KR101510880B1 - Data modulation device, data modulation method, organic electro-luminescent display device, and method of the same - Google Patents

Abstract

A data modulation device, a data modulation method, and an organic light emitting display device and a driving method thereof are disclosed.

The present invention reflects first to third gray weights having different gray values for each of the red, green, and blue first gray data to output red, green, and blue second gray data, Green and blue data voltages according to the blue second gray data to the red, green and blue light emitting layers of the organic light emitting display panel. Since the luminous efficiency of each light emitting layer can be made uniform, a single gamma can be used, simplifying the circuit configuration and reducing the number of gamma lines, thereby reducing the cost.

Organic light emitting display, luminescence efficiency, gray weight, data modulation, gamma

Description

TECHNICAL FIELD [0001] The present invention relates to a data modulation device, a data modulation method, and an organic light emitting display device,

The present invention relates to data modulation, and more particularly, to a data modulation device, a data modulation method, and an organic light emitting display device and a driving method thereof.

Due to the development of the information society, display devices capable of displaying information are actively being developed. The display device includes a liquid crystal display device, an organic electro-luminescence display device, a plasma display panel, and a field emission display device.

In particular, an organic light emitting display device is a self-light emitting type, and a backlight light source such as a liquid crystal display device is not required, so that the organic light emitting display device can be manufactured in a light and thin shape as well as a simple process. Further, organic electroluminescent display devices are rapidly advancing as next-generation displays as they have low-voltage driving, high luminous efficiency, and wide viewing angles.

The organic electroluminescent display includes an array substrate and an encapsulating substrate bonded to the array substrate using a sealing member to protect the organic EL device of the array substrate.

The array substrate is provided with a red light emitting layer, a green light emitting layer and a blue light emitting layer for emitting red, green and blue light.

The red, green and blue light emitting layers are made of an organic material, and the luminous efficiency differs depending on the type of the organic material.

To date, the luminous efficiencies of the green, red and blue luminescent layers have a ratio of 4: 2: 1. Therefore, the luminous efficiency of the blue light emitting layer is about four times lower than that of the green light emitting layer.

As described above, since the luminous efficiencies of the respective light emitting layers are different from each other, a uniform luminous efficiency can not be obtained.

In order to solve this problem, as shown in FIG. 1, different gamma values are used for red, green, and blue, respectively, so that the respective luminous efficiencies of red, green, and blue are uniform. That is, a red gamma value for the red light emitting layer, a green gamma value for the green light emitting layer, and a blue gamma value for the blue light emitting layer are set, and the red data voltage is provided to the red light emitting layer by the red gamma value, Is provided as a green light emitting layer, and a blue data voltage is provided by a blue gamma value. As shown in Fig. 1,

Therefore, by using different gamma values for each of red, green and blue, uniform luminous efficiency can be obtained.

However, in order to use three different gamma values as described above, since the three gamma values must be separately generated, the circuit configuration becomes complicated, and three gamma signal lines are required to supply three gamma values, which complicates the line structure There is a problem that the process cost is increased.

The present invention relates to a data modulation device, a method, and a data modulation method that can simplify a circuit configuration, simplify a line structure, and reduce a cost by using only one gamma value for red, green, and blue instead of modulating red, And an object thereof is to provide a light emitting display and a driving method thereof.

According to the first embodiment of the present invention, the data modulating apparatus includes first to third gray weights having different gray values for each of the red, green and blue first gray data, And a gray modulation section for outputting 2 gray data.

According to a second embodiment of the present invention, there is provided a data modulation method comprising: inputting red, green and blue first gray data; Reflecting each of the predetermined first to third weights to the red, green, and blue first gray data; And adjusting the number of bits of each of the red, green, and blue first gray data to output red, green, and blue second gray data.

According to a third embodiment of the present invention, an organic light emitting diode display panel includes red, green, and blue light emitting layers formed in pixel regions defined by a plurality of gate lines and a plurality of data lines, respectively. A gray modulation unit for outputting red, green, and blue second gray data by reflecting first to third gray weights having different gray values for each of red, green, and blue first gray data; A gate driver for supplying a scan signal to each of the gate lines; And a data driver for supplying red, green and blue data voltages corresponding to each of the red, green and blue second gray data to the red, green and blue light emitting layers.

