CN100353406C - Flat panel display device structure - Google Patents

Abstract

The invention discloses a flat panel display device structure, which comprises a plurality of pixels and an adjusting unit, wherein the pixels also comprise a thin film transistor and a light-emitting component, the thin film transistor is connected with the light-emitting component in series, the adjusting unit is connected with one end of the thin film transistor in a signal mode, and the adjusting unit enables a signal conversion curve of the pixels to perform a vertical translation adjusting action to adjust the brightness of the pixels. The adjusting unit can be adjusted by a resistance voltage division mode or a direct current voltage conversion circuit, and the adjusting unit receives the level of an external voltage signal to realize the vertical translation adjusting action of the signal conversion curve, so that the requirement of the current on the adjusting amplitude of the signal conversion curve can be met.

Description

Flat panel display device structure

technical field

The present invention relates to a structure of a flat display device, in particular to a structure of a flat display device, which includes an adjustment unit for adjusting the pixel brightness of the structure of the flat display device.

Background technique

In recent years, flat-panel displays such as flat-screen TVs, mobile phones, personal digital assistants, digital cameras, car displays, and projectors have been widely used by the general public.

Please refer to FIG. 1 , which is a known structure of a flat panel display device, including a thin film transistor 11 , a light emitting element 12 and an adjustment unit 13 . The output end of the adjustment unit 13 is signal-connected to a gate 111 of the TFT 11 , and a drain 112 of the TFT 11 is signal-connected to one end of the light-emitting element 12 . The user can change the output signal 132 through a signal conversion curve by changing the input signal 131 of the adjustment unit 13, and the thin film transistor 11 can adjust the threshold between the gate 111 and the drain 112 according to the input signal of the gate 111 The voltage value determines the current input into the light-emitting component 12 through the drain 112 . The luminous brightness of the light-emitting component 12 increases as the current input to the light-emitting component 12 increases.

Please also refer to FIG. 2, which is a known signal conversion curve coordinate diagram, wherein the horizontal axis of the signal conversion curve coordinate diagram represents the aforementioned input signal 131, which can be a digital signal, and the vertical axis represents Like the aforementioned output signal 132, it can be an analog voltage output. The signal conversion curve 21 is similar to the gamma curve, which presents the corresponding relationship between the input signal 131 and the output signal 132 . The user can output the corresponding output signal 132 by inputting the input signal 131 of the above-mentioned adjustment unit 13 .

Please refer to Fig. 3, it is a kind of known adjusting unit, comprises at least two adjustable resistors 31, 32 and a series resistor group 33, wherein the series resistor group 33 can be formed by a plurality of resistors connected in series, and can be connected at the resistor connection A plurality of voltage points 34 are divided, and one end of the adjustable resistor 31 is connected to input a highest input voltage 35 and a highest voltage point 36 is divided. One end of the other adjustable resistor 32 is connected to a minimum input voltage 37 and a minimum voltage point 38 is obtained. Therefore, the voltage value of the highest voltage point 36 is the highest voltage value that the adjustment unit can output, the voltage value of the lowest voltage point 38 is the lowest voltage value that the adjustment unit can output, and the voltage values of the multiple voltage points 34 are between The adjustment unit can output between the highest voltage value and the lowest voltage value. A known adjusting unit has quadratic voltage points (for example, N), and according to a digital signal input by a user, the adjusting unit outputs the voltage value of the Nth voltage point as an output. The corresponding relationship between the input digital signal and the output analog signal can draw the signal conversion curve coordinate diagram shown in Figure 2. The user can adjust the voltage values of the multiple voltage points 34 by adjusting the resistance values of the adjustable resistors 31 and 32 .

Please also refer to FIG. 4, which is a signal conversion curve coordinate diagram for adjusting the signal conversion curve according to the adjustment unit in FIG. 3, wherein the horizontal axis of the signal conversion curve coordinate diagram represents an input signal 41, and the vertical axis represents an output signal 42 , and the signal conversion curve 43 presents the corresponding relationship between the input signal 41 and the output signal 42 . When the resistance value of the adjustable resistor 33 is adjusted to be small, the left half of the signal conversion curve 43 will move toward the direction A, and when the resistance value of the adjustable resistor 33 is increased, the left half of the signal conversion curve 43 will move toward B direction to move. When the resistance value of the adjustable resistor 34 is adjusted to be small, the right half of the signal conversion curve 43 will move toward the C direction, and when the resistance value of the adjustable resistor 34 is increased, the right half of the signal conversion curve 43 will move toward the D direction move. Therefore, by adjusting the resistance values of the adjustable resistors 33 and 34 , the curvature and line shape of the signal conversion curve 43 can be changed, that is, the corresponding relationship between the input signal 41 and the output signal 42 can be changed. When the signal output of the adjustment unit is connected to a thin film transistor, the signal conversion curve 43 can be adjusted according to the characteristics of the thin film transistor, so that a light emitting component corresponding to the thin film transistor can obtain a desired current value to exhibit desired light emitting brightness.

