TWI413075B - Display and gamma correction circuit thereof - Google Patents

Abstract

A display and a gamma correction circuit thereof are provided. The gamma correction circuit which is suitable for disposing on a printed wire board includes a plurality of the first voltage divider units. The first voltage divider units are connected in series between a first reference voltage and a second reference voltage. Each of the first voltage divider units includes a first reference resistance and a first impedance adjustment device electrically connected to the first reference resistance. The first impedance adjustment device is used for adjusting an equivalent impedance of the first voltage divider units. At least one first impedance adjustment device is a first adjustment resistance, and the other first impedance adjustment devices are first conducting lines respectively.

Description

Display and its gamma adjustment circuit

This invention relates to a display, and more particularly to a gamma adjustment circuit for a display.

With the evolution of optoelectronics and semiconductor technology, the display has been booming. Among many displays, liquid crystal displays (LCDs) have recently been widely used, and replaced cathode ray tube displays (CRTs) as one of the mainstream of next-generation displays.

The driving method of the liquid crystal display is to control the rotation angle of the liquid crystal by changing the voltage across the liquid crystal layer, thereby changing the polarization direction of the light. Both ends of the liquid crystal layer are electrically connected to the pixel voltage and the common voltage. According to the direction of the electric field applied to the liquid crystal layer, the driving method of the liquid crystal display can be classified into a positive polarity driving and a negative polarity driving. When the pixel voltage is higher than the common voltage, it is called positive polarity driving; otherwise, when the pixel voltage is lower than the common voltage, it is called negative polarity driving.

When the same voltage difference is applied to both ends of the liquid crystal layer but different electric field directions are applied, the transmittance of the liquid crystal is not affected. However, if the direction of the electric field applied to the liquid crystal layer is always positive or constant, the liquid crystal quality is deteriorated for a long time and cannot be smoothly rotated in response to the electric field change. This phenomenon is called liquid crystal polarization. In order to avoid the phenomenon of liquid crystal polarization, it is necessary to alternately use voltages of different polarities to drive the liquid crystal at different times, that is, "polarity inverse Turn the way to drive.

FIG. 1A is a partial top view of a conventional liquid crystal display. Referring to FIG. 1A, the liquid crystal display 100 includes a gamma circuit 120, a liquid crystal display panel 130, and a driving component 140. The driving component 140 formed by the source driving circuit 141 and the gate driving circuit 142 is electrically connected to the gamma. Between the circuit 120 and the display panel 130. The liquid crystal display panel 130 includes a plurality of data lines 131a, 131b, ... parallel to each other, a plurality of scanning lines 132, 134, ... which are parallel to each other, and data lines 131a, 131b, ... which are intersected by each other and scanned. The plurality of pixel regions 130a, 130b, ... defined by the lines 132, 134, ..., wherein the data line 131a is electrically connected to the source driving unit 141a in the source driving circuit 141, and the data line 131b is electrically The source driving unit 141b is connected to the source driving circuit 141, and the scanning lines 132, 134, ... are electrically connected to the gate driving circuit 142. Further, the gamma circuit 120 outputs the gamma reference voltage V _GAMi to the source driving circuit 141 to cause the source driving circuit 141 to supply the data voltage required for the liquid crystal display panel 130.

FIG. 1B is a driving waveform diagram of the liquid crystal display panel according to FIG. 1A, wherein V′ _G is a scanning signal provided by the gate driving circuit 142, and V′ _GA and V′ _GB are scanning lines 132 respectively at positions A and B. The transmitted scan signal, V' _D is the data voltage on the data lines 131a, 131b, and V _PA1 and V _PB1 are the pixel voltages in the pixel regions 130a, 130b, respectively.

Referring to FIG. 1A and FIG. 1B simultaneously, in the frame time T ₊ , the liquid crystal display 100 is driven in a positive polarity, and in the next frame time T ₋ , the liquid crystal display 100 is driven in a negative polarity. Wherein the time in the frame time T ₊ is t ₁ and the frame time T _- the time t _2, the gate driving circuit 142 provides scan signals V _'G to the scanning line 132 and the source driver circuit 141 The source driving units 141a, 141b in the middle supply the data voltage V _D to the data lines 131a, 131b, ..., respectively.

