Display Panel Pixel Circuit Grayscale Accuracy
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Solution Overview
Problem
Existing display panel technologies face challenges with grayscale accuracy due to the 'grayscale missing' problem, where the active driving method used in most display panels is prone to inaccuracies in controlling light-emitting devices, leading to suboptimal picture quality.
Innovation Solution
The display panel incorporates a pixel circuit with a driving module, data writing module, and light-emitting control module, operating in multiple modes (Pulse Amplitude Modulation (PAM) and Pulse Width Modulation (PWM) to precisely control the driving current to light-emitting devices, allowing for flexible and accurate brightness adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If active driving method with transistor-based pixel circuit is used, then the display panel can be driven efficiently, but grayscale accuracy deteriorates due to grayscale missing problem
Solution Approach 1:
The patent applies dynamics by making the pixel circuit operate in multiple working modes (first working mode with data writing module active, second working mode with light-emitting control module active) rather than a single static mode. This dynamic switching enables the circuit to adapt between efficient driving and precise grayscale control, resolving the contradiction between driving efficiency and grayscale accuracy.
Solution Approach 2:
The patent changes operational parameters by transmitting different data voltages in different working modes and controlling different durations of light emission. By varying voltage levels and time durations, the system achieves both efficient driving and precise grayscale representation, overcoming the grayscale missing problem while maintaining driving efficiency.
2Device complexity
If single working mode is used for simplicity, then device complexity is reduced, but grayscale representation capability deteriorates
Solution Approach 1:
The patent implements multi-functionality by designing the pixel circuit to perform multiple functions through different working modes: data writing function in the first working mode and light-emitting control function in the second working mode. This universal design enables the same circuit structure to achieve both efficient driving and accurate grayscale representation without requiring separate circuits for each function.
Solution Approach 2:
The patent applies periodic action by alternating between first working modes and second working modes in a cyclic manner. This periodic switching between different operational states enables the circuit to achieve comprehensive grayscale representation capability while maintaining manageable complexity through structured, repeating operation patterns.
Data Source
AI summary
A display panel includes light-emitting devices and pixel circuits. The pixel circuit includes a driving module, a data writing module, and a light-emitting control module. In an embodiment, the pixel circuit comprises first working modes and second working modes. In an embodiment, the data writing module transmits different data voltages to the driving module in at least two of the first working modes. The data writing module transmits a same data voltage to the driving module in any one of the second working modes. Durations taken by the light-emitting control module to control the driving module to transmit a driving current to the light-emitting device in any one of the first working modes are the same. Durations taken by the light-emitting control module to control the driving module to transmit a driving current to the light-emitting device in at least two of the second working modes are different.