Although the above-mentioned adjustment unit can adjust the signal conversion curve, when the variable resistor is used for adjustment, the range that can change the signal conversion curve is limited. In the process of actually manufacturing flat-panel display devices, due to the drift effect, the threshold voltage values between the gate and drain of the thin-film transistors of each flat-panel display device are different, so even if the same signal is input to the gate of the thin-film transistor Depending on the pole, the current output to the light-emitting component is also different, so that the luminous brightness of the light-emitting component will not be as expected. Since the difference in the threshold voltage value is determined by the environmental conditions during actual production, sometimes the error may exceed 1 volt, so that the range of the signal conversion curve that can be adjusted by the existing adjustment unit cannot correct such a large error, which causes the brightness of the display device to be inferior. Due to the expected situation, the quality of the flat panel display device cannot be further improved.

In view of the above situation, the present invention provides a structure of a flat panel display device, which includes an adjustment unit, which can make a large vertical translation adjustment of the signal conversion curve, so as to solve the problem of insufficient adjustment range of the signal conversion curve of the existing known adjustment unit. The present invention also proposes a structure of a flat panel display device including an adjustment unit to solve the above problems.

Contents of the invention

The present invention provides a flat display device structure, which includes a plurality of pixels and an adjustment unit, wherein the pixel further includes a thin film transistor and a light-emitting component, and the thin-film transistor is connected in series with the light-emitting component, and the signal of the adjustment unit is connected to one end of the thin-film transistor and the The adjustment unit makes a signal conversion curve of the pixel perform a vertical translation adjustment action to adjust the brightness of the pixel. The adjustment unit can use a resistance voltage divider or a DC voltage conversion circuit to adjust the level of an external voltage signal received by the adjustment unit, so as to realize the vertical translation adjustment of the signal conversion curve.

In summary, the structure of the flat panel display device provided by the present invention can meet the current requirements for the adjustment range of the signal conversion curve, so that the quality of the flat panel display device is greatly improved.

In order to further understand the technical features and realized effects of the present invention, preferred embodiments will be described below with reference to the accompanying drawings.

Description of drawings

Fig. 1 is a known flat display device structure;

Fig. 2 is a known coordinate diagram of a signal conversion curve;

Fig. 3 is a known adjusting unit;

FIG. 4 is a signal conversion curve coordinate diagram for adjusting the signal conversion curve according to the adjustment unit in FIG. 3;

5 is a schematic structural view of a flat display device according to the present invention;

Fig. 6 is a schematic diagram of an adjustment unit according to the present invention;

Figure 7 is a schematic diagram of another adjustment unit according to the present invention; and

FIG. 8 is a coordinate diagram of a signal conversion curve adjusted by an adjustment unit according to the present invention.

Description of reference symbols

11: Thin film transistor;

111: gate;

112: drain;

12: Light-emitting components;

13: Adjustment unit;

131: input signal;

132: output signal;

31: adjustable resistance;

32: adjustable resistance;

33: series resistance group;

34: voltage point;

35: Maximum input voltage;

36: the highest voltage point; 37: the lowest input voltage;

38: lowest voltage point;

41: input signal;

42: output signal;

43: Signal conversion curve;

51: pixel;

511: thin film transistor;

5111: drain;

5112: gate;

512: light-emitting component;

52: adjustment unit;

521: input signal;

522: output signal;

61: series resistance group;

62: Voltage divider module;

621: resistance;

622: adjustable resistance;

63: voltage point;

64: external voltage signal;

65: minimum output voltage;

66: Minimum voltage point;

67: maximum output voltage;

68: the highest voltage point;

71: DC voltage conversion circuit; 81: input signal;

82: output signal;

83: Signal conversion curve;

84: Move up the signal conversion curve;

85: move down the signal conversion curve; and

A, B, C, D: directions.

Detailed ways

Please refer to FIG. 5 , which is a structural diagram of a flat panel display device according to the present invention, including a pixel 51 and an adjustment unit 52 , wherein the pixel 51 also includes a thin film transistor 511 and a light emitting component 512 and the drain of the thin film transistor 511 The electrode 5111 is connected in series with the light-emitting element 512 , and the output terminal of the adjustment unit 13 is connected to a gate 5112 of the thin film transistor 511 for signal. The user can change the output signal 522 through a signal conversion curve of the pixel 51 by changing the input signal 521 of the adjustment unit 52, and the thin film transistor 511 is connected between the gate 5112 and the drain 5111 according to the input signal of the gate 5112 The threshold voltage value determines the current input into the light-emitting component 512 through the drain 5111 . The luminance of the light-emitting component 512 , that is, the brightness of the pixel 51 , can be determined by the magnitude of the current input into the light-emitting component 512 . The adjustment unit 52 can also perform a vertical translation adjustment action on a signal conversion curve of the pixel 51 to adjust the brightness of the pixel 51, and generally the adjustment unit 52 can also be directly included in a driver chip, or included in a digital Analog circuits inside the chip. If the light-emitting component 512 is an organic light-emitting diode, the flat-panel display device is called an organic electroluminescence display device.

