JP2004327178A - Display panel leak current balancer - Google Patents

Abstract

A leak current balance device for a display panel is provided.
The display panel module (20) includes an inverter (30) and a display panel module (20), and removes or neutralizes a residue remaining between a light tube (3, 4) and an external metal cover structure (1). In a leak current balance device for a display panel to be operated or balanced, the leak current balance device (2) is directly connected to an external metal cover structure (1) of a display panel module (20) to convert a waveform signal to an external metal. It is characterized by directly injecting into the cover structure (1) to remove or neutralize the remaining on the display panel or to equilibrate.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for equalizing leakage current of a display panel, and more particularly, to a device capable of removing or neutralizing or equilibrating a charge remaining between a light tube and an external metal cover structure of a display panel module. .
[0002]
[Prior art]
In general, in the case of a liquid crystal display, a display device usually has a backlight projection light source and is composed of a plurality of lamps. As shown in FIG. 1, R _s1 / R _s2 is a line resistance. (Not equal to each other), C ₁ and C ₂ are regarded as the main equivalent doping capacitors of the lamp tube, and are not equal to each other, and may vary depending on manufacturing factors, mechanical positions, or conductor arrangements. In this case, C ₁ and C ₂ become unbalanced. Among them, R _x1 and R _x2 are series resistance of a dope equivalent capacitor, and since a high frequency and high voltage power supply inverter is usually employed for a backlight lamp, an equivalent circuit of the dope parasitic effect becomes complicated and the average distribution is increased. And it becomes difficult to maintain balance.
As a result, the lamp currents flowing through L ₁ and L ₂ are not the same or average and become unbalanced due to the unbalance of the parasitic elements, and thus unbalance or unbalance in terms of the overall brightness of the panel and gray scale. A uniform phenomenon occurs, which not only affects the display quality of the display, but also has a certain influence on human visual health. However, no solution to this problem has been provided so far.
[0003]
[Problems to be solved by the invention]
A main object of the present invention is to solve the above-mentioned drawbacks of the prior art and to eliminate the drawbacks. In other words, the present invention utilizes a kind of waveform signal generating device, and has a structure in which the leakage remaining in a display panel is reduced. It removes or neutralizes the leakage charge with respect to the current.
[0004]
In order to achieve the above object, the apparatus operated by the present invention is directly connected to the external metal cover structure of the display panel module or the resin material of the intermediate layer or connected via a bridging element to directly output the external signal. It is injected into an intermediate layer resin material having a metal cover structure to eliminate or neutralize the charge remaining on the display panel, or to equilibrate it.
[0005]
[Means for Solving the Problems]
The invention according to claim 1 includes an inverter (30) and a display panel module (20), and removes a residue remaining between the light tubes (3, 4) of the display panel module (20) and the external metal cover structure (1). Alternatively, in a display panel leak current balancing device for neutralizing or equilibrating, the leak current balancing device (2) is directly connected to the external metal cover structure (1) of the display panel module (20) to generate a waveform signal. Is directly injected into the outer metal cover structure (1) to remove, neutralize, or equilibrate the remaining in the display panel.
According to a second aspect of the present invention, in the leak current balancer for a display panel according to the first aspect, the leak current balancer (2) is a waveform signal generator, and the waveform signal generator is a signal calculation function circuit (21). ), The equivalent frequency of the waveform generation circuit (22), the output resistance of the waveform signal generation circuit (23), and the passive element (24) for injecting the balanced signal, and the passive element is composed of capacitors, inductors, transformers, and batteries. A leakage current balance device for a display panel characterized by being composed of any one type.
According to a third aspect of the present invention, in the leak current balancer for a display panel according to the first aspect, the leak current balancer (2) is of an active type and injects a waveform signal in a fixed mode with a fixed frequency and a fixed width. Alternatively, a complex composite function waveform having multiple phases, multiple frequencies, and multiple wave widths is injected, and the active leak current balancer (2) is composed of a bridge element (5) and a neutralization signal waveform generator circuit (6). And a leak current balance device for a display panel.