Theoretically, the waveform of the scan signal transmitted to the scan line 132 should be V' _G , but in reality, the RC delay will distort the waveform of the scan signal V' _G . It is assumed that the waveform of the scanning signal V' _GA of the pixel region 130a in the vicinity of the gate driving circuit 142 is the same as the waveform of the scanning signal V' _G , and the pixel region 130b at the B farther from the gate driving circuit 142. The waveform has been distorted to a scanning signal V' _{GB which is} quite different from the scanning signal V' _G.

When the time t ₁ and the time t ₂ end, the pixel voltage in the pixel regions 130a, 130b is lower than the data voltage V as the scanning signals V' _GA and V' _GB are switched from the high level to the low level. _D. This phenomenon is called a feed-through effect. The difference between the pixel voltage and the data voltage V _D is called the feed-through voltage. However, the scanning signals V' _GA and V' _{GB at the} two locations A and B are not the same. Therefore, the feedthrough voltage ΔV _{FTA of the} pixel region 130a is naturally not equal to the feedthrough voltage ΔV _{FTB of the} pixel region 130b.

As described above, in the pixel region 130a, the common voltage should be set to the intermediate value V _comA of the pixel voltage V _PA+ and the pixel voltage V _PA- to ensure the display quality of the pixel region 130a at A. However, in the pixel region 130b, the common voltage is set to the intermediate value V _comB of the pixel voltage V _{PB +} and the pixel voltage V _{PB -} to ensure the display quality of the pixel region 130b at the B. From this, it can be seen that regardless of the setting of the common voltage, it is impossible to conform to each of the pixel areas 130a, 130b, ... in the display panel 130, which would cause a flicker of the display screen. In addition, when the size of the liquid crystal display panel 130 is larger, the delay effect of the resistance and capacitance becomes more serious, thereby making the problem of flicker more difficult to solve.

The present invention provides a gamma adjustment circuit that is applied to a display to improve the flicker of a display screen of the display.

The present invention provides a display in which the flicker phenomenon can be improved.

The present invention provides a gamma adjustment circuit in which a gamma adjustment circuit is adapted to be disposed on a printed wiring board. The gamma adjustment circuit includes a plurality of first voltage dividing units, and the first voltage dividing units are serially connected between a first reference voltage and a second reference voltage. In addition, each of the first voltage dividing units includes a first reference resistor and a first impedance adjusting component, wherein the first impedance adjusting component is electrically connected to the first reference resistor. The first impedance adjusting component is configured to adjust an equivalent impedance of the first voltage dividing unit where the first voltage adjusting component is located, and at least one of the first impedance adjusting components is a first adjusting resistor, and the remaining first impedance adjusting components are respectively a first wire.

The present invention provides a display including the aforementioned gamma adjustment circuit, a driving element, and a display panel. The gamma adjustment circuit is adapted to be disposed on a printed circuit board electrically connected to the driving component, and the driving component is electrically connected between the display panel and the gamma adjustment circuit.

In an embodiment of the display and gamma adjustment circuit of the present invention, each A first voltage dividing unit divides the first reference voltage and the second reference voltage to correspondingly output a first gamma reference voltage. In an embodiment, in the at least one first voltage dividing unit including the first adjusting resistor, the node between the first adjusting resistor and the first reference resistor generates a first gamma adjusting voltage.

In an embodiment of the display and gamma adjustment circuit of the present invention, the gamma adjustment circuit further includes a plurality of second voltage dividing units, and the second voltage dividing units are serially connected to the first voltage dividing unit and the second Between the reference voltages. In addition, each of the second voltage dividing units includes a second reference resistor and a second impedance adjusting component, wherein the second impedance adjusting component is electrically connected to the second reference resistor. The second impedance adjusting component is configured to adjust an equivalent impedance of the second voltage dividing unit where the second voltage adjusting component is located, and at least one of the second impedance adjusting components is a second adjusting resistor, and the remaining second impedance adjusting components are respectively a second wire.

In an embodiment of the display and gamma adjustment circuit of the present invention, each of the second voltage dividing units divides the first reference voltage and the second reference voltage to correspondingly output a second gamma reference voltage. In an embodiment, in the at least one second voltage dividing unit including the second adjusting resistor, the node between the second adjusting resistor and the second reference resistor generates a second gamma adjusting voltage.

In an embodiment of the gamma adjustment circuit of the present invention, each of the first voltage dividing units further includes a first voltage stabilizing capacitor, wherein the first voltage stabilizing capacitor is electrically connected to the first gamma reference voltage and the second reference Between voltages.

