Capacitor

C2‧‧‧second capacitor

C3‧‧‧ third capacitor

D‧‧‧ diode

Io‧‧‧load power signal

Ip‧‧‧ panel power signal

In‧‧‧ load compensation signal

L‧‧‧Inductors

Q1, Q2‧‧‧O crystal

R‧‧‧Resistors

S1‧‧‧ Timing Control Signal

S2‧‧‧ adjustment signal

V‧‧‧ power supply

Claims (32)

A flat display panel comprises: a power supply circuit for generating a load power signal, wherein the load power signal has a panel power signal and a load compensation signal mutually inverted; a panel load circuit is connected to the power supply The circuit is electrically connected, and receives and controls the panel power signal according to a timing control signal; and a load adjustment circuit is electrically connected to the power supply circuit, and receives an adjustment signal and the load compensation signal respectively, the load The adjustment circuit is based on the adjustment signal to adjust the received load compensation signal. The flat display panel of claim 1, wherein the power supply circuit receives a power source and has a first capacitor, a second capacitor and an inductor electrically connected to each other, and the power supply circuit is The load power signal is generated by conversion according to the first capacitor, the second capacitor, and the inductor. The flat display panel of claim 1, wherein the load adjustment circuit comprises: a resistor; a third capacitor connected in parallel with the resistor; and a transistor coupled to the resistor and The third capacitors are connected in series with each other and receive the adjustment signal. The flat display panel according to claim 3, wherein the The electro-crystal system is a field effect transistor (MOSFET). The flat display panel of claim 1, wherein the panel power signal is a current. The flat display panel of claim 1, wherein the load compensation signal is a current. The flat display panel of claim 1, wherein the load power signal is a certain value. The flat display panel of claim 1, further comprising a controller, wherein the controller generates the timing control signal at a first time, and generates the adjustment signal at a second time. The flat display panel of claim 8, wherein the controller is a microprocessor or a microprocessor chip. A flat display device has a flat display panel, the flat display panel includes: a power supply circuit for generating a load power signal, wherein the load power signal has a panel power signal and a load compensation a signal loading circuit is electrically connected to the power supply circuit, and receives and controls the panel power signal according to a timing control signal; and a load adjustment circuit is electrically connected to the power supply circuit, and respectively Receiving an adjustment signal and the load compensation signal, the load adjustment circuit is configured to adjust the received load compensation signal according to the adjustment signal. The flat display device of claim 10, wherein the power supply circuit receives a power source and has a first capacitor, a second capacitor and an inductor electrically connected to each other, the power supply circuit The load power signal is generated by conversion according to the first capacitor, the second capacitor, and the inductor. The flat display device of claim 10, wherein the load adjustment circuit comprises: a resistor; a third capacitor connected in parallel with the resistor; and a transistor coupled to the resistor and The third capacitors are connected in series with each other and receive the adjustment signal. The flat display device of claim 12, wherein the electro-crystal system is a field effect transistor (MOSFET). The flat display device of claim 10, wherein the panel power signal is a current. The flat display device of claim 10, wherein the load compensation signal is a current. The flat display device according to claim 10, wherein the load power signal is a certain value. The flat display device of claim 10, wherein the flat display panel further comprises a controller, wherein the controller generates the timing control signal at a first time, and generates the adjustment signal at a second time. The flat display device according to claim 17, wherein The controller is a microprocessor or a microprocessor chip. A load adjustment method is applied to a flat display panel, wherein the flat display panel has a power supply circuit, a panel load circuit and a load adjustment circuit, and the power supply circuit generates a load power signal, and the load power source The signal system has a panel power signal and a load compensation signal. The panel load circuit is electrically connected to the power supply circuit. The load adjustment circuit is electrically connected to the power supply circuit. The load adjustment method includes the following steps: In a first time, the panel load circuit receives a timing control signal; and at a second time, the panel load circuit receives the panel power signal according to the timing control signal, and the load adjustment circuit receives an adjustment signal respectively. And the load compensation signal; determining whether to start the load adjustment function according to the panel power signal; and when the load adjustment function is started, adjusting the received load compensation signal according to the adjustment signal. The load adjustment method according to claim 19, further comprising the step of: when the load adjustment function is not activated, stopping the adjustment of the received load compensation signal according to the adjustment signal. The load adjustment method according to claim 20 is applied to a flat display device having the flat display panel. The load adjustment method of claim 20, wherein the power supply circuit receives a power source and has a first capacitor, a second capacitor and an inductor electrically connected to each other, the power supply circuit The load power signal is generated by conversion according to the first capacitor, the second capacitor, and the inductor. The load adjustment method according to claim 20, wherein the flat display panel receives a plurality of pixel data, each of the pixel data has a gray scale value, and the panel power signal corresponds to a gray scale value. sum. The load adjustment method of claim 23, wherein the sum of the gray scale values has a critical value. The load adjustment method according to claim 24, wherein the step of determining whether to start the load adjustment function according to the power signal of the panel further comprises determining whether the sum of the grayscale values reaches the critical value. The load adjustment method of claim 25, wherein the load adjustment function is started when the sum of the gray scale values reaches the threshold. The load adjustment method according to claim 25, wherein when the sum of the gray scale values does not reach the threshold, the load adjustment function is not activated. The load adjustment method of claim 19, wherein the panel power signal is a current. The load adjustment method described in claim 19, wherein The load compensation signal is a current. The load adjustment method of claim 19, wherein the panel power signal and the load compensation signal are mutually inverted. The load adjustment method of claim 20, wherein the flat display panel further comprises a controller, wherein the controller generates the timing control signal at the first time, and generates the adjustment signal at the second time. The load adjustment method according to claim 31, wherein the controller determines whether to start the load adjustment function according to the panel power signal.