According to a fourth aspect of the present invention, in the leak current balancing device for a display panel according to the third aspect, the active type leak current balancing device (2) includes a bridge element (5), a waveform synthesis module (7), and a waveform analysis module ( A leakage current balance device for a display panel, characterized in that it is composed in 8).
According to a fifth aspect of the present invention, in the leak current balance device for a display panel according to the first aspect, the leak current balance device (2) is directly connected to the intermediate layer resin material (40) of the display panel module (20). A feature is a leak current balance device for a display panel.
According to a sixth aspect of the present invention, in the leak current balancer for a display panel according to the first aspect, the leak current balancer (2) is directly connected between the display panel module (20) and the inverter (30), and is a time division type. Alternatively, the electric charge remaining on the display panel is removed or neutralized or made in a balanced state by a phase division method, and the above-described leak current balance device (2) is provided with the first switch (17) and the second switch (18), and A bridge element (5) connected to a second switch (18) and a neutralization signal waveform generator circuit (6) are formed, and the first switch (17) and the second switch (18) are MOS transistors of a high voltage switching element. Or a leakage current balance device for a display panel, characterized by being composed of any one of active devices and passive devices. .
According to a seventh aspect of the present invention, there is provided a display panel leakage current balancing device according to the first aspect, wherein the inverter (30) is a transformer.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a view showing an equivalent connection between a display of the present invention and a backlight module. As shown in the figure, the display panel leakage current balance device of the present invention effectively neutralizes the leakage current and leakage charge generated by the parasitic capacitor between the display and the backlight module, and reduces the unbalance phenomenon of the leakage current. Due to the exclusion, the current flowing through each lamp tube maintains the consistency of the lamp light sources and averages the luminance over a wide range of the panel.
[0007]
According to the present invention, the external metal cover structure (1) of the display panel module (20) or the intermediate layer resin material (40) is provided with the leak current balance device (2) (waveform signal generation device). It is a current / leak charge balance generator, a signal calculation function circuit (21), an equivalent (rms square root) frequency (22) of a waveform generation circuit, an output resistance (23) of a waveform signal generation circuit, and a balanced signal injection passive element (24). ) (In the form of capacitors, transformers, batteries or direct injection).
[0008]
S _i than _{i c1 + i c2 + i c} +. _{. . . . .} Is obtained and the output of the driving inverter (transformer) (30) for lighting is a high voltage (several hundred volts) at a public fraction of 10 KHz. ₀ ) and (23), and since this voltage has a different phase difference and signal difference between each of the currents i _c1 and i _c2 , the signal after the waveform synthesis is a lamp (3). , 4) and may have a wave width error on the wave width, and the sum (difference) between the phase difference and the original signal theoretically indicates the low frequency parasitic or leak current signal value. Can occur.
[0009]
The signal obtained from the S _i is sent to the addition signal computing function circuit (21). This circuit receives the control voltage generator, starting potential is the 0V, when this, S _i is the input of an unbalanced signal, the circuit is boosted to constant, the voltage which has received the control further waveform signal generator (Leak current balancer (2)). This waveform signal generation device is a variable frequency generator controlled by voltage. When 0 V is input, it is input as a very low frequency signal. When the input control voltage continuously increases, the output frequency of the waveform signal generation device sequentially increases. When the signal frequency, the previous phase difference, and the low frequency value of the input lighting frequency difference match, the _Si signal passes _VAC through the output resistor (23) and the balanced signal injection passive element (24) to the external metal. The leakage charge of the leakage current reaching the cover structure (1) causes neutralization, and the _Si signal approaches zero (or becomes minimum).