In an embodiment of the gamma adjustment circuit of the present invention, each of the second voltage dividing units further includes a second voltage stabilizing capacitor, wherein the second voltage stabilizing capacitor is electrically connected to the second gamma reference voltage and the second reference Between voltages.

In an embodiment of the gamma adjustment circuit of the present invention, a printed circuit board The device is electrically connected to a source driving unit, and the source driving unit receives the first gamma reference voltage, the at least one first gamma adjusting voltage, the second gamma reference voltage, and the at least one second gamma adjusting voltage.

In an embodiment of the display of the present invention, the driving component includes a source driving unit, wherein the source driving unit receives the first gamma reference voltage, the at least one first gamma adjustment voltage, the second gamma reference voltage, and at least A second gamma adjustment voltage.

In an embodiment of the display and gamma adjustment circuit of the present invention, the first reference voltage is a system voltage and the second reference voltage is a ground voltage.

Based on the above, the display of the present invention is equipped with the gamma adjustment circuit of the present invention, wherein the gamma adjustment circuit helps to improve the phenomenon that the display panel flickers, thereby improving the display quality of the display.

The above described features and advantages of the present invention will be more apparent from the following description.

It is known from the prior art disclosed in FIG. 1A and FIG. 1B that in the process of transmitting the scan signal in the scan line 132 of the liquid crystal display 100, the pixel regions 130a, 130b at different positions are subjected to a RC delay. The influence thus has unequal value of feed-through voltages ΔV _FTA , ΔV _FTB , such that the common voltage V _comA cannot conform to the pixel region 130b at B or the common voltage V _comB cannot conform to the pixel region ₁₃₀ at A. In addition, the display screen flickers.

In order to improve the above problem, the embodiment adjusts the gamma adjustment circuit. The voltage dividing unit (described in detail later) outputs a gamma adjusting voltage (described in detail later) to a part of the source driving circuit to adjust the data voltages provided by the source driving circuits, thereby adjusting the source driving The pixel voltage in the pixel region electrically connected to the circuit, and reaching the common voltage can substantially match the effect of each pixel region.

2 is a partial equivalent circuit diagram of a gamma adjustment circuit according to an embodiment of the present invention. Referring to FIG. 2, the gamma adjustment circuit 200 of the present embodiment is adapted to be disposed on a printed circuit board (PWB, not shown), wherein the gamma adjustment circuit 200 includes a plurality of voltage dividing units 210a, 210b. , ... and a plurality of voltage dividing units 220a, 220b, .... The voltage dividing units 210a, 210b, ... and the voltage dividing units 220a, 220b, ... are connected in series between a first reference voltage V _REF1 and a second reference voltage V _REF2 , wherein the voltage dividing units 220a, 220b, ... is connected in series between the voltage dividing units 210a, 210b, ... and the second reference voltage V _REF2 .

In this embodiment, the first reference voltage V _REF1 and the second reference voltage V _{REF2 are,} for example, a system voltage and a ground voltage, respectively, and the voltage dividing units 210a, 210b, ... and the voltage dividing units 220a, 220b, ... The first reference voltage V _REF1 and the second reference voltage V _REF2 are jointly divided to further output a gamma reference voltage V _GAMi , where i is an integer greater than or equal to 1. That is, the voltage dividing units 210a, 210b, ... and 220a, 220b, ... are connected in series between the first and second reference voltages V _REF2 and V _REF1 to be located between two adjacent voltage dividing units. The voltage dividing points provide a gamma reference voltage V _{GAMi , respectively} . In the present embodiment, i is a positive integer, for example 1 to 14, which means, the gamma reference voltages embodiment of the present embodiment is a _{V GAM1} ~ V GAM14. However, the present invention is not limited thereto, and the number of gamma reference voltages V _GAMi should be determined depending on the actual product.

In the above, if the voltage value of each gamma reference voltage V _GAMi is to be maintained, a voltage stabilizing capacitor C _R may be further provided in the voltage dividing units 210a, 210b, ... and the voltage dividing units 220a, 220b, . between, wherein the voltage stabilizing capacitor C _R is electrically connected to the gamma reference voltage _V GAMi (e.g. _{V GAM1,} V GAM2, ... or _V GAM14) and a second reference voltage V _REF2.