According to a fourth aspect of the present invention, there is provided a method of driving an organic light emitting display, the method including driving red, green, and blue first gray data, each of which has a gray value different from the first gray data, Green and blue second gray data; Supplying a scan signal to each of the gate lines of the organic light emitting display panel; And supplying red, green, and blue data voltages corresponding to each of the red, green, and blue second gray data to the red, green, and blue light emitting layers of the organic light emitting display panel.

According to the present invention, the gray level of gray data for supplying the light emitting layer with poor light emitting efficiency can be increased, and the light emitting efficiency of the red, green, and blue light emitting layers can be maintained constant.

In addition, since the present invention can use a single gamma by adjusting the gray level of the gray data in this way, the configuration of the gamma circuit can be simplified, and the gamma signal lines can be reduced to simplify the line structure and reduce the cost.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 2 is a block diagram illustrating a data modulation apparatus according to an embodiment of the present invention, and FIG. 3 is a detailed block diagram of the gray modulation unit of FIG.

2 and 3, the data modulator includes red, green and blue output gray data (R ", G", B ") of red, green and blue input gray data (R, And a memory 20 in which gray weights m_r, m_g and m_b for gray modulation and scale weights s_r, s_g and s_b for scale modulation are stored.

In the memory 20, the gray weights m_r, m_g and m_b are individually set for red, green and blue, and the scale weights s_r, s_g and s_b are set individually for red, green and blue have.

The gray weights m_r, m_g, m_b may be set to different values for the same gray levels of red, green, and blue. Generally, the green light emitting layer of the organic light emitting display device has the highest luminous efficiency, the red light emitting layer has the next highest luminous efficiency, and the blue light emitting layer has the lowest luminous efficiency. Therefore, if the gray levels of red, green and blue are the same, the gray weights can be set to increase in the order of green input gray data G, red input gray data R and blue input gray data B ( m_g -> m_r -> m_b).

For example, the green gray weight (m_g) is 0, the red gray weight (m_r) is 5 and the blue gray weight (m_g) is 0 for the red, green and blue input gray data (R, G, B) And the weight m_b may be set to 10, respectively. Thus, the green input gray data G can be output as green output gray data G "having a green gray level of 200 since the green gray weight m_g is 0. The red input gray data R Since the red gray weight (m_r) is 5, red output gray data (R ") having a red gray level of 205 can be output. Further, the blue input gray data B has a blue gray weight (m_b) of 10, so that blue output gray data B having 210 blue gray levels can be output.

Therefore, the memory 20 stores red, green, and blue weights m_r, green, and blue that are different from each other for the red, green, and blue input gray data (R, G, B) having the same gray level, m_g, m_b) are set. Each of the red, green, and blue gray weights m_r, m_g, and m_b may be set so that each gray level and gray weights correspond to 1: 1 from 0 gray level to 255 gray levels. Alternatively, the red, green, and blue gray weights may be set to one weight, with a plurality of gray levels as a bundle. For example, one gray weight may be set for 0 gray levels to 10 gray levels for blue, and another gray weight for 11 gray levels to 15 gray levels.

These gray weights m_r, m_g, and m_b may be set to values optimized through experimentation.

The scale weights s_r, s-g, s_b are for adjusting the number of output bits of gray data, and the scale weights s_r, s-g, s_b may be adjusted by the user if necessary. The input gray data R, G and B normally have 8 bits, and the output gray data R ", G ", " ', B' ').

The scale weights s_r, s-g, s_b may or may not apply equally to the red, green and blue input gray data R, G, B.

According to the present invention, since the green gray weight m_g is most likely to be set to 0, it is unlikely that the number of digits of the green output gray data G "for the green input gray data G is likely to change, Since the red gray weight m_r and the blue gray weight m_b have at least five gray levels, the red output gray data R for the red input gray data R and the blue output gray data R for the blue input gray data B, The green scale weight s_g can be set to zero, the red color weight s_r is set to 1, the blue color weight s_b is set to 1, Quot; 1 "means a weight for adjusting the number of bits to 12, and" 2 "is a number of 16 bits Weights for adjustment are It is only one example, and many changes will be possible in actual application.

