Display Driving Circuit Brightness Uniformity Feedback Control
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Solution Overview
Problem
OLED display apparatuses face issues with non-uniform brightness due to varying threshold voltages of transistors across different pixel units, which cannot be fully resolved by compensating for current flow, leading to differences in light emitting efficiency and display brightness.
Innovation Solution
A display driving circuit comprising a control unit, a light emitting device, and a collection unit, where the collection unit collects brightness data and feeds it to the control unit to adjust the actual light emitting brightness to a target value, ensuring uniformity across pixel units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If current compensation is applied to address transistor threshold voltage variations, then the brightness uniformity is partially improved, but the problem cannot be completely solved due to differences in light emitting efficiency among OLED devices
Solution Approach 1:
The patent implements a feedback mechanism where the collection unit measures the actual brightness of each pixel and feeds this information back to the control unit. The control unit then adjusts the driving current for each pixel based on the measured brightness and the target brightness value, creating a closed-loop control system that compensates for both transistor threshold voltage variations and OLED light emitting efficiency differences.
Solution Approach 2:
Each pixel unit performs self-diagnosis and self-adjustment through the collection unit measuring its own brightness and the control unit adjusting its driving current accordingly. This allows each pixel to compensate for its own characteristics without requiring external calibration, achieving automated brightness uniformity across the entire display.
2Manufacturing precision
If a collection unit and control mechanism are added to each pixel unit, then brightness uniformity is improved, but the device complexity increases
Solution Approach 1:
The patent merges the collection unit and control unit functions directly into the existing pixel unit structure. The collection unit is integrated with the OLED device, and the control unit is embedded within the pixel circuit, sharing common components such as transistors and capacitors. This integration approach minimizes additional complexity while achieving brightness uniformity.
Solution Approach 2:
The control unit performs multiple functions: it receives target brightness values, processes collection results from the collection unit, calculates compensation values, and adjusts driving currents. This multi-functional design reduces the need for separate dedicated circuits for each function, thereby limiting the increase in device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables real-time adjustment of light emitting brightness, ensuring uniform brightness across all pixel units, thereby enhancing the display's overall performance and consistency.
Implementation Method 1
the collection unit is configured to collect brightness of the light emitting device according to a signal input from the collection signal input terminal
Data Source
AI summary
Disclosed are a display driving circuit and a driving method thereof, and a display apparatus. The display driving circuit comprises a control unit (13), a light emitting device (20) and a collection unit (21). The collection unit (21) is connected with one terminal of the light emitting device (20), the control unit (13) and a collection signal input terminal (Fn) respectively, and is configured to collect brightness of the light emitting device (20) according to a signal input from the collection signal input terminal (Fn) and feed a collection result to the control unit (13); the control unit (13) is connected with the one terminal of the light emitting device (20) and the collection unit (21) respectively, and is configured to adjust an actual light emitting brightness value (L) of the light emitting device (20) to a target brightness value (D) according to the collection result; and the other terminal of the light emitting device (20) is connected with a first voltage (VSS), and is configured to emit light under the control of the control unit (13). The display driving circuit can bring uniformity of brightness in light emitted from respective pixel units.