It should be noted that the source driving circuit in the general display can be electrically connected between the display panel and the gamma adjusting circuit 200 of the embodiment, and the gamma adjusting circuit 200 can provide the gamma reference voltage V _GAMi (for example, V _GAM1 ~V _GAM14 ) to the source driver circuit to enable the source driver circuit to provide the data voltage required by the display panel. In addition, the voltage dividing units 210a, 210b, ... of the present embodiment can provide the horse reference voltage V _GAMi (for example, V _GAM1 ~ V _GAM7 ) required for the positive polarity driving, and the voltage dividing units 220a, 220b, ... A horse reference voltage V _GAMi (for example, V _GAM8 ~ V _GAM14 ) required for negative polarity driving can be provided.

In this embodiment, each of the voltage dividing units 210a, 210b, ... includes a reference resistor 212 and an impedance adjusting component 214 electrically connected to the reference resistor 212, and each voltage dividing unit 220a, 220b, .. A reference resistor 222 and an impedance adjusting component 224 electrically connected to the reference resistor 222 are included. In addition, in this embodiment, at least one of the impedance adjusting components 214 is an adjusting resistor, and the remaining impedance adjusting components 214 are respectively a wire; likewise, at least one of the impedance adjusting components 224 The resistance is adjusted, and the remaining impedance adjusting elements 224 are respectively a wire.

For example, as shown in FIG. 2, the impedance adjusting component 214 in the voltage dividing unit 210b is, for example, an adjustment resistor 214R, and the impedance adjusting component 224 in the voltage dividing unit 220b is, for example, an adjustment resistor 224R, and other impedance adjusting components 214, 224 are, for example, wires 214W, 224W, respectively.

In the present embodiment, the impedance adjusting component 214 is mainly used to adjust the equivalent impedance of the voltage dividing units 210a, 210b, ..., and the impedance adjusting component 224 is mainly used to adjust the voltage dividing unit 220a where it is located. , 220b, ... equivalent impedance. Specifically, in the case where the impedance adjusting element 214 is the voltage dividing unit 210a of the wire 214W, the equivalent impedance value of the voltage dividing unit 210a is substantially the impedance value of the reference resistor 212. On the other hand, in the case where the impedance adjusting element 214 is the voltage dividing unit 210b of the adjusting resistor 214R, the equivalent impedance of the voltage dividing unit 210b can be regarded as an impedance generated by both the reference resistor 212 and the adjusting resistor 214R. Similarly, the equivalent impedance value of the voltage dividing unit 220a is substantially the impedance value of the reference resistor 222, and the equivalent impedance of the voltage dividing unit 220b can be regarded as the impedance generated by both the reference resistor 222 and the adjusting resistor 224R.

Therefore, in the voltage dividing unit 210b, the adjusting resistor 214R can further generate a gamma by the voltage between the adjusting resistor 214R and the reference resistor 212 by dividing the first reference voltage V _REF1 and the second reference voltage V _REF2 . Adjust the voltage V _{GAM_C1} . Similarly, in the voltage dividing unit 220b, the node between the adjustment resistor 224R and the reference resistor 222 can also generate another gamma adjustment voltage V _{GAM_C2} .

It should be noted that, in this embodiment, for example, the adjustment resistors 214R and 224R are disposed in the voltage dividing units 210b and 220b, so that the voltage dividing units 210b and 220b can supply the gamma adjustment voltages V _{GAM_C1} and V _{GAM_C2} . However, the invention is not limited thereto. For example, the configuration of the adjustment resistor can also be configured in another or other plurality of voltage dividing units to enable the other voltage dividing unit or other plurality of voltage dividing units to provide a gamma adjustment voltage.

In particular, the gamma adjustment circuit 200 of the present embodiment is applied to the display, and the gamma adjustment voltages V _{GAM_C1} and V _{GAM_C2} output by the gamma adjustment circuit 200 can be adjusted through the source driving circuit. The data voltage required by the panel, which in turn causes the display screen to flicker, is improved, wherein V _{GAM_C1} and V _{GAM_C2} are gamma adjustment voltages for positive and negative polarity driving, respectively. In the following embodiments, the general structure of the display to which the gamma adjustment circuit 200 of the present embodiment is applied will be first described, and how the gamma adjustment circuit 200 improves the flicker of the display screen will be further discussed.

3 is a partial top plan view of a display according to an embodiment of the present invention. Referring to FIG. 3, the display 500 of the present embodiment includes a gamma adjustment circuit 200, a display panel 300, and a driving component 400. The gamma adjustment circuit 200 is adapted to be disposed on a printed circuit board (not shown) electrically connected to the driving component 400. The driving component 400 is electrically connected between the gamma adjusting circuit 200 and the display panel 300, and is displayed. The panel 300 is, for example, a liquid crystal display panel.