[0010]
Since S _BAL is the sum of the phase aliquot of balanced signal is injected into the outer metal cover structure (1) can be decomposed into a phase aliquot of _{i c1} and _{i c2,} the leakage current of each _{i c1} and _{i c2,} the leakage charge removal Alternatively can neutralize, when reaching the frequency of the output balanced signals that signal S _i, to achieve the lowest value, the signal calculation function circuit when the (21) in the lowest S _i, the output control voltage is fixed and for which, V _AC signal generator; output (waveform signal generator leakage current balancing device (2)) tracks the termination certain reference frequency, maintaining the S _i at the lowest point, the entire Sokuchi capacitor C ₁ + C ₂ + C + _{. . . . . .} Is maintained in the state of equilibrium neutralization.
[0011]
The leak current and the leak charge of the parasitic doping elements such as the capacitors C ₁ and C ₂ are canceled by the present apparatus, so that the current of the lamp tubes (3, 4) does not interfere and the current of the lamp tubes (3, 4) is averaged. And maintain equilibrium, thereby obtaining uniform brightness and gray scale results on the entire display surface, solving the problems of the prior art and significant quality disadvantages.
[0012]
FIG. 2 shows a passive embodiment of the present invention, and FIG. 3 shows another passive embodiment of the present invention. As shown, this embodiment is almost the same as the previous embodiment, except that the bridging element (5) is connected to the external metal cover structure (1) or the intermediate layer resin material (40). When this bridging element (5) is composed of a capacitor, an inductor and a transformer, and is connected to the capacitor, it is affected by the capacitor capacity and the plus and minus ends, and the LOW ESR (equivalent series resistance) is optimized.
[0013]
4 and 5 show a first active embodiment of the present invention and an actual circuit diagram. As shown, this embodiment is substantially the same as the previous embodiment, except that a neutralizing signal waveform generator circuit (6) is connected to the bridging element (5) to increase the gain. And a large current is supplied, and a fixed mode waveform signal is injected (the waveform signal is injected into the outer metal cover structure (1) or the intermediate layer resin material (40)), and this signal has a fixed frequency and a wave width. However, it is also possible to use a complex composite function waveform of multi-phase, multi-frequency, and multi-wavelength, and removes a leak current and a leak charge of a parasitic doping element such as the capacitors C ₁ and C ₂ .
[0014]
6, 7, and 8 are a second type active embodiment of the present invention, an actual block diagram and an operation flow display diagram. As shown, this embodiment is almost the same as the above embodiment, except that the waveform synthesizing module (7) and the waveform analyzer between the bridging element (5) and the outer metal cover structure (1). That is, the module (8) is connected.
[0015]
At start-up, the above two modules send out the scanning frequency (generated from the DAC), the ADC reads the signal value 10, then determines and searches for the lowest point of the read value 11; Returning to the step, if the lowest point, the signal waveform is maintained 12, the waveform data is sent to the DAC 13, and the signal waveform is sent 14. Alternatively, it is determined whether the read value floats, and if it does not float, the process returns to the signal waveform maintenance, and if it floats, the output signal waveform is corrected and then returns to the signal waveform maintenance.
[0016]
FIG. 9 is a view showing a front injection type embodiment of the present invention. As shown, in this embodiment, a first switch (17) and a second switch (18) are directly connected between the front end of the display panel module (20) and the inverter (30), and the second switch (18) is connected. ) Are sequentially connected to the bridging element (5) and the neutralization signal waveform generator circuit (6), and the first switch (17) and the second switch (18) are connected to a high voltage switching element MOS or other active element. , Or a passive element, that is, a time-division type (or a phase-division type) is used to eliminate or neutralize the charge remaining in the display panel module (20) or to equilibrate it.
[0017]
The above is a description of preferred embodiments of the present invention, and does not limit the scope of the present invention, and any modification or alteration of details that can be made based on the present invention shall fall within the scope of the claims of the present invention. I do.