Please also refer to FIG. 6, which is a schematic diagram of an adjustment unit according to the present invention, which at least includes a series resistance group 61 and a voltage dividing module 62, wherein the series resistance group 61 is formed by a plurality of resistors connected in series, and connected to the resistance A plurality of voltage points 63 can be separated out. The voltage divider module 62 can be a circuit composed of a resistor 621 and an adjustable resistor 622, wherein one end of the resistor 621 can accept an external voltage signal 64, and one end of the adjustable resistor 622 can be grounded. By adjusting the adjustable resistor 622 A resistance voltage divider method generated by the resistance value of the external voltage signal 64 is used to adjust a level of the external voltage signal 64 to output a minimum output voltage 65 to one end of the series resistance group 61 and divide a minimum voltage point 66, and a maximum output voltage 67 It can be equal to the minimum output voltage 65 plus a preset voltage or equal to the minimum voltage value 65 multiplied by a preset multiple, and the maximum output voltage 67 is output to one end of the series resistor group 61 and divided into a highest voltage point 68 . Therefore, the voltage value of the highest voltage point 68 is the highest voltage value that the adjustment unit can output, the voltage value of the lowest voltage point 66 is the lowest voltage value that the adjustment unit can output, and the voltage values of the multiple voltage points 63 are between Between the highest voltage value and the lowest voltage value that the adjustment unit can output, by adjusting the resistance value of the adjustable resistor 622, the minimum output voltage 65 can be changed, that is, the highest voltage point 68, the lowest voltage point 66 and multiple voltages can be adjusted The voltage value of the point 63, and the voltage value of the voltage point can be increased or decreased at the same time, so that a corresponding signal conversion curve is adjusted by a vertical translation.

Please also refer to FIG. 7, which is a schematic diagram of another adjustment unit according to the present invention, which at least includes a series resistance group 61 and a DC voltage conversion circuit 71, wherein the DC voltage conversion circuit can accept an external voltage signal 64 and adjust A level of the external voltage signal 64 is high or low to output a minimum output voltage 65 to one end of the series resistor group 61. As mentioned above, by adjusting the minimum output voltage 65, the highest voltage point 68 and the lowest voltage point can be adjusted. 66 and the voltage values of a plurality of voltage points 63, and the voltage values of the voltage points can be increased or decreased at the same time, so that a corresponding signal conversion curve can be adjusted by a vertical translation.

Please refer to FIG. 8 , which is a signal conversion curve coordinate diagram of the signal conversion curve adjusted by the adjustment unit according to the present invention, wherein the horizontal axis of the signal conversion curve coordinate diagram represents an input signal 81 , and the vertical axis represents an output signal 82 , and the signal conversion curve 83 is a gamma curve, representing the corresponding relationship between the input signal 81 and the output signal 82 . When the adjustment unit receives an external voltage signal and adjusts its level to increase, that is, when the output voltage increases at the same time, the signal conversion curve 83 will move vertically upwards to form an upward shift signal conversion curve 84; when the adjustment unit receives an The external voltage signal is adjusted so that its level becomes smaller, that is, the output voltage becomes smaller at the same time, and the signal conversion curve 83 will move vertically downward to form a downward shift signal conversion curve 85 . From the above, the adjustment unit of the present invention can greatly adjust the signal conversion curve to improve the known technology that can only fine-tune the signal conversion curve, which can meet the current requirements for the adjustment range of the signal conversion curve, so that the flat-panel display device The quality has been greatly improved.

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 various changes and modifications without departing from the spirit and scope of the present invention. Therefore The protection scope of the present invention shall be determined by the claims of the present invention.

Claims (11)

1. plane displaying device structure comprises:

A plurality of pixels, each pixel have a thin film transistor (TFT) and a luminescence component, and this thin film transistor (TFT) is this luminescence component of serial connection; And

Adjustment unit, signal connect the gate terminal of this thin film transistor (TFT), and this adjustment unit makes a signal transformation curve of this pixel carry out a vertical translation adjustment to move the brightness of adjusting this pixel.

2. plane displaying device structure as claimed in claim 1, wherein this luminescence component is an Organic Light Emitting Diode.

3. plane displaying device structure as claimed in claim 1, wherein this adjustment unit is contained in the chip for driving.

4. plane displaying device structure as claimed in claim 1, wherein this adjustment unit is contained in the digital-to-analog circuit chip.

5. plane displaying device structure as claimed in claim 1, wherein an end of this thin film transistor (TFT) is a gate terminal.

6. plane displaying device structure as claimed in claim 1, wherein this signal transformation curve is an an ancient woman's ornament Maqu line.

7. plane displaying device structure as claimed in claim 1, wherein this vertical translation is a upwards translation.

8. plane displaying device structure as claimed in claim 1, wherein this vertical translation is a downward translation.

9. plane displaying device structure as claimed in claim 1, wherein this vertical translation is just controlled by a level of an external voltage signal.

10. plane displaying device structure as claimed in claim 9, wherein this external voltage signal is adjusted this level height by an electric resistance partial pressure mode.

11. plane displaying device structure as claimed in claim 9, wherein this external voltage signal is adjusted this level height by a direct current voltage conversion circuit.

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