On the other hand, the driving element 400 of the present embodiment includes a source driving circuit 410 and a gate driving circuit 420, and is electrically connected to the above printed wiring board. Furthermore, the source driving circuit 410 of the present embodiment is electrically connected to the printed wiring board and electrically connected to the gamma adjusting circuit 200 disposed on the printed wiring board. Of course, the display 500 of this embodiment can also be repackaged. Contains other components. For example, a transmissive liquid crystal display or a transflective semi-reflective display may further be provided with a backlight module (not shown). In short, FIG. 3 only shows related components to facilitate the description in the following embodiments.

In this embodiment, the display panel 300 includes a plurality of data lines 310a, 310b, ... parallel to each other, a plurality of scanning lines 322, 324, ... and a plurality of pixel regions 330a, 330b. . . , wherein the data lines 310a, 310b, ... and the scan lines 322, 324, ... intersect each other and define pixel regions 330a, 330b, . In addition, the data lines 310a, 310b, ... are electrically connected to the source driving circuit 410, and the scanning lines 322, 324, ... are electrically connected to the gate driving circuit 420.

Further, the source driving circuit 410 of the present embodiment is constituted by, for example, the source driving units 410a, 410b, . More specifically, the source driving unit 410a of the embodiment is electrically connected to the data line 310a, and receives the gamma reference voltage V _GAMi and the gamma adjusting voltages V _{GAM_C1} , V _{GAM_C2} to provide the data voltage required by the pixel region 310a. In addition, the source driving unit 410b of the embodiment is electrically connected to the data line 310b, and receives the gamma reference voltage _VGAMi to provide the data voltage required for the pixel area 310b. However, the configuration relationship of other data lines and source drive units is similar, and will not be repeated here.

4 is a driving waveform diagram of the display panel according to FIG. 3, wherein V _{G is,} for example, a scanning signal provided by the gate driving circuit 420, and V _GA , V _GB are respectively transmitted by the scanning line 322 at two places A and B, respectively. The scanning signals, V _DA and V _{DB are,} for example, data voltages on the data lines 310a and 310b, respectively, and V _PA2 and V _{PB2 are,} for example, pixel voltages in the pixel regions 330a and 330b, respectively.

In the present embodiment, the display 500 is positively driven during the frame time T ₊ and negatively driven during the frame time T ₋ . In detail, during the time t ₁ in the frame time T ₊ , the gate driving circuit 420 supplies the scanning signal V _G to the scanning line 322 in the display panel 300, wherein the scanning signal V _{G is} transmitted to the pixel area 330A at A. The waveform at the time is, for example, the same scanning signal V _GA as the scanning signal V _G , but the waveform transmitted to the pixel region 330 b at B is distorted by the resistance-resistance delay effect to a scanning signal V _{GB which is} greatly different from the scanning signal V _{G .} . Similarly, during the time t ₂ in the frame time T _- , the gate driving circuit 420 also supplies the scanning signal V _G to the scanning line 322, wherein the scanning signal waveform when passing to the pixel region 330A at A is, for example, V _GA However, the scanning signal waveform when passing to the pixel area 330b of B is, for example, the scanning signal V _GB .

In order to improve the pixel-receiving region 330a and the pixel region 330b at the B, respectively, the feed signal _VGA and the scan signal V _GB have different feedthrough effects, and the pixel region 330a and the pixel of the embodiment. The area 330b receives the unequal data voltage V _DA and the data voltage V _DB , respectively, to improve the flicker phenomenon. However, in this embodiment, the gamma reference voltage V _GAMi and the gamma adjustment voltages V _{GAM_C1} , V _{GAM_C2} are supplied through the gamma adjustment circuit 200 to cause the source driving unit 410a to output the data voltage V _DA to the pixel region 330a. The gamma adjustment circuit 200 supplies the gamma reference voltage V _GAMi to cause the source driving unit 410b to output the material voltage V _DB to the pixel region 330b.

It should be noted that the gamma adjustment voltages V _{GAM_C1} and V _{GAM_C2} are formed by adjusting the equivalent impedances in the voltage dividing units 210b and 220b of the gamma adjustment circuit 200, wherein the gamma adjustment voltages V _{GAM_C1} and V _{GAM_C2} can be Effectively improve the flicker of a grayscale tone of the display. However, the present invention does not limit the gamma adjustment voltages V _{GAM_C1} , V _{GAM_C2 to} be generated by the voltage dividing units 210b, 220b, and the designer can visualize the product requirements (such as the highest, lowest gray tone or intermediate gray tone). Correspondingly, the equivalent impedance in the voltage dividing unit is adjusted. The method for adjusting the equivalent impedance in this embodiment is to set the corresponding impedance adjusting component as the adjusting resistor.