The gray modulation unit 10 includes red, green, and blue gray weights m_r, m_g, and m_b provided from the memory 20 for each of the red, green, and blue input gray data R, G, Green and blue input gray data (R ', G', B ') in which the red, green and blue gray weights m_r, m_g and m_b are reflected, Green and blue output gray data (R ", G", B ") reflecting the red, green and blue scale weights s_r, s_g and s_b provided from the memory 20 14).

The gray correction unit 12 includes a red gray correction unit 12a, a green gray correction unit 12b and a blue gray correction unit 12c.

The red gray correction unit 12a checks the red gray level of the red input gray data R and receives the red gray weight m_r set for the identified red gray level from the memory, (m_r) to the red input gray data (R). For example, when the red gray weight (m_r) set in the memory 20 is 5 for the red input gray data R having 200 red gray levels, the red gray correction unit 12a is set to 205 red gray level The corrected red input gray data R 'may be output.

The green gray correction unit 12b checks the green gray level of the green input gray data G and receives the green gray weight m_g set for the determined green gray level from the memory 20, And reflects the green gray weight (m_g) on the green input gray data (G). For example, when the green gray weight value (m_g) set in the memory 20 for the green input gray data G having 200 green gray levels is 0, the green gray correction unit 12b receives 200 green gray levels Green < / RTI > input gray data G 'may be output.

The blue gray correction unit 12c confirms the blue gray level of the blue input gray data B and receives the blue gray weight m_b set for the identified blue gray level from the memory 20, And reflects the blue gray weight (m_b) on the blue input gray data (B). For example, when the blue gray weight (m_b) set in the memory 20 is 10 for the blue input gray data B having 200 blue gray levels, the blue gray correction unit 12c is shifted from the blue gray correction unit 12c to 210 blue gray level The corrected blue input gray data B 'can be output.

The scale correcting unit 14 includes a red scale correcting unit 14a, a green scale correcting unit 14b and a blue scale correcting unit 14c.

Green, and blue input gray data (R ', G', B ') in which the red, green, and blue gray weights m_r, m_g, and m_b are respectively reflected are input to the scale adjustment unit 14. That is, the red input gray data R 'reflecting the red gray weight m_r is input to the red color correction unit 14a, and the green input gray data G' reflecting the green gray weight m_r is input to the green The blue input gray data B 'input to the scale correction unit 14b and reflecting the blue gray weight m_b is input to the blue scale correction unit 14c.

The red, green and blue scale weights s_r, s_g, s_b may have the same value.

The red scale correcting unit 14a adjusts the number of bits of the red input gray data R 'according to the red scale weight s_r provided from the memory 20. For example, when the red scale weight s_r is 1, the red gray correction unit 14a can adjust the number of bits of the red input gray data R 'to 12.

The green scale correction unit 14b adjusts the number of bits of the green input gray data G 'according to the green scale weight s_g provided from the memory 20. [ For example, when the green scale weight s_g is 1, the green gray correction section 14b can adjust the non-pitch of the green input gray data G 'to 12.

The blue scale correction unit 14c adjusts the number of bits of the blue input gray data B 'according to the blue scale weight s_b provided from the memory 20. [ For example, when the blue scale weight s_b is 1, the blue gray correction unit can adjust the number of bits of the blue input gray data B 'to 12.

Accordingly, the red gray weight (m_r) and the red color weight (s_r) are reflected on the red input gray data R by the gray converter 10 to output the red output gray data R " The green gray weight m_g and the green scale weight s_g are reflected in the data G to output the green output gray data G ", and the blue gray weight m_b and the blue gray weight m_b are added to the blue input gray data B, The weight sb may be reflected and the blue output gray data B "may be output.

4 is a block diagram illustrating an OLED display including the gray modulation unit of FIG.

Referring to FIG. 4, the OLED display includes an OLED display panel 80, a gate driver 50, a data driver 60, a gamma generator 70, and a timing controller 30. In addition, the organic light emitting display may further include a memory 20 for providing gray weights and scale weights to the timing controller 30.

The organic light emitting display panel 80 includes a plurality of gate lines and a plurality of data lines crossing each other. A pixel region can be defined by the intersection of each gate line and each data line.