[0018]
【The invention's effect】
The display panel leakage current balancing device of the present invention solves the drawbacks of the prior art and includes an inverter (30) and a display panel module (20), and a light tube (3, 4) of the display panel module (20). And a leak current balance device for a display panel which removes, neutralizes, or equilibrates a residue between the outer metal cover structure and the external metal cover structure. In connection with the external metal cover structure (1), the waveform signal is directly injected into the external metal cover structure (1) to remove or neutralize the residual on the display panel or to equilibrate.
[Brief description of the drawings]
FIG. 1 is an equivalent connection display diagram between a display of the present invention and a backlight module.
FIG. 2 is a schematic diagram showing a passive embodiment of the present invention.
FIG. 3 is a schematic view showing another passive embodiment of the present invention.
FIG. 4 is a schematic view showing a first type of active embodiment of the present invention;
FIG. 5 is an actual circuit diagram of FIG. 4;
FIG. 6 is a schematic diagram showing a second type of active embodiment of the present invention.
FIG. 7 is an actual circuit block diagram of FIG. 6;
FIG. 8 is an operation flowchart of FIG. 6;
FIG. 9 is a schematic view showing a front injection type embodiment of the present invention.
[Explanation of symbols]
(1) External metal cover structure (2) Leakage current balancer (3, 4) Light tube (5) Bridge element (6) Neutralized signal waveform generator circuit (7) Waveform synthesis module (8) Waveform analysis module (17) 1) First switch (18) Second switch (20) Display panel module (21) Signal calculation function circuit (22) Equivalent frequency of waveform generation circuit (23) Output resistance of waveform signal generation circuit (24) Balanced signal injection passive Element (30) Inverter (40) Intermediate layer resin material

Claims (7)

Equipped with an inverter (30) and a display panel module (20) to remove or neutralize or balance the residue between the light tubes (3, 4) and the outer metal cover structure (1) of the display panel module (20). In the display panel leak current balancing device to be put into a state, the leak current balancing device (2) is directly connected to the external metal cover structure (1) of the display panel module (20) to convert the waveform signal into the external metal cover structure (1). 3.) A device for leak current balancing of a display panel, wherein the device is directly injected into the device to remove, neutralize or equilibrate residuals in the display panel. 2. A leak current balancing device for a display panel according to claim 1, wherein said leak current balancing device is a waveform signal generating device, and said waveform signal generating device is a signal calculation function circuit, a waveform generating circuit, or the like. Value frequency (22), output resistance of waveform signal generation circuit (23), and balanced signal injection passive element (24), and this passive element is composed of any one of capacitor, inductor, transformer, and battery. A leak current balancing device for a display panel. 2. The leak current balancing device for a display panel according to claim 1, wherein said leak current balancing device is of an active type and injects a waveform signal of a fixed mode having a fixed frequency and a fixed width, or a multi-phase or multi-frequency signal. Injecting a complex composite waveform having a multi-wavelength width, the active type leak current balancer (2) is composed of a bridge element (5) and a neutralization signal waveform generator circuit (6). Display panel leak current balancer. 4. The leak current balancing device for a display panel according to claim 3, wherein the active type leak current balancing device is composed of a bridging element, a waveform synthesizing module and a waveform analyzing module. A leak current balance device for a display panel, characterized in that: 2. The leak current balance device for a display panel according to claim 1, wherein the leak current balance device is directly connected to the intermediate layer resin material of the display panel module. Leakage current balancer. The leak current balancing device for a display panel according to claim 1, wherein the leak current balancing device (2) is directly connected between the display panel module (20) and the inverter (30), and is a time division type or a phase division type. The charge remaining in the panel is removed or neutralized or equilibrated, and the aforementioned leak current balancer (2) is connected to the first switch (17), the second switch (18), and the second switch (18). The first switch (17) and the second switch (18) are composed of a bridge element (5) and a neutralization signal waveform generator circuit (6) connected together, and the first switch (17) and the second switch (18) are MOS or other active elements of a high voltage switching element. A leak current balance device for a display panel, comprising a passive element. 2. The leak current balancing device for a display panel according to claim 1, wherein the inverter is a transformer.

Images