Taking the prior art disclosed in FIG. 1 as an example, the feed-through voltages of the pixel regions 130a and 130b at two places A and B are ΔV _FTA and ΔV _{FTB , respectively} . In the present embodiment, for example, the data voltages V _DA and V _DB are supplied in accordance with the feed voltages ΔV _FTA and ΔV _{FTB of the} two unequal values to improve the flicker phenomenon of the display screen.

In detail, the pixel area 330a at A receives the data voltage V _DA on the data line 310a, and the pixel area 330b at the B receives the data voltage V _DB on the data line 310b, wherein the voltage value of the data voltage V _{DA is} , for example, greater than the data. The voltage value of the voltage V _DB , and the voltage difference between the voltage value of the data voltage V _{DA and} the voltage value of the data voltage V _DB is substantially equal to the difference between the feedthrough voltage ΔV _FTA and the feedthrough voltage ΔV _FTB | V _{FTA -ΔV FTB} |.

According to the above, when the time t ₁ ends, the data voltage V _DA is switched from the high level to the low level by the scanning signal V _GA , so that the pixel voltage drops to V _P+ , and the data voltage V _DB is also subjected to the scanning signal V _{GB .} Switching from the high level to the low level causes the pixel voltage to drop to V _P+ . Similarly, when the time t ₂ ends, the data voltage V _DA is switched from the high level to the low level by the scanning signal V _GA , so that the pixel voltage drops to V _P- , and the data voltage V _DB is also subjected to the scanning signal V. The effect of switching the _GB from the high level to the low level causes the pixel voltage to drop to V _P- . In short, in the frame time T ₊ , the pixel regions 330a and 330b have the equivalent pixel voltage V _P+ ; and in the frame time T ₋ , the pixel regions 330a and 330b also have the equivalent pixel. Voltage V _P- .

Then, after time t _1, the pixel region 330a and the pixel region 330b, respectively, although varying degrees of efficiency and thus having different feed-through feed-through voltage △ V _FTA and feed-through voltage △ V _FTB, but pixel regions 330a 330b has the same pixel voltage V _P+ . Similarly, at time t ₂ after the end of pixel regions 330a, 330b have the same pixel voltage V _P-. In this way, the common voltage of the embodiment can be set at an intermediate value V _com between the pixel voltage V _P+ and the pixel voltage V _P− .

As can be seen from the above, the gamma adjustment circuit 200 is used to provide the gamma adjustment voltages V _{GAM_C1} , V _{GAM_C2} to the source driving unit 410a but not to the source driving unit 410b to adjust the data received by the pixel region 310a. The voltage V _DA compensates for the difference between the feedthrough voltages ΔV _FTA and ΔV _FTB , so that the common voltage V _Com can substantially conform to all of the pixel regions 310a, 310b, .

Conventionally, the gamma adjustment circuit can only provide the gamma reference voltage V _GAMi , so that the unequal value of the different pixel regions cannot be compensated, and the display screen flickers.

It should be noted that the above embodiment is that the gamma adjustment circuit 200 provides the gamma adjustment voltages V _{GAM_C1} , V _{GAM_C1} to the source driving unit 410a electrically connected to the pixel region 330a but not to the pixel region. The 330b electrically connected source driving unit 410b is taken as an example, and this method is like increasing the data voltage V _DA of the pixel area 330a without changing the data voltage V _DB of the pixel area 330b | ΔV _FTA - ΔV _FTB |, in turn, causes the pixel regions 330a, 330b to have the same pixel voltages V _P+ , V _P- .

However, in other embodiments, the gamma adjustment circuit 200 can also provide the gamma adjustment voltages V _{GAM_C1} , V _{GAM_C1} to the source driving unit 410b electrically connected to the pixel region 330b but not to the pixel region 330a. The source driving unit 410a is connected to reduce the data voltage V _DB of the pixel area 330b by |ΔV _{FTA -ΔV FTB} | without changing the data voltage V _DA of the pixel area 330a, thereby making the pixel The regions 330a, 330b have the same pixel voltages V _P+ , V _P- .