A thin film transistor is connected to each gate line and each data line. Further, the light emitting diodes are arranged to be connected to the respective thin film transistors. The light emitting diode may include a red light emitting diode, a green light emitting diode, and a blue light emitting diode.

The light emitting diode may include a first electrode, a light emitting layer, and a second electrode. The first electrode may be connected to the thin film transistor. The second electrode may be a common electrode and may be formed in common to red, green, and blue light emitting diodes. The light emitting layer may include a red light emitting layer made of a red organic material, a green light emitting layer made of a green organic material, and a blue light emitting layer made of a blue organic material for each pixel region.

The luminous efficiency of each of the red light emitting layer, the green light emitting layer and the blue light emitting layer can be uniquely determined according to the material used for each light emitting layer. Generally, the luminous efficiency of the green luminous layer is superior to that of the red luminous layer, and the luminous efficiency of the red luminous layer is superior to that of the blue luminous layer.

Therefore, when the red, green, and blue data voltages for the same gray are supplied to the red, green, and blue light emitting layers according to a single gamma value, the light emitting efficiencies of the red, green, and blue light emitting layers become different from each other. Therefore, the luminous efficiencies of the red, green and blue light emitting layers are not the same for the same gray, so that it is difficult to realize a desired color.

In order to solve this problem, the present invention modulates red, green and blue input gray data (R, G, B) to obtain red, green and blue having the same luminous efficiency even using a single gamma value. This will be described later in detail.

The gate driver 50 sequentially supplies a scan signal to each gate line of the organic light emitting display panel 80 in response to a first control signal provided from the timing controller 30.

The gamma generating unit 70 generates a gamma value for generating red, green, and blue data voltages supplied from the data driver 60 to the organic light emitting display panel 80. The gamma generation unit 70 generates a plurality of gamma values (reference voltages) and supplies the generated gamma values to the data driver 60. As shown in FIG. 6, may have a linear single gamma curve. This single gamma curve can be equally applied to red, green and blue data.

The data driver 60 generates a gamma value corresponding to the output gray data R ", G", B "supplied from the timing controller 30 based on the plurality of gamma values supplied from the gamma generator 70, , Green, and blue data voltages to the organic light emitting display panel (80).

The timing controller 30 may include a gray modulation unit 10. The timing controller 30 generates the first control signal for driving the gate driver 50 and the second control signal for driving the data driver 60. Since generation of the first and second control signals is well known in the art, further explanation is omitted.

The gray modulation unit 10 outputs red output gray data R "by reflecting the red gray weight m_r and the red scale weight s_r to the red input gray data R and outputs the green input gray data G Green gray weight m_b and green scale weight s_g to blue input gray data B and blue gray weight m_b to blue input gray data B to reflect green gray weight m_g and green scale weight s_g, ) To output blue output gray data B ".

Since the gray modulation section 10 has been described in detail above (see FIGS. 2 and 3), further detailed description is omitted.

Therefore, according to the OLED display device, the red, green, and blue input gray data R, G, and B are modulated by the gray modulation unit 10 of the timing controller 30 so that the gray weights m_r, green and blue output gray data (R ", G", B ") reflecting the scale weights s_r, s_g and s_b are output from the data driver 60, Green, and blue data corresponding to the red, green, and blue output gray data R ", G", B "are generated based on the plurality of gamma values supplied from the generator 70, (80). ≪ / RTI >

For example, if the red, green and blue input gray data (R, G, B) have the same gray level of 200, the red, green and blue input gray data R, G and B are each modulated to produce red output gray data (R ") with 205 red gray levels, green output gray data (G") with 200 green gray levels and blue output gray And data B "is supplied to the data driver 60. [

The data driver 60 generates a red data voltage of 3V corresponding to red output gray data (R ") having 210 red gray levels based on the plurality of gamma values supplied from the gamma generator 70, And a blue data voltage of 3.3 V corresponding to blue output gray data B "having 210 blue gray levels, corresponding to green output gray data G" 80).