In a broader sense, when the resistance-capacitance effect in the display panel 300 is very serious, the data voltage of any pixel region can be fixed, and the feedthrough voltage of the pixel region and the feedthrough voltage of other pixel regions can be calculated. The difference. In this way, the data voltages of the other pixel regions can be compensated by the difference so that the common voltages of all the pixel regions in the display panel 300 are substantially the same, thereby improving the flicker of the display screen.

In summary, the gamma adjustment circuit of the present invention is applied to the display of the present invention, wherein the gamma adjustment circuit can effectively improve the flicker phenomenon of the display picture, and the display area with more serious flickering phenomenon can also be utilized in the gamma adjustment circuit. Corresponding adjustment of the impedance adjusting component to adjust the equivalent impedance of the voltage dividing unit to achieve a substantial improvement. Overall, the display of the present invention has good display quality.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art does not deviate. In the spirit and scope of the present invention, the scope of protection of the present invention is defined by the scope of the appended claims.

100‧‧‧LCD display

130‧‧‧LCD panel

130a, 130b‧‧‧ pixel area

131a, 131b‧‧‧ data line

132, 134‧‧‧ scan lines

140‧‧‧Drive components

141‧‧‧Source drive circuit

142‧‧ ‧ gate drive circuit

200‧‧‧Gamma adjustment circuit

210a, 210b, 220a, 220b‧‧‧ partial pressure unit

212, 222‧‧‧ reference resistor

214, 224‧‧‧ impedance adjustment components

214R, 224R‧‧‧ adjustment resistor

214W, 224W‧‧‧ wire

300‧‧‧ display panel

310a, 310b‧‧‧ data line

322, 324‧‧‧ scan lines

330a, 330b‧‧‧ pixel area

400‧‧‧ drive components

410‧‧‧Source drive circuit

420‧‧ ‧ gate drive circuit

500‧‧‧ display

C _R ‧‧‧Stabilized capacitor

t ₁ , t ₂ ‧‧ ‧ time

T ₊ , T _- ‧‧‧ frame time

V _comA , V _{comB ‧‧‧shared} voltage

V _DA , V _DB , V' _D ‧‧‧ data voltage

△V _FTA , △V _FTB ‧‧‧Feed-through voltage

V _G , V _GA , V _GB , V' _G , V' _GA , V' _GB ‧‧‧ scan signal

V _GAM1 ~V _GAM14 , V _GAMi ‧‧‧ gamma reference voltage

V _{GAM_C1} , V _{GAM_C2} ‧‧‧ gamma adjustment voltage

V _PA1 , V _PB1 , V _PA2 , V _PB2 , V _P+ , V _P- ‧ ‧ pixel voltage

V _PA+ , V _PA- , V _PB+ , V _PB- ‧‧‧ pixel voltage

V _REF1 ‧‧‧First reference voltage

V _REF2 ‧‧‧second reference voltage

FIG. 1A is a partial top view of a conventional liquid crystal display.

Fig. 1B is a driving waveform diagram of the liquid crystal display panel according to 1A of the drawing.

2 is a partial equivalent circuit diagram of a gamma adjustment circuit according to an embodiment of the present invention.

3 is a partial top plan view of a display according to an embodiment of the present invention.

4 is a diagram showing driving waveforms of a display panel according to an embodiment of the present invention.

200‧‧‧Gamma adjustment circuit

210a, 210b, 220a, 220b‧‧‧ partial pressure unit

212, 222‧‧‧ reference resistor

214, 224‧‧‧ impedance adjustment components

214R, 224R‧‧‧ adjustment resistor

214W, 224W‧‧‧ wire

C _R ‧‧‧Stabilized capacitor

V _GAM1 ~V _GAM14 , V _GAMi ‧‧‧ gamma reference voltage

V _{GAM_C1} , V _{GAM_C2} ‧‧‧ gamma adjustment voltage

V _REF1 ‧‧‧First reference voltage

V _REF2 ‧‧‧second reference voltage

Claims (19)

A gamma adjustment circuit is disposed on a printed circuit board. The gamma adjustment circuit includes: a plurality of first voltage dividing units connected in series between a first reference voltage and a second reference voltage, each The first voltage dividing unit includes: a first reference resistor; and a first impedance adjusting component electrically connected to one end of the first reference resistor for adjusting an equivalent impedance of the first voltage dividing unit where the first voltage dividing unit is located; And a first voltage stabilizing capacitor electrically connected between the other end of the first reference resistor and the second reference voltage, wherein at least one of the first impedance adjusting components is a first adjusting resistor, and the rest The first impedance adjusting components are respectively a first wire. The gamma adjustment circuit of claim 1, wherein each of the first voltage dividing units divides the first reference voltage and the second reference voltage to correspondingly output a first gamma reference voltage. The gamma adjustment circuit of claim 2, wherein in the at least one first voltage dividing unit including the first adjusting resistor, a node between the first adjusting resistor and the first reference resistor is generated A first gamma adjustment voltage. The gamma adjustment circuit of claim 3, wherein the printed circuit board is adapted to be electrically connected to a source driving unit, and the source driving unit receives the first gamma reference voltage and the at least one One gamma The whole voltage. The gamma adjustment circuit of claim 1, further comprising: a plurality of second voltage dividing units connected in series between the first voltage dividing units and the second reference voltage, each of the second The voltage dividing unit includes: a second reference resistor; and a second impedance adjusting component electrically connected to the second reference resistor for adjusting an equivalent impedance of the second voltage dividing unit where the second voltage dividing unit is located, wherein the At least one of the two impedance adjusting components is a second adjusting resistor, and the remaining second impedance adjusting components are respectively a second wire. The gamma adjustment circuit of claim 5, wherein each of the second voltage dividing units divides the first reference voltage and the second reference voltage to output a second gamma reference voltage. The gamma adjustment circuit of claim 6, wherein in the at least one second voltage dividing unit including the second adjustment resistor, a node between the second adjustment resistor and the second reference resistor is generated A second gamma adjustment voltage. The gamma adjustment circuit of claim 7, wherein the printed circuit board is adapted to be electrically connected to a source driving unit, and the source driving unit receives the second gamma reference voltage and the at least one Two gamma adjustment voltage. The gamma adjustment circuit of claim 6, wherein each of the second voltage dividing units further comprises: A second voltage stabilizing capacitor is electrically connected between the second gamma reference voltage and the second reference voltage. The gamma adjustment circuit of claim 1, wherein the first reference voltage is a system voltage, and the second reference voltage is a ground voltage. A display comprising: a gamma adjustment circuit, configured to be disposed on a printed circuit board, the gamma adjustment circuit comprising: a plurality of first voltage dividing units connected in series to a first reference voltage and a second reference voltage Each of the first voltage dividing units includes: a first reference resistor; a first impedance adjusting component electrically connected to one end of the first reference resistor for adjusting the first voltage dividing unit And a first voltage stabilizing capacitor electrically connected between the other end of the first reference resistor and the second reference voltage, wherein at least one of the first impedance adjusting components is a first An adjustment resistor, the remaining first impedance adjusting components are respectively a first wire; a driving component electrically connected to the printed circuit board; and a display panel electrically connected to the display panel and the gamma Ma adjusts between circuits. The display device of claim 11, wherein each of the first voltage dividing units divides the first reference voltage and the second reference voltage to output a first gamma reference voltage. The display of claim 12, wherein in the at least one first voltage dividing unit including the first adjusting resistor, the node between the first adjusting resistor and the first reference resistor generates a first Gamma adjusts the voltage. The display device of claim 13, wherein the driving component comprises a source driving unit, and the source driving unit receives the first gamma reference voltage and the at least one first gamma adjustment voltage. The display device of claim 11, wherein the gamma adjustment circuit further comprises: a plurality of second voltage dividing units connected in series between the first voltage dividing units and the second reference voltage, each The second voltage dividing unit includes: a second reference resistor; and a second impedance adjusting component electrically connected to the second reference resistor for adjusting an equivalent impedance of the second voltage dividing unit where the second voltage dividing unit is located, wherein At least one of the second impedance adjusting components is a second adjusting resistor, and the remaining second impedance adjusting components are respectively a second wire. The display of claim 15, wherein each of the second voltage dividing units divides the first reference voltage and the second reference voltage to output a second gamma reference voltage. The display device of claim 16, wherein in the at least one second voltage dividing unit including the second adjusting resistor, the node between the second adjusting resistor and the second reference resistor generates a second Gamma adjusts the voltage. The display device of claim 17, wherein the driving component comprises a source driving unit, and the source driving unit receives the second gamma reference voltage and the at least one second gamma adjustment voltage. The display of claim 11, wherein the first reference voltage is a system voltage and the second reference voltage is a ground voltage.