Therefore, a red data voltage of 3V is supplied to the red light emitting layer of the organic light emitting display panel 80, a green data voltage of 2.7V is supplied to the green light emitting layer, and a blue data voltage of 3.3V is supplied to the blue light emitting layer. Accordingly, the relatively high data voltages are supplied to the red and blue light emitting layers having poorer luminous efficiency than the green light emitting layer having excellent light emitting efficiency, so that the luminous efficiency of the red, green, and blue light emitting layers can be maintained constant.

Therefore, by supplying red, green, and blue data that are different from each other to red, green, and blue input gray data (R, G, B) of the same gray level to red, green, and blue light- Emitting efficiency of the light-emitting layers can be maintained uniformly.

Figure 1 shows the red, green and blue gamma curves used in the prior art.

2 is a diagram illustrating a data modulation apparatus according to an embodiment of the present invention.

3 is a block diagram showing the gray modulation unit of FIG. 2 in detail;

FIG. 4 is a block diagram showing an organic light emitting display including the gray modulation unit of FIG. 2;

Figure 5 shows the red, green and blue gray modulation curves used in the present invention.

6 shows a gamma curve used in the present invention.

Description of the Related Art

10: Gray modulation section 12: Gray correction section

14: scale correcting unit 20: memory

30: timing controller 50: gate driver

60: Data driver 70: Gamma generator

80: organic light emitting display panel

Claims (9)

A gray correction unit for outputting red, green and blue second gray data by adding first to third gray weights different from each other for each of red, green and blue first gray data; And And a scale corrector for outputting third gray data of red, green and blue by adding first through third bit number weights different from each other for each of red, green and blue second gray data outputted from the gray correction unit, The red, green, and blue third gray data output from the scale correcting unit are generated with red, green, and blue data voltages by reflecting the same gamma curve, Wherein the third gray weight is greater than the first gray weight and the first gray weight is greater than the second gray weight. delete 2. The method of claim 1, wherein the first gray weight is added to the gray level of the red first gray data, the second gray weight is added to the gray level of the green first gray data, Wherein the gray level of the blue first gray data is added to the gray level of the blue first gray data. delete Receiving first red, green, and blue first gray data; Outputting red, green and blue second gray data by adding first to third gray weights different from each other for each of the red, green and blue first gray data; And Green, and blue third gray data by adding first to third bit number weights that are different from each other for each of the red, green, and blue second gray data, The output red, green, and blue third gray data are generated with red, green, and blue data voltages that reflect the same gamma curve, Wherein the third gray weight is greater than the first gray weight and the first gray weight is greater than the second gray weight. 6. The method of claim 5, wherein the first gray weight is added to the gray level of the red first gray data, the second gray weight is added to the gray level of the green first gray data, To the gray level of the blue first gray data. An organic light emitting display panel in which red, green, and blue light emitting layers are formed in each pixel region defined by a plurality of gate lines and a plurality of data lines; A gray correction unit for outputting red, green and blue second gray data by adding first to third gray weights different from each other for each of red, green and blue first gray data; A scale corrector for outputting third gray data of red, green and blue by adding first to third bit number weights different from each other for each of red, green and blue second gray data outputted from the gray correction unit; A gate driver for supplying a scan signal to each of the gate lines; And And a data driver for supplying red, green and blue data voltages corresponding to each of the red, green and blue second gray data to the red, green and blue light emitting layers, The output red, green, and blue third gray data are generated with the red, green, and blue data voltages by reflecting the same gamma curve, Wherein the third gray weight is greater than the first gray weight and the first gray weight is greater than the second gray weight. 8. The OLED display of claim 7, further comprising a gamma generator for generating a plurality of gamma values for generating the red, green, and blue data voltages. Outputting red, green and blue second gray data by adding first to third gray weights different from each other for each of red, green and blue first gray data; Adding the first to third bit number weights for the red, green and blue second gray data to each other to output red, green and blue third gray data; Supplying a scan signal to each of the gate lines of the organic light emitting display panel; And And supplying red, green, and blue data voltages corresponding to each of the red, green, and blue second gray data to the red, green, and blue light emitting layers of the organic light emitting display panel, The output red, green, and blue third gray data are generated with the red, green, and blue data voltages by reflecting the same gamma curve, Wherein the third gray weight is greater than the first gray weight and the first gray weight is greater than the second gray weight.

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